Chemistry Quiz 09 (Ch 9)

Reaction stoichiometry is based on chemical equations and

• the law of conservation of mass.

• the ideal gas law.

• the law of conservation of momentum.

• Avogadro’s number.

Molar mass can be used to relate

• mass of reactant to moles of reactant.

• moles of product to mass of product.

• mass of product to moles of product.

• All of the above

In the chemical reaction described by the equation 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s), the mole ratio of iron(III) oxide to iron is

• 1:1

• 2:4

• 2:3

• 4:1

In the chemical equation wA + xB → yC + zD, if you know the number of moles of A that react, you can determine

• the number of moles of each reactant and product.

• the number of moles of B only.

• the total number of moles of C and D only.

• the total number of moles of A and B only.

Molar masses are determined from

• the mole ratio of a given amount of reactant to an unknown amount of product.

• the periodic table.

• any mole ratio in the problem.

• a conversion factor.

The number of conversion factors needed to solve a mass-to-mass stoichiometry problem is

• 1

• 2

• 3

• 4

The conversion factor used to convert from moles to grams is

• inverted molar mass.

• molar mass.

• mole ratio.

• inverted mole ratio.

If, in the reaction A + B → C + D, the quantity of B is insufficient to react with all of A,

• A is the limiting reactant.

• B is the limiting reactant.

• Both are limiting reactants

• Neither are limiting reactants

The measured amount of product obtained from a chemical reaction is the

• percentage yield.

• theoretical yield.

• actual yield.

• mole ratio.

The efficiency of a chemical reaction is best expressed by the

• actual yield.

• theoretical yield.

• percentage yield.

• actual yield + theoretical yield.