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.
2. Henri said to me that the teacher was listening them
3. Bob said to Tom that he had made no mistakes in the dictation before
4.I told the policman that I had seen the thief in the garden
5. He said that he had not read many English books
6. Bill's father said to him that he hadn't cleaned his hoes
7. Mary said she didn't want to wear her old dress
8. My friends told me that we had plenty of time done our work
9. I said to my siter that i hadn't seen my uncle for a long time