Hoàn thành các dãy chuyển đổi hóa học sau :
1. Na→Na2O→Na2CO3→NaOH
2.Ca→CaO→Ca(OH)2→CaCO3→CaSO4
3.S→SO2 →SO3→H2SO4→K2SO4
↓
H2SO3
6.Cu↔CuO→CuCl2↔Cu(OH)2→CuO
7.FeCl3→Fe(OH)2→Fe2O3→Fe2(SO4)3→FeCl3
8.Fe2(SO4)3↔Fe(OH)3
9.Al→Al(NO3)3→Al2O3→Al→Ba(AlO2)2
10.Fe→Fe(NO3)3→Fe2O3→Fe→FeCl2→Fe(OH)2→Fe(OH)3→Fe2O3→FeCl3
1.I don't know many English words.
~ I wish............................................
2.My friend can not stay with me longer.
~I wish............................................
3.I don't have time to go around the city.
~I wish................................................
1.Thousands of people have to build that castle for him foryears.
~That castle..........................................
2.She has never read this book before.
~It is...................................................
3.He failed in the examination last year.
~He did not......................................
4.I haven't eaten this hind of food before.
~This isthe first...............................
5.His parents made him study for his exam.
~He was made.....................................
6.I don't really want to go to the museum.
~I'd rather................................................
7.The fire has destroyed many houses.
~Many houses......................................
8.May I borrow your pen?
~Would you mind.................................
9.I started work for the company a year ago.
~I've......................................................