Câu 1:Cho kim loại kẽm tác dụng với axit clohidric(HCL) thì thu đc sản phẩm là kẽm clorua(ZnCl₂) và khí hidro

a,Lập PTHH của phản ứng trên (làm đc r)
b,Nếu có 6.10²³ nguyên tử Zn phản ứng thì sinh ra bao nhiêu lít hidro (đktc),bao nhiêu gam kẽm clora?
Câu 2:Trong muối tạo bởi hai nguyên tố là Fe và S,trong đó khối lượng nguyên tố Fe nặng gần bằng \(\frac{7}{8}\) nguyên tố S.xác định CTHH của muối trên biết CTHH muối này trùng với công thức đơn giản nhất

Câu 3:Hãy tính tỉ khối của hỗn hợp B chứa 1,2.10²³ phân tử N₂ và 3,6.10²³ phân tử CO so với không khí

Hoàn thành các PTHH sau :
20,Fe_xO_y+CO→FeO+CO₂

21,Fe₂+CO→Fe_xO_y+CO₂

22,Fe_xO_y+HCl→.....+H₂O

Tìm và chữa lỗi

1, He let the letter falling on to the floor

2, What do you use to do felt

3, Lan wish she can buy a car

4, This is the first time she forgot to give me a message

5, we reached the nearest village after walk for five hours

6,if i will have to make a difficult decision ,i will discuss it with my parent

7,what about use pulic buses instead of motobikes

8,if you called me i will explain the home work to you

9,if i have a car i would drive it to work

10,my father dislikes to play volleyball in evening

11,she promises talking me to zoo with her next sunday

12,when we look out of the window ,we saw him

13,i heaven't heard from maria since a long time

14,she wishes she is the most beautiful girl in the world

15, he has waited for you for 9o'clock this morning

viết lại câu

1,i am sick today ,so i don't go to class --> if

2,there isn't a river in my village.we can't go swimming -->if

3,i don't have enough money.i can't go swimming everyday -->if there

4,work harder or you won't pass the exam -->if you

5,tom has so many accidents because he is so clumsy -->if

6,listen to the teacher please or you can't understand the lesson -->if

7,i think you should surf the internet for more in for mation -->if

8,it is raining, so we can't finish the game -->if

9,hurry up or you miss the bus -->if you don't

10,he doesn't get high marks because he is lazy -->if he

11,the office may be closed,so mark won't be able to get in -->if

12,i don't know to control this machine -->i wish

13,it started raining an hour ago -->it has

14,she last visited herparents last sunday -->she has

15,i study engish badly -->i wish

chia V

1,if she (study) harder,he will pass the exam

2,if the sun (stop) shining,what would happen to uor planet ?

3,he would have a lot of friends if he (not be )selfish

4,if lan (know) the answer,she would help us finish our test now

5,if we reuse botteles and cans ,we (reduce) a large number of garbage

6,if there (not be )electicity,pepe can't not use household appliances

7,if he (finish )the work in time ,he will go to the ball game

8,if you (turn) out the light,we will be in the dark

9,if you don't hurry ,we (be) late for work