DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ2.a

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.hl.TZ2.a
Level hl Paper 3 Time zone TZ2
Command term Sketch Question number a Adapted from N/A
a.
[Maximum mark: 2]
19M.3.hl.TZ2.a

Semiconductors and light-sensitive dyes are used in photovoltaic cells.

Sketch graphs to show the general effect of increasing temperature on the electrical conductivity of semiconductors and metals on the axes below.

[2]

Markscheme

Semiconductors:
increases  [✔]

Metals:
decreases  [✔]

 

Note: Accept any graph showing general increase for semiconductor.

Accept any graph showing general decrease for metal.

Accept a graph showing vertical section below transition temperature for a superconducting metal.

Examiners report

Several candidates managed one mark to show conductivity of semiconductors on increasing the temperature but were unable to show that generally conductivity decreases for metals when the temperature is increased.

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