Group 32

Group Name : Group 32

Group Members :
Clinton, Ridley, Amalina, Chieng Yi, Clara

1.

When styrofoam gets dissolved by the acetone, the gas from the foaming agent used to make styrofoam is released. The styrofoam then condenses into a smaller and denser solid

2.

a) Branch LDPE has reduced mechanical strength, so it cannot withstand the required strength
b) the molecules of HDPE must be arranged in a manner that gives it higher strength. Linear arrangement has a larger surface, and so has a larger induced intermolecular force

3.

No it does not happen to the piece of paper. When the piece of plastic is stretched, the molecules will be arranged to become parallel to the direction of the pull. This would be an irreversible change and the plastic will snap. Paper is made of cellulose in which the molecules are more rigidly held in place because of stronger intermolecular forces

4.

a) ease of implantation, non-toxic, stable in body, high corrosive resistance
b) Polymethylmethacrylate (PMMA), silicon acrylate
Desirable properties: non-toxic, transparent, permeability to oxygen, comfortable, high durability
c) “hard”contact lenses are made of PMMA and “soft”contact lenses are made of silicon acrylate. Silicon acrylate is more flexible and is more fitting to the eye. “Hard”lenses are not as comfortable to wear as “soft”lenses and they may fall out more frequently. “soft” lenses easily absorb soap and lotion from our hands, causing eye irritation.

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[158]	Group Name : [112]
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[158]	Group Name : [112]
Group Members : [113]
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5. [120]
6. [164]
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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]
9. [170]
10. [171]

[158]	Group Name : [112]
Group Members : [113]
1. [114]
2. [116]
3. [118]
4. [119]
5. [120]
6. [164]
7. [165]
8. [169]
9. [170]
10. [171]

[158]	Group Name : [112]
Group Members : [113]
1. [114]
2. [116]
3. [118]
4. [119]
5. [120]
6. [164]
7. [165]
8. [169]
9. [170]
10. [171]

Group 32	Group Name : Group 32
Group Members : Clinton, Ridley, Clara, Chieng Yi, Amalina
1. a. 6CO2 + 6H2O + energy –> C6H12O2 + 6O2 ; CnH2nOn = Cn(H2O)n c. Yes. This is because even though fructose is the isomer of glucose but still fructose is sweeter than glucose.
2. All food contain at least a trace amount of chemicals. There may be some amount of pesticides present in the soil. Therefore, “all organic, chemical-free” diet is impossible.
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[363]	Group Name : [340]
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Group 32	Group Name : Group 32
Group Members : Ridley, Clinton, Clara, Chieng Yi, Amalina
1. 1 carbon atom can differ from another by their number of neutrons and their number of electrons. All carbon atoms differ from all uranium atoms by the total number of protons, neutrons and electrons, chemical properties and electronegativity.
2. The representations 14N or 15N show that there are isotopes which the symbol N does not show. 14N and 15N show that they have different numbers, 14 and 15 respectively.
3. a. 94 protons b. Np (neptunium) and Pn (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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