Предмет: Химия, автор: Натали22

срочноооо!!!! помогите с химией пожалуйста!!!!

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Ответы

Автор ответа: IrVB

1-б, 2-б, 3-а, 4-в, 5-б, 6-б,
7 - а2, б4, в1, г3
8 - а4, б2, в1, г3
9 - а3, б4, в2, г1
остальное попозже
10 - а4, б1, в3, г2
11 Задача
Уравнение 2С2Н2 + 5О2 = 4СО2 + 2Н2О
молярная масса ацетилена 26 г/моль, отсюда количество вещества 5,2:26 = 0,2 моль
Количество кислорода соответственно 0,5 моль. Объем кислорода 22,4 * 0,5 = 11,2л. Воздуха требуется в 5 раз больше 11,2 * 5 = 56 л.
12 Пишу только молекулярные уравнения
С6Н12+Н2=С6Н14
С6Н14 = С6Н6 + 4Н2
С6Н6 + Br2 = C6H5Br + HBr

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Past Simple и Past Continuous

Тест на сравнение Past Simple и Past Continuous.
Выберите правильный ответ:

1. He usually meets his sister on Fridays but he ___ her last Friday.

а) weren’t visiting
b) didn’t visit
c) wasn’t visiting

2. Why ___ for so long yesterday?

A) did the baby crying
B) did the baby cry
C) was the baby crying

3. I ___ to be a pilot when I was young.

A) was wanted
B) wanted
C) was wanting

4. Kelly ___ near the river at 4 p.m. yesterday.

A)were sunbathing
B) was sunbathing
C) sunbathed

5. I felt sick yesterday. I ___ something rotten.

A) ate
B) were eating
C) was eating

6. My grandma ___ apple trees while she lived in the country.

A) planted
B) was planting
C) were planting

7. We were in a difficult situation. We ___ what to do.

A) not know
B) were not knowing
C) didn’t know

8. The train ___ on time yesterday.

A) arrived
B) was arrive
C) was arriving

9. Darrel couldn’t find his old hat. His sister ___ it away long time ago.

A) throwed
B) threw
C) was throwing

10. Madonna ___ popular when she was young.

A) was becoming
B) was become
C) became

11. Titanic ___ in the Atlantic many years ago.

A) sinked
B) was sinking
C) sank

12. Agatha Christie ___ a lot of detective stories.

A) was writing
B) were writing
C) wrote

13. What ___ at 6 p.m. yesterday?

A) did you do
B) were you doing
C) was you doing

14. I ___ for the way out of the centre but couldn’t find it.

A) looked
B) was looking
C) were looking

15. The firm went bankrupt and I ___ my job.

A) was losing
B) losing
C) lost

16. Greg ___ in a test when his teacher noticed it.

A) was cheat
B) cheated
C) was cheating

17. At the time Jack returned home from England, his father ___ in the Baltic Sea.

A) was sailing
B) were sailing
C) sailed

18. When ___ lobsters?

A) was you last eating
B) did you last eat
C) did you last eating

19. The editor of the magazine ___ to print the article.

A) wasn’t allowing
B) didn’t allow
C) weren’t allowing

20. The bike is ok now. My dad ___ it yesterday.

A) were repairing
B) repaired
C) was repair