Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into different substances with distinct properties, often involving a chemical reaction.

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.

Front

Give an example of a chemical change.

Back

Burning gasoline in a car engine is an example of a chemical change.

Front

Give an example of a physical change.

Back

Melting ice into water is an example of a physical change.

Front

What is rusting?

Back

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

Front

What are some signs that a chemical change has occurred?

Back

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

Front

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

Back

A chemical change results in the formation of new substances, while a physical change does not change the chemical identity of the substance.

Front

What is an example of a sign that a chemical change has NOT occurred?

Back

A loss of transparency is NOT a sign that a chemical change has occurred.

Front

What happens to the properties of substances during a chemical change?

Back

The properties of substances change during a chemical change, resulting in new substances with different properties.

Front

What is an example of a physical change that can be reversed?

Back

Freezing water into ice is a reversible physical change.