a. C6(H20)6
b.
c. No, different sweetness. Different isomers of fructose have different chemical properties and likely to have different degree of sweetness.

It is simply not possible for something to be free of chemicals. Water is a chemical too. There may be chemicals that exist in the soil that the crops are being grown in. Hence, even though they are organic, they are not chemical free.

Certified organic food must be grown on land that has not been treated with prohibited substances for 36 months, but many pesticides and metals remain in the soil for longer than 3 years.

Chemical free products are just a gimmick for you to pay more. Chemical properties are the same for the same chemical, even though it may come from a man-made source.

Acetone dissolves the polymer which allows gas of the foaming agent to escape. The polymer collapses on itself and thus it becomes denser as the gas is being removed.

a. It cannot be used as it does not have the required strength to withstand its resistance.

b. The molecules of HDPE must be lined up in a way that produces the required strength. Hence, the use of the liner of HDPE allows sufficient flexibility.

Plastic is a series of long chain polymers. These chains stretch when they are all aligned and facing the same direction. Other plastics have polymer chains facing in cross directions. These plastics are stiff and often brittle. Paper is similar to cross linked polymers and does not stretch.

a. The benefits for polymers intended for use should far outweigh any risks. The 2 main properties are 1) stable over time of intended use and 2) non toxic. Other factors include low cost, lack of solubility in body fluids, lack of reactivity in body fluids in the case of implantation.

b. Several types of contact lenses are on the market and each uses a different type of polymer. Polymathy methacrylate (PMMA) is one of the earliest polymers used for rigid gas permeable lenses, is structurally similar to Lucite and Plexiglas. Silicone-acrylate materials are more commonly used. Desirable properties include being non-toxic, permeable to oxygen, comfortable to wear and inexpensive. Contact lenses should conform to eyeshape and also be easily cleaned or disposed.

c. Hard contact lenses are made of PMMA, a rigid non-gas permeable plastic. Soft lenses are made of silicone, which is flexible and allows oxygen to reach the eye. Thus, soft lenses are more comfortable and easier to wear.

They can differ from another by having different number of neutrons (isotopes). They can also differ from another by having different number of electrons (ions).
Uranium atoms differ from carbon atoms as they both have different number protons, electrons and neutrons. They also have different chemical properties.

Chemical symbol N represents the element Nitrogen, which is the percentage of all the isotopes of Nitrogen that is naturally occurring. However, the representations 14N and 15N are for specific isotopes that have masses 14 and 15 respectively.

a) 94
b) Neptunium, Plutonium
c) 86

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