Air and Environment

3. ___ is added to soil to neutralise excess acidity (2 words)
4. sulfur dioxide causes eye irritation and ____ difficulties
5. ___ hydrocarbons escape when petrol or diesel vaporise without undergoing combustion in car engines
6. toxic gas that interferes with oxygen absorption in the body and leads to death (2 words)
9. _____ reacts with oxygen at high temperatures in internal combustion engines to form oxides of _____
10. carbon monoxide binds tightly to ____ to form a stable compound, carboxy______ which prevents oxygen from being transported
11. acid rain ____ buildings made of cement (contains carbonates), limestone and metal structures
15. this can result when oxides of nitrogen and sulfur dioxide enter the atmosphere (2 words)
17. carbon monoxide is dangerous because it is colourless and ____, hence no warning of its presence
18. to decrease the formation of nitrogen monoxide and nitrogen dioxide, engines can be designed to run at ____ temperatures

1. gas most responsible for the greenhouse effect (2 words)
2. a compound containing only carbon and hydrogen as elements
7. a natural source of sulfur dioxide
8. a natural source of oxides of nitrogen (2 words)
12. the gas that makes up 21% of the composition of air
13. production of sulfur dioxide gas can be reduced by lowering the amount of ____ in fossil fuels such as coal
14. acid rain lowers the pH of soil and rivers making them too ____ for plants and fish
16. carbon monoxide is formed from the ____ combustion of petrol in motor vehicles