a. 6 CO2 + 6 H20 -> C6H12O6 + 6 O2 , OR CnH2nOn => Cn + (H2O)n
This shows that carbohydrate can be formed from the addition of carbon and water together through the chemical process commonly known as photosynthesis.

b. Refer to https://www.google.com.sg/search?q=fructose&safe=off&tbm=isch&imgil=dkIuEdaMVrjZZM%253A%253BBRptNdCiDeK0bM%253Bhttp%25253A%25252F%25252Fwww.rpi.edu%25252Fdept%25252Fchem-eng%25252FBiotech-Environ%25252FIMMOB%25252Fpoppezz%25252Fhfcs.html&source=iu&pf=m&fir=dkIuEdaMVrjZZM%253A%252CBRptNdCiDeK0bM%252C_&usg=__p_MEAI4k2x54kvxdk_GYCxWHMqA%3D&biw=1366&bih=633&ved=0ahUKEwjGvNqg5OfLAhVGGY4KHU2SDxoQyjcIgQE&ei=QHL7VsacFsayuATNpL7QAQ#imgrc=skMSCRuRg5E5SM%3A

c. No. Different isomers of fructose though having the same chemical formula would taste sweet, but with different chemical structure, this would affect different sweetness level.

It is impossible. Everything is made of chemicals. That’s when we play with words.

While it is possible to fulfill the all organic portion, when we start to consider chemicals, organic foods are all still filled with naturally-occuring chemicals.

Logically speaking, to eat synthetically created chemicals or food does not sound very pleasant or nutritious. Many are already skeptical of GMO, and we do not know how pervasive GMO has been in the agricultural and food industry, hence even the organic foods that we know could already be inorganic.

Acetone dissolve the polymer, allowing the gas of foaming agent to escape. The polymer collapses on itself and is more dense because the gas has been removed.

a. It does not have enough strength to withstand.

b. Because lining up the molecule in a way will while being a thin film allow it to be flexible.

No. The structure of cellulose is rigid, the layer can not slide over each other. When a large force is applied, the bond between the layer can be overcome completely, which leads to the total breakage of bonds between the layers.

a. Light weight, stable to be used over a long time, non-toxic, non-soluble in body fluid, cheap

b. Polymethyl methcrylate (PMMA). Soft, transparent, insoluble in body fluid.

c. Hard contact lenses (PMMA), soft contact lenses (Silicone). Soft contact lenses are flexible are allow oxygen to pass through

Carbon atoms can have different number of neutrons and electrons. They differ in terms of their number of protons, neutrons and electrons. They also have different chemical properties.

14N and 15N refers to Nitrogen. They are both isotopes of each other with mass number of 14 and 15 respectively.

a. 94
b. Neptunium, plutonium
c: 86

A: Control Rod assembly
B: Cooling water out of the core
C: Control Rod
D: Cooling water into the core
E: Fuel rod

Distillation and reverse osmosis are common desalination techniques. However, they are not widely used due to the high cost to remove salt.

Vitamins that are water-soluble because ‘like dissolves like’, and is hence considered polar. This is because they contain hydrophilic heads that allows them to dissolve in water molecules. Fat-soluble vitamins, on the other hand, cannot be dissolved in water, so it should not be polar compounds. This is because they generally contain hydrophobic exterior that is dissolvable in lipids. E.g. of fat-soluble vitamin is vitamin A.

3a. Hanging laundry will reduce consumption of electrical energy, which is produced from the burning of coal, which produces SOx.

3b. Less transport used, less NOx produced

3c. Reduce consumption of electrical energy, which is produced from the burning of coal. Hence SOx production is reduced.

3d. Prevent heat loss from hot water, reducing the amount of electricity required to heat up water, reducing SOx produced.

3e. Less preservatives used, hence less SOx and NOx produced. Lesser transportation is also required, reducing NOx produced.

a. Coal fired plants are responsible for producing sulfur dioxide and releasing a lot of other particulate matter into the air E.g. Soot. These byproducts of burning coal for fuel/energy thus leads to the poor visibility as they are not colourless.

b. Assuming pH of normal rainfall to be 6.7, more acidic by 10 times, hence pH of rainfall in Park is 5.7

a. Exothermic. Heat is given out when coal briquette is burnt and used by people for heating up stuff, cooking food, used to power trains (heat to kinetic energy by heating moving wind that drives some turbine..) and also to keep people warm during cold weather.
b. Endothermic with respect to water molecules. It absorbs heat energy from our skin, hence we feel a cooling sensation
c. Endothermic. Solid to liquid transition involves absorbing energy to achieve a higher energy state of product (liquid state water).

For a good explosion, energy needs to be given out for it to be exothermic. Thus product’s energy needs to be lower than that of the reactants. Enthalpy change is determined by the equation delta H = bonds broken (energy taken in) – bonds formation (energy given out). Thus the magnitude of bond formation is bigger than the magnitude of bond breaking. Hence we can conclude that the product bond strength is bigger than that of the reactant bond strength.

Coffee – as the coffee is chilled, heat is lost, hence temperature also drops.
Heat – total energy of molecular motion, a process.
Temperature – measure of average heat/thermal energy of the molecules in a substance, known magnitude.
Another analogy would be temperature being the current score on the scoreboard of a soccer game, the heat being the goals scored. Temperature is like a measurement of heat just like how the scoreboard measures the amount of goals.
My friends are quite smart and all know Chemistry.

a. It is slightly higher than octane – 98% of isooctane and 2% of heptane. Hence slightly abit more prone to knocking.
b. It does not tell us anything about the availability of oxygenates. It may or may not contain. Even the word premium does not do anything to save it. The only is through determination of molecular compound composition through fractional distillation.