Limiting reactants

What is stoichiometry?

• The study of chemical bonds.

• The calculation of reactants and products in chemical reactions.

• The measurement of temperature in reactions.

• The analysis of reaction rates.

If you have 5 moles of A and 3 moles of B, and A reacts with B in a 1:1 ratio, which is the limiting reactant?

• A, because there are more moles.

• B, because there are fewer moles.

• Both A and B react completely.

• Neither A nor B is a limiting reactant.

What happens to the excess reactant in a chemical reaction?

• It is completely consumed during the reaction.

• It remains unreacted after the reaction is complete.

• It transforms into a different substance.

• It increases the rate of the reaction.

What is the molar mass of CO2?

• 32 g/mol

• 44 g/mol

• 28 g/mol

• 12 g/mol

What is the effect of a limiting reactant on the yield of a product?

• It increases the yield of the product.

• It has no effect on the yield of the product.

• It limits the maximum amount of product that can be formed.

• It allows for the complete conversion of reactants to products.

What is the mole ratio in the reaction of aluminum and chlorine to form aluminum chloride?

• 1 mole of Al reacts with 2 moles of Cl2.

• 2 moles of Al react with 3 moles of Cl2.

• 3 moles of Al react with 2 moles of Cl2.

• 2 moles of Al react with 2 moles of Cl2.

In a reaction, if you have 4 moles of reactant X and 6 moles of reactant Y, and they react in a 2:3 ratio, which is the limiting reactant?

• X, because it will be consumed first.

• Y, because it is in excess.

• Both X and Y will be consumed at the same time.

• Neither X nor Y is a limiting reactant.

What is the definition of excess reactant?

• The reactant that is not completely consumed in a reaction.

• The reactant that is completely consumed in a reaction.

• The reactant that is present in a greater amount than needed for the reaction.

• The reactant that does not participate in the reaction.

In a sandwich recipe, if you have 10 pieces of bread, 4 tablespoons of peanut butter, and 20 tablespoons of jelly, what is the limiting reactant?

• Peanut butter

• Bread

• Jelly

• Mayonnaise

If 2 moles of aluminum and 2 moles of chlorine are reacted, which is the limiting reactant?

• Al

• Cl2

• AlCl3

• None of the above