7th Grade Benchmark Review

Front

What must be true for an equation to be balanced?

Back

There must be an equal amount of atoms on both sides.

Front

What observation indicates a chemical reaction occurred during an experiment?

Back

The temperature of the vinegar increased during the reaction.

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be gained or lost in a chemical reaction.

Front

What type of change occurs when water freezes into ice?

Back

Physical change.

Front

How can you increase the rate of a chemical reaction?

Back

By increasing the temperature.

Front

What is a chemical reaction?

Back

A process where substances (reactants) transform into different substances (products).

Front

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

Back

A physical change alters the form of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is an example of a physical change?

Back

Melting ice.

Front

What is an example of a chemical change?

Back

Rusting of iron.

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.