Physical and Chemical Changes

Front

What is a sign that a chemical reaction has occurred?

Back

Formation of a gas, change in color, temperature change, or formation of a precipitate.

Front

Is melting butter for popcorn a chemical or physical change?

Back

Physical change.

Front

True or False: Change in color is a physical change.

Back

False; change in color can indicate a chemical change.

Front

What is a chemical change?

Back

A change where one or more new substances are created.

Front

Which of the following is NOT an example of a physical change: rust, melting ice, boiling water, or dissolving sugar?

Back

Rust is not a physical change; it is a chemical change.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance.

Front

List some examples of physical changes.

Back

Melting, freezing, boiling, dissolving, and breaking.

Front

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

Back

A physical change does not create new substances, while a chemical change does.

Front

What is an indicator of a chemical change?

Back

Indicators include gas formation, color change, temperature change, and precipitate formation.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed.