Use the correct form of the words in brackets to finish the sentences
1. The..................of ecosystem of lakes, rivers, seas and forests must be prevented ( destroy )
2...................of hotels, recreation and other facilities often leads to increasing sewage pollution ( construct)
3. Waste water has polluted seas and lakes surrounding tourist...................damaging the flora and fauna ( attract)
4. The Earth's natural resources should be consumed at a............... level (sustain)
5.Over- exploitation of oil will ;ead to the..............of this natural resource (deplete)
6.Because of................, there may be no place for wild animals in the near future ( deforest)
7. When people understand clearly the.............. impacts, they will be more aware of conserving forests ( environment)
8. In the 1990's, public............of preserving the environment began to develop (aware)
9. A great.................... would be to start planting small gardens on the roofs of the buildings in the cities (solve)
10. Because non- renewable resources are being consumed at the rapid rate, human beings are likely to face fossil fuel............ ( deplete ).
Hòa tan hoàn toàn 13,6 (g) hỗn hợp Fe và CuO vào dung dịch H2SO4 đặc nóng dư thu được 2,24 lít khí SO2 ở đktc
a) Tính % khối lượng từng chất trong hỗn hợp ban đầu
b) Tính số mol H2SO4 loãng phản ứng