alkanes exam questions

Question 1

State and explain the trend in the boiling points of these alkanes.

Answer 1

boiling point increases with increase in Mr/molecular formula/number of
carbon atoms/chain length (1)
more intermolecular forces/electrons/surface area/
surface interactions/van der Waal forces

Question 2

Suggest, with the aid of an equation, how NO is formed within an aeroplane engine.

Answer 2

N2 + O2 → 2NO

Question 3

Explain why the straight chain isomer of C10H22 is converted by the petroleum industry into its branched chain isomers.

Answer 3

Branched chains have more efficient combustion/easier to burn

Question 4

What is meant by the term radical?

Answer 4

species with an unpaired electron

Question 5

State the conditions necessary to bring about the formation of the chlorine free radicals from Cl2.

Answer 5

uv (light)/high temperature/min of 400° C/sunlight

Question 6

explain why lalala exhibits E/Z isomerism

Answer 6

both double bond have two different atoms or groups attached to them and are restricted rotation around double bond