Предмет: Химия, автор: html3irenka11

помогите
Нужно добрать коэффициенты
Al+Br2 __ AlBr3
Rb+O2__PbO4
FeO+O2__ Fe2O3
Zn+HCl__ZnCl2+H2
Cl2H6+O2__CO2+H2O
PbCl2+NaS__PbS+NaCl

Ответы

Автор ответа: Маханька
0
2Al+3Br₂⇒2AlBr
Pb+2O
₂⇒PbO
6FeO+O
₂⇒2FeO
Zn+HCl
ZnCl+H₂↑
C
H+O₂⇒CO₂↑+HO
PbCl
+NaSPbS+2NaCl
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Помогите решить тест пожалуйста)))
TEST 2
1. Alice said that her parents _____ back in a week.
a) would come b) have come
c) comes d) will come
2. After I _____ the letter, I started to cry.
a) had read b) am reading
c) has read d) were reading
3. The plane _____ in thirty-five minutes.
a) have left b) are leaving
c) had left d) is leaving
4. I went by train and _____ at the station by my aunt.
a) meets b) meet
c) was met d) is met
5. It _____ to us how the accident had happened.
a) is explaining b) shall be explained
c) was explained d) has explained
6. He didn’t see me as he ______ when I came into the room.
a) has read b) is reading
c) read d) was reading
7. Mother will cook dinner when she ______ home from work.
a) come b) comes
c) will come d) has come
104
8. Oh, here you are. I ______ for you for half an hour.
a) have been waiting b) am waiting
c) waited d) has been waiting
9. I ______ my work by the end of June.
a) shall finish b) have finished
c) finish d) shall have finished
10. His smile was something she ______ before.
a) did never see b) has never seen
c) had never seen d) never saw
11. You ______ a lovely song when I entered the room. What was it?
a) was singing b) had sung
c) sang d) were singing
12. Unemployment among young people ______ constantly.
a) increased b) is increasing
c) had increased d) has increased
13. The workers ______ the road by the end of the year.
a) will have built b) will build
c) will have been built d) will be building
14. Have you ever been to England? Yes, I ______ there last year.
a) was b) had been
c) have been d) was being
15. When my friend rang me up, I ______ TV.
a) had been watching b) was watching
c) had watched d) watched