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CH4 + 2O2 -> CO2 + 2H2O

m CO2 = 9,916:22,4:2x44=38,95g

m H2O = 9,916:22,4x18=7,968g

V CH4 = 9,916:2=4,958l

1) daily

2) health

3) ?

4) difference

5) disagree

a) 2KMnO4 -> K2MnO4 + MnO2 + O2

V O2 = 47,4 : 158 : 2 x 22,4 = 3,36 l

b) 2Mg + O2 -> 2 MgO

m MgO = 0,15 x 2 x 40=12g

1) Ancol tác dụng được với kim loại kiềm

2) Ancol có thể tạo ra ete

3) Ancol có thể tác dụng với axit

1 The friends we met / when we met / whose we met / we met whom at university are coming to visit next week.

2 Mr. Jackson whom son / Mr. Jackson whose son / Mr. Jackson, whose son / Mr. Jackson who son also goes to this school, will be attending the party next weekend.

3 It is easy to see the reason that / the reason which / the reason why / the reason he has succeeded.

4 We need to look at this proposal very carefully after we have made a decision / before we make a decision / after we are making a decision I before we will make a decision

5 After I had done / After had I done / After I have done / After I would do the washing up, Maria put the dishes away.

6 Let's wait here no sooner it stops raining / by the time the rain will stop / until it stops raining / when the rain will stop

7 Soldiers must go for wherever the army assigns them / wherever the army assigns them / in where the army assigns them / as much as the army assigns them

8 That state is at least twice as big as / as twice big as / as two times big as / as big as twice England.

9Many people / More people / As many as people / People more live in the capital than in the the rest of the country.

10 The fruits of the tropics are more varied as those of temperate regions / as varies than the fruits of temperate regions / more varied than that of temperate regions / more varied than those of temperate regions

11 I think New York is one of more wonderful/ most wonderful / the most wonderful / as much wonderful as cities in the world

A. their

Fe + 2HCl -> FeCl2 + H2

n H2 = nFe = 11,2:56=0,2 mol

V H2 = 0,2 . 22,4 = 4,48l

135:56=2 dư 23

Chỉ có phương trình 2H2 + O2 -> 2H2O thôi nhé!

A. Cooc di e

B. 178,9 gam

-28/35 và 30/35

2. I don't like maths. There are several reasons for that
→There are several reasons why I don't like Maths.
3. My friend has decided to buy a motorbike. His bicycle was stolen last week.
→My friend, whose bicycle was stolen last week, has decided to buy a motorbike.
4. The man is my former teacher. He gave you a lift last night(who)
→The man who gave you a lift last night is my former teacher.
5. You should ride your bike carefully, or you may have an accident.
→If you don't ride your bike carefully, you may have an accident.
6. She can't join the party because she has to study.
→If she didn't have to study, she could join the party.
7. I can speak both English and French perfectly. (Bilingual)
→ I'm a bilingual who can speak both English and French perfectly.
8. They are looking for the girl and her dog.They have lost the way in the forest. (that)
→ They are ?
9. I have a friend. Her mum is a volunteer worker (whose)
→I have a friend whose mum is a volunteer worker.
10. Study harder, or you will fail the exam.
→ If you don't study harder, you will fail the exam.

1. A

2. C

3. A

4. A

5. A

6. D

7. A

8. A

9. C

10. B

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