Предмет: Химия, автор: yliakaragyaur

обчисліть молекулярну масу фосфатної кислоти H³PO⁴​

Ответы

Автор ответа: lizagrugorieva163412
0

Ответ:

Mr(H3PO4) = Ar(H) * 3 + Ar(P) + Ar(O) * 4 = 1.00794 * 3 + 30.973762 + 15.9994 * 4 = 96.995182

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Вставь have или has .

You ___ helped your mother.

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John (paint) two pictures.

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She (do) her homework

He (make) animals from clay.

3 Раскрой скобки используя Present Perfect

___ you (roller-skate) ?

___ Jack (watch) TV ?

___ your friends (buy) gifts ?

___ Jane (swim) in the river ?

___ you (go) boating ?

___ the children (help) their mother ?

___ Sparky (eat) the flower ?

4 Исправь ошибки

1 I has worked.

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1Вставь have или has .

You ___ helped your mother.

I ___ drawn a picture.

My mother ___ made a pudding.

My father ___ repainted the cupboard.

My parents ___ cleaned the carpet.

The friends ___ drawn a poster.

We ____ repainted the door.

They ____ washed the dishes.

Раскрой скобки и поставь глагол в Present Perfect

John (paint) two pictures.

Jill (feed) her hamster.

The children (play) computer games.

I (open) the window.

She (do) her homework

He (make) animals from clay.

3 Раскрой скобки используя Present Perfect

___ you (roller-skate) ?

___ Jack (watch) TV ?

___ your friends (buy) gifts ?

___ Jane (swim) in the river ?

___ you (go) boating ?

___ the children (help) their mother ?

___ Sparky (eat) the flower ?

4 Исправь ошибки

1 I has worked.

2 She not helped her parents.

3 Jack has bought a new car?

4 What they have painted?

5 Helen not has changed her bedroom.

6 His father put books in the bookcase.