C2 2014

Question 1

3a Explain why nickel is ductile

Answer 1

Layers of atoms

Question 2

5c Oxides of N2 are also produced during the combustion of paraffin in air. Explain how these oxides of N2 formed

Answer 2

N2 reacts with O2 at high temperatures

Question 3

5dii Catalyst for cracking alkane

Answer 3

Zeolite

Question 4

5diii Explain why MP of dodecane is higher than MP of straight chain alkane produced by cracking

Answer 4

Larger molecule
More VDW forces between molecules

Question 5

2e The pressure of original sample of gas is doubled at T state the effect.

Answer 5

Stays the same

Question 6

5bi Identify the species formed from CClF3 that is responsible for the catalytic decomposition of ozone in the upper atmosphere

Answer 6

Cl radical

Question 7

9a Write an equation for fermentation

Answer 7

C6H12O6 -> 2CH3CH2OH + 2CO2

Question 8

9ci Meaning of mean bond enthalpy

Answer 8

Enthalpy change at constant pressure to break a covalent bond averages over a range of different molecules

Question 9

4bi Why reaction of ammonia with benzene might be considered unexpected

Answer 9

Ammonia is a nucleophile
Benzene repels nucleophiles

Question 10

4bii Suggest a combo of reagents for reaction in NO2 -> NH2

Answer 10

H2/Ni

Question 11

4bii Write equation for HNO3 + H2SO4

Answer 11

HNO3 + 2H2SO4 -> NO2+ + H3O+ + 2HSO4-