đề nó lạ lạ=)

1D

2A

3D

4C

a.

nFe = 19,6/56 = 0,35 (mol)

Fe+H2SO4 -- > FeSO4 + H2

0,35 -> 0,35  ----> 0,35- --> 0,35 (mol)

VH2 = 0,35.22,4 = 7,84(l)

b

mddH2SO4 = ( 0,35.98.100% ) / 25% = 137,2(g)

A

three,four,six là danh từ chỉ số đếm

Lan’s parents (1) ___live___ in Nha Trang now. Her father is (2) ___an___ engineer. He works in a factory. He works (3) __from_____ 8 a.m to 4.30 p.m. Her mother is a doctor. She always takes (4) _____care__ of sick people in the hospital near her home. She often works from 2 p.m (5) __to____ 10 p.m, but sometimes she has to work at night. Lien has a (6) _brother____ and a sister. They are both students. They study at Da Nang University. Now. Lien is staying (7) __with____ her aunt in Hanoi. She misses her family a lot. She’ll come (8) ___back___ home next Sunday.

1.    1 I (be) ____am____ at school at the weekend.

2.     She (not study) _____does not study___ on Friday.

3.     My students (be not) ___are not_____ hard working.

4.     He (have) __has______ a new haircut today.

5.     I usually (have) __have______ breakfast at 7.00.

6.     (live) _____Does she live___ in a house?

7.     Where (be)__are__ your children?

8.     My sister (work) ____works____ in a bank.

9.     Dog (like) ____likes____ meat.

10.                        She (live)_____lives___ in Florida.

11.                        My brother always ______makes__ Saturday dinner. (make)

12.                        Ruth ____does not eat ____  eggs;

13.                        they __make______  her ill. (not eat; make)

14.                        "Have you got a light, by any chance?"

15.                        "Sorry, I___do not smoke_____" ( not smoke)

16.                        ____Does____  Mark ___go_____  to school every day? (go)

17.                        _____Do___  your parents ___like_____  your boyfriend? (like)

18.                        How often __do______  you ____go____ hiking? (go)

19.                        Where _____does___  your sister ___work_____? (work)

20.                        Ann ______does not__  usually ______have__  lunch. (not have)

21.                        Who _____does___  the ironing in your house? (do)

22.                        We ____hang____  out once a week. (hang)

23.                        My friend is finding life in Paris a bit difficult. He ____does not speak__ (speak) French.

24.                        Most students live quite close to the college, so they _____walk___ (walk) there every day.

25.                        How often __do______ you ______look__ (look) in a mirror? 

26.                        I've got four cats and two dogs. I  ___love_____ (love) animals.

27.                        No breakfast for Mark, thanks. He ____eats____ (eat) breakfast.

28.                        What's the matter? You ___look_____ (look) very happy.

29.                        Don't try to ring the bell. It ____doesn't work____ (work).

30.                        I hate telephone answering machines. I just ____like____(like) talking to them.

31.                        Matthew is good at basketball. He ___wins_____ (win) every game.

We always travel by bus. We __don’t own______ (own) a car

1.    1 I (be) _____will be___ at school at the weekend.

2.     She (not study) ____doesn't study____ on Friday.

3.     My students (be not) ___aren't_____ hard working.

4.     He (have) ____has____ a new haircut today.

5.     I usually (have) ____have____ breakfast at 7.00.

6.     She (live) ___Does she live_____ in a house?

7.     Where (be)__are__ your children?

8.     My sister (work) _____works___ in a bank.

9.     Dog (like) _____likes___ meat.

10.                        She (live)___lives_____ in Florida.

11.                        My brother always ___makes_____ Saturday dinner. (make)

12.                        Ruth ____doesn't eat____  eggs 

13.                        they ____make____  her ill. ( make)

14.                        "Have you got a light, by any chance?"

15.                        "Sorry, I_____haven't smoked___" ( not smoke)

16.                        ______Does__  Mark ______go__  to school every day? (go)

17.                        _____Do___  your parents _____like___  your boyfriend? (like)

18.                        How often __do______  you _____go___ hiking? (go)

19.                        Where _____does___  your sister ____work____? (work)

20.                        Ann ______doesn't__  usually ____have____  lunch. (not have)

21.                        Who ______does__  the ironing in your house? (do)

22.                        We ____hang____  out once a week. (hang)

23.                        My friend is finding life in Paris a bit difficult. He ____doesn't speak____ (speak) French.

24.                        Most students live quite close to the college, so they _____walk___ (walk) there every day.

25.                        How often __do______ you ___look_____ (look) in a mirror? 

26.                        I've got four cats and two dogs. I  ____love____ (love) animals.

27.                        No breakfast for Mark, thanks. He ___ate_____ (eat) breakfast.

28.                        What's the matter? You ____look____ (look) very happy.

29.                        Don't try to ring the bell. It _____doesn't work___ (work).

30.                        I hate telephone answering machines. I just _____like___(like) talking to them.

31.                        Matthew is good at basketball. He ___wins_____ (win) every game.

We always travel by bus. We ____don't own____ (own) a car

=>2-x=168

=>x=-166

độ dài thật

4x12 000 =48 000cm =480 m

đ/s:....