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, altering the chemical composition of the original substance.

Front

Give an example of a physical change.

Back

An example of a physical change is ice melting into water.

Front

Give an example of a chemical change.

Back

An example of a chemical change is rust forming on iron.

Front

What are some signs of a chemical change?

Back

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

Front

Is melting chocolate a physical or chemical change?

Back

Melting chocolate is a physical change.

Front

Is baking cookies a physical or chemical change?

Back

Baking cookies is a chemical change.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules rearrange but do not change their chemical structure.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the molecules break apart and form new molecules with different chemical structures.

Front

What is an example of a sign of a chemical change in a fire?

Back

An example of a sign of a chemical change in a fire is the production of light.