Trả lời :

Tùy theo điểm của những môn kia nữa, họ lấy tổng điểm của tất cả môn xong chia cho số môn

~ Hok tốt ~

theo mình được

Theo mk thì có

Câu 1 : Số đó là :

                  525 : 75% = 700

             3/5 số đó là :

                   700 x 3/5 = 420

Câu 2 : Đổi 48 phút 50 giây = 2930 giây

         Chiều dài đoàn tàu là :

                  12 x 2930 = 35160 ( m )

Câu 3 : Thể tích bể là :

                 6 x 3 x 1,2 = 21,6 ( m khối )

Đổi 21,6 m khối = 21600 l

             Nếu bể ko có nước thì hai vòi cùng chảy số phút để đầy bể là :

                      21600 : ( 30 + 25 ) = 392,72 phút

I/ UNSCRAMBLE THE WORDS

II/ DRAW A LINE TO MATCH EACH QUESTION WITH THE ANSWER

III/ DRAW A LINE TO MACTH THE WORDS THAT GO TOGETHER

VI/ PUT THE QUESTIONS FOR THESE ANSWERS

1. .........................................................................................to the zoo ?

- You can get there by bus.

2. .........................................................................................Phu Quoc Island?

- You can get there by ship.

3. .........................................................................................the post office?

- Go along that street. It's by the lake.

4. .........................................................................................the nearest bookshop?

- Go straight ahead. It's on the right.

5. How .....................................................................................?

- A motorbike rider hit him.

6. .........................................................................................live?

- I live in a village.

7. What's .........................................................................................?

- I'ts beautiful. It's got a lot of parks.

8. ................................... New York ?

-It's modern. It's got a lot of buildings.

9. ..................................................................?

- There will be a robot. I'll use it to do the housework.

10. ...............................................................................?

- I have got a stomachache.

11. ..................................................................free time?

- I go camping and surf the Net.

12. . ..................................................................by plane?

- 2 hours.

13. .................................................................. tomorrow?

- It'll very cold and snowy.

14. . ..................................................................?

- There will be a fridge. I'll use it to keep food fresh.

15. . ..................................................................?

- You should use some eye drops

16. . ..................................................................?

- You may get a burn

17. ..................................................................?

- I Snow White. She's very beautiful.

18. . ..................................................................?

- It'll be a large house. It's got a yard.

19. ..................................................................the cat?

- Because it may scratch his face.

20. . ..................................................................your country?

It's often hot. There is much rain.

V. ANSWER THESE QUESTIONS

1. Where is your hometown? .......................................................................................

2. How often do you get there? ....................................................................................

3. How do you get there? ............................................................................................

4. How long does it take you to get there? ..................................................................

5. What is your hometown ?...................................................................................

6. Where did you go for Tet?.........................................................................................

7. Did you get to your hometown?...............................................................................

8. What are the seasons in the North of Vietnam? .......................................................

9. What are the seasons in the central and the south of Vietnam?..................................

10. What is summer in your country? ..................................................................

11. What is spring in your country?..................................................................

12. What is Autumn in your country?..................................................................

13. What is winter in your country?..................................................................

14. What do you do in your time?..............................................................................

15. What's your dream house be ?..........................................................................

xong , bn làm đi nhé!

mai tui cũng thi

NGUYỄN QUỐC CƯỜNG MAI BẠN CŨNG THI TIẾNG ANH HẢ 

ukm mình kết bạn nhé

kb nha!!

Chào nguyên mai chi , kb nha

nAl = 5,4/27 = 0,2 (mol)

PTHH: 2Al + 3H2SO4 -> Al2(SO4)3 + 3H2

nH2 = 0,2 : 2 . 3 = 0,3 (mol)

VH2 = 0,3 . 22,4 = 6,72 (l)

PTHH: Fe2O3 + 3H2 -> (t°) 2Fe + 3H2O

nFe = 0,3 : 3 . 2 = 0,2 (mol)

a = mFe = 0,2 . 56 = 11,2 (g)

nFe2O3 = 0,3/3 = 0,1 (mol)

mFe2O3 = 0,1 . 160 = 16 (g)

m = 16/60% = 80/3 (g)

mình nhờ bạn giúp mình chuyện này với có gì bạn kb với mình nha

oki k nha bạn cute

xin tiick bạn ưi <3

mình tên là mon, học lớp 4. bọn mik lm bạn bè nhé!

a)

$Fe_2O_3 + 3CO \xrightarrow{t^o} 2Fe +3 CO_2$
$Fe + 2HCl \to FeCl_2 + H_2$
$RO + H_2 \xrightarrow{t^o} R + H_2O$

b)

Coi m = 160(gam)$

Suy ra:  $n_{Fe_2O_3} = 1(mol)$
Theo PTHH : 

$n_{RO} = n_{H_2} = n_{Fe} = 2n_{Fe_2O_3} = 2(mol)$
$M_{RO} = R + 16 = \dfrac{160}{2} = 80 \Rightarrow R = 64(Cu)$
Vậy oxit là CuO