Unit 4- Changing Matter

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.

Front

What happens to the mass of substances in a closed system during a chemical reaction?

Back

The mass remains the same because of the Law of Conservation of Mass.

Front

How does temperature affect the rate of chemical reactions?

Back

Higher temperatures generally increase the rate of chemical reactions.

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

What is a chemical change?

Back

A chemical change occurs when a substance transforms into a different substance with different properties.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change.

Front

Give an example of a chemical change.

Back

Rusting of iron is an example of a chemical change.

Front

What role does temperature play in rusting?

Back

Higher temperatures speed up the rusting process.

Front

What happens to particles when temperature increases?

Back

Particles move faster when temperature increases.

Front

How can you differentiate between a physical change and a chemical change?

Back

You can differentiate by observing if a new substance is formed with different properties.