rlau004

Group Name : Group 37

Group Members :
Agnes, Randy, Rinittha, Alexandrea, Rui Wen

1.

Desalination takes quite a lot of energy, so it is expensive. Moreover, the residue is very saline brine, which must be disposed of without causing too many environmental problems.

2.

Like dissolves like –> Molecules with many polar groups are more soluble in polar solvents and molecules with few ion polar groups are more soluble in non polar solvents. Water- soluble vitamins can form ion-dipole interactions with water hence it is soluble.

3.

(a) Hanging laundry means no need to use electric dryer, saving electricity and reducing the amount of fossil fuels needed to be burnt to produced that electricity, so less fumes and thus less acid rain

(b) Walk, bike or take public transport will reduce the number of vehicles used. Thus, reducing fuel emissions and pollutants. Therefore, reducing acid rain.

(c) Avoid running dishwashers and washing machines with small loads means reduce need to use dishwasher & washing machine, saving electricity and reducing the amount of fossil fuels needed to be burnt to produced that electricity, so less fumes and thus less acid rain

(d) Added insulation means reduce usage, saving electricity and reducing the amount of fossil fuels needed to be burnt to produced that electricity, so less fumes and thus less acid rain

(e) Buying locally grown produce and locally produced food will reduce the need of transportation of imports. Thus, reducing fuel emissions and pollutants. Therefore, reducing acid rain.

4.

a) Coal-fired plants produces dust, thus, producing H2SO4 which results in haze and decrease in visibility.

b) Normal rainfall= approximately 5.6
pH of rain fall in park = approximately 4.6

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Group 37	Group Name : Group 37
Group Members : NG SHI NING AGNES, RINITTHA D/O MATHIALAGAN, ALEXANDREA ANG SHIYING, IGNATIUS RANDY WONGSO, LAU RUI WEN
1. 1. There may be mutations that might be cloned due to identical DNA 2. They will not have a longer lifespan
2. Pros: 1. Grow in harsh weather conditions 2. Higher yield 3. Greater nutritional value as there is less pesticides usage Cons: 1. Harms the ecosystem balance 2. Triggers allergies
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Group 37	Group Name : Group 37
Group Members : NG SHI NING AGNES, RINITTHA D/O MATHIALAGAN, ALEXANDREA ANG SHIYING ,IGNATIUS RANDY WONGSO, LAU RUI WEN
1. (a) C6(H2O)6 (b) – (c) No, they do not have the same sweetness. Isomers do not necessarily share similar properties as they have different structures
2. We are eating chemicals, even if you eat organic food, water is chemical. Air is also made up of chemicals. In addition, organic food does not use pesticides or insecticides but it is also possible that they use chemicals to enhance the growth of the plant. Thus, there is no such thing as chemical free diet.
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Group 37	Group Name : Group 37
Group Members : NG SHI NING AGNES, RINITTHA D/O MATHIALAGAN, ALEXANDREA ANG SHIYING ,IGNATIUS RANDY WONGSO, LAU RUI WEN
1. (a) C6(H2O)6 (b) – (c) No, they do not have the same sweetness. Isomers do not necessarily share similar properties as they have different structures.
2. We are eating toxic chemicals, even if you eat organic food, water is chemical. Air is also made up of chemicals. There is no such thing as chemical free diet.
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Group 37	Group Name : Group 37
Group Members : NG SHI NING AGNES, RINITTHA D/O MATHIALAGAN, ALEXANDREA ANG SHIYING, IGNATIUS RANDY WONGSO, LAU RUI WEN
1. Acetone dissolves the polymer, dissolving the gas of the dissolving agent to escape. The polymer collapses on itself, and is more dense because the gas has been removed.
2. a) LDPE when branched is not strong enough for this application. b) Using linear LDPE allows for the HDPE molecules to line up in a manner that produces the required strength.
3. No. the plastic strip just narrows by aligning parallel to one another in the direction of pull (This is irreversible and will eventually break.) For paper, it tears rather than get stretched, because the cellulose molecules in paper are held much more rigidly in place, and are not free to align.
4. a) Stable, last for a long time, easy to implant, non- toxic b) HEMA ( hydroxyethyl methacrylate) for soft PMMA (polymethyl methacrylate) for hard Non toxic, comfortable to wear, inexpensive, conforms to eye-shape, easily cleaned. c) PMMA is hard and has no oxygen permeability and is rigid, but HEMA has oxygen permeability, and its flexible, making HEMA more comfortable.
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CM8001

Impact of Chemistry on Society

Author: rlau004

Group 37	Group Name : Group37
Group Members : NG SHI NING AGNES, RINITTHA D/O MATHIALAGAN, ALEXANDREA ANG SHIYING, IGNATIUS RANDY WONGSO, LAU RUI WEN
1. Isotopes of carbon. Different number of neutrons and number of electrons. All carbon atoms differ from all uranium atoms in their number of protons, neutrons and electrons and also in their chemical properties.
2. N is element Nitrogen. It stands for naturally occurring mixture of all isotopes. The symbols (14)N and (15)N represent very specific isotopes with mass numbers of 14 and 15 respectively.
3. a) 94 b)93- Np( Neptunium) 94- Pu (Plutonium) c)86 protons
4. A- control rod assembly B- cooling water out of the core C-control rods D- cooling water into the core E-fuel rods
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Group 37	Group Name : Team 37
Group Members : Agnes, Alexandrea, Rinittha, Randy, Rui Wen
1. a) Exothermic. Heat is released by the charcoal. b) Endothermic. Water absorbs heat from the surroundings, thus, evaporating. c) Endothermic. Ice absorbs heat from the surroundings, thus, melting
2. Reactants need to have a higher energy than products, in other words, the bond strength of the products need to be higher ( stronger) than that of the reactants.
3. Temperature is the measurement of heat, in other words, temperature is just a number showing the direction of heat flow, but heat is a form of energy. E.g. A thermometer tells you the temperature of an object, making it more tangible to understand . When melting an ice cube, heat is what causes it to melt and its temperature can be measured.
4. a) It contains 98% isoctane and 2% heptane. (The higher the rating, the lower the knocking) b)It cannot be determined due to lack of information
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