Group 20

Group Name : GROUP 20

Group Members :
YONG SOON MING, JESSLIN TAN JIE LING, GOH WEI HAU, LAU YING YING FELICIA, HE LIANLING, NG JUN WEI JONAS

1.

Since styrofoam is made with foaming agents, the solubilisation of styrofoam in acetone releases the gas inside styrofoam. This allows the styrofoam to collapse on itself and become more dense.

2.

a. Branched LDPE is too weak for such use.

b. Linear HDPE have monomers that line up in a way that allows it to have the required strength. By using a thin layer of HDPE, we can ensure that flexibility is also achieved.

3.

No it does not. When plastic is stretched, the molecules are allowed to align itself in parallel to each other and in the direction of the pull. This change in conformation is irreversible and if the stretching persists, the plastic will tear. In a piece of paper, such significant stretching does not occur due to the rigidity of the bonds holding the cellulose molecules together. This rigidity does not allow the molecules within cellulose to easily change conformation and align with each other.

4.

a. Non-reactive, non-toxic, cheap and easy to implant.

b. There are more than one type of polymer used to make contact lenses including polymethyl methacrylate (PMMA), Kolfocon, Polymacon etc. Desirable properties include non-toxicity, low-cost, permeability to oxygen and comfortable for wearing.

c. Hard contact lenses are usually made from PMMA which is rigid and non-gas permeable while soft contact lenses, usually made from Polymacon, are oxygen-permeable and flexible. These two properties of soft contact lenses make them more comfortable for wearing.

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[158]	Group Name : [112]
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[158]	Group Name : [112]
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[158]	Group Name : [112]
Group Members : [113]
1. [114]
2. [116]
3. [118]
4. [119]
5. [120]
6. [164]
7. [165]
8. [169]
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Group 20	Group Name : Group 20
Group Members : LAU YING YING FELICIA, JESSLIN TAN JIE LING, JONAS NG JUN WEI, YONG SOON MING, GOH WEIHAU
1. a. C6H12O6 = C6(H2O)6 b. c. Yes, expected. Glucose is one isomer of fructose, and there are many kinds of glucose as well. Hence the different kinds of isomers will give different properties hence, different sweetness levels as well.
2. All nutrients are made up of chemical structures, hence it is impossible that “all organic chemical-free” diet really exists. A simple example is water, water itself is a chemical compound with a chemical structure (there is no such thing as water with no chemical structure).
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[363]	Group Name : [340]
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Group 20	Group Name : GROUP 20
Group Members : YONG SOON MING, JESSLIN TAN JIE LING, GOH WEI HAU, LAU YING YING FELICIA, HE LIANLING, NG JUN WEI JONAS
1. Carbon atoms can exist as isotopes. They can differ from one another by having different number of neutrons (different mass number) and in electron numbers. Carbon atoms differ from all uranium atoms in their proton number, electron number and neutron numbers.
2. The representations of 14N or 15N tells us not only the type of atom it is but also the mass number of the atom. The mass number tells us the total amount of protons and neutrons present in the atom. Stating the mass number of the atom will allow us to calculate the amount of neutrons present in the atom.
3. a. 94 b. Neptunium has 93 protons and Plutonium has 94 protons c. 86 protons
4. A – Control rods B – Cooling water out of the core C – Control Rod Assembly D – Cooling water into the core E – Fuel Rods
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