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 burning, rusting, and cooking.

Front

What happens to ice when it melts?

Back

When ice melts, it undergoes a physical change from solid to liquid, but its chemical composition (H2O) remains the same.

Front

What is an example of a substance being formed?

Back

An example of a substance being formed is wood burning, which produces ash, smoke, and gases.

Front

What describes the change in a wax candle left in a warm car?

Back

The candle changed its shape due to melting, which is a physical change.

Front

What is the effect of heat on water in terms of physical changes?

Back

Heat being added or taken away causes physical changes in water, such as melting ice into water or boiling water into steam.

Front

Can the original substances be recovered in a physical change?

Back

Yes, in a physical change, the original substances can often be recovered, such as in the freezing of juice.

Front

What is an example of a physical change involving water?

Back

An example of a physical change involving water is ice melting into liquid water.

Front

What is rusting?

Back

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide.

Front

What happens during the baking of cookies?

Back

Baking cookies is a chemical change because it transforms the ingredients into a new substance with different properties.