Gaps

Question 1

PVC Disposal

Answer 1

• burning produces HCl gas
• this HCl gas is corrosive
• Now PVC is dissolved, and the precipitate is collected and reused.
• an alkali can be used to react with the HCl and neutralise.

Question 2

Polymers to fuel

Answer 2

incinerated to produce thermal energy

Question 3

Recycling polymers process

Answer 3

sorted, chopped into flakes, washed, melted and chopped into pellets.

Question 4

Feedstock recycling

Answer 4

• reclaims the monomer
• now it can be used raw materials for the production of new polymers
• plastic doesn’t need to be sorted first.

Question 5

what must we do to an equation of addition polymerisation? (like when an alkene is turned into a polymer)

Answer 5

BALANCE using “n”

Question 6

What must a molecule have to display E/Z isomerism?

Answer 6

A double bond
Two different species attached to each carbon.

Question 7

How does the size of an alcohol effect its solubility?

Answer 7

The larger the molecule, the less influence of the OH group. solubility decreases as carbon chain increases

Question 8

bond length and bond enthalpy?

Answer 8

an increase in bond length = a decrease in bond enthalpy (energy required to break a bond)

Question 9

Why do precipitate tests need to be in that specific order? (2 points)

Answer 9

• BaCO3 is a precipitate.
• AgSO4 is a precipitate

Question 10

Photodegradable polymers

Answer 10

bonds in polymers are weakened by absorbing light. the polymer will start to degrade.