a) 6C + 6H2O -> C6H12O6
c) No. It is due to the different solubility in water. Hence, the more soluble it is, the sweeter it is. Fructose is sweeter than glucose.

Everything we eat is made up of chemicals: food we eat, water we drink. All matter is made of chemicals. We are “biochemical machines” and everything inside us is driven by chemical reactions inside of our body. Therefore, it is impossible to go on such a diet.

Acetone dissolves the polymer, allowing the gas of the foaming agent to escape. Therefore, the polymer will collapse as a result of the gas escaping, which will then cause solid Styrofoam to be more dense.

a) LDPE cannot be used in this application as it does not have the required resistance to breakage.

B) The molecules of HDPE must line up in a way that produces the required resistance to breakage. This can be achieve by using a thin layer of HDPE which will then allow it to achieve sufficient flexibility.

When the piece of plastic is stretched, the strip narrows and “necks down”, the molecules will then become aligned parallel to one another, in the direction that it is being pulled. However, this is an irreversible action as the three-dimensional structure is being altered. In addition, if the plastic is continued being pulled, it’ll eventually break.

On the other hand, if the same pulling force is applied to a piece of paper, the paper will break instead of being stretch as the cellulose molecule present in the paper are held more rigidly in place and thus not free to be aligned.

a) The benefits desired are polymers should be stable over time of intended usage, it must be non toxic to the body, it also should have a low-cost factor and lastly, it must be of low solubility and reactivity in the human body.

b) Hard contact lenses are made from Polymethyl methacrylate (PMMA), which are used for rigid gas permeable lenses, and soft contact lenses are made of hydrogel and silicone hydrogen which are water absorbing polymers. In soft lenses, properties such as comfortable usage, flexible and definitely needs to allow oxygen to reach the eye. On the other hand, hard lenses definitely have to be non toxic to the eye and it also must have to allow high level of oxygen of breathability.

c) The difference between hard and soft lensesto is due to the material used, an example hard lenses material would be Polymethyl methacrylate (PMMA) and soft lenses would be silicon hydrogel (water absorbing polymer). Soft contact lenses tends to be more flexible and it also allows sufficient oxygen to reach the eye, which indirectly allows wearing of soft contact lenses to be more comfortable.

Carbon: Isotopes of one another, ions of electrons
Carbon & Uranium: Proton, neutron and electron numbers can differ

Both are natural occurring isotopes of nitrogen
14N has 7 neutrons & 7 protons
15N has 8 neutrons & 7 protons
Both are in neutral state hence protons stays the same

A) 94 protons
B) Neptunium and Plutonium respectively
C) 86 Protons

A) control rods
B) cooling water out of core
C) control rod assembly
D) cooling water into the core
E) fuel rods

Desalination requires a lot of energy to operate, for example, pushing water actively from the ocean through a filter which will result in a very high cost. Furthermore, it produces a briny waste which pollutes the ocean. The high concentration of salt and toxic will destroy the local ecosystem.

A polar molecule has a positive charge at one end and a negative charge athe other. Water molecules are polar in nature, hence polar vitamins are able to dissolve in water. On the other hand, fats at non-polar. Therefore, non-polar vitamins are able to dissolve in fats, making them fat-soluble.

Acid rain is produced when sulfates and nitrates react with water molecules to form dilute sulfuric acid and dilute nitric acid respectively. Sulfates and nitrates are produced from coal power plants and vehicle exhaust emission.

A) It results in lesser electricity used as drying machine is not used to dry the laundry.
B) It results in lesser vehicles on the road, therefore lesser vehicle exhaust emission.
C) It saves electricity.
D) it makes the water heater more efficient, thus saving electricity.
E) it reduces the shipping of international produce and food, thus emitting lesser nitrates as ships and planes are not used.

The coal power plants releases sulfur dioxide and this creates sulfate particles which are responsible for the poor visibility.

The pH will be about 4 to 5.

A. Exothermic: Combustion reactions are exothermic.

B. Endothermic: Conversion from a liquid state to gaseous state requires the compound to take in energy from the skin so as to break the strong hydrogen bonds between the molecules in the liquid state.

C. Endothermic: Ice absorbs environmental heat to overcome the strong intermolecular bonds to liquefy.

Exothermic reactions release energy during the reaction. Therefore, the energy of the products will be lower than that of the reactants.

A good explosion happens vert fast and almost instantaneously, therefore the bond strength in the reactant have to be as low as possible so that it can be broken fast during the reaction. On the other hand, bond strength of the products have to be high in order to form stable products.

Heat of an object is the total energy of all the molecular motion inside that object. Temperature, on the other hand, is a measure of the average heat or thermal energy of the molecules in a substance.
Hence, in other words, temperature is the scale or the unit of measurement for heat, just like centimetres is a unit of measure for length. Therefore, you can only feel “heat” and not “temperature”.

A. An octane rating of 98 refers to the amount of octane there is in the petrol. The higher the octane rating, the less likely knocking will occur, because octane burns slower since it has longer-chained hydrocarbon and is more resistant to igniting prematurely.

B. Adding oxygenates increases the concentration of octane in the fuel, so presumedly a premium gasoline with an octane rating of 98 will have a higher concentration of oxygenates contained in the petrol mix.