NI

2. • Useful materials are things
that can be used anytime and
do not harm human beings.

4. Harmful - capable of causing
harm or injury.
Materials – substances that are
used to manufacture products.
Products – things that we used in
our everyday life.
Toxic – are dangerous to people
and animals even in small
amounts.

5. A material is HARMFUL if there is
more than harm than good that
can be obtained from it.
Like for example batteries.

6. Identify the property of each material used at
home. Choose the best answer inside the
parentheses.
1. Rubber – (Elastic, soft, brittle)
2. Stone – (hard, soft, brittle)
3. Rain coat – (hard, waterproof, smooth)
4. Sponge- (soft, waterproof, brittle)
5. Casserole – (conductor of heat, heat insulator,
non-conductor of heat)

7. 1. Look for five useful solid or liquid materials found at home,
2. Complete the table below. On the first column name the material,
second column write the property and on the third column its uses.