chia m gam hỗn hợp x gồm bột các kim loại:ba,fe, al làm 3 phần bằng nhau.Phần 1:Tác dụng với H2O dư thu được 0,896 lít khí (đktc). Phần 2 tác dung với dung dịch Ba(OH)2 dư thu được 1,568lít khí (đktc).Phần 3 tác dụng với dd H2SO4 10%, ( dư 5% so với lượng dung dịch axit còn dùng ban đầu) đến khi kết thúc p/ứng thu đc dd Y và thoát ra 2,016l H2(đktc)

a)viết PTHH

b)tính C% các chất tan trong dd Y

Phân biệt 5 khí đựng trg 5 bình riêng biệt: CO2, SO2, C2H4, C2H2, CH4. Trình bày phương pháp phân biệt và viết pt

Question 4. Choose the most suitable word given in the box to complete the passage.

      The most effective way of learning a language is by living in the country concerned, but parents should think (1) _____________ before they send their children abroad. Although some (2) ____________ arrange visits for children as young as ten, the (3) ____________ of them won’t be ready to stay away from home and deal with (4) ____________ differences until they are in their teens. Even they will need a basic (5) ___________ of the language and some experience of foreign travel before they go.

      Exchange visits are a good way for (6) ______________ to improve their language skills. It is a good idea for them to exchange (7) _________ before the visits. Host families should not feel any (8) ______________ to provide an extensive program of (9) _____________ . It is more important to make the guest feel welcome. Travel can (10) ____________ the mind, and exchange visits give young people experience of a different way of life as well as a different language.

Question 4. Choose the most suitable word given in the box to complete the passage.

      The most effective way of learning a language is by living in the country concerned, but parents should think (1) _____________ before they send their children abroad. Although some (2) ____________ arrange visits for children as young as ten, the (3) ____________ of them won’t be ready to stay away from home and deal with (4) ____________ differences until they are in their teens. Even they will need a basic (5) ___________ of the language and some experience of foreign travel before they go.

      Exchange visits are a good way for (6) ______________ to improve their language skills. It is a good idea for them to exchange (7) _________ before the visits. Host families should not feel any (8) ______________ to provide an extensive program of (9) _____________ . It is more important to make the guest feel welcome. Travel can (10) ____________ the mind, and exchange visits give young people experience of a different way of life as well as a different language.

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