DP Chemistry (first assessment 2025)

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Question 20N.1B.SL.TZ0.f

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.1B.SL.TZ0.f
Level SL Paper 1B Time zone TZ0
Command term Comment Question number f Adapted from N/A
f.
[Maximum mark: 2]
20N.1B.SL.TZ0.f

Comment on the magnitudes of random and systematic errors in this experiment using the answers in (e).

[2]

Markscheme

Any two:

large percentage error means large systematic error «in procedure» ✔

small percentage uncertainty means small random errors ✔

random errors smaller than systematic error ✔


Award [2] for “both random and systematic errors are significant.”

Examiners report

Of the many students that obtained the mark most did through the first alternative and a lesser percentage through the third. Many students were unable to relate their calculations from 2e (percentage error and percentage uncertainty) to systematic error and random error. They either compared the calculations to incorrect errors or in some cases did not discuss the errors at all. Once again this points to a general lack on experimental understanding.

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