С образованием осадка азотная кислота реагирует с 1 карбонатом калия 2 сульфатом меди 3 силикатом натрия 4 Сульфитом натрия Спасибо! - №14939424

С образованием осадка азотная кислота реагирует с
1 карбонатом калия
2 сульфатом меди
3 силикатом натрия
4 Сульфитом натрия

Спасибо!
- Предмет:
  Химия
- Автор:
  evony
- 6 лет назад

Ответы 1

2HNO3 + Na2SiO3 = 2NaNO3 + H2SiO3↓
- Автор:
  fabiánweaver
- 6 лет назад
- 0
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Какой из данных ниже выражений при любых значениях k равно 2^(k-3)?
1)2^k/2^3 2) 2^k/2^-3 3)2^k-2^3 4) (2^k)^-3

объясните решение пожалуйста
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Пожалуйста помогите с англ.яз
Прошедшее совершенное время(The Past Perfect Tense)

Exercise 1. Complete the sentences putting the verbs in brackets in the Past Perfect Tense.
Example: when we arrived at the station. Our train had already left (already / leave)
1. When he arrived at the theatre, the play __. ( already / leave)
2. The patient __ (die) by the time the doctor arrived.
3. As soon as they __ (go), I went straight to bed.
4. I suddenly remembered that I __ (forget) my keys.
5. When I came to the post office, it __. (already / close)
6. When Polly went back to the shop, they __ (already / sell)the book she wanted.
7. I spoke to the woman because I __ (meet) her somewhere before.
Exercise 2. Make these sentences into general questions. Give short an-swers.
1. The sun hadn’t risen before they started a journey.
2. Before Julia went home, she had finished her work.
3. She hadn’t done all the shopping when she suddenly felt sick.
4. He had spoken to the boss before he decided to leave.
5. Before we had supper, the children had gone to bed.
6. He had stayed in his father’s farm till his father died.
7. Philip hadn’t seen the girl before.

Exercise 3. Rewrite the following sentences as positive, negative or a general question, according to the instructions.
1. My sister had already gone to bed the time I got home.
(negative)
2. After he hadn’t phoned his grandparents, he felt much better about every-thing. (positive)
3. Hank hadn’t tried on several T-shirts before he chose the one he liked most. (positive)
4. Clark had looked through a list of racing horses before he decided to bet his money on the Morning Dew. (question)
5. I had finished the letter when I realized it was too late to post it. (negative)
6. As soon as Leo hadn’t given up smoking, he looked much healthi-er.(positive)
7. Ted’s father had advised him not get married till he was 35. (question)
- Предмет:
  Английский язык
- Автор:
  yusuf
- 6 лет назад
- Ответов:
  
  1
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Реши уровнение:
1564-(m×235)+7896=?
- Предмет:
  Математика
- Автор:
  bailey
- 6 лет назад
- Ответов:
  
  3
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помогите пожалуйста,срочно надо с подробным решением.Сколько цветов будет содержать палитра,если каждый базовый цвет кодировать 7 битами?
- Предмет:
  Информатика
- Автор:
  lucas
- 6 лет назад
- Ответов:
  
  1
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How much to ban the user?

1 hour 1 day 100 years