Câu 1: a) trong phân tử kẽm oxit ZnO, cứ 16 phần khối lượng của oxi thì có 65,38 phần khối lượng kẽm. Tìm nguyên tử khối của kẽm.

b) Tìm khối lượng mol phân tử của một chất khí, biết rằng 400 cm3 chất khí đó có khối lượng 1,143g.

c) 1 g vôi sống CaO hay 1 g vôi tôi Ca(OH)2 chứa nhiều phân tử hơn?
22:52
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IV. Read the passage and fill in the each blank with ONE suitable word

EFFECTS OF AIR POLLUTION

There are different kinds of negative and harmful effects of air pollution. Air pollution (1)………………. global warming in a great scale. The global warming (2)………….. to the increase of temperatures worldwide, the increase in sea levels and the melting of icebergs. It (3)……………… all species on the earth. The effects of air pollution are very (4)………………. for health. It causes different kinds of diseases like heart attack, cancer, etc. Every year millions of people of all over the world die due to direct or (5)………………. effects of air pollution. Acid rain is another effect of air pollution. Acid rain can cause great damage to human, animals and crops. Air pollution (6)…………….. the wild life. Humans and animals face a lot of serious effects due to air pollution. Toxic chemicals present in the air can force wildlife species to (7)……………. to new place and change their habitat. The toxic pollutants over the surface of the water can also affect sea animals. It is right time to (8)………………. our environment. To create a better place to live, we have to stop the air pollution. 

II. Find the mistake in each sentence
1. The fish are dead because the polluted watter.
     A            B               C                  D
2. Ships spill oil in oceans and rivers led to the die of many aquatic animals.
     A                                B                          C                     D
3. Land pollution  happens when human activities destroy Earth’s surface.
          A                     B                                   C                      D
4. She has found that nobody can help her if she did not try her best to do it herself.
                  A                                  B                              C                        D
5. Unless there had been the heavy storm, the climbers will not have died.
       A                    B                 C                                      D

II. Put the verbs in brackets into the correct form:

1.   If you ______________ (arrive) ten minutes earlier, you would have got a seat.

2.    If he worked more slowly, he ______________________ (not make) so many mistakes.

3.    I shouldn’t drink that wine if I _________ (be) you.

4.    If I ___________ (find) a cheap room, I will stay a fortnight.

5.    A lot of people ______________ (be) out of work if the factory closed down.

I. Choose the word whose underlined part pronounced differently from the others