03.09.2022 05:27

Химия

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C2h6-c2h5cl-c2h4-ch3-ch2-br
Как решить цепочку превращений

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WoRT1

Химия

4,4(26 оценок)

Объяснение:

Task 1. Match the words with the opposite meaning.

1. moral a) undrinkable

2. drinkable b) shy

3. to support c) quiet

4. intense d) to bully

5. to appear e) contrary

6. similar f) to disappear

7. confident g) immoral

Task 2. Put in THE in the sentences where necessary.

1) … Mississippi is the longest river in … Northern America.

2) … Fuji is an extinct volcano and the highest mountain of … Japanese Islands.

3) … UK consists of Great Britain and … Northern Ireland.

4) … Bahamas are a group of islands in … Atlantic Ocean.

5) One of the natural attractions in … Canada is … Lake Superior.

Task 3. Choose one of these modal verbs from the box to complete the sentences.

There is one EXTRA verb.

can may should must could

need

1. When I was a little girl, I ________ do acrobatic tricks, but now I can’t.

2. If there is not going to be any information about those passengers till tomorrow morning, we ______ call the police.

3. Conflicts _______ lead to bad relations.

4. We _____ have respect for other people.

5. Do you know that cats _____ see in the dark?

Task 4. Choose the most appropriate options to fill in the gaps.

I _______ (1) that emergency call nearly midnight. “My three kids ___________ (2) not at home yet,” - a worried male voice informed the emergency service. The man explained that his two sons, Allan, 15, and Johnny, 13, and their twelve-year-old cousin Jack _______ (3) for a bicycle ride and there was no sign of them yet. The man sounded very nervous, as he suspected that something ________ (4) to the boys. No doubt, they ________ (5) in trouble. The rescue party headed right there.

The rescuers saw the boys soon. They _______ (6) down the hill. They were walking very slowly. Two of them were helping the third boy – his leg _______ (7) and he was screaming with pain. Later he told us that they had been practicing extreme cycling. Unfortunately, things like that ________ (8) quite often. I _______ (8) for the emergency center for more than five years and have seen lots of kids suffering from their extreme. They often ignore safety rules, and get injured or worse. They cannot realize that without a very careful preparation any extreme sport is a _______ (10) activity.

ВСТАВЬТЕ ЭТИ СЛОВА В ТЕКСТ.

1. a) receive b) received c) have received d) had received

2. a) are b) was c) were d) had been

3. a) left b) was left c) have left d) had left

4. a) happened b) had happened c) is happening d) has happened

5. a) is b) was c) were d) are

6. a) move b) are moving c) had moved d) were moving

7. a) was broken b) has been broken c) is broken d) broke

8. a) happen b) are happening c) have happened d) will happen

9. a) work b) am working c) was working d) have been working

10. a) danger b) dangerous c) dangerously d) endangered

DIlyus

Химия

4,6(84 оценок)

c2h6=c2h4+h2 при катализаторе (pt, pd, ni, fe, cr2o3, fe2o3, zno) и нагревании

c2h4=c2h2+h2 при катализаторе (pt, pd, ni, fe, cr2o3, fe2o3, zno) и нагревании

3c2h2=c6h6 при катализаторах (pd/pbo/caco3)

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