Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change in form, appearance, or state of matter without altering the chemical composition of the substance.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of one or more new substances with different properties.

Front

What is evidence of a chemical change?

Back

Evidence of a chemical change includes unexpected temperature change, production of gas, formation of a precipitate, and production of light.

Front

What happens when a cracker is broken into pieces?

Back

It is a physical change because the composition of the cracker remains the same.

Front

What is a precipitate?

Back

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

Front

What does an unexpected color change indicate?

Back

An unexpected color change is evidence of a chemical change.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not create new substances, while chemical changes do.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.

Front

What does it mean if gas is produced during a reaction?

Back

The production of gas is a sign that a chemical reaction has occurred.