Question

Exercise II. Read about the properties of materials and complete the sentences
with the examples. Познакомьтесь со свойствами материалов и дополните
фразы примерами.

A brittle material breaks easily: eg. glass, ... .
A tough material does not break easily: eg. steel … .

A hard material is difficult to scratch: eg. glass, … .
A soft material is easy to scratch: eg. chalk, ... .

2

A flexible material bends easily: eg. rubber, … .
A rigid material does not bend easily: eg. concrete, … .

Some materials have a smooth surface; they produce little friction
when they are rubbed: eg. ice, … .

Some materials have a rough surface and produce a lot of friction: eg.
sandpaper, … .

Materials which are soluble in water dissolve easily: eg. salt, …

Materials which are insoluble do not dissolve: eg. glass, … .

Combustible materials burn easily: eg. wood, … .

Non-combustible materials do not burn: eg. stone, … .

Answer 1

1. ceramic, graphite

2. diamond, graphere, spider silk, carbon

3. granite, diamond, quartz, tempered steel, iron

4. sponge, cotton

5. leather, plastic, paper

6. aluminum, plywood panels, steel panels

7. glass, marble, satin, metal

8. asphalt, granite, coconut, coral

9. sugar, coffe, pepper

10. sand, fat, wood, plastic

11. paper, rubber, plastic

12. steel, ceramics, fiberglass