random

Question 1

monomer units of terylene?

Answer 1

benzene-1,4-dioic acid
ethane-1,2-diol

Question 2

monomer units of nylon-6,6?

Answer 2

hexanedioic acid
hexane-1,6-diamine

Question 3

monomer units of kevlar?

Answer 3

benzene-1,4-dicarboxylic acid
benzene-1,4-diamine

Question 4

conditions for fermentation of glucose to produce ethanol?

Answer 4

-yeast~ provides enzymes which are the catalyst
-37°C~ so enzymes don’t denature
-absence of O₂~ (anaerobic respiration)

Question 5

advantages of fermentation of glucose to produce ethanol?

Answer 5

-low energy input
-sugar cane is a renewable resource
-“carbon-neutral”

Question 6

disadvantages of fermentation of glucose to produce ethanol?

Answer 6

-low yield
-impure product
-batch process
-environmental issues (deforestation/loss of habitats due to use of land for crop production)
-slow rate of reaction

Question 7

conditions for direct hydration of ethene to produce ethanol?

Answer 7

-steam
-conc. H₂SO₄ catalyst

Question 8

advantages of direct hydration of ethene to produce ethanol?

Answer 8

-high yield
-pure product
-continuous process
-fast rate of reaction

Question 9

disadvantages of direct hydration of ethene to produce ethanol?

Answer 9

-high energy input
-ethene is obtained from crude oil which is non-renewable

Question 10

explain why CO₂ causes global warming (2)

Answer 10

-C=O bonds absorb IR radiation
-IR radiation emitted by the earth doesn’t escape

Question 11

why does CO₂ absorb IR radiation? (1)

Answer 11

bonds vibrate at the same frequency as IR radiation