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 altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves making or breaking bonds between atoms. Examples include burning, rusting, and cooking.

Front

Is mixing lemonade powder with water a physical or chemical change?

Back

Physical change.

Front

Is bleaching your hair a physical or chemical change?

Back

Chemical change.

Front

Is burning toast a chemical or physical change?

Back

Chemical change.

Front

Is frying an egg a physical or chemical change?

Back

Chemical change.

Front

Is squeezing oranges to make orange juice a physical or chemical change?

Back

Physical change.

Front

What happens to the substance in a physical change?

Back

The substance may change its form or appearance, but its chemical identity remains the same.

Front

What happens to the substance in a chemical change?

Back

The substance undergoes a transformation that changes its chemical identity, resulting in new substances.

Front

Can physical changes be reversed?

Back

Yes, many physical changes can be reversed, such as freezing and melting.