Balancing Chemical Equations

The video tutorial explains how to balance a chemical equation involving calcium metal and water, resulting in calcium hydroxide and hydrogen gas. It begins by counting the atoms on both sides of the equation, identifying an imbalance in hydrogen atoms. The tutorial then demonstrates how to balance the equation by adjusting the coefficients, ensuring equal numbers of each type of atom on both sides. The process is completed with a final check to confirm the equation is balanced.

What are the initial reactants in the chemical equation discussed?

• Water and hydrogen gas

• Calcium metal and oxygen

• Calcium metal and water

• Calcium hydroxide and hydrogen gas

How many hydrogen atoms are initially present on the reactant side?

• Three

• Two

• One

• Four

What does the number '2' outside the parentheses in the product side indicate?

• It applies only to oxygen

• It applies to everything inside the parentheses

• It applies only to hydrogen

• It applies only to calcium

Why is the equation initially unbalanced?

• There are more oxygen atoms on the product side

• There are more calcium atoms on the reactant side

• There are more hydrogen atoms on the product side

• There are more hydrogen atoms on the reactant side

What adjustment is made to balance the hydrogen atoms?

• Add a coefficient of 3 in front of calcium hydroxide

• Add a coefficient of 2 in front of water

• Add a coefficient of 2 in front of calcium

• Add a coefficient of 3 in front of water

What is the final balanced chemical equation?

• Ca + 2H2O → Ca(OH)2 + 2H2

• Ca + H2O → Ca(OH)2 + 2H2

• Ca + 2H2O → Ca(OH)2 + H2

• Ca + H2O → CaOH2 + H2