cho 19.3g hỗn hợp 2 kim loại Zn và Cu vào 200ml dung dịch H2So4 loãng dư thu được 2,24 lít khí (đktc)
a)tính thành % theo khối lượng từng kim loại trong hỗn hợp ban đầu
b)tính nồng độ mol axit đã dùng 
c)tính nồng độ mol của muối sau phản ứng (cho rằng thể tích thay đổi ko đáng kể)

I. Circle the words which have stress in different position   from others.

1   behave dogsled  treatment               2  illiterate   igloo   facility event 

3   artic       surprise vendor       outdoors   marriage              4 funeral    relative     special   respect 

5. diary       dairy        habit          preserve         6 arrangement  appreciation   agreement  attendant  

1. There used (be) _____________________ a lake here.

2. Have you been used to (live) _____________________ alone? – Yes I have.

3. In the past, children often (play) _____________________outdoor games instate of indoor ones.

4. When we (arrive) _____________________  home,  my children (go) _____________________  to the cinema. Nobody was at home.

5. The students decided they didn’t take part in the competition because it (cost) _____________________ much money.

6 Why did you take his comb ? He (look) ____________________for it everywhere tomorrow.

7 I hope you (cook) ____________________well in the rice – cooking festival.  

8 Sorry! We (just sell out) ____________________all the tickets — No problem. I (wait) ____________________ for tomorrow’s show.

V . Complete the sentences with a suitable preposition in each blank.

1. Some novels can take people ______________   ________________ the past.  

2. In the past, children used to play _________________ the things the found.

3. I love going bare – footed on the beach and feeling the sand _____________ my feet.

4. The farmers in Arctic area transport  their ice home   ___________________ truck.

5. I wish everybody in the world live __________________ peace.

6. We wish we could communicate ____________________ animals.  

7. Before blacksmiths used to pull ____________________ teeth.

8. Nga can paint  _________________ ceramic pots.   

1 ___________________, nobody in this family wants to take care for his parents.  (incredible) 

2 Many people in Artic live in __________________ houses built from blocks of ice as the weather there is too cold. (dome)

3. It is __________________ David can stand being laughed at so much by his friends. (believe) 

4. Traditional games are less   __________________  than  modern games. (compete)

5. His __________________ is beyond our __________________. (achieve/ expect)

6 In the past, the __________________ was really terrible. Not many people knew how to read or write. (illiterate)

7. Many prisoners were __________________ tortured (tra tấn) in this room. (fatal)

8. Ha is lazy. She rarely finishes her  __________________. (assign)