Chapter 4 (Materials)

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

Is the statement true or false?

Glass is the only manufactured material.

Is the statement true or false?

All materials have only one property.

Is the statement true or false?

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

Is the statement true or false?

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

Is the statement true or false?

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

Is the statement true or false?

Complete the sentence.

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

This experiment shows us how _____ the plastic ruler is.

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

----- are used to make objects.

(a)