арина256545

27.04.2020 21:44

Химия

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Яка маса осаду сульфату барію утворюється при взаємодії сульфату натрію з 2,61 г нітрату барію?

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Ответы на вопрос:

Viola2801

Химия

4,4(57 оценок)

Объяснение:

1. Put the verbs in brackets into the Present Simple of Present Continuous.

1) The plane _______ (set) off in 5 minutes.

2) He _______ (go) to the party tonight?

3) She _______ (know) him well?

4) They _______ (have) the dinner tomorrow evening?

5) Jane usually _______ (play) soccer on Mondays after school.

2. Complete the sentences with the correct present forms of the verbs in brackets.

1) She ___ (cook) the dinner during three hours.

2) ___ (your friend like) basketball?

3) I ___ (not hear) from you recently.

4) We ___ (already/buy) the tickets for the new show.

5) I _____ (do) my homework now.

3. Choose the correct answer.

1) Sarah ___ for a new flat at the moment.

2) He___ tennis every day.

3) She __ her homework for 2 hours.

4) They ___ for a new one at the moment.

5) Jane ___at the library for ten years.

1) looks

has been looking

is looking

2) play

has played

plays

3) has done

is doing

has been doing

4) look

have been looking

are looking

5) has been working

has been worked

have been working

4. Match the tenses and time markers.

1) Present Simple a) Yet, already, since

2) Present Continuous b) For, all day

3) Present Perfect c) Usually, never , often, sometimes

4) Present Perfect Continuous d) Now, these days

5. Choose the correct answer.

1) This man is a writer. He has written/writes books.

2) He is writing/has been writing books for 10 years.

3) She always helps/has been helping her mother about the house.

4) He is already writing/has already written 10 books.

5) Is he playing/Has he played chess at the moment?

Put the verbs in brackets in the correct form.

1) Today Sue ________ (help) her mother all morning.

2) They already ________ (wash) the floor.

3) Now we ________ (cook) dinner together.

4) They ________ (work) in the local store.

5) They ________ (work) there for three hours.

7. Choose the correct answer.

1) She is dusting/has been dusting the furniture for an hour.

2) The climate has changed/changes lately.

3) He are /is not tired at the moment.

4) How are you doing/is you doing now?

5) She has just bought/has just buying the new dress.

8. Choose the correct answer.

1) ______________ (you already find) your notebook?

2) Lisa _______ (be) a good girl.

3) He ___________ (forget) to write an essay for today.

4) I _________ (look) for his book at the moment.

5) I ___________ (cook) the dinner for 2 hours.

1) Have you already found

Do you already find

Having you already find

2) are not be

have to be

3) have forgotten

forgets

has forget

4) is looking

looks

have looked

5) have been cooked

have been cooking

am cooking

kostynbai

Химия

4,5(87 оценок)

ответ: 1 ba(oh)2+na2co3

2 naoh+k2so4

3 koh+baso4

4 fe(oh)2+kno3

5 koh+mnco3

6 h2o+ni(no3)2

7 ca(oh)2+baco3

объяснение:

там ще треба розставити коефіцієнти

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