( Mn giải thích giúp em vs ạ )

Hãy chọn dãy công thức hoá học đúng :
A. KCl, Fe(OH) 3 , H 2 SO 4 , BaPO 4
B. CaCO 3 , Ag 2 NO 3 , SO 4 , Ba 2 (PO 4 ) 2
C. CaCl 2 , Al(OH) 3 , HNO 3 , Ba 3 (PO 4 ) 2
D. Na 3 PO 4 , MgSO 4 , Cu(OH) 2 , Ba 3 (PO 4 ) 3

( Mn giải thích giúp em vs ạ )

Tổng số hạt trong nguyên tử X là 40, trong đó số hạt mang điện là 22. Tính số hạt electron trong nguyên tử X.

A.8

B.9

C.11

D.10

( Mn ghi giải thích ra vs ạ )

Nguyên tử nguyên tố Y có tổng số hạt proton, nơtron, electron là 52. Trong hạt nhân nguyên tử X có số hạt không mang điện là 12. Xác định số proton .

A.17

B.18

C.20

D.16

XVII. Make questions for the underlined words.
1. She speaks English fluently.
____________________________________________________
2. Tien is in the room
____________________________________________________
3. The teacher was angry because he didn’t do his homework.
____________________________________________________
4. The Hani people live in Lai Chau and Lao Cai.
____________________________________________________

XVI. Complete each sentence so it means the same as the sentence above.
1. All of the children of the Khang’s really like playing rackets. (keen)
______________________________________________________________________.
2. The thing that I hate most is motor racing, and I will never do it in my life. (detest)
______________________________________________________________________.
3. Cats cannot swim as well as dogs.
Dogs can swim__________________________________________________________.
4. It took me two hours to walk to her village.
I spent _________________________________________________________________.
5. She likes to hang out with friends on Saturday evening.
She’s interested__________________________________________________________

.XVII. Make questions for the underlined words.
1. She speaks English fluently.
____________________________________________________
2. Tien is in the room
____________________________________________________
3. The teacher was angry because he didn’t do his homework.
____________________________________________________
4. The Hani people live in Lai Chau and Lao Cai.
____________________________________________________

VI. Điền mạo từ ‘a’, ‘an’ hoặc 0 vào chỗ trống sao cho thích hợp.
1. She asked me for _____ information about the meeting.
2. They will move to _____mansion next month.
3. Kien used to be_____famous teacher.
4. I spend _____hours on my DIY project.
5. We read ____ books and play _____games when we have free time.
6. Linh doesn’t want to borrow_____money from anyone.
7. My friend and I threw_____party last week.
8. It was _____honor to be invited here today.
9. I’ve bought _____umbrella for my sister.
10. My family often have____ eggs for breakfast.
11. Would you like______cup of tea?
12. My brother doesn’t like ______ cats.
13. Is there _____ post office here?
14. My father works as _____ electrician.
15. She has been playing ____ piano for ten years.