Limiting Reactants and Chemical Equations

This video tutorial covers the concepts of limiting and excess reactants using particle diagrams. It explains how to identify which reactant limits the amount of product formed and which reactant is left over. The tutorial includes practice problems involving reactions between carbon and sulfur, and nitrogen and hydrogen, demonstrating how to balance chemical equations and determine the limiting and excess reactants.

What is a limiting reactant in a chemical reaction?

• A reactant that does not participate in the reaction

• A reactant that is always in excess

• A reactant that limits the amount of product formed

• A reactant that is never used up

What does a particle diagram represent in a chemical reaction?

• The color change in the reaction

• The temperature of the reaction

• The visual representation of particles involved

• The speed of the reaction

In a reaction between carbon and sulfur, which reactant is in excess if carbon is left over?

• Both are in excess

• Sulfur

• Neither is in excess

• Carbon

How do you identify the limiting reactant in a chemical reaction?

• It is the reactant that changes color

• It is the reactant that is left over

• It is the reactant that is used up completely

• It is the reactant that is added last

What is the product formed when carbon reacts with sulfur?

• Sulfur trioxide

• Carbon monoxide

• Carbon disulfide

• Sulfur dioxide

Why is it important to balance chemical equations?

• To ensure the reaction is fast

• To maintain the simplest ratio of reactants to products

• To increase the amount of reactants

• To decrease the amount of products

What should you do after balancing a chemical equation?

• Check the ratio of reactants to products

• Decrease the pressure

• Increase the temperature

• Add more reactants

In the reaction between nitrogen and hydrogen, what is the product formed?

• Water

• Ammonia

• Nitrogen dioxide

• Hydrogen peroxide

What is the excess reactant in the nitrogen and hydrogen reaction if hydrogen is left over?

• Hydrogen

• Nitrogen

• Both are excess

• Neither is excess

What is the ratio of nitrogen to hydrogen in the formation of ammonia?

• 1:3

• 1:1

• 1:2

• 2:3