Balancing Chemical Equations and Types of Reactions Review

Front

What must be true about the number of atoms in a chemical reaction?

Back

The number of atoms you begin with must be the same as the number of atoms you end with.

Front

What type of change occurs when a nail rusts?

Back

Chemical change.

Front

What type of change occurs when chocolate melts?

Back

Physical change.

Front

Balance the equation: ____ Al + ____ HCl → ____ AlCl₃ + ____ H₂

Back

2, 6, 2, 3.

Front

Balance the equation: __NaClO₃ --> __NaCl + __O₂

Back

2, 2, 3.

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A substance that is formed as a result of a chemical reaction.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.