Câu1: Trong hợp chất XO3 nguyên tố X có hóa trị bằng :
A. I B. II C. IV D. VI
Câu2: Trong các chất HCl , O2 , CO. Ca, Zn số đơn chất là :
A. 1 B. 2 C. 3 D. 4
Câu3: chất có phân tử khối bằng 100 đvc là :
A. H2SO4 , B. NaNO3 C. Al2O3 D. CaCO3
Câu 4: Chất có phân tử khối bàng 102đvc là :
A. MgO B. AlCl3 C. Al2O3
Câu 5: Trong 6,4g Cu có chứa số nguyên tử là:
A 6.1023 nguyên tử B 6. 1022 nguyên tử C. 3.1023 nguyên tử D.6.1021 nguyên tử
Câu 6: 3.1023 phân tử H2O có số mol là :
A. 0,5mol B. 2mol C. 5mol D 0,05mol
Câu 7: Ở điều kiện tiêu chuẩn 6,72 lít khí CO2 có số mol là:
A. 0,1mol B. 0,2mol C. 0,3mol D. 0,4mol
Câu 8: 0,2mol chất sau có khối lượng bằng 8g là:
A. KOH B. Mg(OH)2 C. HCl D. NaOH
Câu 9: Hợp chất A có khối lượng mol phân tử là 106g , thành phần các nguyên tố :
43,4% Na ; 11,3%C ; 45,3%O Chất A có CTHH là:
A. NaCO B. NaCO3 C . Na2CO D Na2CO3
Câu 10: Đốt cháy 3,2g Lưu huỳnh trong oxi sau phản ứng thu được 5,6g Lưu huỳnh tri oxit (tạo bởi S hóa trị VI vàO hóa trị II) Khối lượng o xi tham gia là :
A. 2,4g B . 8,8g C. 24g D. không tính được
Put in a/ an/ the where necessary.
1. Don’t forget to turn off light when you go out. ➜ turn off the light
2. Enjoy your holiday and don’t forget to send me postcard.
3. What is name of this village?
4. Canada is very big country.
5. What is largest city in Canada?
6. I like this room but I don’t like colour of carpet.
7. “ Are you OK?” ~ “ No, I’ve got headache.”
8. We live in old house near station.
9. What is name of director of film we saw last night?
Read the first sentence, and then complete the second sentence with the same meaning.
1. Minh last wrote to his pen pal five months ago.
Minh hasn’t __________________________
2. They usually wore jeans when they were young.
They used ______________________________
3. The last time we visited Kuala Lumpur was two years ago.
It’s __________________________________
4. They are married. They got married six months ago.
They’ve _______________________________________.
Give the correct form of the verb in brackets.
1. What you (do)__________________________________ last weekend?
~ I (go)___________________________ to the theatre with my family.
2. John and I (be)_________________________ pen pals for nearly three years.
3. We used (write)________________________ to each other every month when we (be)____________________________ at secondary school.
4. Mary (stay) ____________________________ with us at the moment. She (be)_____________________________ my sister’s friend.
5. Her brother (talk)_____________________ to his pen pal on the phone at the moment. They (not/ contact)_____________________________ to each other for a long time.
6. It’s a nice day. I think I (sit)_______________________ in the garden.
7. I know you (not/listen) ______________________________ because you (look)_________________________________ out of the window.
8. I think Diana (pass)_______________ the exam.
9. “Why are you putting on your coat?” ~ “I (go out)______________________.”
10. I (not/ see) ___________________________ your brother recently.
~ No. He (not/ be)________________________________ out of his room since he (buy) _________________________________ a new computer.