1. Find equivalents:

2. Complete the sentences:

1. A solid is

2. Strong forces holding the atoms together allow only

3. Carbon exists in forms called

4. A group of elements sharing certain properties is    

5. Metals can

6. Differences between metals determine

7. Metals are rarely used in

8. Non-metals are unable

9. Semimetals or metalloids have the characteristics of

10. A type of solid matter that always forms the same shape is

11. Crystals are formed when

12. Crystalline substances find their application in

3. Answer the questions:

1. What does the hardness of a solid depend on?

2. Why can a solid have soft and hard forms?

3. Why is metal available for being used in industry?

4. How many metals and non-metals are known today?

5. What is an alloy?

6. Why do some non-metals contain chlorine and hydrogen?

7. How many sided can crystals be?

8. Can crystals be produced artificially?

9. What crystalline substances are used in jewelry?

10. What crystal is applied in watches?

4. Find synonyms:

solid, free, investigate, respectively, degree, certain, however, draw together, rarely, harden, later, break up, solidify, extent, attract, correspondingly, consider, hard, split, seldom, observe, regard, release, yet, eventually, definite.

5. Find antonyms:

excess, artificially, solid, shortage, release, soft, naturally, hold.

6. Do Quizes 3, 4.