Physical and Chemical Changes

Front

What is a chemical change?

Back

A process where one or more new substances are formed, often accompanied by changes in color, temperature, or the production of gas.

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, which produces ash and smoke.

Front

Give an example of a physical change.

Back

Melting ice into water.

Front

What happens during a phase change?

Back

A substance changes from one state of matter to another, such as solid to liquid.

Front

Are physical changes reversible?

Back

Yes, physical changes are often reversible, such as freezing and melting.

Front

Are chemical changes reversible?

Back

Chemical changes are usually not reversible without additional chemical reactions.

Front

What are some indicators of a chemical change?

Back

Change in color, production of light, production of heat, and formation of gas.

Front

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

Back

A physical change does not alter the substance's chemical structure, while a chemical change does.

Front

What is an example of a reversible physical change?

Back

Dissolving sugar in water, which can be reversed by evaporation.