1.Cho 30 g hỗn hợp Fe2O3 vào CuO hòa tan hết trong 600 ml đ HCl 3.5M . Sau phản ứng trung hòa lượng axit còn dư bằng 500ml dd NaOH 2.1M. Tính khối lượng mỗi oxit trong hỗn hợp đầu biết HCl tác dụng với NaOH tạo muối và nước
2.Một hỗn hợp gồm SiO2 và Al2O3.khi cho hỗn hợp tác dụng với 2L dd H2SO4 1M còn lại chất rắn A và thu được dd B biết rằngdể trung hòa hầu hết dd B cần 1L dd NaOH 1M.Mặt khác nếu hòa tan hết hỗn hợp cần 100 ml dd NaOH 15M.Tính klg mỗi oxit
i don't know linda's phone number.(and i regret it)
i don't have computer(and i need one)
it's cold (and i hate cold weather)
i live in a big city.(and i don't like it)
mary isn't here(and i need to see her)
i can't go to the party(and i'd like to)
`there are many people here (and it's very crowded)
i have to work tomorrow (but i'd like to stay at home)
i'm not lying on beautiful sunny beach(and that pity)
i don't have anything to eat(i'm very hungry)
6.hellen is so bossy.She acts as if she (own) the place
7.i wish you (not keep) coming late to class
8.i'd rather you(sit) next to Susan place
9.you are lucky going to Italy.I wish I (go) with you
10.i've no idea where we are ! If only we (take) a map
11.Visting museums is interesting I suppose,but i'd sooner we(go)swimming
12.this train journey seems endless. I wish we (go)by car
13.i wish i (have)the money to buy some new clothes,but i can't afford it at the moment
14.i wish the government(do)something about the pollution in the city
Put the verb into correct form
1.it s pity i can t speak E fluently.I wish i(speak) fluently
2.my grandmother gets used to(cross)the busy streets
3.i would say it's time you (start) working seriously
4.i'd rather you (not watch) TV while i'm reading
5.i wish i(spend)more time swimming last summer
He still (have)...a pain in hí leg now ,but it (get) ... better
I understand you (have)...an unpleasant experience at the weekend.What (happen)...?
I'm sorry about the nosie last night.We (have)...a party
You look tired.You(work)...too hard
When I arrived home,she was busy (get)...lunch
I'm hungry because I(not have)...breakfast or lunch
No one expected that he (be)...so successful
Is there anything here worth(buy)...
Bài1:cho 6 Oxit riêng biệt :Fe2O3;CuO;Na2O;P2O5;Al2O3;MgO.Nêu cách nhận biết mỗi oxít trên.
Bài 2: Cho hỗn hợp Fe2O3;SiO2;Al2O3.Làm thế nào để thu được :a)Sio2 b)Fe2O3
Bài 3: Hòa tan 2,4 g một Oxit bazơ cần 10g dd HCl 21,9% . Tìm CT Oxit