Предмет: Химия, автор: Logvinovanastya

Напишите пожалуйста уравнение
Fe(OH) 2+NaOH=

Ответы

Автор ответа: crdd
0
Fe(OH)2+2NaOH=Na2[Fe(OH) 4]
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Предмет: Математика, автор: sv1253337
ПОМОГИТЕ ПЖ!
вместо K - цифра 12
был бы рад помощи ,даю 35 б.​
6 лет назад
Предмет: Английский язык, автор: Мисудзу
TEST

Past Simple, Present Perfect

Choose the correct answer. There is more than one answer in questions 1-4.



1. Which verb forms are used with the Past Simple?

a. The verb be (was/ were)

b. had + past participle (3rd form)

c. irregular verbs (2nd column of the table)

d. have/has + past participle (3rd form)

e. infinitive + -ed



2. Which verb forms are used with the Present Perfect?

a. irregular verbs (2nd column of the table)

b. have/has + past participle (3rd form)

c. had + past participle

d. have/has + infinitive + -ed

e. irregular verbs (3rd column of the table)



3. Which are typical signal words for the Past Simple?

a. before

b. last week/month/year

c. often

d. yesterday

e. ago

f. yet



4. Which are typical signal words for the Present Perfect?

a. already

b. in 2009

c. ever

d. just

e. tomorrow

f. yesterday



5. Which tense do we use when we talk about experiences or things that happened before now but the result of an action is important in the present?

a. Past Simple

b. Present Perfect



6. Which tense do we use when we talk about actions finished in the past?

a. Past Simple

b. Present Perfect



7. Which tense do we use when we talk about an action began in the past and is still continuing?

a. Past Simple

b. Present Perfect



8. Which tense do we use when we talk about a specific event in the past (we know when the event happened)?

a. Past Simple

b. Present Perfect



9. Jane _____ never studied at university.

a. is

b. was

c. has



10. I _____ school in 2019.

a. have finished

b. was finished

c. finished



11. After three months of hard work, Ann finally _____ a student.

a. has become

b. became

c. did became



12. In his lectures, Professor Johnson _____ visual presentations several times this week.

a. used

b. has used

c. is used



13. ______ bad grades when you were at school?

a. Did you receive

b. Received you

c. Did you received

14. I ______ my project last night.

a. have finished

b. finished

c. had finished



15. Have you had your classes ______?

a. yesterday

b. this morning

c. an hour ago



16. _____ to the library last week?

a. Did you go

b. Went you

c. Did you went



17. I ______ my classmates since last year.

a. didn’t see

b. haven’t see

c. haven’t seen



18. Andrew _____ a strong student at school.

a. have been

b. was

c. were



19. I can’t get into my dormitory room because I _____ my keys.

a. have lost

b. lost

c. have lose



20. When she _____ school, she was well equipped with necessary qualities.

a. has left

b. have leave

c. left
6 лет назад
Предмет: Математика, автор: 212gve2g
Какого числа не хватает?

1=6
2=36
3=216
4=1296
5=
6 лет назад
Предмет: Математика, автор: galin5
Помогите решить уравнение(х-37):29=4
9 лет назад
Предмет: Математика, автор: НяшкаВкусняшка1
Не выполняя вычитания, сравните значение разности. Запишите ответ с помощью одного из знаков >или
9 лет назад