Changes in Matter: Physical or Chemical

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 changes in state (like melting or freezing) and changes in shape or size.

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 rusting iron and burning wood.

Front

Is filling a balloon with air a physical or chemical change?

Back

Physical change.

Front

What happens to water when it boils?

Back

When water boils, it undergoes a physical change from liquid to gas (steam) without changing its chemical composition.

Front

What is the result of water freezing into ice?

Back

Water freezing into ice is a physical change where the state of water changes from liquid to solid.

Front

What type of change is breaking a plate?

Back

Breaking a plate is a physical change because it alters the shape of the plate but does not change its chemical composition.

Front

What occurs when baking soda and vinegar are mixed?

Back

Mixing baking soda and vinegar results in a chemical change, producing carbon dioxide gas and new substances.

Front

Can physical changes be reversed?

Back

Many physical changes can be reversed, such as freezing and melting, but some may not be reversible, like breaking a glass.

Front

Can chemical changes be reversed?

Back

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

Front

What is an example of a physical change in nature?

Back

An example of a physical change in nature is the melting of ice in the sun.