Physical and Chemical Changes Review

Front

What type of change can cause energy to change from one form to another, such as heat or light energy?

Back

Chemical change.

Front

What is a sign of a chemical change when a new odor is produced?

Back

The production of a new odor indicates a chemical change.

Front

What type of change may result in the formation of a precipitate when liquids combine?

Back

Chemical change.

Front

How can you increase the rate of a chemical reaction?

Back

By increasing the temperature.

Front

What type of change often causes fizzing or foaming?

Back

Chemical change.

Front

What is the definition of a physical change?

Back

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

Front

What is the definition of a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What are some common indicators of a chemical change?

Back

Color change, temperature change, gas production, formation of a precipitate, and odor change.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What role does temperature play in chemical reactions?

Back

Increasing temperature generally increases the rate of chemical reactions.