Сокращенному ионно-молекулярному уравнению Cu2+ +S2- =CuS↓ соответствует взаимодействие пары веществ: а) CuCl2 + H2S

б) Cu (OH)2 + Na2S

в) CuO + H2S

г) CuSo4 + Na2S

Say what you think these people are going to do.

1. Peter is in the bathroom. The water is running.

2. Alice is in the kitchen. A cup of coffe and a sandwich are on the table.

3. Paul is sitting in the armchair. He is opening a book.

4. Anna is in the shop. She likes a large beautiful mirror.

5. John and Jane are wearing tennis clothes and they have their tennis rackets in their hands.

6. Frank is standing near the bookcase with a book in his hand. His other hand is on the bookcase door.

7. Mother is in the kitchen. In the sink there are a lot of cups and glasse which are a not clean. The water is running.

8. Some boys and girls are one of them has a football.

3. Не является окислительным процессом:

а) дыхание;          б) взаимодействие СuО и Н2;     в) горение;        г) гниение.

4. По какой реакции нельзя получить кислород?

а) СаСО3    →                      б) Н2О→

Найти массу 20 литров углекислого газа,находящегося при давлении 15 кПа и температуре 17 градусов.

Приведите примеры регионов и стран мира, которые в начале ХХI в. находятся на разных этапах этого перехода.