a) C6(H20)6
c) No. Glucose and Galactose are isomers of fructose but all have different sweetness levels as they have different properties.

1. Even water is a chemical substance which means it is definitely impossible to have a chemical free diet, and also not all chemicals are bad for the body.

Because Styrofoam consists mainly of air, when it is dissolved in the acetone, the air inside is released and once the acetone is allowed to evaporate, what remains is product with greater density.

a) LDPE cannot be used as it does not have the required strength and can tear easily.
b) HDPE molecules are lined up and arranged in a way which provides sufficient strength and flexibility.

When plastic is stretched, the molecules become aligned parallel to each other in the direction of the pull. However, this alteration is irreversible and if pulling is prolonged, the plastic will break. When paper is pulled, instead of stretching, it tears. This is due to the cellulose molecules in the paper being held more rigidly in place and are not free to become aligned.

a)
i. stable over time of intended use
ii. non toxic
iii. lack of solubility in bodily fluids
iv. lack of reactivity in bodily fluids

b) Contact lenses are made of PMMA, rigid gas permeable lenses, and Polymacon, are used in soft lenses. Desirable properties of these materials include non toxic, permeable to oxygen, comfortable to wear and inexpensive.

c) Hard lenses use PMMA, while soft lenses use silicone. Soft lenses are more flexible and allows oxygen to reach the eyes, making it more flexible and easier to wear.