Physical and Chemical Changes Review

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 melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting, burning, and baking.

Front

Give an example of a physical change.

Back

Making a paper airplane is an example of a physical change.

Front

What happens to a substance during a chemical change?

Back

During a chemical change, the substance undergoes a transformation that changes its chemical structure, resulting in new substances.

Front

What is rust?

Back

Rust is a chemical compound that forms when iron reacts with oxygen and moisture, resulting in a reddish-brown substance.

Front

How can you tell if a chemical change has occurred?

Back

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

Front

What happens to crayons when left in a hot car?

Back

The crayons melt, changing from a solid to a liquid.

Front

What is an example of a chemical change in cooking?

Back

Baking cake batter to make a cake is an example of a chemical change.

Front

What does it mean when a flag's colors are dull and faded?

Back

It means that the flag has undergone a physical change due to exposure to sunlight, which can affect its appearance.

Front

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

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in new substances being formed.