Chemical vs. Physical Changes

Front

What is a physical change?

Back

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

Front

What is a chemical change?

Back

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

Front

Is mixing air into egg whites a physical or chemical change?

Back

Physical change.

Front

What happens to the properties of a substance during a physical change?

Back

The properties may change, but the substance remains the same.

Front

What happens to the properties of a substance during a chemical change?

Back

The properties change, and new substances are formed.

Front

What is an example of a physical change?

Back

Melting ice, mixing sand and salt.

Front

What is an example of a chemical change?

Back

Burning wood, rusting iron.

Front

How can you tell if a chemical change has occurred?

Back

Signs include color change, gas production, temperature change, or formation of a precipitate.

Front

What is the flame test used for?

Back

The flame test is used to identify the presence of certain gases, like hydrogen.

Front

What sound does hydrogen make in a flame test?

Back

A pop.