Chemical and 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.

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 ice cube melting is an example of a physical change.

Front

Give an example of a chemical change.

Back

Copper tarnishing 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.

Front

Is dissolving sodium hydroxide in water a chemical or physical change?

Back

It is a physical change.

Front

Is sugar dissolving in water a chemical or physical change?

Back

It is a physical change.

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

What is an example of a reversible physical change?

Back

Melting and freezing of water are examples of reversible physical changes.