Things may go wrong in cloning which may result in unhealthy births. And since cloning only copies the exact genes and traits, there will not be an improvement in the dog breed.

Cons:
1) GM foods has the ability to trigger an allergy in some humans
2) Ecosystems could be harmed due to the decrease in biodiversity

Pros:
1) Produces high crop yields
2) Crops can withstand extreme weather conditions

Decision: We will accept it to over the problem of famine.

a) ( CH2O) 6 or 6C + 6H2O

b) refer to hardcopy

c) different isomers have different properties. Therefore, the sweetness of different isomers of fructose will differ.

Every food we eat contains chemicals including organic food. The definition of chemicals is molecular compound. Everything is made up of molecular compound and hence food itself is already a molecular compound.

When the styrofoam is dissolved by acetone, the gas of the foaming agent is allowed to escape and therefore collapsed. When the acetone is evaporated, the solid remains is much denser as the gas has been removed.

a. LDPE is not strong enough compared to HDPE. It is because LDPE are highly branched, so the packing is more disordered and intermolecular forces amongst the molecules are weaker.

b. HDPE chain is more linear. Therefore, it is more easy to stretch.

The weak but extensive dispersion forces found in the plastic allow the molecules to slip pass one another and therefore they become aligned parallel to each other. This properties of plastic allows it to be stretched. However, the cellulose molecules in paper are held far more rigidly in place and are not free to become aligned. As such, when you pull a paper, it will tear rather than stretch.

a. (1) Stablility across period of intended use, (2) non-toxic. (3) unreactive with body fluids and (4) easy implantation.

b. The various developer of contact lenses in the world uses different composition of polymers. One of the earliest used polymers was Polymethyl methacrylate (PMMA) which is non-gas permeable and is similar to Lucite and plexiglas in terms of chemical structure. Silicone-acrylate materials are more commonly used in modern times. Later advanced rigid gas permeable (RGP) polymers contain fluorine: fluoro-silicone-acrylate polymers and fluoro-silicones. Polymacon (i.e. 38% water in composition) is common of the polymers used in soft lenses and is a polymer of 2-hydroxyethyl methacrylate (HEMA). Other methacrylates are like hioxifilcon (i.e. 48% water) and methafilcon (i.e. 55% water) or even lidofilcon (i.e. 70% water). Desirable properties are nontoxic, permeable to oxygen, comfortable to wear, and inexpensive.

c. Hard contact lenses are usually made from PMMA, which is a rigid non-gas permeable plastic. Soft contact lenses are made of silicone, which is flexible and allows oxygen to reach the eye. As such, given the properties of soft lenses, soft lenses tend to be more comfortable to wear.

One carbon atom can differ from another in the number of neutrons and electrons. All carbon atoms differ from all uranium atoms in the number of protons, neutrons and electrons.

N-14 and N-15 are isotopes which have the same number of protons but differ in their numbers of neutrons. Hence, they have different mass numbers. On the other hand, symbol N is simply a representation of the element nitrogen which is a mixture of all isotopes.

a) 94 protons
b) 93 protons: neptunium, 94 protons: plutonium
c) 86 protons

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

It is because desalination techniques requires energy to remove salts from seawater and therefore are costly.

Water soluble vitamins would be polar because like dissolves like. Water is a polar molecule. Thus, a water soluble compound would be polar too. Fat soluble vitamins will not be polar.

A) without using dryer, it can help to reduce the electrical energy usage and thus burning less coal. As a result, lesser SO2 is produced and there will be a decrease in acid rain.
B) It reduces vehicle emissions which produces NOx that can cause acid rain.
C) As smaller and larger loads use about the same amount of energy, washing larger loads will be more energy efficient
D) It can help to reduce heat loss and thus reduce burning of coal
E) Save transportion usage and thus cut down fuel usage.

A) Sulfur dioxide is produced by the plants, creating sulphate particles which cause the poor visibility.
B) Normal rain pH is about 5-6. If it is 10 times more acidic, the pH will be 4-5.

A) Exothermic; Energy required to break bonds and heat is released from burning.
B) Endothermic; Heat is absorbed therefore the water evaporates.
C) Endothermic; Heat is absorbed to melt the ice.

DHrxn = S (enthalpy of bonds broken) – S (enthalpy of bonds formed)

According to the equation above, the products (i.e. bond formation) must have a higher bond strength than reactants (i.e. bond breaking) to produce a highly exothermic reaction as a higher bond strength would correlate to more energy required to break/form the bond.

Heat is a form of energy that flows from a hotter to colder object. It is the consequence of motion at the molecular level whereas temperature is a measure of the average speed of that motion.

To explain such phenomenon to a friend (i.e. assuming he/she does not have chemical knowledge), we will use a small cup and a big cup of hot water. A small cup of hot water might be at the same temperature as the big cup of water, however, the big cup of water contains more heat because it has a larger volume of water.

A) Knocking characteristics of 98% iso-octance and 2% heptane.
B) It cannot be determined from knocking characteristics whether a fuel contains oxygenates or not. Other tests have been developed to determine the amount of oxygenates in the fuel.