Limiting Reactant Quiz

What is a limiting reagent in a chemical reaction?

• The reactant that is completely consumed and determines the amount of product formed.

• The reactant that is left over after the reaction is complete.

• The catalyst that speeds up the reaction.

• The product that forms in the largest quantity.

In the reaction 2mol H₂+ 1mol O₂→2mol H₂O, if you have 10 moles of H₂​ and 8 moles of O₂​, which is the limiting reactant?

• H₂

• O₂

• H₂O

• Both H₂ and O₂

How can you identify the excess reactant(s) in a reaction?

• It's the reactant that is completely consumed.

• It's the reactant that remains after the reaction is complete.

• It's always the reactant with the larger coefficient in the balanced equation.

• It's always the reactant with the smaller coefficient in the balanced equation.

In a reaction where aluminum reacts with oxygen to form aluminum oxide

4mol Al + 3mol O₂ → 2mol Al₂O₃,

54 grams of aluminum reacts with 48 grams of oxygen. Which statement is true?

Al = 27 g/mol

O = 16g/mol

• Aluminum is the limiting reactant.

• Oxygen is the limiting reactant.

• Both reactants are completely consumed.

• The reaction cannot occur as written.

What will happen to the reaction when the limiting reactant is depleting?

• The reaction will not continue.

• The reaction will stop.

• The reaction remains.

• Cannot be determined.