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. Examples include tearing paper, melting ice, and dissolving sugar in water.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include burning wood, rusting iron, and baking a cake.

Front

Is ripping up paper a chemical or physical change?

Back

Ripping up paper is a physical change.

Front

What happens when sugar dissolves in water?

Back

When sugar dissolves in water, a physical change occurs.

Front

Is cracking an egg a chemical or physical change?

Back

Cracking an egg is a physical change.

Front

What is an example of a chemical change?

Back

Burning sugar is an example of a chemical change.

Front

What occurs when baking soda and vinegar are mixed?

Back

When baking soda and vinegar are combined, a chemical change occurs, producing carbon dioxide gas.

Front

Can physical changes be reversed?

Back

Many physical changes can be reversed, such as freezing and melting water.

Front

Can chemical changes be reversed?

Back

Chemical changes are usually not reversible by simple physical means, as they involve the formation of new substances.

Front

What is an example of a reversible physical change?

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An example of a reversible physical change is freezing and melting water.