Предмет: Химия, автор: BiggieSmall

1)Составить молекулярное уравнение
Ca²⁺ + CO₃²⁻ = CaCO₃
2)Определить молекулярную конц-ию рН раствора HCl, если конц-ия гидроксид-ионов равно 10⁻¹⁴ моль/кг
3)Определить растворимость в моль/л и г/л труднораств. соединения:
СuI (ПР=1,110⁻¹²)
4)Образуется ли осадок труднораств-го соед-ия при смешивании равных объёмов растворов электролитов с указанной концентрацией:
NiSO₄ + Na₂S концентрация:0,0002 моль/л (ПР:a-NiS: 3,210⁻¹⁹)

Ответы

Автор ответа: katiagonchar20p8pu2v

1. Ca(NO3)2 + H2CO3 = CaCO3 + 2HNO3
Ca^2+ + 2NO3^- +2H- + CO3^2- = CaCO3 (осадок) + 2H^+ + 2NO-
Ca^2+ + CO3^2- = CaCO3

Похожие вопросы

Предмет: Английский язык, автор: lolifarm4

Помогите пожалуйста
GRAMMAR

IV. Choose the correct item.

Hot dogs are …. than hamburgers.

better B. best C. good

2. This is the ______ kitchen I've ever seen.

A. dirtiest B. dirtiest C. dirty

3. It was …. restaurant I've ever been to.

A. more expensive B. expensive

C. the most expensive

4. How …….people went to the meeting at school?

A. many B. much C. any

5. Well, there …….about forty people there

A. are B. was C. were

6. In fact, Room 6 wasn't ……. so we moved to Room

A. big enough B. enough big C. biggest

7. It's …… than Room 6.

A. bigger B. more big C. biger

8. Andy Did ……. teachers go to the meeting?

A. some B. much C. any

9. Yes, they did. Mr Smith told us about the football team. They are …… than last year.

A. more good B. better C. gooder

10. In fact, they are the ……. successful team in the school's championship.

A. most B much C. more

Statement

1

2

3

4

5

6

7

8

9

10

Answer

V. Choose the correct item.

What …. about Ann?

do you think B. are you thinking C. you think

I don’t like her. She …. to people.

is always lying B. always lies C. is lying always

The concert …. at 7.00 p.m. Do you want to go to the dinner before that?

starts B. is going to start C. is starting

He …. Nick and Mary for coffee yesterday, because they were too busy.

didn’t meet B. don’t meet C. didn’t met

Ann … the flowers while Mark was cleaning out the garage.

waters B. has watered C. was watering

Tina …. chopping the vegetables yet.

didn’t finished B. hasn’t finished C. doesn’t finish

Statement

1

2

3

4

5

6

Answer

WRITING

VI. Put the parts of this letter in the correct order (Part1- Part9).

A. Anyway, I've got to go now. Unfortunately, loads of homework.

B. I'm sorry to hear you've had an argument with your best friend and that you're not speaking at the moment. Yes, it has happened to me too, and it's awful, isn't it?

C. Mary

D.24th September

E. Dear Ann,

F. Write back soon!

G. Thanks for your letter. It was great to hear from you! Well done on passing your exams!

H. I think you need to ask yourself one question: what's more important- that argument or your friendship? I remember when I asked myself that it all became clear. I realized my friendship with Chris was far more important. I called him immediately and told him. We became friends again immediately. Maybe you should do the same thing. Let me know what happens! Good luck!

I. 23 Lenin Street

Surgut Russia

628400

Part

1

2

3

4

5

6

7

8

9

5 лет назад

Предмет: Английский язык, автор: lakreevcom

1.My brother does his homework every day.2.Yesterday I received a letter from my friend.3.My cousin will visit us next summer. 4.Our team was playing football all day.5. He had read the book before the telephone rang.6.Jane bought an interesting book last Tuesday.
Помогите пожалуйста перевести эти предложения в passive voice на английском языке , очень срочно, буду очень благодарен!

5 лет назад

Предмет: Математика, автор: kirilltsytsorin

За 2 часа квадроцикл проехал 96 км, а велосипедист за 6 часов проехал 72 км. Во сколько раз квадроцикл двигался быстрее велосипедиста? срочно!!

5 лет назад

Предмет: Математика, автор: Лиза4436

реши уравнения x*82=8054-674

9 лет назад

Предмет: Математика, автор: Марина26рус

как замкнуть ломаную со сторонами 5см 3мм; 2см 8мм; 8см так, чтобы получился четырехугольник

9 лет назад