Physical and Chemical 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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving a rearrangement of atoms.

Front

Give an example of a physical change.

Back

Smashing cookies is an example of a physical change.

Front

Give an example of a chemical change.

Back

Food digestion is an example of a chemical change.

Front

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

Back

The chemical composition of a substance changes during a chemical change, resulting in new substances.

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

Front

Is frying an egg a physical or chemical change?

Back

Frying an egg is a chemical change because it alters the chemical structure of the proteins in the egg.

Front

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

Back

A physical change does not change the chemical composition of a substance, while a chemical change does.

Front

What occurs during the mixing of Mentos and Coke?

Back

The mixing of Mentos and Coke is a chemical change that produces gas rapidly, resulting in an explosive reaction.

Front

Can a physical change be reversed?

Back

Many physical changes can be reversed, such as melting and freezing, but chemical changes are usually irreversible.