Chemical and Physical Properties & Changes

Front

What is a chemical change?

Back

A process where new substances are formed, involving a rearrangement of atoms and bonds.

Front

What is a physical change?

Back

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

Front

Give an example of a chemical change.

Back

Burning wood, where new substances like ash and smoke are formed.

Front

Give an example of a physical change.

Back

Melting ice into water, where the substance remains H2O.

Front

What are indicators of a chemical change?

Back

Color change, gas production, temperature change, and formation of a precipitate.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it remains constant.

Front

What happens to the molecules during a chemical change?

Back

Molecules break apart and rearrange to form new molecules.

Front

What happens to the molecules during a physical change?

Back

Molecules may change their arrangement or state but remain the same substance.

Front

What is an example of a physical change in the kitchen?

Back

Chopping vegetables, where the substance remains the same.

Front

What is an example of a chemical change in the kitchen?

Back

Baking a cake, where new substances are formed through chemical reactions.