500ml_h2so4=0.5l ; n_h2=33,6/22,4=1,5 mol

ptpu: 2Fe+3H₂SO_{4 --->}Fe₂₍SO₄₎₃ +3H₂

            2mol  3mol        1 mol              3mol

         1mol   1mol                               1.5 mol

b/ mfe =1.56=56g

c/ cm=n/v =>n=cm.v=1.98=98

1 . some people have accidents because they haven't slept well .

->        why do some people have accidents?                                                                                         

2. where you ought to put the rug between the armchair and the couch .

->       where you ought to the rug?                                                                                          

3. Ba drew the pictures himself 

->          who drew the picture?

đặt câu hỏi à

1. What is the correct pronounciation  of this word.       ( pronounce ) 

2. My grand father can read well 

( good ) 

3. Last week we had an ẹnjoyable summer holiday.  ( enjoy )

4. The..importance  of the project made me tense.      ( important ) 

5. You had better do some.revisions  for the final exams      ( revise ) 

1.We(take ) ..am going to take.... some photos tomorrow evening.

2. I(visit) ....am going to visit.... my aunt tomorrow.

Đặt câu hỏi cho phần gạch chân

1. I'm going to see a movie tonight

=>what are you going to tonight?

2. They travel to Nha Trang by train.

=>how do they travel to nha trang?

3. We shouldn't walk because it is too far.

=>why shouln't we walk?

4. My sister's eyes are blue

=>what color are your sister's eyes?

1. I wish I can=>could go wish you , but I have to baby-sit.

2.Last night I don’t=>didn'twatch television.

3. I can’t play the piano , but I wish I can.=>could

4.He made his  first film when he is=>was 12 years old

5. I wish it isn’t=>weren't/wasn't so cold outside today. I want to go swimming

6.When did you buy your car?  The last week .

7.Do you wish you=>bỏ are there right now?

8. I wish you will =>wouldstop smoking . I am worried about you.

9. My friend and I am=>are always busy on Sundays

10. I wish I have=>had more free time.

every one became quite when the concert began

the violence was the result of political and ethnic conflicts

iii/

ii/