Câu 2: Hoàn thành các ptpu sau: (nếu có)
a. MgO + H2O → f. CuO + HNO3 →
b. CaO + H2O → g. ZnO + HCl →
c. Al2O3 + H2SO4 → h. K2O + CO2 →
d. BaO + H2O → i. Na2O + P2O5 →

Ở 200C, cho độ tan của đường là 200 gam. Cho 500 gam dung dịch bão hòa đường ở 200C. Tính số gam
đường và gam nước trong 500 gam dung dịch ở 200C ?
 

Ở 600C, cho 250 gam dung dịch bão hòa Na2SO4 20%. Tính độ tan của Na2SO4 ở 600C ?
 

Biết ở 250C, 300 gam nước hòa tan được 108 gam NaCl để tạo thành dung dịch bão hòa. Tính độ tan
của NaCl ? Tính nồng độ phần trăm của dung dịch bão hòa thu được?
 

Hãy cho biết loại hợp chất, tên gọi của:
KOH, Na2CO3, SO2, MgO, AlCl3, Zn(OH)2, PbSO4, H2SO3, Fe2(SO4)3, Fe(OH)2, Na2O,
BaCl2, Ca(HCO3)2, CuS, BaSO3, H3PO4, Ca3(PO4)2, AgNO3, Cu(OH)2, MgSO4, AgCl;
CO2; FeO, Zn(NO3)2, Fe(OH)3; FeS, HCl; NaHCO3, BaSO4, H2SO4, Cu(OH)2; CaO, P2O5,
Ag2O, Pb(NO3)2

VD: KOH: bazo tan, kali hidroxit.
 

31. Despite the sunny weather, she didn’t go out.

=> Although………………………………………………………………..

32. Though the airfare was expensive, we went on holiday to Thailand.

=> Despite………………………………………………………………..

33. Even though it was snowing, we enjoyed the walk.

=> In spite of..........................................................................................

34. Although the bag was heavy, she managed to carry it herself.

=> Despite………………………………………………………………..

35. Because Clara was ill, her mother didn’t let her go sight-seeing.

=>Due to………………………………………………………………..

36. Though his mother refused to let him go to the party, he went anyway.

=> Despite………………………………………………………………..

37. Because he worked very hard, he earned a lot of money.

=> Because of………………………………………………………………..

38. Although she is attractive, people don’t like her personalities.

=> Despite………………………………………………………………..

39. Because my friend was sad, I took her to the shopping mall.

=>………………………………………………………………..

40. Although there wasn’t good music at the party, I was fine with it.

=> Despite………………………………………………………………..

25. Because I locked all the doors before going out, I am not afraid of thieves.

=>Because of………………………………………………………………..

26. Although she eats a lot, she doesn’t put on weight.

=> In spite of………………………………………………………………..

27. Although she in a fancy house, she didn’t feel happy.

=> Despite………………………………………………………………..

28. Although he succeeded in his career, he couldn’t find his true love.

=> In spite of………………………………………………………………..

29. Someone might break into his office.

=>………………………………………………………………..

30. He didn’t invite me to his birthday party.

=>………………………………………………………………..

tìm x biết:

a, 4x² 4x + 1 = 0

b, (x - 1) (x² + x + 1) - x (x² + 1) = 4

c, (2x - 1)³ + (x+2)³ - 9 (x + 1) (x - 1) x = 7