I really need help!

I promise I've been paying attention, it just goes in one ear and out the other ;-;

(question is in picture!)

Answer:

When melted at high temperature, sodium chlorideseparates into sodium and chloride ions, so that, electrolysis can take place to form sodium atom and chlorine gas .

The number of common amino acids that are formed and used by living organisms is twenty (20), and nine are essential for living.

Amino acids are the building blocks of proteins that are linked by peptide bonds to form biomolecules. Proteins may be composed of 20 different types of amino acids, which include 9 essential amino acids that the human cannot synthesize and must be consumed from the diet.

Amino acids include, for example, leucine, isoleucine, tryptophan, tyrosine, etc. All these molecules contain an amino group and also a carboxylic group that gives them the name of amino acids.

Therefore, with this data, we can see that amino acids are composed of an amine group and a carboxylic group and they are 20 of which nine (9) are essential because the human body cannot synthesize them and must be obtained from the foods.

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The frequency of the color of red light that has a wavelength of 663nm is 4.52 × 10¹⁴Hz.

Frequency of a wave is the quotient of the number of times (n) a periodic phenomenon occurs over the time (t) in which it occurs.

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

According to this question, the wavelength of a particular color of red light is 663nm. The frequency can be calculated as follows:

663 × 10-⁹ = 3 × 10⁸ ÷ f

f = 3 × 10⁸ ÷ 6.63 × 10-⁷

f = 4.52 × 10¹⁴Hz

Therefore, 4.52 × 10¹⁴Hz is the frequency of the color of the red light.

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The volume of 42 gallons in liters is 158.99 liters.

What is a bathtub?

It is a big and open container that is normally filled with water and used to bathe the body.

What is liter?

This is a  unit used in measuring volume. It is not a standard unit of measurement. A liter is equivalent in volume to a millistere. the symbol is ( L).

1 gallon = 3.7854 liters

Therefore 42 gallons  in liters will be:

42 *3.7854= 158.99 liters

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The total pressure of the system is 0.32 atm an the mole fraction argon  of the carbon dioxide is 0.75.

We know that where we have a mixture of gases, each of the gases would exert pressure on the walls of the container. The pressure that is exerted on the walls of the container is what we call the pressure of the gas.

We have;

Pressure of carbon dioxide = 0.080 atm

Pressure of argon = 0.24 atm

Total pressure of the system =  0.080 atm + 0.24 atm = 0.32 atm

Partial pressure = mole fraction * total pressure

Let the mole fraction be X

0.24 = X *  0.32 atm

X = 0.24 atm/0.32 atm

X =0.75

If I am to draw the number of particles, I would draw one particle for carbon dioxide and three particles for argon based on the value of the mole fraction of the system.

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Answer:

Calcium Hydroxide is more soluble in water

Explanation:

Calcium Hydroxide is more soluble in water as all group 2 carbonates are not very soluble while Group 2 hydroxides are moderately soluble.

In order to reconstruct Geologic History, geological principles must be used. Some of the principles of Geology used are:

Principle of Superposition: In a given vertical arrangement of undisturbed sedimentary layers of the flow of lava, the oldest layers are usually the first from the bottom up and the youngest are the first from top down. [See Image A]

Horizontality: Usually rock sediments are first deposited in an approximately horizontal manner. Where deformations such as folds and tilts are observed, it is a result of deformation which comes after deposition.

Inclusion: All Inclusions that are not part of the rock formation are deemed to be older that the rock formation.

Metamorphism: A hot magma intrusion "bakes" the somewhat colder surrounding rock. The rock that is cooked during this Contact Metamorphism procedure must be older.

Cross- Cu.tt.ing Relations: If one geological feature cuts over another, the cut feature is older.

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Explanation:

E =hv

= h*3*10power8meterpersecond ÷6.22*10power of -7m

where h is planks constant

Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.

An electron's energy is determined by where it is in relation to the atom's nucleus. The distance an electron in an atom has to travel from the nucleus depends on its energy level.

The mass of an electron is roughly 1/1836 that of a proton. The intrinsic angular momentum (spin) of the electron is given in units of the decreased Planck constant and has a half-integer value.

Energy has a negative sign, meaning that an electron is drawn to the nucleus. The electron has the least energy in the first orbit, and as n grows, or as it gets less negative, the electron's energy increases.

Therefore, Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.

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Hello!

Answer:

True :P

The mass of the iron at 100°C is equal to 531.3 grams.

The specific heat capacity can be defined as the quantity of heat required to raise the temperature by one-degree Celcius in one unit of substance.

The energy is lost or absorbed will change the temperature of the substance, which can be shown as:

Q = mCΔT

Given, the initial temperature of the iron = 100°C

The initial temperature of water = 25 °C

The final temperature of both iron and water = 65°C

The specific heat capacity of the iron, C = 0.450 J/g°C

Water's specific heat capacity, C = 4.184 J/g°C

Heat lost by Iron (Fe) = Heat absorbed by water

- m × (0.450 J/g°C) × (65 - 100)°C =  50 × (4.184 J/g°C) × (65 - 25)°C

15.75 m = 8368

m = 531.3 g

Therefore, the mass of the iron is 531.3 grams.

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Answer:

During complete combustion, natural gas combines with oxygen to produce carbon dioxide and water vapor.

Explanation:

A fuel undergoes a complete combustion process when it swiftly combines with oxygen (O2), which then forms carbon dioxide (CO2) and water (H2O).

The number of photons that is emitted per second is 7.9 * 10^18 photons per second.

We know that the photons have to do with the particles of light that are in motion. Now, we know that the power that is being produced by the heat lamps have been obtained as 26.0 watts. It is also know that this could be written as 26 J/s.

We now have to find the energy of the photons;

Wavelength of the photons = 6.0 μm or 6 * 10^-6 m

Plank's constant = 6.6 * 10^-34 Js

Speed of light = 3 * 10^-10 m/s

Now, we have

E = 6.6 * 10^-34 * 3 * 10^-10 /6 * 10^-6

E = 3.3 * 10^- 18 J

We have;

26 J/s * 1 photon/ 3.3 * 10^- 18 J

= 7.9 * 10^18 photons per second.

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The intermolecular forces between the oxygen molecules are very weak because of which a very less amount of energy is required for the oxygen to evaporate into a gas. There is no H-bonding or dipole movement present in oxygen molecules because of which the forces binding the molecules are absent in oxygen.

hence your correct option should be D

A 10-kg bag of goods on a shelf one meter above the ground has a gravitational potential of GPE= (10 kg)(9.8 m/s2) (1 m) GPE= 98

GRAVITATIONAL POTENTIAL: the energy possessed or acquired by an object due to a change in its position when it is present in a gravitational field. In simple terms, it can be said that gravitational potential energy is an energy that is related to gravitational force or to gravity

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The DNA parts are identified as:

Genetic codes are nucleotide sequences in deoxyribonucleic acids (DNA) and ribonucleic acids (RNA) that determines the order of an amino acid which is the building block of proteins. It is a set of rules for translating information encoded genetic materials by living cells.

The part labelled A are called Nitrogen bases containing adenine and thymine, T pair, cytosine, C and guanine, G pair that are bound to form DNA while the Sugar phosphate backbone forms the structural base of the DNA and RNA.

The complete question is:

Use the drop-down menus to identify the parts of DNA.

Label A

Label B

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Answer: Label A is nitrogen bases

Label B is sugar phosphate backbone

Explanation:

[tex]density \: = \: mass \: over \: volume \\density \: 16grams \: over \: 7cm {}^{3} \\ density = 2.3g \cm {}^{3} [/tex]

Answer:

B.) 10.9 g

Explanation:

To find the mass of Mg(NO₃)₂, you need to (1) convert the volume from mL to L, then (2) calculate the amount of moles (using the molarity equation), and then (3) convert moles to grams (using the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.

(Step 1)

1,000 mL = 1 L

 183 mL                1 L
--------------  x  -----------------  =  0.183 L
                        1,000 mL

(Step 2)

Molarity = moles / volume (L)                   <----- Molarity equation

0.400 M = moles / 0.183 L                        <----- Insert variables

0.0732 = moles                                        <----- Multiply both sides by 0.183

(Step 3)

Atomic Mass (Mg): 24.305 g/mol

Atomic Mass (N): 14.007 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (Mg(NO₃)₂): 24.305 g/mol + 2(14.007 g/mol) + 6(15.999 g/mol)

Molar Mass (Mg(NO₃)₂): 148.313 g/mol

 0.0732 moles Mg(NO₃)₂             148.313 g
---------------------------------------  x  ---------------------  =  10.9 g Mg(NO₃)₂
                                                         1 mole

In business, it is crucial to keep costs low because when costs exceed the profits or income then the business runs out of cash and becomes bankrupt.

A cost is the worth of money that has been used up to create something or supply a service and is thus no longer accessible for use in production, research, retail, or accounting.

In business, the cost might be one of acquisition, in which case the money spent to obtain it is recognized as cost.

Businesses incur two sorts of expenses: fixed and variable costs. Variable costs change with production, but fixed costs do not. Overhead expenses are another term for fixed costs.

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The figures illustrate the law of multiple proportions because the empirical formulas of the two oxides are CO and [tex]CO_2[/tex] respectively.

The law of multiple proportions states that when two elements combine with each other to form more than one chemical compound, the weights of one element that combine with a fixed weight of the other are usually in small whole-number ratios.

The figures mentioned in the problems can be tested for agreement with the law of multiple proportions by finding the empirical formulas of the two oxides formed against a fixed weight of carbon:

The analysis of the first oxide is as follows:

C = 42.9

O = 100-42.9

   = 57.1

The equivalent mole of each atom will then be calculated by dividing each atom by their respective molar weights:

C = 12 g/mol

O = 16 g/mol

C = 42.9/12

  = 3.56

O = 57.1/16

   = 3.56

Thus, the empirical formula of the first oxide is CO.

The second oxide:

C = 27.3

O = 100 - 27.3

   = 72.7

The equivalent mole of each atom will be:

C = 27.3/12

  = 2.27

O = 72.7/16

   = 4.54

Dividing the moles by the smallest mole

C = 2.27/2.27

  = 1

O = 4.54/2.27

   = 2

Thus, the empirical formula of the second oxide is [tex]CO_2[/tex].

The first oxide gives CO while the second oxide gives  [tex]CO_2[/tex]. The weight of oxygen that combines with the fixed weight of carbon can be seen to be in simple whole-number ratios (1 and 2).

In other words, the figures quoted obeys the law of multiple proportions.

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The reaction given below shows a balanced incomplete combustion reaction:

B. 2 C₅H₁₂ + 11 O₂--> 10 CO + 12 H₂O

A combustion reaction is a reaction that involves substances reacting exothermically with oxygen to release large amounts of heat and light energy.

Hydrocarbons are compounds that contain only hydrogen and carbon.

Hydrogen combusts completely in oxygen to produce carbon(iv) oxide and water.

However, the incomplete combustion of hydrocarbons produces carbon (ii) oxide and water instead carbon(iv) oxide and water.

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Atom consists of electron, proton and neutron.  The number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Mass number =Number of neutrons+ number of protons

Mass number =55

Number of neutrons=atomic number+5

Substituting the given values in the above formula

55 =atomic number+5+ number of protons

50=2×atomic number

Atomic number=25

Therefore, the number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

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The internal energy of a human body is the net energy contained in the body due motion of its particle or molecules.

In a human body the internal energy is stored . It increases when the temperature of the body rises, or when the body observes some changes. Internal energy we can say that is the sum of kinetic and potential energy of all particles in the body.

Internal energy is a state function of a system and is an extensive quantity. Every substance possesses a fixed quantity of energy which depends upon  its chemical nature and also on its state of existence. Every substance have a definite value of Internal energy.

The change in the Internal energy of a reaction may be considered as the difference between the internal energies of the two states.

ΔU = [tex]E_{B}[/tex] - [tex]E_{A}[/tex]     where [tex]E_{B}[/tex] and [tex]E_{A}[/tex] are the initial energies of states A and B. Or we can also write the equation as:

ΔU = ΔE

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The partial pressure of nitrogen gas in 2L sample of gas 1 and gas 2 are equal.

The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture, according to Dalton's law of partial pressures, a gas law.

P'=X° ×Pt ( P' = partial pressure , Xi = mole fraction , Pt= Total pressure )

Gas 1  ( ∵1 mole of gas = 22.4L)

Nitrogen moles = 80% × 2L / 22.4L

=8/5x22.4L

Oxygen moles = 20% ×2L /22.4L

2/5 × 22.4l

Mole fraction of nitrogen =  (8/5 ×22.4L) ÷ (8/5 ×22.4L+ 2/5x22.4L)

=4/5

Partial pressure of nitrogen at 1 atm = 4/5 * 1

=4/5

Similarly Gas 2

Nitrogen moles = 80% × 2L / 22.4L

=16/10 × 22.4L

Oxygen moles = 15%  × 2L /22.4L

3/10 × 22.4l

Carbon dioxide moles = 5% × 2L /22.4L

1/10 × 22.4L

Mole fraction of nitrogen =  (16/10 × 22.4L) ÷ (16/10 ×22.4L+ 3/10x22.4l + 1/10X22.4L) = 4/5

Partial pressure of nitrogen at 1 atm = 4/5 * 1

=4/5

Hence, partial pressure of nitrogen in gas 1 and gas 2 are equal.

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The maximum number of dots an electron dot diagram can have is 8.

The maximum number of dots drawn on the side of a chemical symbol in an electron dot diagram is 2.

The electron dot diagrams is otherwise known as Lewis electron dot diagrams, Lewis structure, or simple Lewis diagram. It is a diagrammatic representation of the valence electrons of atoms using dots to represent electrons around the symbols of atoms.

The valence electron of an atom is the number of electrons present in the outermost shell of the atom. According to the rules, the first shell of an atom can take a maximum of 2 electrons while the remaining shells can take a maximum of 8 electrons each.

Atoms with 8 electrons in their outermost shells are said to be in an octet state.

The number of dots an atom will have around it will, therefore, depend on the number of valence electrons it has.  As a rule of thumb, each side of an atom can take a maximum of 2 electrons. Thus, an atom with 8 valence electrons will have 2 dots each on its 4 sides.

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Answer:

the first is 8 an the second one is 2

Explanation:

The empirical formulae of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.

given that :

mass of potassium , K = 5.85 g

molar mass of potassium = 39 g/mol

mass of nitrogen , N = 2.10 g

molar mass of nitrogen = 14

mass of oxygen , O = 4.80 g

molar mass of oxygen = 16

now, we have calculate the number of mole for each atom :

number of moles of potassium , K = mass / molar mass

                                                         = 5.85 / 39

                                                         = 0.15 mol

number of moles of nitrogen , N = 2.10 / 14

                                                      = 0.15 mol

number of moles of oxygen , O = 4.80 / 16

                                                     = 0.3 mol

now, dividing by the smallest one , we get

moles of K = 0.15 / 0.15 = 1

moles of N = 0.15 / 0.15 = 1

moles of O = 0.3 / 0.15 = 2

The empirical formula = KNO₂

Thus, The empirical formula of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.

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Yes, this replacement reaction 3Ca + Au₂S₃ → 3CaS + 2Au.

A replacement reaction occurs when elements switch places in compounds. This type of reaction involves ions.

Generally, more reactive elements replace less reactive elements. A single replacement reaction occurs when one element replaces another element in one compound.

A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound. The starting materials are always pure elements, such as a pure zinc metal or hydrogen gas, plus an aqueous compound.

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