DP Chemistry (last assessment 2024)

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Question 22N.2.hl.TZ0.d.iv

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.hl.TZ0.d.iv
Level hl Paper 2 Time zone TZ0
Command term Calculate Question number d.iv Adapted from N/A
d.iv.
[Maximum mark: 1]
22N.2.hl.TZ0.d.iv

Ammonium nitrate, NH4NO3, is used as a high nitrogen fertilizer.

Cold packs contain ammonium nitrate and water separated by a membrane.

The cold pack contains 9.50 g of ammonium nitrate. Calculate the percentage error in the experimentally determined mass of ammonium nitrate obtained in (d)(ii).

If you did not obtain an answer in (d)(ii), use 6.55 g, although this is not the correct answer.

[1]

Markscheme

«% error = 9.50 g-8.01 g9.50 g×100 %=» 15.7«%» ✔

 

Accept range 14.7 – 15.8«%».

If 6.55 g used then answer is 31.1«%».

Examiners report

About 70% of candidates correctly calculated the percentage error, though a significant minority divided the difference by the value obtained rather than the true value.

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