Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

Front

What are the reactants in the equation 2H₂ + O₂ → 2H₂O?

Back

2H₂ + O₂

Front

How many elements are in the chemical formula NaHCO₃?

Back

4

Front

What is a subscript in a chemical formula?

Back

A small number below an element symbol that tells the number of atoms of that element.

Front

What are the starting substances in a chemical equation called?

Back

Reactants

Front

What is a product in a chemical reaction?

Back

The substances formed as a result of a chemical reaction.

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

Front

What does a coefficient in a chemical equation indicate?

Back

The number of molecules or moles of a substance involved in the reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance, while a chemical change alters its chemical composition.

Front

What is an example of a chemical reaction?

Back

Burning wood, which produces ash, smoke, and gases.