Group 21 | Group Name : Group 21 |
Group Members : Moh Heng Gee, Ng Zi En, Christopher Gan, Lim Wei Jie, Chew Jian Eng |
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1.
The 2 most common desalination techniques as distillations and reverse osmosis. Both of them require energy to remove salts from sea water or brackish water and thus inherently are expensive. if a less expensive option is available, such as hauling fresh water from a distance, then this option is used. |
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2.
Water is a polar solvent and prefer water-soluble compounds to dissolve such as vitamins, being able to form hydrogen bonding between the solvent and the solute. While on the other hand, fat-soluble compounds may not be need to be water-soluble or polar compounds. Fat-soluble compounds may be non-polar compounds that dissolve in fat-soluble or non-polar solvents. |
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3.
(a) To reduce usage of clothes dryers to save electricity. Less fuels burnt at power plants, hence less NO(x) and SO(x) emission, reducing acid rain. (b) Reducing usage of private cars can reduce automobile emission which contain NO(x) mainly, hence reducing acid rain. (c) Running with small loads are less efficient and waste electricity, hence this causes more fuel burnt, causing more acid rain formation. (d) This allow more efficient heat transfer and require less electricity to heat up the water, saving electricity and reducing emission. (e) To save on fuels needed to transport the produce overseas, reducing emissions in power plants. |
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4.
(a) Coal-fired plants produce anthrogenic microscopic particulate matter that produce haze that results in poor visibility in air. (b) Assuming the pH of natural rain is 5.6, then the pH of the rainfall in the park is 4.6 |
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5. [251] |
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6. [253] |
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7. [255] |
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8. [257] |
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9. [259] |
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10. [261] |