Chapter 4 (Materials)

Materials that occur naturally may come from plants and the ground.

Is the statement true or false?

• True

• False

Glass is the only manufactured material.

Is the statement true or false?

• True

• False

All materials have only one property.

Is the statement true or false?

• True

• False

We can test how hard a material is by scratching it.

Is the statement true or false?

• True

• False

Plastic is used to make a raincoat because it is waterproof and flexible.

Is the statement true or false?

• True

• False

When we burn paper, we change its property. We get a new material.

Is the statement true or false?

• True

• False

Complete the sentence.

When paper burns, it changes into a different (a)  

This experiment shows us how _____ the plastic ruler is.

• waterproof

• flexible

• rigid

• see-through

By doing this experiment, we can find out that the ______ is a see-through material.

• glass box

• cardboard box

----- are used to make objects.

(a)