Chemical Reactions Quiz

A reaction was predicted to produce 32.4 grams of a compound. When the product was measured in the lab, there were only 26.1 grams produced. What is the percent yield of the reaction?

• 80.6%

• 6.3%

• 24.1%

• 58.5%

Tags

NGSS.HS-PS1-7

Which term describes the number of particles in 1 mole of a substance?

• Avogadro’s number

• Dalton’s number

• Lavoisier’s number

• Boyle’s number

In a balanced equation, the mole ratio of two reactants is determined from the ______________.

• volume of each reactant

• liters of each reactant

• number of grams of each reactant

• number of atoms in each reactant

• coefficient for each reactant

Tags

NGSS.HS-PS1-7

In a chemical reaction, the total mass of the products compared to the total mass of reactants is _______.

• always equal

• always smaller

• always larger

• never the same

Tags

NGSS.HS-PS1-7

What is the term that represents the sum of the atomic masses of the atoms in 1 mole of a compound?

• atomic weight

• relative mass

• density

• molar mass

The amount of product that should be produced based on stoichiometric calculations is the _______.

• actual yield

• theoretical yield

• percent yield

• minimum yield

Tags

NGSS.HS-PS1-7

The limiting reactant in a completed chemical reaction will be the substance ________________.

• left over

• used up

• with the greatest mass before the reaction begins

• with the least mass before the reaction begins

Tags

NGSS.HS-PS1-7

What is the term for the reactant that determines the amount of product formed in a chemical reaction?

• Secondary reactant

• Primary reactant

• Limiting reactant

• Excess reactant

Tags

NGSS.MS-PS1-5

How many liters of oxygen gas at STP are produced from the decomposition of 50 grams of potassium chlorate (KClO₃)?

• 10.0 L

• 15.2 L

• 13.6 L

• 11.2 L

Tags

NGSS.HS-PS1-7

What volume of carbon dioxide gas at STP is produced from the combustion of 44 grams of propane (C₃H₈)?

• 44.8 L

• 67.2 L

• 22.4 L

• 89.6 L