Предмет: Химия, автор: Аноним

1)Выпишите формулу алкена,назовите это вещество:
А)С2Н4;Б)С5Н12;В)С4Н10;Г)С2Н5CL

Ответы

Автор ответа: Zarubit
0
Cn H2n формула алкена
Автор ответа: natalja333
0
відповідь а) С2Н4 - етен
Автор ответа: Аноним
0
это точно?
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Exercise 6.1.3. Put the verbs in brackets into Present Simple.
1. My sister (to get) up at eight o'clock. 2. She (to be) a school-girl. She
(to go) to school in the afternoon. 3. Jane (to be) fond of sports. She (to do) her
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two hours to do his hometask. 7. She (to speak) French well. 8. My working
day (to begin) at seven o'clock. I (to get) up, (to switch) on the radio and (to do)
my morning exercises. It (to take) me fifteen minutes. At half past seven we (to
have) breakfast. 9. My father and I (to leave) home at eight o'clock. He (to take)
a bus to his factory. 10. My mother (to be) a doctor, she (to leave) home at nine
o'clock.
Exercise 6.1.4. Put the verbs in brackets into Past Simple.
1. There isn’t a cloud in the sky, but it (be) cloudy in the morning. 2. Mrs.
Clay usually finishes her work at half past three, but she (finish) it later yesterday afternoon. 3. Tom is playing tennis tomorrow afternoon, he (not / play) tennis yesterday. 4. We generally have lunch at 12.30, but yesterday we (have
lunch) later. 5. Now my brother smokes a lot, but he (not /smoke) before.
6. My Dad always goes to work by car, but last week he (go) to work on foot.
7. The weather is nice today, but it (be) yesterday. 8. We rarely watch television, but last week we (watch) a lot of interesting programs. 9. I usually come
home from the Institute at 2.00 p.m., but last week I was on duty and (come)
home a little later. 10. It seemed impossible for him to win, but he (win).
11. It (take) him two hours to get to London. 12. As soon as the bus (stop), Jill
(get off). 13. Jack (try) to remember what he had done last April. 14. Julius Caesar (found) the Tower of London. 15. When you (write) to your parents last time?
Exercise 6.1.5. Choose a verb to fill in the blanks with Present Simple
or Past Simple.
finish, go, have, be
James usually ___ work at 4.30 p.m. Yesterday he ___ work at 1.00 p.m.
He usually ___ home by train. Yesterday he ___ home by taxi. He usually ___
dinner at home. Yesterday he ___ dinner in a restaurant with his friends. ___
to bed early. Yesterday he ___ to bed late because it __ his birthday.
Exercise 6.1.6. Complete these sentences using the verbs in brackets
in the Future Simple.
1. I’m tired. I ___ (go) to bed. 2. ___ I (answer) the question? 3. We don’t
know their address. What (we / do)? 4. Our test (not / take) long. 5. I’m afraid
they (not / wait) for us. 6. Diana (come) to the party tomorrow. 7. You (arrive)
in Paris tomorrow evening. 8. Perhaps they (buy) a new house this year. 9. He
(be) fourteen next year. 10. I’m not sure I (find) Jim at the hotel. 11. We
(not / book) the tickets in advance. 12. Do you think it (rain)? 13. Everybody
thinks they (not / get) married. 14. Dad (present) Mag a personal computer, ___ he?
15. ___ there (be) drugs for every kind of disease in 50 years’ time?
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1. A: What do you want to do when you leave school?
B: I ____ be a dancer.
2. A: I think the house is on fire!
B: I ___ phone the fire brigade.
3. A: I’ll get the sugar from the cupboard.
B: Watch out! You ___ hit your head on the door.
4. A: Haven’t you finished those letters yet?
B: No’ I ___ stay late and finish them.
5. A: ___ you have another cake?
B: No, thank you, I’ve already had two.
6. A: Do you want to go to the park this afternoon?
B: I can’t – I ___ visit my grandparents.
7. A: This box is very heavy!
B: I ___carry it for you.
8. A: ___ you open the window, please?
B: No, it’s too cold in here.
9. A: Have you bought a birthday present for Sally?
B: Yes. I ___ give her a box of chocolates.
10. A: I’ve lost my pen.
B: I ___ give you one of mine.
11. A: Have you seen Sue today?
B: No, but I expect she ___ telephone me tonight.
12. A: Put your money in your pocket or you ___ lose it.
B: It’s O.K. It’s safer in my bag.
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13. A: Have you decided what to study at university?
B: Yes, I ___ study Biology.
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B: Thanks. I ___ bring it back tonight.
15. A: The house is very dirty!
B: I know. I ___ clean it this afternoon.
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