Chapter 9: Stoichiometry

A balanced chemical equation allows one to determine the

• mole ratio of any two substances in the reaction

• energy released in the reaction

• electron configuration of all elements in the reaction

• mechanism involved in the reaction

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NGSS.HS-PS1-7

The coefficients in a chemical equation represent the

• masses, in grams, of all reactants and prodcuts

• relative numbers of moles of reactants and products

• number of atoms in each compound in a reaction

• number of valence electrons involved in the reaction

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NGSS.HS-PS1-7

Actual yield must be determined by

• experiments

• calculations

• theoretical yield

• estimation

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NGSS.HS-PS1-7

The actual yield of a chemical reaction is generally

• less than the theoretical yield

• greater than the theoretical yield

• equal to the percentage yield

• greater than the percentage yield

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NGSS.HS-PS1-7

How many mole ratios can be correctly obtained from the chemical equation

2Al₂O₃ → H₂ + Cl₂?

• 3

• 4

• 6

• 8

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NGSS.HS-PS1-7

Which expression can be used to solve a mass-to-mole conversion for the equation 2HCl → H₂ +Cl₂?

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NGSS.HS-PS1-7

In the equation 2Al₂O₂ → 4Al + 3O₂, what is the mole ratio of aluminum to oxygen?

• 10:6

• 3:4

• 2:3

• 4:3

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NGSS.HS-PS1-7

Fewer steps are required to solve stoichiometry problems when

• the reactant is given in grams and the product is sought in grams

• the reactant is given in moles and the product is sought in moles

• the reactant is given in grams and the product is sought in liters

• the reactant is given in liters and the product is sough tin number of atoms

Tags

NGSS.HS-PS1-7

Which of the following mathematical expressions correctly states the relationship among percentage yield, actual yield, and theoretical yield?

• both (b) and (c)

The participation of reactants in a chemical reaction is restricted by the

• limiting reactant

• limiting product

• excess reactant

• excess product