DP Chemistry (last assessment 2024)

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Question 19M.1.sl.TZ2.28

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.sl.TZ2.28
Level sl Paper 1 Time zone TZ2
Command term Question number 28 Adapted from N/A
28.
[Maximum mark: 1]
19M.1.sl.TZ2.28

The following data were recorded for determining the density of three samples of silicon, Si.

Which average density value, in g cm−3, has been calculated to the correct number of significant figures?

A. 2

B. 2.3

C. 2.27

D. 2.273

[1]

Markscheme

B

Examiners report

This question about choosing the answer to a calculation with the appropriate number of significant figures discriminated well between high-scoring and low-scoring candidates. Candidates found this question relatively challenging and only 62 % chose the answer with two significant figures. The most commonly chosen distractor was C which expressed the answer to three significant figures.

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