Solving Limiting Reactant Practice Problems!

The video tutorial explains how to identify and solve limiting reactant problems using BCA tables. It covers three examples: NaCl and F2, phosphorus and oxygen, and silicon dioxide with sodium hydroxide. The tutorial emphasizes converting grams to moles, using balanced chemical equations, and determining which reactant is limiting. It also demonstrates how to calculate the amount of excess reactant and the mass of products formed.

What is the primary indicator that a problem involves a limiting reactant?

• The problem involves a single reactant.

• The problem provides the mass of both reactants.

• The problem asks for the amount of product formed.

• The problem provides the mass of only one reactant.

What is the first step in solving a limiting reactant problem?

• Determine the reaction rate.

• Calculate the molar mass of the products.

• Convert the mass of reactants to moles.

• Identify the products formed.

Why is it important to use a BCA table in stoichiometry problems?

• It helps in balancing chemical equations.

• It provides a visual representation of the reaction progress.

• It ensures the reaction is spontaneous.

• It simplifies the calculation of reaction rates.

In the sodium chloride and fluorine example, why is NaCl identified as the limiting reactant?

• NaCl is not involved in the reaction.

• NaCl is present in excess.

• NaCl is used up faster than F2.

• NaCl has a higher molar mass.

How do you determine the amount of excess reactant left over in a reaction?

• By adding the moles of products formed.

• By subtracting the moles of limiting reactant used from the initial moles of excess reactant.

• By dividing the initial mass of the reactant by its molar mass.

• By calculating the initial moles of the limiting reactant.

In the phosphorus and oxygen example, what is the limiting reactant?

• Both are limiting

• Neither is limiting

• Oxygen

• Phosphorus

What is the significance of a positive number when checking the limiting reactant?

• It confirms the correct limiting reactant was chosen.

• It shows the excess reactant is used up.

• It indicates the reaction is complete.

• It means the reaction did not occur.

In the silicon dioxide and sodium hydroxide example, what is the limiting reactant?

• Sodium hydroxide

• Silicon dioxide

• Both are limiting

• Neither is limiting

How do you calculate the grams of a product formed in a reaction?

• By multiplying the moles of product by the molar mass of the reactant.

• By multiplying the moles of product by the molar mass of the product.

• By dividing the moles of product by the molar mass of the product.

• By adding the moles of reactants used.

What does a negative number indicate when checking for the limiting reactant?

• The reaction has not started.

• The chosen reactant is not limiting.

• The chosen reactant is in excess.

• The reaction is complete.