26. D

27. A

28. D

29. B

30. A

1. A

2. A

3. A

4. A

5. D

6. A

7. D

8. D

9. A

10. A

C2H5OH + O2 ---^{men giấm}--> CH3COOH + H2O

2CH3COOH + 2Na ----> 2CH3COONa + H2

b.

CaC2 + 2H2O ---> C2H2 + Ca(OH)2

C2H2 + H2 -xt,t^o--> C2H4

C2H4 + H2O ---> C2H5OH

2C2H5OH + Na ---> 2C2H5ONa + H2

số e: 8

ĐTHN: 8+

số lớp e: 2

số e lớp ngoài cùng: 6

trong chu kì 2: N<O<F

trong nhóm VI: O>S

đề là 1g Hidrocacbon A đk??

14. His mother wishes he cought good at marks

15. solar energy was possible to store for a number of days.

B

1. It's a small shop which they sell vintage records.

2. Emily has been in lots of TV commercials who is a model.

3. George Clooney is an American actor who endorses nespresso coffee.

4. Mary's dad is very polite who is a professional photographer.

5. That TV commercial won the award that advertised jeans.

6. The hotel burnt down where they shot the gangster film there.