DP Chemistry (last assessment 2024)

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Question 18M.3.hl.TZ2.a

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

The conductivity of a germanium semiconductor can be increased by doping.

Draw the Lewis (electron dot) structure for an appropriate doping element in the box in the centre identifying the type of semiconductor formed.

M18/4/CHEMI/HP3/ENG/TZ2/18.a

[2]

Markscheme

ALTERNATIVE 1

B/Ga in circle AND Type of semiconductor: p-type

showing 3 electron pairs AND one lone electron «and hole»

 

ALTERNATIVE 2

P/As in circle AND Type of semiconductor: n-type

showing 4 electron pairs AND one non-bonded electron

 

Accept any group 13 element labelled as p-type.

Accept showing 7 electrons.

Accept any group 15 element labelled as n-type.

Accept showing 9 electrons.

Accept dots or crosses for electrons.

[2 marks]

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