Grade 5 Changes in Matter

Front

What is thermal energy?

Back

The total energy of all the particles in an object.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances, such as when an egg spoils.

Front

What happens to the mass of paper when it is burned?

Back

The mass of the ash is less than the original paper because some products of the reaction are given off as gas.

Front

What element causes oxidation?

Back

Oxygen.

Front

What does the Law of Conservation of Mass state?

Back

Mass is neither created nor destroyed in a chemical or physical change.

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

Rusting of iron.

Front

What is an example of a physical change?

Back

Melting of ice.

Front

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

Back

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

Front

What is the significance of the Law of Conservation of Mass in chemical reactions?

Back

It ensures that the total mass of reactants equals the total mass of products.