Compare polycarbonate and polystyrene in the following properties and explain your answer on a molecular basis: tensile strength, impact toughness, melting point, abrasion resistance, clarity, solvent resistance, and cost. (Note: This question could be applied to any two polymers.)
What will be an ideal response?
PC is higher in tensile impact, melt point, abrasion and cost. Clarity and solvent resistance are closely comparable. Having the benzene in the backbone of the chain allows for forces to be more easily transmitted along the chain. Where the benzene ring is a pendant group those forces are not as easily transferred from one chain to another.
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The uropygial gland is located _____
a. at the base of the tail b. behind the eyes c. under the wings d. between the nares
When replacing a failed compressor, it is also a good idea to ________
A) Flush the system B) Install an in-line filter C) Replace the accumulator D) All of these
Which of the following refrigerant piping techniques help to get oil to flow up a riser in a suction line?
a. Selecting a line size that results in a very low velocity. b. Selecting a line size that is one or two sizes larger than the rest of the line. c. Installing a trap at the bottom of the riser. d. Installing a liquid-to-suction heat exchange
If governing regulations require brick veneer walls to be anchored to structural framing by using a minimum of one wall tie per 2.67 square feet, what is the minimum number of wall ties needed for a house requiring 4,520 square feet of brick veneer?
What will be an ideal response?