Limiting Reactants and Stoichiometry

The video tutorial explains stoichiometry problems involving limiting reactants. It covers examples such as the reactions of methanol with oxygen, CO with oxygen, zinc with hydrochloric acid, and aluminum with bromine. Each example illustrates how to identify the limiting reactant and calculate the yield of products. The tutorial emphasizes understanding the concept of limiting reactants in chemical reactions and provides a quantitative analysis of these reactions.

What is the main reason for using a small amount of platinum chloride in the reaction to make CIS platin?

• It is highly reactive.

• It is very expensive.

• It is not readily available.

• It reacts slowly.

In the methanol and oxygen reaction, why is methanol considered the limiting reactant?

• Methanol is less stable than oxygen.

• Methanol is present in a smaller quantity than oxygen.

• Oxygen is not involved in the reaction.

• Methanol is more reactive than oxygen.

In the CO and oxygen reaction, what determines the amount of CO2 produced?

• The pressure of the system.

• The amount of oxygen available.

• The temperature of the reaction.

• The amount of CO available.

In the zinc and hydrochloric acid experiment, what indicates that hydrochloric acid is the limiting reactant in the left-hand flask?

• The balloon is larger than in other flasks.

• The reaction produces no gas.

• There is zinc remaining at the end of the reaction.

• The balloon does not inflate.

What happens to the zinc in the right-hand flask during the zinc and hydrochloric acid experiment?

• It is completely consumed.

• It reacts with the balloon.

• It is partially consumed.

• It remains unreacted.

In the zinc and hydrochloric acid experiment, what does the size of the balloon indicate?

• The amount of zinc used.

• The amount of hydrogen gas produced.

• The temperature of the reaction.

• The purity of the reactants.

In the aluminum and bromine reaction, how many moles of bromine are required for 3 moles of aluminum?

• 2 moles

• 3 moles

• 4.5 moles

• 6 moles

When 3 moles of aluminum react with 6 moles of bromine, which is the limiting reactant?

• Aluminum

• Bromine

• Both are limiting

• Neither is limiting

What is the stoichiometric factor used to determine the limiting reactant in the aluminum and bromine reaction?

• 2:3

• 3:2

• 1:2

• 1:1

Why is it important to identify the limiting reactant in a chemical reaction?

• To reduce the cost of reactants.

• To determine the maximum amount of product formed.

• To ensure complete reaction of all reactants.

• To increase the reaction speed.