Chemistry Stoichiometry Percent Yield

In stoichiometry, chemists are mainly concerned with

• mole and mass relationships in chemical reactions.

• the types of bonds found in compounds.

• energy relationships in chemical reactions.

• the speed with which chemical reactions occur.

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NGSS.HS-PS1-7

If a chemical reaction involving substance A and B stops when substance B is completely used up, then substance B is referred to as the

• excess reactant.

• limiting reactant.

• primary reactant.

• primary product.

In most chemical reactions the amount of product obtained is

• more than the theoretical yield.

• equal to the theoretical yield.

• more than the percent yield.

• less than the theoretical yield.

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NGSS.HS-PS1-7

The coefficients in a chemical equation represent which type of ratio?

• mass to mass ratio

• mole to mole ratio

• mass to mole ratio

• mole to mass ratio

If % yield is 100% then which of the following is true?

• actual yield is greater than theocratical yield

• actual yield is less than theocratical yield

• actual yield is equal to theocratical yield

• there is no limiting reactant

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NGSS.HS-PS1-7

Which of the following would be investigated in reaction stoichiometry?

• the types of bonds that break and form when acids reacts with metals

• the mass of potassium required to produce a known mass of potassium chloride

• the amount of energy released in chemical reactions

• the mass of hydrogen and oxygen in water

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NGSS.HS-PS1-7

• #1 only

• #2 only

• #3 only

• #2 and #3 only

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NGSS.HS-PS1-7

• 1 : 1

• 2 : 3

• 1 : 3

• 1 : 2

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NGSS.HS-PS1-7

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NGSS.HS-PS1-7

Potassium chlorate decomposes to potassium chloride and oxygen. Using 6.68 mg of the starting material, what is the theoretical yield of potassium chloride (in grams)?

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NGSS.HS-PS1-7