Application Exercise 5

  1. The first method is boiling. Boiling the water will kill off the microorganisms, bacteria and pathogens. In terms of cost, this process is a rather inexpensive. However, boiling requires time and does not remove chemical contamination. It requires fuel and may release soot and carbon dioxide into the atmosphere. The second method is the usage of iodine to purify the water. It is inexpensive and easy to administer. However, it should not be used for the long term, and pregnant ladies and people with thyroid should avoid such purification.
  2. This is because it requires a large amount of energy, high cost and causes negative environmental impacts such as releasing concentrated waste stream on the ecosystem.
  3. a) Corrosion of lead pipes or solder in drinking fountains or water storage tanks.b) No. During the chemical research, there may be common use of acids or other minerals that corrodes the lead pipes or solder, bring the dissolved lead into the water.
  4. Water-soluble vitamins are considered to be be polar compounds as they have mostly polar groups than non-polar groups. On the other hand, fat-soluble vitamins are considered to be non-polar as it can dissolve in fat or lipid, which are non-polar molecules having predominantly non-polar hydrocarbon.

Author: Thomas Chen

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