Chemical and Physical Changes in Matter

Front

What is a Chemical Change?

Back

A process where one or more substances are transformed into new substances with different properties, often accompanied by energy changes.

Front

What is a Physical Change?

Back

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 wood, where new substances (ash, smoke) are formed.

Front

Give an example of a Physical Change.

Back

Melting ice into water, where the substance remains H2O.

Front

What is the difference between a Chemical Change and a Physical Change?

Back

Chemical changes result in new substances, while physical changes do not change the chemical identity of the substance.

Front

What is a property that indicates a Chemical Change?

Back

The ability to burn (flammability) is a chemical property.

Front

What happens during a Physical Change?

Back

The form of a substance changes, but its chemical identity remains the same.

Front

What is an example of a Physical Change that can be reversed?

Back

Freezing and melting water.

Front

What is an example of a Chemical Change that cannot be reversed?

Back

Cooking an egg, where new substances are formed.

Front

What is an Endothermic Reaction?

Back

A reaction that absorbs energy from its surroundings, often resulting in a temperature drop.