DP Chemistry (last assessment 2024)

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Question 19M.3.sl.TZ1.2a(ii)

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.sl.TZ1.2a(ii)
Level sl Paper 3 Time zone TZ1
Command term State Question number a(ii) Adapted from N/A
a(ii).
[Maximum mark: 1]
19M.3.sl.TZ1.2a(ii)

Powdered zinc was reacted with 25.00 cm3 of 1.000 mol dm−3 copper(II) sulfate solution in an insulated beaker. Temperature was plotted against time.

(a(ii))

State what point Y on the graph represents.

[1]

Markscheme

highest recorded temperature
OR
when rate of heat production equals rate of heat loss  [✔]

 

Note: Accept “maximum temperature”.

Accept “completion/end point of reaction”.

Examiners report

Many students gained this mark through stating this was the highest temperature recorded, though even more took advantage of the acceptance of the completion of the reaction, expressed in many different ways. Very few answered that it was when heat loss equalled heat production.

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