6) Compared to its crystalline form, glass is generally: a) more dense b) less d

ID: 931608 • Letter: 6

Question

6) Compared to its crystalline form, glass is generally:

a) more dense

b) less dense

c) porous

d) opaque

7) In which of the following materials would be the most permeable to nitrogen?

a) Polydimethylsiloxane D(N2) = 3.5 x 10-5 cm2/s

b) Polyimide D(N2) = 1.0 x 10-9 cm2/s

c) Polyisoprene D(N2) = 1.0 x 10-7 cm2/s

d) Polycarbonate D(N2) = 1.0 x 10-8 cm2/s
.

8) Which of the following conducts electricity the least at room temperature and pressure?

a) graphite

b) copper

c) iron

d) polyethylene

9) Which of the following would be the most ionic bond?

a) C-H

b) Si-O

c) Cu-Cu

d) Cs-F

Please answer all of them without guessing!!! Thanks

(6) Glass is generally less dense than its crystalline structure. Option (b) is correct.

(7) Polyimide would be the most permeable to nitrogen. Option (b) is correct.

(8) Graphite conducts electricity the least at room temperature and pressure. Option (a) is correct .

(9) Cs-F bond would be the most ionic bond. Option (d) is correct.

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