HMH Unit 3 Lesson 1 - Chemical Reactions

Front

What is a chemical property?

Back

A characteristic of a substance that can only be observed during a chemical reaction, indicating the ability of a substance to change into a different substance.

Front

What is a physical property?

Back

A characteristic of a substance that can be observed without changing the substance into a new one, such as color, shape, or state.

Front

Give an example of a chemical change.

Back

Burning wood, which transforms it into ash and smoke.

Front

Give an example of a physical change.

Back

Melting ice, which changes from solid to liquid but remains water.

Front

What happens during a chemical reaction?

Back

Substances undergo a transformation to form new substances with different properties.

Front

What is the best evidence of a chemical change?

Back

Indicators such as color change, gas production, or temperature change.

Front

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

Back

A physical change does not alter the substance's chemical composition, while a chemical change does.

Front

What is an example of a physical property?

Back

The boiling point of water, which is 100 degrees Celsius at sea level.

Front

What is an example of a chemical property?

Back

The ability of iron to rust when exposed to moisture.

Front

What is the significance of observing a substance's properties?

Back

It helps determine whether a chemical or physical change has occurred.