When an electron in a quantum system drops from a higher energy level to a lower one, the system emit a photon.
The energy of the electron drops when it transitions levels, as well as the atom releases photons. The emission of the photon occurs as the electron transitions from an energy state to a lower state. The photon energy represents precisely the energy that would be lost when an electron moves to a level with less energy.
When such an excited electron transitions from one energy level to another, this could emit a photon. The energy drop would be equivalent to the power of the photon that is released. In electron volts, the energy of an electron, as well as its associated photon (emitted or absorbed) has been stated.
Therefore, when an electron in a quantum system drops from a higher energy level to a lower one, the system emit a photon.
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One means of enriching the percentage of uranium-235 for use as nuclear fuel is _____. group of answer choices
Uranium,means of enriching the percentage of uranium-235 for use as nuclear fuel. The most popular fuel for nuclear fission in nuclear power plants is uranium. A specific variety of uranium, U-235, is used as fuel in nuclear power reactors because its atoms are simple to separate.
U-235, which makes up little over 0.7% of natural uranium while being nearly 100 times more prevalent than silver, is relatively uncommon.Commercially, the U235 isotope is processed further to produce nuclear fuel after being enriched to 3 to 5% (from its native form of 0.7%).
Uranium oxide is transformed at the conversion facility into uranium hexafluoride (UF6), which can then be used in enrichment facilities. Low enriched uranium (LEU) fuel, which is used in the majority of nuclear power plants' light water reactors, can be replaced by MOX fuel.
The most popular fuel for nuclear fission in nuclear power plants is uranium. A specific variety of uranium, U-235, is used as fuel in nuclear power reactors because its atoms are simple to separate. U-235, which makes up little over 0.7% of natural uranium while being nearly 100 times more prevalent than silver, is relatively uncommon.
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A solution is made by dissolving 6.93 grams of lead(II) nitrate into about 50 mL of water. The volume is then precisely brought up to 100 mL and the solution is saved as stock solution. A 50.0 mL aliquot* of this stock solution is then titrated with 0.222 M sodium phosphate. What would be the minimum number of milliliters (mL) of the the phosphate solution that are needed to completely precipitate (knock out) all the lead in this aliquot? (tolerance is ±0.1 mL)
6.32mL of phosphate solution is needed to completely neutralize the lead in this reaction.
What is a neutralization reaction?A neutralization reaction is defined as the reaction between an strong acid and strong base to produce a salt and water.
The process of the reacting given volume of acids or bases for the determination of the concentration or volume of the acid or base which is required for neutralization is known as titration in volumetric analysis.
The formula used to determine the volume of the acid is given below:
(Ca × Va) /(Cb × Vb) = Na/Nb
where,
where Ca is the concentration of lead nitrate
Cb is the concentration of sodium phosphate
Va is the volume of lead nitrate
Vb is the volume of sodium phosphate
Na is the moles of lead nitrate
Nb is the moles of sodium phosphate
Concentration of lead nitrate = m/V
= 6.931/(0.1 × 331.2)
= 0.0281 M
Ca = 0.222M
Cb = 0.0281M
Na = Nb = 1
Va = ( 0.0281 × 50) /0.222
= 6.32 mL.
Thus, 6.32mL of phosphate solution is needed to completely neutralize the lead in this reaction.
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If a buffer is composed of 34. 63 ml of 0. 139 m acetic acid and 36. 50 ml of 0. 182 m sodium acetate, how many ml of 0. 100 m hcl can be added before the buffer capacity is reached?
The volume is the product of the molar concentration and the moles of the substance. The volume of hydrochloric acid that can be added to the buffer is 0.066 L.
What is a buffer?A buffer is a constant solution with a proton or hydrogen ion concentration with an acid, base, or salt dissolved in them.
The chemical reaction between hydrochloric acid and sodium acetate is given as,
HCl + CH₃Coo-Na → CH₃CooH + NaCl
From above the initials moles of acetic acid are given as,
Moles = molarity × volume
= 0.139 M × 0.0346 L
= 0.0048 moles
The initials moles of sodium acetate are given as,
M = 0.182 M × 0.0365 L
= 0.0066 moles
As it is known that the ratio of the buffer capacity is 10 for sodium acetate and acetic acid so,
Moles sodium acetate ÷ Moles Acetic acid = 10
(0.0066 moles + X) ÷ (0.0048 moles - X) = 10
Here, X is the moles of HCl and is calculated as,
0.0066 moles + X = 0.048 moles - 10X
11 X = 0.048 ÷ 0.0066
11 X = 7.27
X = 0.66 moles
The volume of 0.100 HCl with 0.66 moles is:
Volume = moles × molarity
= 0.100 × 0.66
= 0.066 L
Therefore, 0.066 L of 0.100 M HCl is required to reach the buffer capacity.
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Why are salt and sugar both able to dissolve in water, even though the solutes have different types of chemical bonding?.
The polar water molecules attract the oppositely assessed polar areas of the sucrose molecules and pull them away, resulting in dissolving. Since the ions in salt and the molecules in sugar are very different, their solubilities tend to be additional.
What is chemical bond?A chemical bond is a continuing attraction between atoms, ions, or molecules that promotes the formation of chemical mixtures. The bond may result from the electrostatic significance between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.A chemical bond is what holds atoms concurrently in molecules. Bonds arise from the electrostatic energies between positively charged atomic nuclei and negatively charged electrons (the functions of which in space are determined by quantum mechanics).A chemical bond is a point of attraction between atoms or ions. Bonds form when atoms share or transmit valence electrons. Valence electrons are the electrons in the outer significance level of an atom that may be interested in chemical relations. Valence electrons are the basis of all chemical bonds.To learn more about chemical bond, refer to:
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Calculate the number of molecules present in 3.4 moles of Ammonia (NH3) [At No. N=7, H=1]
The 3.4 moles of Ammonia (NH₃) have 2.0475 x 10²⁴ molecules of it.
What is a Mole?A mole is a unit used to count the elementary particles such as atoms, molecules, or ions of a substance.1 mole has a fixed value that is 6.022 x 10²³ of something and is known as Avogadro’s number. Avogadro’s number is represented by [tex]N_A[/tex]For example, a mole of hydrogen atom means 6.022 x 10²³ atoms of hydrogen and one mole of hydrogen molecule (H₂) is equal to 6.022 x 10²³ molecules of hydrogen which also means 2 x 6.022 x 10²³ atoms of hydrogen.How to calculate the number of molecules of an atom?We know,
The number of moles is given by
[tex]n =\frac{m}{M}[/tex]
The number of molecules is the product of a number of moles and Avogadro's number[tex]N_A[/tex]
Number of molecules of NH₃ = [tex]n \times N_A[/tex]
= 3.4 x 6.022 x 10²³
= 2.0475 x 10²⁴ molecules
Hence, 3.4 moles of Ammonia have 2.0475 x 10²⁴ molecules
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chlorine + sulfur dioxide + water = hydrochloric acid + sulfuric acid
The given example is a chemical reaction.
The contents (separated as reactants and products) :
[tex]\begin{tabular}{c | l}Reactants & Products \\\cline{1-2}Chlorine & Sulfuric Acid \\Water & Hydrochloric Acid \\Sulfur Dioxide & \\\end{tabular}[/tex]
The written reaction is :
[tex]\boxed {Cl + SO_{2} + H_{2}O \implies HCl + H_{2}SO{4}}[/tex]
I hope it helped you solve the problem.
Good luck on your studies!
The condition of acidosis can cause ____________ because the higher h concentration diffuses to the icf, pushing k towards the ecf
Acidosis is a disorder in which there is excess acid in the body. This condition can lead to hyperkalemia due to the diffusion of hydrogen ions in the intracellular fluid.
What is hyperkalemia?Hyperkalemia is an increased concentration of the fluid potassium level than normal. Though potassium (K) is needed by the body for various functions of the nervous system and muscles their excess can lead to diseases.
It can also be caused by acidosis, where the concentration of the hydrogen ion increases in the intracellular fluid which leads to a large movement of potassium ions toward the extracellular fluid.
Therefore, the condition of acidosis can cause hyperkalemia.
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What volume (ml) of fluorine gas is required to react with 1. 28 g of calcium bromide to form calcium fluoride and bromine gas at stp?
144 mL of fluorine gas is required to react with 1.28 g of calcium bromide to form calcium fluoride and bromine gas at STP.
What is Ideal Gas Law ?The ideal gas law states that the pressure of gas is directly proportional to the volume and temperature of the gas.
PV = nRT
where,
P = Presure
V = Volume in liters
n = number of moles of gas
R = Ideal gas constant
T = temperature in Kelvin
Here,
P = 1 atm [At STP]
R = 0.0821 atm.L/mol.K
T = 273 K [At STP]
Now first find the number of moles
F₂ + CaBr₂ → CaF₂ + Br₂
Here 1 mole of F₂ reacts with 1 mole of CaBr₂.
So, 199.89 g CaBr₂ reacts with = 1 mole of F₂
1.28 g of CaBr₂ will react with = n mole of F₂
[tex]n = \frac{1.28\g \times 1\ \text{mole}}{199.89\ g}[/tex]
n = 0.0064 mole
Now put the value in above equation we get
PV = nRT
1 atm × V = 0.0064 × 0.0821 atm.L/mol.K × 273 K
V = 0.1434 L
V ≈ 144 mL
Thus from the above conclusion we can say that 144 mL of fluorine gas is required to react with 1.28 g of calcium bromide to form calcium fluoride and bromine gas at STP.
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Liquid acetaminophen for children is labeled 180 mg 3 ml. what is the strength expressed as grams per ml?
Liquid acetaminophen for children is labeled 180 mg 3 ml. The strength expressed as grams per ml is 0.060.
What is acetaminophen?
Acetaminophen is a medicine that is used to treat all kind of pains. Headache, menstrual pain, stomach ache, etc. It also used to reduce fever and cold/cough.
Liquid acetaminophen for children is labeled as 180 mg/ 3ml
The 180 mg will be divided by 3 ml
180 mg/ 3ml = 60 mg/ml
The amount will be multiplied by 1 /1000 to get the quantity equal.
60 mg/ml x 1g / 1000 g
60 x 1/ 1000 mg/ml = 0.060
Thus, the strength expressed as grams per ml is 0.060.
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Write an equation that gives the relationship between the cross-sectional area (a), the volume (v), and the thickness of a cylinder.
What is the molar mass of aluminum sulfate? 278.0 g/mol 315.2 g/mol 306.2 g/mol 123.0 g/mol 342.2 g/mol
The molar mass of aluminum sulfate is 342.2 g/mol.
The molar mass of aluminium sulfate Al₂(SO₄)₃, will be equal to the sum of the molar masses of all the atoms that make up a mole of this compound.
From (Al₂(SO₄)₃, 1 mole of aluminum sulfate contains;
two moles of aluminum, 2xAl
three moles of sulfur, 3xS
twelve moles of oxygen, 3x4x0
From periodic table, the molar mass of aluminum, sulfur and oxygen is;
Al= 26.981538 g mol⁻¹
S= 32.065 g mol⁻¹
O=14.9994 g mol⁻¹
To find molar mass of aluminum sulfate we need to do
2xMmAl+3xMmS+12XMmO
2X26.981538 g mol⁻¹+3X32.065 g mol⁻¹+12X15.9994 g mol⁻¹
This will give Mm Al₂(SO₄)₃ = 342.150876 g mol⁻¹
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1. There are 42 grams of sugar (C12H22O11) in a can of pop (342mL). Use this information (where necessary) to answer the following questions:
a) How many moles of sugar are there in the pop (3 marks)?
b) If a mole of sugar costs 90 cents, what is the value of the sugar in a can of pop (3 marks)?
c) How many particles of sugar are there in the pop (3 marks)?
The number of sugar particles is 7.4 * 10^22 particles.
What is the mole?The mole is used to describe the amount of substance. The idea was first introduced by Professor Avogadro and the number of particles that constitute one mole of a substance was said to be 6.02 * 10^23 particles in a mole.
Thus;
Molar mass of sugar = 342 g/mol
Number of moles of sugar = 42 grams/342 g/mol = 0.123 moles
Now;
If 1 mole of sugar costs 90 cents
0.123 moles of sugar costs 0.123 moles * 90 cents/1 mole
= 11 cents
Now we know that;
1 mole of sugar contains 6.02 * 10^23 particles
0.123 moles of sugar contains 0.123 moles * 6.02 * 10^23 particles / 1 mole
= 7.4 * 10^22 particles
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Identify the location of reduction in an electrochemical cell. group of answer choices the electrode the anode the socket the cathode the salt bridge
The location of reduction in an electrochemical cell is called the anode.
An electrochemical cell ( galvanic cell ) is generate electric energy from chemical reactions. In galvanic cell species ( for example zinc and zinc cations ) from one half-cell lose electrons ( oxidation ) and species from other half-cell ( for example copper and copper cations ) gain electrons ( reduction ). Electric current is generated due to the flow of electrons from the anode that undergoes an oxidation reaction to the cathode which has a reduction reaction in the circuit of an outer wire circuit.
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What are the products of hydrolysis when the polypeptide is treated with chymotrypsin?
The products of hydrolysis when the polypeptide is treated with chymotrypsin are endo-peptidases.
What is chymotrypsin?Chymotrypsin is a digestive enzyme that breaks down protein in the form of small intestine .This enzyme is a substance that speeds up certain chemical reactions in the body.
A digestive enzyme is a specialized protein that breaks down the substances in the digestive tract by catalyzing biochemical reactions.
The chymotrypsin active site consists of aspartic acid, serine, and histidine amino acid residues.
Chymotrypsin works primarily due to its hydrophobic pocket in the active site.
Products of hydrolysis when the polypeptide is treated with chymotrypsin are endo-peptidases.
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A 0. 150 amp current is run through a solution of ni2 ions for 12. 2 hours. what mass of metal is deposited on the cathode?
The mass of nickel metal deposited on the cathode is 2.004 g.
What is electrolysis?When an ionic compound is decomposed into its elements by passing a direct electric current using a compound in its liquid form. The process is known as electrolysis.
At the cathode, cations are reduced and at the anode, anions are oxidized.
The main components used in the process of electrolysis are
electrolyte, electrodes,external power sourceCurrent passed through the solution, I = 0.150 A
Time, t = 12.2 hrs = 12.2×60×60 = 43920 sec
Charge, q = It = 0.150 × 43920 = 6588 C
At cathode,
[tex]Ni^{2+}(aq) + 2e^- \rightarrow Ni(s)[/tex]
Nickel metal deposited by (2×96487 C) = 58.7g
Nickel metal deposited by 6588 C = [tex]\frac{58.7 \times 6588 }{2\times96487}[/tex] = 2.004 g
Hence, The mass of nickel metal deposited on the cathode is 2.004 g.
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How many half-lives have passed in a sample that originally contained 5000 parent isotopes but now has only 625?
Answer:
3 half lives
Explanation:
5000 * (1/2)^n = 625 where n = number of half lives
log ( 625/5000) / log(1/2) = n = 3
5000 2500 1250 625
what is the freezing point, in C, of a 2.75 m solution of C8H18 in benzene?
The freezing point of benzene is 14.08°C.
What is freezing point?The temperature at which the liquid and solid states of the substance are in equilibrium at atmospheric pressure.
Calculation
The equation which give relation between freezing point depletion and molality is,
[tex]\Delta T_{f} = K_{f} \times m[/tex]
where,
[tex]\Delta T_{f}[/tex] = change in the freezing point of the solvent.
[tex]K_{f}[/tex] of benzene = 5.12°C/m (given)
M is molality of the solution = 2.75 M
Now, after putting the value in above formula we get
[tex]\Delta T_{f} = K_{f} \times m[/tex]
[tex]\Delta T_{f} = 5.12 \times 2.75[/tex]
= 14.08°C
Thus from the above conclusion we can say that The freezing point of benzene is 14.08°C.
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Answer:
-8.58
Okay, im having trouble with the question too and the answer i types was wrong, so i went to omnicalculator instead and got this answer which was right. :')
A mixture of three gases, A, B and C, is at a total pressure of 6.11 atm. The partial
pressure of gas A is 1.68 atm; that of gas B; is 3.89 atm. What is the partial pressure
of gas C?
2.13 atm
2.21 atm
5.57 atm
0.54 atm
The partial pressure of gas C is 0.54atm. The correct option is D.
What is partial pressure?The pressure that one of the gases in a mixture would exert if it were in the same volume on its own.
The total pressure of A, B and C is 6.11 atm.
The partial pressure of A is 1.68 atm
The partial pressure of B is 3.89 atm.
Total pressure = sum of partial pressures of all the gasses in that mixture
6.11atm = 1.68atm + 3.89atm + Pc
Pc = 6.11atm - (1.68 + 3.89) = 0.54atm
Thus, the partial pressure of C is 0.54atm. The correct option is D.
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2C6H6(g) + 15O2(g) = 12CO2(g) + 6H2O(g)
2.0 moles C6H6 reacts with oxygen according to the reaction above. What volume of water vapor forms at STP?
At STP, the volume of water that is produced is 134.4 L.
What is the volume?Now we know that the equation of the reaction is;
2C6H6(g) + 15O2(g) = 12CO2(g) + 6H2O(g)
We can use the stoichiometry of the reaction to determine the volume of the water produced as follows;
2 mole of C6H6 produced 6 moles of water. If 1 mole of water occupies 22.4 L then 6 moles of water will occupy 6 * 22.4 L = 134.4 L
Thus, we can see that at STP, the volume of water that is produced is 134.4 L.
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Identify the reactants and the products in this chemical equation. 2fe2o3 3c → 4fe 3co2
Answer:
Reactants: Fe₂O₃ and C
Products: Fe and CO₂
Explanation:
The reactants are the molecules that undergo changes in a reaction.
The products are the molecules which are made during a reaction.
The reactants are on the left side of the arrow and the products are on the right side of the arrow. Therefore.....
The chemical reaction:
2 Fe₂O₃ + 3 C -----> 4 Fe + 3 CO₃
Reactants: Fe₂O₃ and C
Products: Fe and CO₂
According to the iupac convention, alkyl substituents on a hydrocarbon chain should be listed in which order?
According to the iupac convention, alkyl substituents on a hydrocarbon chain should be listed in alphabetical without taking prefixes into name.
A hydrocarbon would be an organic molecule in organic chemistry that is made completely of hydrogen as well as carbon. A good example of group 14 hydrides includes hydrocarbons. In general, hydrocarbons lack color and are hydrophobic. Typically, their faint smells are compared to that of gasoline and lighter fluid.
The longest unbroken carbon chain should be found and named.Name the groups that make up this chain but instead identify them.Beginning at the end of the chain closest to a substituent group, fraction the chain sequentially.Give each substituent group a corresponding number but also name to indicate its placement.Therefore, according to the iupac convention, alkyl substituents on a hydrocarbon chain should be listed in alphabetical without taking prefixes into name.
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What concentration of the barium ion, ba2 , must be exceeded to precipitate baf2 from a solution that is 1. 00×10−2 m in the fluoride ion, f−? ksp for barium fluoride is 2. 45×10−5
The amount of barium ions that must be present in order for the salt to precipitate is 0.245 M.
A solution's solubility product is the result of raising each ion's concentration to the power of its stoichiometric ratio. It is portrayed as
A combination of 1 barium ion and 2 fluoride ions results in the ionic compound known as barium fluoride.
The following equation describes the equilibrium reaction for barium fluoride ionization:
BaF₂ → Ba²⁺ + 2F⁻
Ksp = [Ba²⁺] · [F⁻]²
2.45*[tex]10^{-5}[/tex]= [Ba²⁺] * [tex][1. 00*10^{-2} ]^{2}[/tex]
[Ba²⁺]=0.245 M
As a result, 0.245 M of barium ions must be present in order for the salt to precipitate.
SolubilitySolubility in chemistry refers to a chemical's capacity to dissolve in another substance, the solvent, to produce a solution. Inability of the solute to create such a solution is the opposite quality, or insolubility. A substance's degree of solubility in a given solvent is often determined by the amount of the solute present in a saturated solution, which is a solution in which no additional solute can be dissolved. The solubility equilibrium between the two compounds is considered to have been reached at this time. If there is no such restriction for a given solute and solvent, the two are referred to as being "miscible in any amounts."
What concentration of the barium ion, ba2 , must be exceeded to precipitate baf2 from a solution that is 1. 00×10−2 m in the fluoride ion, f−? ksp for barium fluoride is 2. 45×10−5
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The nuclear reactor in Japan had an accident in 2011 when it was hit by an earthquake. The reactor exploded and released a great deal of damaging radiation. Where did the energy for the explosion come from?
A. The nucleus of an atom.
B. The nucleus of a cell.
C. The radiation waves.
D. The radiation particles.
The nuclear reactor in Japan had an accident in 2011 when it was hit by an earthquake. The reactor exploded and released a great deal of damaging radiation. The energy for the explosion comes from option(a) i.e, The nucleus of an atom.
An explosion is a sudden increase in volume accompanied by a very strong energy release that usually results in the production of high temperatures and the release of high-pressure gases. High explosive detonations produce supersonic explosions that move through shock waves.
The 2011 Tohoku earthquake and tsunami, which occurred on March 11, 2011, and was the most violent earthquake ever recorded in Japan, were the direct causes of the nuclear tragedy. The nuclear power facility was damaged by the strong tsunami that the earthquake caused, which had waves that were 13 to 14 meters high.
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Draw the major product formed in the reaction involving an acid anhydride dissolved in alcohol.
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Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions
book for this test.
Which series of atomic numbers represents the ordering of consecutive elements within the periodic table?
O 1, 2, 3, 4, ...
O 1, 3, 5, 7, ...
O 10, 20, 30, 40, ...
O 2, 4, 8, 16, ...
The sequence of atomic numbers 1, 2, 3, and 4 denotes the periodic table's ordering of following elements.
What purpose do series serve?Series are significant because they offer a possible point of entry. It's possible for a user to merely be aware of the fact that a publication is part of a specific series or to be searching for all publications in that series without being aware of any of the individual titles. The series could potentially be used as a storage and control system.
A series element is what?There are two ways to recognize elements in a series: The elements are in series if there are two and only two connections between them and a single node. When two elements' currents are determined to be similar by KCL at a node, the elements are in series.
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A doubly charged ion with velocity 6. 9 × 106 m/s moves in a path of radius 30 cm in a magnetic field of 0. 80 t in a mass spectrometer. what is the mass of this ion?
The mass of this ion is 1.16*10^-26kg.
To find the answer, we have to know about the force acting on a particle circulating in a uniform magnetic field.
How to find the mass of this ion?Let us consider that, a particle of mass m with charge q moving with velocity v in a circular orbit of radius r, then the centripetal force of it's path will be equal to the Lorentz magnetic force.[tex]F_c=F_B\\\frac{mv^2}{r} =qvB\\[/tex]
Thus, the mass of the doubly charged ion will be,[tex]m=\frac{qBr}{v} =\frac{2*1.67*10^{-19}*0.8*30*10^{-2}}{6.9*10^6} \\m=1.16*10^{-26}kg[/tex]
Thus, we can conclude that, the mass of this ion is 1.16*10^-26kg.
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What mass of kcl in grams must be added to 500 ml of a 0. 15 m kcl solution to produce a 0. 40 m solution.
91.4 grams mass of KCl is required.
Concentration = moles/Volume
2.45M=mol/0.5L
2.45M⋅0.5L=mol
mol=1.225
Convert no. of moles to grams using the atomic mass of K + Cl
1.225mol⋅(39.1+35.5)/gmol
1.225mol⋅74.6g
mol=1.225⋅74.6g = 91.4g
What is Concentration?The formula for determining concentration from moles and volume is pretty straightforward. Simply divide the volume of solution by the moles of solute.The number of moles of a component divided by the sum of the moles in the solution is what is known as a mole fraction, which is a unit of concentration. Mole fraction is a unit-free expression because it represents a ratio.To learn more about concentrations, refer to the given link:
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What type of reactive intermediate is formed in the reaction of an alkene with br2 and water?
Cyclic bromonium ion is the reactive intermediate that is formed in the reaction of an alkene with br2 and water. the correct answer is option(d).
A reactive intermediate is a highly reactive, high-energy, brief-lived molecule that, when produced in a chemical reaction, will swiftly transform into a stable molecule. They may occasionally be divided and stored. For instance, low temperatures and Matrix Isolation. Carbocations, carbanions, free radicals, carbenes, nitrenes, and benzyne are six different categories of reaction intermediates. These intermediaries are frequently produced when a chemical substance is chemically broken down.
Reactive intermediates can be used to explain the process of a chemical reaction. Reactive intermediates are high-energy, stable products that are present only in one of the intermediate phases of most chemical reactions, which typically involve more than one elementary step.
The complete question is:
What type of reactive intermediate is formed in the reaction of an alkene with Br2 and water to give a bromohydrin?
a.carbocation
b.carbanion
c.radical
d.cyclic bromonium ion
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8.0 liters I2 forms at STP. How many moles of KI were required for the reaction?
Answer:
0.71 moles KI
Explanation:
At STP, there should be 1.0 moles at 22.4 L. However, there are only 8.0 L of I₂. Therefore, we must set up a proportion to find the correct moles of I₂.
[tex]\frac{1 mole}{22.4 L} =\frac{? moles}{8.0 L}[/tex] <----- Proportion
[tex]8.0 = 22.4(? moles)[/tex] <----- Cross multiply
[tex]0.36 = ? moles[/tex] <----- Divide both sides by 22.4
To find the moles of KI, you can use the mole-to-mole ratio from the balanced equation coefficients. The final answer should have 2 sig figs.
2 KI(aq) + Cl₂(g) ---> 2KCl(aq) + 1 I₂(g)
^ ^
0.36 moles I₂ 2 moles KI
---------------------- x -------------------- = 0.71 moles KI
1 mole I₂
Answer: 0.71 moles KI
Explanation:
How many valence electrons are present in the lewis formula for the perchlorate ion, cl4-?
a. 30
b. 38
c. 34
d. 36
e. 32
The valence electrons are present in the lewis formula for the perchlorate ion will be 32.
The electrons in such an atom's outermost atomic shell known as the valence electrons may be those that orbit the nucleus. Core electrons are mostly in filled orbitals some of which are located closest to the nucleus.
The formula of perchlorate ion is [tex]ClO^{-} _{4}[/tex].
The valence electrons of Cl is 7 and the valence electrons of oxygen is 6 , one negative charge . By adding the total valence electron, it will be 32.
The valence electrons are present in the lewis formula for the perchlorate ion will be 32.
Hence, the correct answer will be option (e).
To know more about valence electrons
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