Counting/Balancing Chemical Equations Test Review

Front

What is a coefficient?

Back

The large number to the left of a formula.

Front

Choose the coefficients that will correctly balance this equation: CH₄ + O₂ → CO₂ + H₂O

Back

1,2,1,2

Front

In a ______________________________ energy is absorbed by the system as heat.

Back

Endothermic Reaction

Front

What is the left part of a chemical equation called? 2H₂ + O₂ → 2H₂O

Back

Reactants

Front

What coefficient belongs with hydrochloric acid (HCl) in the equation: Mg + ___ HCl → MgCl₂ + H₂?

Back

2

Front

What is an exothermic reaction?

Back

A reaction that releases energy in the form of heat.

Front

What are products in a chemical equation?

Back

Substances formed as a result of a chemical reaction.

Front

What does it mean to balance a chemical equation?

Back

To ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is the role of a catalyst in a chemical reaction?

Back

To speed up the reaction without being consumed.