PPQ P2

Question 1

2018 P2

Catalytic Cracking Conditions

Answer 1

• zeolite catalyst
• slight pressure

Question 2

2018 P2

Explain why a single radical can cause the decomposition of many molecules of ozone

Answer 2

• Cl radical is regenerated

Cl∙ + O3 → ClO∙ + O2
ClO∙ + O3 → 2 O2 + Cl∙

Question 3

2018 P2

In a nucleophilic substitution reaction, explain why the haloalkane is attacked by the nucleophile

Answer 3

• Br is more electronegative than C
• LP on nucleophile is donated to delta +ve C

Question 4

2018 P2

Give 2 ways of maximising the yield of propanal obtained by distillation of reaction mixture

Answer 4

1) keep temperature below 97℃ (BPT of propanol = 97℃, BPT of propanal = 49℃)
2) keep beaker containing propanal in ice bath

Question 5

2A + B ⇋ 3C + D
(Moles Of: A = 0.17, B = 0.21, C = 1.05, D = 0.076)
Justify the statement that adding more water to the quilibrium mixture will lower the amount of A in the mixture

Answer 5

• conc decreases
• equilibrium moves to side with more moles
• to oppose decrease in conc