Lesson 3: Materials

A material is a pure type of solids, liquids and gases.

• True

• False

Answer explanation

It is a substance.

All matter is made up of ---.

• materials

• substances

• mixtures

• particles

We have learned that some solids are similar to liquids because they can pour and take up the shape of the container. You may choose more than one correct answer.

• sand

• sugar

• rock

• ice

Arthur and Marcus want to compare how much times to melt margarine and butter.

• Put equal amount of butter and margarine together in a pan.

• Put equal amounts of butter and margarine in a pan and a pot.

• Heat both pans one after the other on the same stove.

• Heat each pan on an identical stove starting at the same time.

The change of state from ----- to ------ is melting.

The change of state from liquid to solid is ------.

Change of a state is a physical process.

• True

• False

Answer explanation

A physical process means the substance can only change its form, such as from solid to liquid and from liquid to solid. Howevr, it does not change into a different substance.

Metals can melt when we heat them at ---.

• the very high temperature.

• the very low temperature.

• the medium temperature.

Ice can change into liquid water because of ----.

• heating

• cooling

Solids have a fixed shape because their particles -----.

• do not move very much.

• can move around each other.

• can move quickly in all directions.