Предмет: Химия, автор: Аноним

Изомер вещества, формула которого CH2=CH-CH2-CH3 это
а) 2-метилбутен-2
б) бутен 2
в) бутан
г) бутин 1

Ответы

Автор ответа: alex02101997
7
Изомер б) бутен-2, вид изомерии - положение двойной связи.
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ПОМОГИТЕ СРОЧНО, ПОЖАЛУЙСТА

III. Choose the right form of the predicate in italics as if you were to translate the following
sentences into English:
21.Он болел уже неделю, когда родственники послали за врачом.
a) had been ill b) was ill c) were ill d) has been ll
22. Хотя Том клеил обои весь день, он согласился пойти на концерт.
a) agreed b) had agreed c) was agreed d) has agreed
23. На прошлой неделе Алиса ходила в бассейн.
a) went b) goes c) was going d) had gone
24. Вчера он два часа готовился к контрольной работе.
a) was preparing b) had been preparing c) prepared d) had prepared
25. Секретарь сообщил, что уже отправил факс в Лондон.
a) has sent b) had sent c) was sending d) sent
26. Она закончила доклад, над которым так долго работала.
a) worked b) had been working c) was working d) were working
27. Это произошло в Лондоне в 1995 году.
a) had happened b) was happening c) happened d) happens
28. Люди прождали целый час, прежде чем пришел автобус.
a) were waiting b) was waiting c) had been waiting d) waited
29. Они обсуждали новости, которые только что получили.
a) received b) have received c) has received d) was receiving
30. Когда выключили свет, он принимал душ.
a) took b) were taking c) had taken d) was taking
IV. Put the verbs in brackets into one of the past tenses:
31. Ann _______ (not/ pick up) the phone because she _______ (deal with) another customer
when it rang.
32. While he ______ (travel) in South Africa, he ______ (get) the idea for his new movie.
33. It ______ (rain) yesterday.
34. It ______ (rain) all day yesterday.
35. When we returned from London it ______ (rain) for 3 hours.
36. When we returned from London it ______ (not/rain) any more.
37. He ______ (graduate from) the University before he ______ (move) to Moscow.
38. He ______ (graduate from) the University last year.
39. When he came home his family ______ (wait for) him.
40. They ______ (drive) all night when finally they saw the lights of a big city.