DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ2.a

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.sl.TZ2.a
Level sl Paper 3 Time zone TZ2
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 2]
18M.3.sl.TZ2.a

Chemical vapour deposition (CVD) produces multi-walled carbon nanotubes (MWCNT) of a more appropriate size for use in liquid crystals than production by arc discharge.

State the source of carbon for MWCNT produced by arc discharge and by CVD.

[2]

Markscheme

Arc discharge:

graphite electrode

OR

hydrocarbon solvent

 

CVD:

gaseous hydrocarbons

 

Accept “carbon electrode”.

Accept specific examples of suitable hydrocarbon solvents (eg, methyl benzene/toluene OR cyclohexane).

Accept specific examples of suitable gaseous hydrocarbons (eg, methane, ethane, ethyne/acetylene) OR carbon monoxide OR carbon dioxide.

[2 marks]

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