VI. Listening

a. Listen to the tape and complete the sentences.

1. Chemistry is the study of matter, its………………..…, properties and the changes that matter undergoes.

2. … ………chemistry usually comes after …………… chemistry.

3. Mass is the ……………. of matter in an object.

4. …………….. are made up of a particular type of matter.

5. There are only two ………….. of chemistry: organic and inorganic.

6. Organic chemistry studies ……………….. containing carbon.

7. ………………..chemistry studies the behavior of substances.

b. Listen to the tape and mark the sentences as true or false.

1. Pure chemistry gathers the knowledge and it is the same as the basic research. T/F

2. Applied chemistry is the use of chemistry in specific fields such as medicine or agriculture. T/F

3. Matter doesn`t take up space and doesn`t have a mass. T/F

4. There are four essential types of matter. T/F

5. Physical properties can be observed and measured without changing a substance. T/F

6. Physical chemistry studies the composition of substances. T/F

7. Biochemistry is the study of living things. T/F

VIII. Writing

Choose one of the topics and write a composition (80-100 words).

a) The future of chemistry: will it have the future development?

b) Chemistry and its role in modern society.

VII. Extra activities

a. Match the columns to get correct definitions. Pay attention to different meanings of the verbs in the middle column of the table.

The field		The subject
1. Organic chemistry	deals with	a) radioactive elements.
2. Inorganic chemistry	covers	b) chemical properties and reactions involving ions in solutions.
	considers
3.Analytical chemistry		c) compounds of carbon.
4. Physical chemistry	treats of	d) methods of separating pure substances from mixtures.
5. Biochemistry		e) elements other than carbon.
6. Radiochemistry	concerns itself with	f) effects of chemical structure on physical properties of matter.
7. Electrochemistry		g) substances contained in living organisms.
	is concerned with
8. Magneto chemistry		h) spatial arrangement of atoms in molecules.
9. Stereochemistry		i) complex substances produced by living cells.
10. Enzymology		j) the magnetic properties of compounds.

IX. Grammar: Present Tenses

a. Complete the sentences below by putting the verb in brackets into the most suitable form of the present simple or the present continuous.

1. What …(you/do) this summer? – We … (visit) friends in Greece.

2. Oil and water … (not/mix). Oil …(float) on top of the water.

3. I …(not/understand) what he says. …(he/speak) English or German?

4. We normally …(go) to a keep-fit class on Wednesday evenings but tomorrow we can`t because we …(work) late.

5. I …(know) what you …(mean) but I …(not/agree) with you.

6. Don`t disturb him! He …(think).

7. I …(see) how to do it now. Thanks for showing me.

8. The kettle … (boil). Please switch it off.

b. Complete the sentences below by putting the verb in brackets into the most suitable form of the present perfect or the present perfect continuous.

1. You look frozen! How long …(you/stand) out here in the cold?

2. I saw this film a few weeks ago but I …(never/read) the book.

3. What …(you/do) lately? This is the first time I … (see) you since we met at the Smiths` party last May.

4. He … (not/have) a cold since last November.

5. How long … (you/wait) for him?

6. They … (live) in London all their lives.

7. We … (travel) all this year, so far we … (visit) five countries this year.

8. It … (rain) since last Friday.

c. Open the brackets and put the verbs into the proper tense (Present Simple, Present Continuous, Present Perfect or Present Perfect Continuous).

1. It … (snow) steadily the whole week and it still … (snow).

2. We …(climb) for 6 hours already, but we …(not/reach) the top of the mountain.

3. The pain … (already/go) but the baby … (still/cry).

4. He … (work) at the language all the time and … (make) a great progress. His pronunciation … (be) rather good, only a slight accent …(remain).

5. Why is your hair wet? … (you/swim)?

6. Doctors and scientists … (recently/prove) the benefit of fish in the diet.

7. Dustin Hoffman, who … (play) the hero, …(give) a fine performance.

8. He … (solve) a crossword puzzle for an hour and he … (say) he is about to solve it as he …(think) over the last word.

UNIT 2

Symbols, reactions and equations