16

Напишите общую формулу карбоновых кислот

17

Укажите коэффициент перед окислителем в уравнении реакции:

Hg + HNO3 → Hg(NO3)2 + NO2 + H2O

18

Подберите коэффициенты методом электронного баланса в уравнении K2Cr2O7 + SO2 + H2SO4 → K2SO4 + Сr2(SO4)3 + H2O и укажите коэффициент, стоящий в суммарном уравнении перед восстановителем.

19

Укажите заряд анионов, преобладающих в растворе оксида азота (V).

20

В оксиде на 128 частей меди приходится 16 частей кислорода. Найдите формулу оксида. Назовите его.

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Объяснение:

1. Where have you been? Have you been playing tennis?

2. Look! Somebody has broken that window.

3. You look tired. Have you been working hard?

4. “Have you ever worked in a factory?” “No, never.”

5. “Liz is away on holiday.” “Is she? Where has she gone?”

6. My brother is an actor. He has appeared in several films.

7. “Sorry I’m late.” “That’s all right. I have not been waiting long.”

8. “Is it still raining?” “No, has stopped.”

9. I have lost my address book. Have you seen it?

10. I have been reading the book you lent me, but I have not finished it yet. It’s very interesting.

This is a story about little girl Mila, who lived with her granny many years ago. They had a garden with vegetables and fruits, berries, and another things to eat. They hadn't got a fridge, cause it was nearly 100 years ago. But they had a special dark and cold room to save food fresh for a long time. Mila didn't go to this room till she was 10. That is a main idea of the story. One day, granny McDuddle asked:"Mila, please, couldn't you go to cold room to bring me a strawberry jam? I'll cook some pancakes, as you like." Mila loved pancakes. So, she said:"yes, granny" and ran to the room. But only when she came in, she understood how was it frightening, to go deeper into room in darkness. She knew, that there can be bats. She 
really afraided of bats. But she loved pancakes more, so she continued her journey. And, suddenly, she hard a squeak. "Pee-pee-pee", she heard. "Oh, no! It is bat!",- Mila thought. She went closer to noise and saw a small creature, that couldn't fly. It had broken wing. It was scrawling by round. "Oh my God! It is injured!".-Mila said. She toke small bat with two handkerchiefs not to be bitten by frightened animal. She brought bat to her granny, and then to local vet. Since that moment Mila didn't afraid of bats. "The devil isn't so black, how he is drawn",- said granny McDuddle to Mila.