Name the element in the fourth period of the periodic table with:
(a) 5 valence electrons
(b) a total of four 4p electrons
(c) a total of three 3d electrons
(d) a complete outer shell

Answers

Answer 1

(a) 5 valence electrons - Nitrogen

(b) a total of four 4p electrons - Sulfur

(c) a total of three 3d electrons - Scandium

(d) a complete outer shell - Argon

(a) The element in the fourth period of the periodic table with 5 valence electrons is nitrogen (N). Nitrogen is located in Group 15, so it has 5 valence electrons in its outermost energy level.

(b) The element in the fourth period of the periodic table with a total of four 4p electrons is sulfur (S). Sulfur is located in Group 16, and its electron configuration is [Ne] 3s² 3p⁴. In the fourth period, the 4p sublevel can accommodate up to 6 electrons, but sulfur has only four electrons in its 4p orbital.

(c) The element in the fourth period of the periodic table with a total of three 3d electrons is scandium (Sc). Scandium is located in Group 3, and its electron configuration is [Ar] 3d¹ 4s². In the fourth period, the 3d sublevel starts to fill with electrons, and scandium has three electrons in its 3d orbital.

(d) The element in the fourth period of the periodic table with a complete outer shell is argon (Ar). Argon is located in Group 18 (noble gases), and its electron configuration is [Ne] 3s² 3p⁶. It has a complete outer shell with a total of 8 valence electrons, making it stable and unreactive.

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Related Questions

A solution contains dissolved NaIO3. What is the concentration of NaIO3 if adding excess Pb(IO3)2 (s) produces [Pb2+] = 8.50 x 10-6M?
I found the [IO3-] = 1.72 x 10-4
Ksp of Pb(IO3)2 = 2.5 x 10-13
How do I calculate [NaIO3]?

Answers

The concentration of [NaIO₃] if adding excess Pb(IO₃)₂ (s) produces [Pb²⁺] = 8.50 x 10⁻⁶ M is 3.7 × 10⁻² M.

To determine the concentration of NaIO₃ when excess Pb(IO₃)₂ (s) is added to a solution containing dissolved NaIO₃ and [Pb²⁺] = 8.50 × 10⁻⁶ M, we can use the following steps:

Step 1: Write the balanced chemical equation for the reaction between NaIO₃ and Pb(IO₃)₂:

Pb(IO₃)₂(s) → Pb²⁺(aq) + 2IO₃⁻(aq)

Step 2: Write the Ksp expression for Pb(IO₃)₂ using the balanced equation and given values:

Ksp = [Pb²⁺][IO₃⁻]2

= (8.50 × 10⁻⁶)(2 × 1.72 × 10⁻⁴)2

Ksp = 5.8 × 10⁻¹¹

Step 3: Write the expression for [IO₃⁻] in terms of [NaIO₃] and Ksp of Pb(IO₃)₂:

[IO₃⁻] = (2Ksp/[NaIO₃])1/2[NaIO₃]

= 2Ksp/[IO₃⁻]2[NaIO₃]

= 2(2.5 × 10⁻¹³)/(2 × 1.72 × 10⁻⁴)2[NaIO₃]

= 3.7 × 10⁻² M

Therefore, the concentration of NaIO₃ is 3.7 × 10⁻² M.

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The result is negative, which means that there is no NaIO3 in the solution. This is because all the NaIO3 has reacted with Pb(IO3)2 to form Pb2+ and IO3-. Therefore, the concentration of NaIO3 is 0 M.

The [NaIO3] can be calculated using the given information and the Ksp of Pb(IO3)2.

Here are the steps to calculate the concentration of NaIO3 in the solution:

Step 1: Write the balanced chemical equation for the reaction.

2Pb(IO3)2 (s) → 2Pb2+(aq) + 4IO3-(aq)

Step 2: Calculate the molar solubility of Pb(IO3)2 using the Ksp value and the formula.

Ksp = [Pb2+]2[IO3-]4

Let x be the molar solubility of Pb(IO3)2, then:

2.5 × 10-13 = x2(4x)4x3 = 6.25 × 10-14x = 6.3 × 10-5 M

Step 3: Determine the excess concentration of Pb2+ by subtracting the solubility of Pb(IO3)2 from the given [Pb2+].

[Pb2+] = 8.50 × 10-6 M

Excess concentration of

Pb2+ = [Pb2+] - (2 × 6.3 × 10-5) M = 8.50 × 10-6 - 1.26 × 10-4 = - 1.17 × 10-4 M

Step 4: Since two moles of Pb2+ is produced for every mole of NaIO3, we can divide the excess concentration of Pb2+ by 2 to get the concentration of

NaIO3. [NaIO3] = Excess concentration of Pb2+ ÷ 2 = (-1.17 × 10-4) ÷ 2 = -5.85 × 10-5 M

Note that the result is negative, which means that there is no NaIO3 in the solution. This is because all the NaIO3 has reacted with Pb(IO3)2 to form Pb2+ and IO3-. Therefore, the concentration of NaIO3 is 0 M.

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what is the new temperature, in degrees celsius, when the volume of the sample is changed at constant pressure and amount of gas to 1200 ml ?

Answers

The new temperature, when the volume of the sample is changed to 1200 ml at constant pressure and amount of gas, is 30 °C.

To determine the new temperature when the volume of a gas sample is changed at constant pressure and amount of gas, we can use the combined gas law equation:(P1 × V1) / T1 = (P2 × V2) / T2
Given that the pressure (P) and amount of gas (n) are constant, we can rewrite the equation as:
(V1 / T1) = (V2 / T2)
Let's assume the initial volume (V1) is 1000 ml and the initial temperature (T1) is 25 °C. The final volume (V2) is 1200 ml.
Plugging in the values into the equation:
(1000 ml / 25 °C) = (1200 ml / T2)
Solving for T2:T2 = (1200 ml / (1000 ml / 25 °C))

T2 = 30 °C
Therefore, the new temperature, when the volume of the sample is changed to 1200 ml at constant pressure and amount of gas, is 30 °C.

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Determine whether each salt will form a solution that is acidic, basic, or pH neutral. Please explain.
A. FeCl3
B. NaF
C. CaBr2
D. NH4Br
E. C6H5NH3NO2

Answers

The pH of the salt depends on its anion and cation. The following is the breakdown of each salt:A. FeCl3Solution: acidic.

Explanation: Iron (III) chloride hydrolyzes in water to produce hydrogen chloride and iron (III) hydroxide. Hydrogen chloride is an acid, therefore a solution of iron (III) chloride is acidic.B. NaFSolution: pH neutralExplanation: Sodium fluoride is the salt that is formed from a weak base and a strong acid. Since the base is weak and the acid is strong, the salt is expected to have a basic anion and an acidic cation, making it pH neutral. C. CaBr2Solution: pH neutral.

Calcium bromide is an example of a salt that is formed from a strong acid and a strong base. Since both ions are neutral, the solution is pH neutral.D. NH4BrSolution: acidicExplanation: Ammonium bromide hydrolyzes in water to form hydrobromic acid and ammonium hydroxide. Since hydrobromic acid is an acid, a solution of ammonium bromide is acidic.E. C6H5NH3NO2Solution: basicExplanation: The anion of phenylammonium nitrate is nitrate ion, which is a weak base. Phenylammonium cation is acidic, but since nitrate is a weak base, the solution is basic. Therefore, the solution of C6H5NH3NO2 is basic.

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does chlorine or bromine have a more negative electron affinity

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Chlorine has a lower electron affinity than bromine because it has a smaller nuclear charge and a larger atomic radius. This makes it less able to attract electrons to itself, whereas bromine has a larger nuclear charge and a smaller atomic radius, making it more effective at attracting electrons towards itself. Hence, the electron affinity of bromine is more negative than that of chlorine.

The electron affinity is defined as the energy required for an isolated gaseous atom to gain an electron to form a negative ion. Both chlorine and bromine are halogens, and they are located in the same group of the periodic table, meaning they have the same number of valence electrons. Nonetheless, bromine has a more negative electron affinity than chlorine, implying that it is more effective at attracting electrons towards itself than chlorine.Let's look at the explanations of why chlorine or bromine has a more negative electron affinity:The electron affinity of an atom increases as it becomes more difficult to add an electron to it, i.e., when the atom's atomic radius decreases. Bromine's atomic radius is greater than chlorine's, making it more difficult for bromine to attract electrons to itself. Despite this, bromine has a more negative electron affinity than chlorine, indicating that its nucleus has a greater hold over the added electrons.Chlorine has a lower electron affinity than bromine because it has a smaller nuclear charge and a larger atomic radius. This makes it less able to attract electrons to itself, whereas bromine has a larger nuclear charge and a smaller atomic radius, making it more effective at attracting electrons towards itself. Hence, the electron affinity of bromine is more negative than that of chlorine.

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the standard cell potential (e°cell) for the reaction below is 1.10 v. the cell potential for this reaction is ________ v when the concentration of and zn (s) cu2 (aq) → cu (s) zn2 (aq)

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The given equation is: Zn (s) + Cu2+ (aq) → Cu (s) + Zn2+ (aq). Given that, the standard cell potential (E°cell) for the above reaction is 1.10 V.

Now, we need to calculate the cell potential (Ecell) when the concentration of [Cu2+] and [Zn2+] is 0.10 M.

The Nernst equation is used to calculate the cell potential under non-standard conditions. Ecell = E°cell - (0.0592/n)logQ where, Q = reaction quotient n = the number of electrons transferred.

Thus, the equation for the given reaction is written as follows: Zn (s) + Cu2+ (aq) → Cu (s) + Zn2+ (aq).

Now, calculate the reaction quotient, Q.Q = ([Cu2+][Zn2+])/([Zn][Cu2+]) = ([Cu2+]^1/[Zn2+]^1).

On substituting the given values, we get;Q = (0.10/1)/(1/0.10)Q = 1Ecell = E°cell - (0.0592/2)logQ = 1.10 - 0.0296log (1) = 1.10 V.

Thus, the cell potential when the concentration of [Cu2+] and [Zn2+] is 0.10 M is 1.10 V, which is the same as the standard cell potential (E°cell).

Hence, the correct answer is 1.10V.

Note: The number of electrons transferred in the given reaction is 2.

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given the following equation 2k cl2 --> 2kcl how many moles of kcl are produced from 2.00 moles of k and excess cl2

Answers

To find out how many moles of KCl are produced from 2.00 moles of K and excess Cl2, you need to follow the balanced chemical equation of the given reaction which is:2K + Cl2 → 2KClFrom the balanced chemical equation, we can see that one mole of Cl2 reacts with two moles of K and produces two moles of KCl.

It means, in order to calculate the number of moles of KCl produced, we need to know the limiting reactant, i.e., which reactant is completely consumed and which reactant is left over.Explanation:In this reaction, K is given as 2.00 moles, but we don't know the amount of Cl2 given, therefore, we cannot predict which reactant is limiting. However, it is mentioned that Cl2 is in excess which means that it is not completely consumed, hence, K is the limiting reactant and Cl2 is in excess.

As we know, the balanced chemical equation shows that two moles of K reacts with one mole of Cl2, so in this case, 2.00 moles of K will react with 1.00 mole of Cl2 (since Cl2 is in excess and some of it will be left over).Now, we will use the mole ratio from the balanced equation to calculate the moles of KCl produced.Number of moles of KCl produced = (2.00 mol K) x (2 mol KCl/2 mol K) = 2.00 mol KCl. Therefore, 2.00 moles of K react with 1.00 mole of Cl2 and produce 2.00 moles of KCl.

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what is the correlation between the number of different codons of an amino acid and the frequency of the amino acid in proteins for this bacteria?

Answers

The number of different codons for an amino acid and the frequency of the amino acid in proteins is correlated for a given bacterium. The codon usage bias of the bacterium helps to dictate the frequency of the amino acids in proteins.

There are 64 different codons for 20 different amino acids, and this implies that multiple codons can encode the same amino acid. However, the occurrence of synonymous codons in a bacterium's genome is not uniform, and some codons are used more frequently than others. This phenomenon is known as codon usage bias, and it varies between bacterial species.

This is determined by the tRNA population and other factors that may impact gene expression. There is a correlation between the number of different codons for an amino acid and the frequency of that amino acid in proteins for a given bacterium. For example, the bacterium Escherichia coli has 4 codons for phenylalanine, with UUU being the most frequent. As a result, phenylalanine is one of the most frequent amino acids in E. coli proteins.

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Balance the redox reaction in acidic solution: Cu(s)+N O − 3 (aq)→C u 2+ (aq)+N O 2 (g) Express your answer as a chemical equation including phases.

Answers

The balanced redox reaction between copper (Cu) and nitrate ion (NO₃⁻) in acidic solution is:

Cu(s) + 2NO₃⁻(aq) + 4H⁺(aq) → Cu²⁺(aq) + 2NO₂(g) + 2H₂O(l)

To balance the redox reaction, we ensure that the number of atoms on both sides of the equation is equal and that the charges are balanced. Here's a step-by-step explanation of the balancing process:

Assigning oxidation numbers to each element: Cu(s) has an oxidation number of 0, NO₃⁻(aq) has an oxidation number of +5, Cu²⁺(aq) has an oxidation number of +2, and NO₂(g) has an oxidation number of +4.

Identifying the elements undergoing oxidation and reduction: Cu is being oxidized from 0 to +2, while NO₃⁻ is being reduced from +5 to +4.

Balancing the number of atoms: Placing a coefficient of 2 in front of NO₃⁻ to balance the number of nitrogen and oxygen atoms on both sides.

Balancing the charges: Adding 4H⁺(aq) on the left side to balance the charges. This also helps in balancing the hydrogen atoms.

Balancing the oxygen atoms: Adding 2H₂O(l) on the right side to balance the oxygen atoms.

The final balanced equation is Cu(s) + 2NO₃⁻(aq) + 4H⁺(aq) → Cu²⁺(aq) + 2NO₂(g) + 2H₂O(l).

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what is the systematic name for the compound shown? the name should have the format alkanamine. a three carbon ring bonded to n h, which is bonded to c h 2 c h 3.

Answers

The systematic name for the compound is N-methylethanamine.

The longest chain consists of two carbon atoms. Hence, the root name of the structure given is Ethan. Choose the longest chain with the lowest number of substituents. Make sure that substituents on the longest chain are at the lowest number. Connect the methyl group to the nitrogen atom.

The presence of methyl group on one nitrogen gives the prefix N-methyl. The presence of an amine functional group gives the suffix name amine. So the IUPAC name of the compound becomes N-methylethanamine.

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are these results for ccl2ch2 consistent with what you observed in avogadro (within a few degrees)? explain briefly.

Answers

The results for CCl₂CH₂ in Avogadro are consistent with the expected bond angles within a few degrees. The measured bond angles are within a few degrees of the idealized bond angles for a trigonal planar molecular shape.

To evaluate the consistency of the observed bond angles for CCl₂CH₂ in Avogadro, we can compare the measured bond angles with the VSEPR idealized bond angles.

Based on the information provided, the measured bond angles are as follows:

- CI-C-CI: 120°

- C=C-H: 110°

- CI-C#C: 110°

- H-C-H: 120°

In a trigonal planar molecular shape, the idealized bond angle is 120°.

Comparing the measured bond angles with the idealized bond angles, we can see that they are within a few degrees of each other. The measured bond angles are consistent with the expected bond angles based on the trigonal planar molecular shape.

Therefore, the results for CCl₂CH₂ in Avogadro are consistent with the expected bond angles within a few degrees.

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Complete question :

CCl2CH2 Lone pairs of electrons (central atom) 3 Bonding groups (central atom) Total valence electrons 24 VSEPR Molecular shape (central atom) Choose trigonal planar Table view List view 4b. Evaluating the structure of CCI,CH2 Measured bond angle VSEPR Idealized bond angle CI-C-CI 120 C=C-H 110 CI-C#c 110 H-C-H 120 (1 pts) 4c. Are these results for CCI,CH2 consistent with what you observed in Avogadro (within a few degrees)? Explain briefly. Normal BIU X - EEE

When using a water-cooled condenser, the water should Choose... make this happen, the water should flow in at the

Answers

When using a water-cooled condenser, the water should flow in at the lower part of the condenser and leave from the upper part. Here's the main answer and  for your question:

When using a water-cooled condenser, the water should flow in at the lower part of the condenser and leave from the upper part. When using a water-cooled condenser, it is essential to note that the water should flow in at the lower part of the condenser and leave from the upper part. This is due to the fact that the liquid refrigerant is generally heavier than the gas refrigerant.

As a result, the liquid will fall to the bottom of the condenser, where it will be cooled by the circulating water. The refrigerant will subsequently evaporate and exit from the upper part of the condenser as a gas.This flow is critical since if the water were to enter the condenser at the top and leave from the bottom, the liquid refrigerant would be prevented from evaporating and exiting the condenser. As a result, the condenser would become flooded, which would severely impede its efficiency.

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what does the formnation of yellow color in the tube mean? what events lead to

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The formation of yellow color in the tube indicates that the reaction has occurred between the enzyme and substrate.

This color change is the that helps to indicate whether the reaction has taken place or not.The enzymes can act as catalysts that enhance the rate of chemical reactions by decreasing the activation energy required for a particular reaction to occur.The formation of yellow color in the tube usually indicates that a particular chemical reaction has occurred between an enzyme and substrate. For instance, if a reaction occurs, the yellow color can be caused by the production of the product. Conversely, if no reaction occurs, then the absence of the yellow color indicates no reaction occurred.

In enzyme assays, we usually measure the rate of the reaction by monitoring the production of the product, which is usually indicated by a color change. This color change is the that helps to indicate whether the reaction has taken place or not. Therefore, the formation of yellow color is usually an important aspect in most enzyme assays.

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the condensation process requires group of answer choices condensation nuclei alone. condensation nuclei and saturated air. moisture droplets. dew-point temperatures alone.

Answers

The condensation process requires condensation nuclei and saturated air.

Condensation is the process by which water vapor transforms into liquid when it is cooled. It's a crucial component of the water cycle, which is the process by which water circulates through the environment and the atmosphere. Condensation happens when the air is saturated with water vapor and the temperature drops, causing the water vapor to change from a gas to a liquid state. Condensation is caused by a lack of thermal energy in the environment. When air is cooled to its dew point temperature, it becomes saturated with water vapor, and excess water vapor must condense into tiny droplets or ice crystals to maintain balance in the atmosphere.

Condensation nuclei play a crucial role in the condensation process, as they provide a surface upon which moisture droplets can form. These nuclei can be any tiny particle in the atmosphere, such as dust, smoke, or salt particles, which serve as a surface for water vapor to condense onto.

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how many grams of vanadium may be formed by the passage of 3,232 c through an electrolytic cell that contains an aqueous v(v) salt.

Answers

0.034 grams of vanadium may be formed by the passage of 3,232 C through an electrolytic cell that contains an aqueous V(V) salt.

To find out how many grams of vanadium are formed by the passage of 3,232 C through an electrolytic cell that contains an aqueous V(V) salt, we'll need to use Faraday's Law.

Faraday's Law can be used to calculate the amount of a substance produced at an electrode during an electrolysis process.What is Faraday's Law?Faraday's Law states that the amount of a substance produced at an electrode during an electrolysis process is directly proportional to the amount of electricity (in Coulombs) passed through the cell and the equivalent weight of the substance being produced.

Faraday's Constant, which is the amount of electrical charge carried by one mole of electrons, is equal to 96,485 C/mol. It's worth noting that one Faraday of electricity (96,485 C) will produce one mole of the substance being produced.

Let's now use this information to calculate the amount of vanadium formed in the given scenario. we need to find the equivalent weight of vanadium. We can do this by dividing the atomic weight of vanadium by its valence state.

V(V) has an atomic weight of 50.94 g/mol and a valence state of 5, so the equivalent weight of vanadium will be: Equivalent weight = Atomic weight / Valence state Equivalent weight = 50.94 g/mol / 5Equivalent weight = 10.188 g/mol

Now that we have the equivalent weight of vanadium, we can use Faraday's Law to calculate how many grams of vanadium will be formed by the passage of 3,232 C through the cell.

The equation for this is:Amount of substance produced = (Current x Time x Equivalent weight) / Faraday's ConstantThe current (I) is the rate of flow of electric charge, which is given as 3,232 C. The time (t) is not given, so we'll assume that it is one hour (3600 seconds).

Substituting these values into the equation, we get: Amount of vanadium produced = (3232 C x 1 hour x 10.188 g/mol) / 96485 C/mol Amount of vanadium produced = 0.034 g

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determine+the+masses+of+dry+air+and+the+water+vapor+contained+in+a+187+m3+room+at+93+kpa,+28+0c,+and+45+%+relative+humidity.

Answers

The molar mass of air is 28.97 g/mol Mass of water vapor:

water = (1.68 × 10⁴ Pa × 187 m³)/(8.31 × (28 + 273) K) = 14.9 mol

Mass of water vapor = 14.9 mol x 18.02 g/mol = 268 g Mass of air:

air = (91.32 × 10³ Pa × 187 m³)/(8.31 × (28 + 273) K) = 753

mol Mass of dry air = 753 mol x 28.97 g/mol = 21.8 kg

Therefore, the mass of dry air is 21.8 kg and the mass of water vapor is 268 g in the given room.

Given:Volume of the room = 187 m³Pressure = 93 kPa Temperature = 28°C

Relative humidity = 45% To find: The masses of dry air and the water vapor Solution:We can use Dalton's law of partial pressure and the gas laws to solve the problem.The total pressure in the room is made up of the partial pressures of water vapor and dry air.

total = water + airPV = nRTn = PV/RT

where P is the pressure V is the volumeR is the gas constanT is the temperaturen is the number of moles of the gas Water vapor:Partial pressure of water vapor:

water = Relative humidity x Saturation pressure

where Saturation pressure is the pressure of the water vapor when the air is saturated at a given temperature At 28°C, the saturation pressure is 3.74 kPa.

Relative humidity = 45%water = 0.45 × 3.74 = 1.68 kPa Dry air:

Partial pressure of dry air:air = Ptotal - Pwaterair = 93 - 1.68 = 91.32 kPa

The ideal gas law:n = PV/RT The molar mass of water vapor (H₂O) is 18.02 g/mol

The molar mass of air is 28.97 g/molMass of water vapor:

water = (1.68 × 10⁴ Pa × 187 m³)/(8.31 × (28 + 273) K) = 14.9 mol

Mass of water vapor = 14.9 mol x 18.02 g/mol = 268 gMass of air:

air = (91.32 × 10³ Pa × 187 m³)/(8.31 × (28 + 273) K) = 753

mol Mass of dry air = 753 mol x 28.97 g/mol = 21.8 kg

Therefore, the mass of dry air is 21.8 kg and the mass of water vapor is 268 g in the given room.

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Which of the following is a difference between the cells used for electrolysis of water and electrolysis of molten sodium chloride?

Select the correct answer below:

A. A barrier separates the half-reactions in the cell carrying out electrolysis of molten sodium chloride but not in the cell carrying out electrolysis of water.
B. Sulfuric acid is added to the cell carrying out the electrolysis of molten sodium chloride but not to the cell carrying out the electrolysis of water.
C. Inert electrodes are used in the cell carrying out the electrolysis of water but not in the cell carrying out the electrolysis of molten sodium chloride.
D. A power supply is used in the cell carrying out the electrolysis of water but not in the cell carrying out the electrolysis of molten sodium chloride.

Answers

The difference between the cells used for the electrolysis of water and electrolysis of molten sodium chloride is that a barrier separates the half-reactions in the cell carrying out the electrolysis of molten sodium chloride but not in the cell carrying out the electrolysis of water. Therefore, the correct option is A.

The process of electrolysis is the breaking of a substance, which occurs by the electric current into simpler components, which the substances are usually water, acids, salts, and some other compounds. During electrolysis, the compounds are separated into their component elements when they are in the molten state or when they are dissolved in water. The electrolysis of water and molten sodium chloride are two different processes.

The following is a difference between this two electrolysis:

In the electrolysis of water, the molecules of water are decomposed into hydrogen and oxygen gases. The half-reactions in the cell do not require to be separated from each other by a barrier, while in molten sodium chloride electrolysis, a barrier separates the half-reactions in the cell.

Hence, option A is the correct answer.

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We mixed 30 ml of 1.0 M HCl with 70 ml of 1.0 M NaOH. What is the theoretical value for the temperature increase? Express your answer in ∘C.
a) 0.0 ∘C
b) 10.0 ∘C
c) 20.0 ∘C
d) 30.0 ∘C

Answers

Let's determine the theoretical value for temperature increase. Option (a) is correct. The temperature change (∆T) is calculated by using the following formula:

∆T = q / m * C

where, q = heat, m = mass and C = specific heat capacity.So, we can say that:

Theoretical value of temperature increase = ∆TWe

know that:Concentration of HCl (C1) = 1.0 MConcentration of

NaOH (C2) = 1.0 MVolume of HCl (V1) = 30 ml

Volume of NaOH (V2) = 70 ml

Molar mass of HCl = 36.5 g/mol

Molar mass of NaOH = 40 g/molDensity of HCl = 1.18 g/ml

Density of NaOH = 1.25 g/ml

Specific heat of the mixture (Cp) = 4.18 J/g °C

Since, the given HCl and NaOH solutions are present in equal amounts, so their molarity and density will be the same. Now, let's find out the mass of HCl and NaOH we have taken:Mass of HCl = Volume × Density = 30 ml × 1.18 g/ml = 35.4 g Mass of NaOH = Volume × Density = 70 ml × 1.25 g/ml = 87.5 gNow, let's calculate the heat evolved in this reaction: Heat evolved (q) = m × C × ∆T, where q = 0, m = 123 g (total mass of the solution) and C = 4.18 J/g °C.Then,∆T = 0 / (123 g) × 4.18 J/g°C ∆T = 0. So, the theoretical value for the temperature increase is 0.0 °C.

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A flask is charged with 1.00 atm of pure A(g). When equilibrium is established, the partial pressure of A(g) in the flask is 0.40 atm. What is the value of Kp for this equilibrium?
a) 0.40
b) 0.60
c) 0.70
d) 2.50

Answers

, A flask is charged with 1.00 atm of pure A(g). When equilibrium is established, the partial pressure of A(g) in the flask is 0.40 atm.

We are to find the value of Kp for this equilibrium. We can find Kp for this equilibrium by using the following formula;Kp = P(A)²/P(total) - P(A)² where P(A) and P(total) are the partial pressure of A and total pressure respectivelyWe can find P(total) by using the following equation;P(total) = P(A) + P(other)where P(A) and P(other) are the partial pressure of A and other species respectivelySo,

we have;P(total) = P(A) + P(other)1.00 atm = 0.40 atm + P(other)P(other) = 1.00 - 0.40 = 0.60 atmSubstituting the value of P(A), P(other) and P(total) into the equation for Kp, we have;Kp = P(A)²/P(total) - P(A)²Kp = (0.40)²/(1.00 - 0.40)Kp = 0.16/0.60Kp = 0.2667 (approximate to 3 significant figures)Therefore, the is 0.2667. is provided above.

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suggest a reason why the rate of electron transfer involving oxidant [co(iii)(phen)3]3 is a million times slower than for the oxidant [co(iii)cl(nh3)5]2

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The reason why the rate of electron transfer involving oxidant [Co(III)(phen)3]3 is a million times slower than for the oxidant [Co(III)Cl(NH[tex]_3[/tex])[tex]_5[/tex]][tex]_2[/tex] is that [Co(III)(phen)[tex]_3[/tex]][tex]_3[/tex] is more inert towards the oxidation state than Co(III)Cl(NH[tex]_3[/tex])[tex]_5[/tex]][tex]_2[/tex]

This indicates that [Co(III)(phen)[tex]_3[/tex]][tex]_3[/tex] has a slower rate of electron transfer compared to Co(III)Cl(NH[tex]_3[/tex])[tex]_5[/tex]][tex]_2[/tex]. The reason for this is that the ligand phen in [Co(III)(phen)[tex]_3[/tex]][tex]_3[/tex] is tridentate and forms more stable and strong bonds with the Co(III) cation compared to the bidentate ligand NH[tex]_3[/tex] in Co(III)Cl(NH[tex]_3[/tex])[tex]_5[/tex]][tex]_2[/tex], which forms weaker and less stable bonds.

Therefore, the tridentate ligand in [Co(III)(phen)[tex]_3[/tex]][tex]_3[/tex] has a stronger influence on the electronic configuration and coordination of the cobalt cation, making it more inert and less available for electron transfer.

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Use the principle of double displacement reactions and the solubility rules to determine the products and correctly balance the reaction: FeSO4 (aq) + (NH4)3PO4 →

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The balanced equation for the double displacement reaction between FeSO4 (aq) and (NH4)3PO4 is:

3FeSO4 + 2(NH4)3PO4 → Fe3(PO4)2 + 6NH4SO4

The balanced double displacement reaction between FeSO4 (aq) (iron(II) sulfate) and (NH4)3PO4 (ammonium phosphate) can be determined using the solubility rules.

First, let's identify the ions present in the reactants:

FeSO4 dissociates into Fe2+ and SO4^2- ions.

(NH4)3PO4 dissociates into NH4+ and PO4^3- ions.

The solubility rules state that most sulfates (SO4^2-) are soluble, and most ammonium (NH4+) and phosphate (PO4^3-) compounds are also soluble. Therefore, both FeSO4 and (NH4)3PO4 are soluble in water.

To balance the reaction, we need to ensure that the number of atoms of each element is equal on both sides of the equation.

The balanced equation for the double displacement reaction between FeSO4 (aq) and (NH4)3PO4 can be written as:

3FeSO4 + 2(NH4)3PO4 → Fe3(PO4)2 + 6NH4SO4

In this balanced equation, both sides have three iron atoms (Fe), twelve hydrogen atoms (H), eight oxygen atoms (O), and two phosphorus atoms (P).

The products of the reaction are Fe3(PO4)2 (iron(III) phosphate) and NH4SO4 (ammonium sulfate).

Therefore, the balanced equation for the double displacement reaction between FeSO4 (aq) and (NH4)3PO4 is:

3FeSO4 + 2(NH4)3PO4 → Fe3(PO4)2 + 6NH4SO4

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using the kaputnskii equation and the following ionic radii, determine the lattice enthalpy for mgf2. the ionic radii for mg 2 and f-1 are 86 pm and 117 pm respectively.

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The Kapustinskii equation is used to calculate the lattice energy of ionic solids. The lattice enthalpy for MgF2 can be calculated using the Kaputnskii equation and the given ionic radii for Mg2+ and F-.

Step 1: Determine the distance between the Mg2+ and F- ions using their ionic radii. The distance between the Mg2+ and F- ions can be calculated as follows: Distance = r+ + r-where r+ is the radius of the Mg2+ ion and r- is the radius of the F- ion. Distance = 86 pm + 117 pm Distance = 203 pm

Step 2: Calculate the lattice energy using the Kapustinskii equation. The Kapustinskii equation is given by: U = - (α * NA * NB * e2 * z+ * z- ) / 2rwhere U is the lattice energy, α is the Madelung constant, NA and NB are Avogadro's numbers for the cation and anion, e is the electronic charge, z+ and z- are the charges on the cation and anion, and r is the distance between the cation and anion. U = - (1.748 * 6.022 × 1023 * 6.022 × 1023 * (1.602 × 10-19)2 * 2 * 2) / (2 * 203 × 10-12)U = - 3.753 × 106 J/mol, Therefore, the lattice enthalpy for MgF2 is 3.753 × 106 J/mol.

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how many grams of molybdenum may be formed by the passage of 40.4 amps for 2.162 hours through an electrolytic cell that contains an aqueous mo(iii) salt.

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The total mass of molybdenum that may be formed by the passage of 40.4 amps for 2.162 hours through an electrolytic cell that contains an aqueous Mo(III) salt is 12.19 grams.

Electrolysis is the process of breaking down an electrolyte into its constituents using direct electrical current. Electrolysis is a type of redox reaction in which oxidation and reduction occur simultaneously at separate electrodes. Electrolysis is used for various purposes, including the manufacture of non-ferrous metals (such as aluminium, magnesium, and titanium), the refining of metals, and the production of hydrogen and oxygen. An electrolytic cell is an electrochemical cell that is used to conduct an electrolysis reaction.

Electrolysis is used in this process to break down the substance to its individual components. The electrolytic cell's components include two electrodes, the anode and the cathode, that are submerged in an electrolytic solution. The solution includes dissolved ions of the compound that is being separated.

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When the change in free energy for a reaction, (AG°) is positive, the correct statement for the equilibrium constant Keg is: a) Keq = 0 Ob) Keg > 1 c) Keq = 1 d) Keq <1

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When the change in free energy for a reaction, (AG°) is positive, the correct statement for the equilibrium constant Keg is:Keq <1.Therefore, the correct option among the given alternatives is d) Keq <1.

What is the equilibrium constant Keg Equilibrium constant is a numerical value that shows how much a chemical reaction favors reactants or products at equilibrium. It is a ratio of product concentrations to reactant concentrations at equilibrium and can be calculated by applying concentration or pressure of each component in the balanced equation.

For a reaction at standard conditions, the equilibrium constant is called K°. If the value of ΔG° of a reaction is positive, then the reaction is not spontaneous, and the value of Keg is less than 1. Therefore, the option Keq <1 is correct for the given question.

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To increase solubility of a gas into a liquid the most, then A) neither pressure or temperature affects solubility. B) increase the temperature and lower the pressure. C) decrease the temperature and raise the pressure. D) increase the temperature and raise the pressure. E) decrease the temperature and lower the pressure.

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The correct answer is option D, which is to increase the temperature and raise the pressure to increase solubility of a gas into a liquid the most. Solubility is the maximum quantity of a substance that can be dissolved in a particular solvent at a specific temperature, and it is typically expressed as g/100 mL or mL/L.

The correct answer is option D, which is to increase the temperature and raise the pressure to increase solubility of a gas into a liquid the most. Solubility is the maximum quantity of a substance that can be dissolved in a particular solvent at a specific temperature, and it is typically expressed as g/100 mL or mL/L. The concentration of a dissolved gas in a liquid is governed by Henry's law. According to Henry's law, the amount of a gas that dissolves in a liquid is directly proportional to the pressure of the gas above the liquid (or in contact with the liquid). When pressure is increased, the solubility of a gas in a liquid rises. Furthermore, when the temperature of the solution is raised, the solubility of gases in liquids decreases because the rate of escaping gas molecules is raised when temperature is raised. Therefore, to increase the solubility of a gas in a liquid the most, you must increase the pressure and temperature.
The solution needs to be at a high pressure so that more gas molecules are available to dissolve in the liquid. A high-temperature solvent also has more kinetic energy, which allows it to dissolve more gas. Furthermore, reducing the pressure has the opposite effect, causing the gas to bubble out of the liquid. A decrease in temperature reduces the solubility of a gas in a liquid.

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what is the solubility of silver oxide, , in a solution buffered at ph 10.50? the equilibrium is

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The solubility of silver oxide, in a solution buffered at pH 10.50 is 5.95 x 10^-11 M.

Let's first start by writing the chemical equation for the dissociation of silver oxide:Ag2O(s) ⇌ 2 Ag+ (aq) + O2− (aq)The expression for the solubility product constant, Ksp, is given by the following equation:Ksp = [Ag+]2 [O2-]Thus, the solubility of Ag2O can be calculated by solving for [Ag+].Now, we can use the Henderson-Hasselbalch equation, which relates the pH of a solution to the pKa of its buffer: pH = pKa + log ([base] / [acid])Rearranging this equation: [base] / [acid] = 10^(pH - pKa)Using the pKa of the buffer and the pH of the solution

we can find the ratio of [base] to [acid]. The buffer consists of a weak base (A-) and its conjugate acid (HA):A-(aq) + H+(aq) ⇌ HA(aq)Since we know the pH of the solution, we can calculate the concentration of H+ ions. We can then use the equilibrium expression to find the ratio of [A-] to [HA].Now we can substitute the ratio of [A-] to [HA] into the expression for the solubility product constant to solve for the solubility of Ag2O.Main answer:The solubility of silver oxide, in a solution buffered at pH 10.50 is 5.95 x 10^-11 M.

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at mass of cu(s) is electroplated by running 20.0 a of current through a cu2+(aq) solution for 4.00 h ? express your answer to three significant figures and include the appropriate units.

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To determine the mass of Cu(s) electroplated, we need to use Faraday's law of electrolysis, which states that the mass of a substance deposited or liberated at an electrode is directly proportional to the quantity of electricity passed through the cell. The equation for Faraday's law is:

m = (I * t * M) / (n * F)

where:

m is the mass of the substance deposited (in grams),

I is the current (in amperes),

t is the time (in seconds),

M is the molar mass of the substance (in grams/mole),

n is the number of electrons involved in the reaction,

F is the Faraday constant (96,485 C/mol).

In this case, we are plating copper (Cu) using a Cu2+(aq) solution. The number of electrons involved in the reaction is 2 since each Cu2+ ion gains two electrons to form Cu(s). The molar mass of copper is 63.55 g/mol.

Given:

Current (I) = 20.0 A

Time (t) = 4.00 h = 4.00 * 60 * 60 s = 14,400 s

Substituting the given values into the equation, we have:

m = (I * t * M) / (n * F)

 = (20.0 A * 14,400 s * 63.55 g/mol) / (2 * 96,485 C/mol)

Calculating the value:

m = (20.0 * 14,400 * 63.55) / (2 * 96,485)

 ≈ 372.31 g

Therefore, the mass of Cu(s) electroplated is approximately 372.31 grams.

By applying Faraday's law of electrolysis, we determined that when running a current of 20.0 A through a Cu2+(aq) solution for 4.00 hours, approximately 372.31 grams of Cu(s) will be electroplated.

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calculate the value of ni for gallium arsenide (gaas) at t = 300 k. the constant b = 3.56 × 1014 cm−3k−3/2 and the bandgap voltage eg = 1.42 ev. compare with that of silicon at the same temperature.

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The value of ni for gallium arsenide (GaAs) at t = 300 K, the constant b = 3.56 × 1014 cm−3K−3/2 and the bandgap voltage Eg = 1.42 eV and comparing it with that of silicon at the same temperature.

Here,B is the constant given as b = 3.56 × 10^14 cm−3K^(-3/2)T = 300 K, Eg = 1.42 eV, k = 1.38 × 10^(-23) J/KSubstitute all the values in the given equation;ni² = (3.56 × 10^14 cm−3K^(-3/2))(300^3/2)e^(-1.42/2(1.38 × 10^(-23))(300))Solving the above expressionni² = 2.2 × 10^(19) cm^(-6)ni = 4.69 × 10^9/cm³For silicon at the same temperature, ni is given as;ni² = 1.5 × 10^(10) T^(3/2) e^(-Eg/2KT)Here,T = 300 K, Eg = 1.12 eV, k = 1.38 × 10^(-23) J/KSubstitute the values,ni² = (1.5 × 10^(10))(300^(3/2)) e^(-1.12/2(1.38 × 10^(-23))(300))Solving the above expression,ni² = 1.0 × 10^(20) cm^(-6)ni = 3.16 × 10^10/cm³

In this question, it is given to calculate the value of ni for Gallium Arsenide and compare it with Silicon at the same temperature.The equation to calculate ni is given as;ni² = B(T^(3/2)) e^(-Eg/2KT)where;ni is the intrinsic carrier concentrationB is the constant givenT is the temperatureEg is the bandgap voltagek is Boltzmann's constantAfter substituting the given values in the above equation for GaAs and Silicon, we got the intrinsic carrier concentration ni for GaAs is 4.69 × 10^9/cm³ and that for Silicon is 3.16 × 10^10/cm³.

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What, if any, precipitate forms when an aqueous solution of zinc chloride is mixed with an aqueous solution of ammonium phosphate? a) NHACI b) Zn2(PO4)3 c) no precipitate d) Zn3(PO4)2 Od С Ob a

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When an aqueous solution of zinc chloride is mixed with an aqueous solution of ammonium phosphate, the precipitate formed is Zn₃(PO₄)₂.

Zinc chloride (ZnCl₂) dissociates into Zn²⁺ and 2Cl⁻ ions in solution, while ammonium phosphate (NH₄₃PO₄) dissociates into 3NH₄⁺ and PO₄³⁻ ions. When these ions combine, the Zn²⁺ ions react with the PO₄³⁻ ions to form the insoluble compound zinc phosphate (Zn₃(PO₄)₂), which precipitates out of solution.The other options listed, NH₄Cl (ammonium chloride) and Zn₂(PO₄)₃ (zinc phosphate), are incorrect. NH₄Cl will remain in solution as dissolved ions, and Zn₂(PO₄)₃ is the formula for zinc phosphate, not the precipitate formed in this specific reaction.Therefore, the correct answer is d) Zn₃(PO₄)₂, as it is the precipitate that forms when zinc chloride is mixed with ammonium phosphate.

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find kcat for a reaction in which vmax is 4 × 10-4 mol·min-1 and the reaction mixture contains one microgram of enzyme (the molecular weight of the enzyme is 200,000 d).

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The value of kcat for the reaction is 80,000 s-1.

Given parameters for the problem are:

vmax = 4 × 10-4 mol·min-1.

Enzyme (E) amount = 1 microgram (1 × 10-6 g)

MW of Enzyme (E) = 200,000 d(kcat) is the turnover number.

It is the number of substrate molecules converted into product by an enzyme molecule per unit time when the enzyme is fully saturated with substrate. It is measured in s-1.

To find kcat, we can use the formula:

vmax = kcat [E]

By substituting the given values, we get:

4 × 10-4 = kcat × (1 × 10-6 ÷ 200,000)⇒ kcat = (4 × 10-4 × 200,000) ÷ 1 × 10-6= 80,000 s-1

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The term kcat is defined as the turnover number of an enzyme, which is the number of substrate molecules an enzyme converts to product per unit time. Kcat can be calculated by dividing the Vmax value by the total enzyme concentration. The kcat value is 8 × 10^7 min^-1.

Here, we have to find the kcat of an enzyme when the Vmax is 4 × 10-4 mol·min-1 and the reaction mixture contains one microgram of enzyme (the molecular weight of the enzyme is 200,000 d).

To find the value of kcat, we need to use the following formula:

kcat = Vmax/[E]

where Vmax is the maximum velocity of the reaction, [E] is the concentration of the enzyme.

To find [E], we need to first find the number of moles of enzyme present in 1 microgram or 10^-6 g.

This can be calculated as follows:

Number of moles of enzyme = Mass of enzyme / Molecular weight

= 10^-6 g / 200,000 g/mol

= 5 × 10^-12 mol

Now, we can substitute the values in the kcat formula:

kcat = Vmax/[E]

= 4 × 10^-4 mol·min^-1 / 5 × 10^-12 mol

= 8 × 10^7 min^-1

Therefore, the kcat value is 8 × 10^7 min^-1.

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what is the purpose of adding bisulfite at the end of the reaction?

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The purpose of adding bisulfite at the end of the reaction is to convert the unmethylated cytosines to uracils and prevent them from being amplified in the PCR reaction.

This is known as bisulfite conversion, and it is a widely used method for analyzing DNA methylation patterns. The converted DNA can then be amplified by PCR, and the resulting product can be sequenced or analyzed in other ways to determine the methylation status of the original DNA.Main answer: The purpose of adding bisulfite at the end of the reaction is to convert the unmethylated cytosines to uracils and prevent them from being amplified in the PCR reaction.

Bisulfite conversion is a widely used method for analyzing DNA methylation patterns. The purpose of adding bisulfite at the end of the reaction is to convert the unmethylated cytosines to uracils and prevent them from being amplified in the PCR reaction.Bisulfite conversion of DNA involves the treatment of DNA with sodium bisulfite, which converts cytosine residues to uracil, but does not affect the methylated cytosine residues. After bisulfite treatment, the methylated cytosines are distinguished from unmethylated cytosines, as they remain as cytosines in the converted DNA sequence.

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