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

Freezing water into ice is an example of a physical change.

Front

Give an example of a chemical change.

Back

Rusting of iron is an example of a chemical change.

Front

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

Back

The identity of the substance remains the same during a physical change.

Front

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

Back

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

Front

What is a precipitate?

Back

A precipitate is a solid that forms from a solution during a chemical reaction and cannot change back to its original state.

Front

Is dissolving sugar in water a physical or chemical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

What is an indicator of a chemical change?

Back

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

Front

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change because it changes from liquid to gas without altering its chemical composition.