Cặp chất tác dụng với nhau tạo thành sản phẩm có chất khí:
PTHH: BaCO3 + H2SO4 → BaSO4↓ + H2O + CO2↑
Dãy gồm các kim loại tác dụng được với dung dịch H2SO4 loãng là:
Nhóm chất tác dụng với nước và với dung dịch HCl là:
Dãy các chất không tác dụng được với dung dịch H2SO4 loãng là:
Nhóm chất tác dụng với dung dịch H2SO4 loãng sinh ra chất kết tủa màu trắng:
Để phân biệt 2 dung dịch HCl và H2SO4 loãng. Ta dùng kim loại
Thuốc thử dùng để nhận biết dung dịch HCl và dung dịch H2SO4 là:
IV. PREPOSITIONS AND PARTICLES
1. It was very nice _________________ you to prepare and serve meals for the homeless.
2. He was very nice _________________ me. He was willing to take care ___________ my house while I was away.
3. “I’ve bought the Christmas tree you wanted.” – “Oh, thanks – that’s really kind ________ you .
4. Should you be kind _____________ him? He will forget your kindness __________ him.
5. Please be considerate _______________ your next-door neighbors. Never turn the TV up after midnight.
6. It was very considerate _______________ him to send her mother a bouquet of flowers ____________ Mother’s Day.
7. Many people decorate their homes ____________ Christmas. They buy Christmas trees and decorate them _________________ electric lights and ornaments.
8. Children believe that a fat, jolly man brings gifts____________ Christmas Eve. ________ Christmas morning, they look under the Christmas tree or in their stockings ______________ gifts ________________ him.
9. _____________________ Christmas Day, Christians go to church and sing joyful songs.
10. The shops are always crowded ___________________ Christmastime.
11. Would you like to go to Paris with us ____________________ Christmas today?
12. By tradition, people send greetings cards to their relatives and friends ____________ Tet. 13. Tet Trung Thu or the Mid-Autumn Festival is celebrated every year _________________ August 15th.
14. Passover is celebrated _________________ late March or early April.
15. Vietnamese people always have big celebrations ____________________ New Year.
16. Bye. Don’t forget our plans. Let’s see each other ___________________ the New Year.
17. _________________ Easter Sunday, young children receive some small chocolate eggs.
18. Easter egg hunts are popular _____________________ Easter.
19. Bob’s father is different ____________________ Jack’s in character and height.
20. They look much alike. We can’t distinguish one twin __________________ the other.
21. Rita was proud _________________ her success in her youth.
22. Here you are ________ last! I’ve been so worried! Thank goodness you’ve arrived safely. 23. Let me congratulate you _____________________ your excellent exam results.
24. Most girls are afraid ___________________ going out alone _______________ night.
25. We sometimes go to the theatre or the opera _________________ a friend ____________ Sunday nights.
26. It rained heavily _________________________ the night.
27. _______________________ the first night of my stay in Paris, I couldn’t get to sleep.
28. Were you satisfied ______________________ your last Christmas?
29. He was late _____________________ the show due _________________ the traffic jam. 30. This generous present was given _________________ me ________________ my parents ____________________ my 18th birthday.
31. The Youth Cultural House _____________________ Pham Ngoc Thach Street is open ___________________ public holidays.
32. What lessons can you draw _____________________ that serious mistake?
33. I am permitted to stay up late ___________________ late-night horror movies.
34. Do you often fly to Asian countries _____________ business or ____________ pleasure? 35. I have to help mum _____________ her household chores while she is __________ work. 36. Sorry, I have no time to talk to you ____________ the moment – I’m __________a hurry. 37. Thanks ____________ the present! I have always dreamt _____________ a pet goldfish!
38. We will go ________________ a trip ___________________ the museum next week.
39. I wish I could afford to go ______________ a tour ________________ Southern Vietnam.
40. Volunteers are ready to help people ______________ need _______________ being paid.
MN GIÚP TỚ VỚI Ạ