DP Chemistry (first assessment 2025)

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Question 19M.2.SL.TZ2.a

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

Determine from the graph the rate of reaction at 20 s, in cm3 s−1, showing your working.

[3]

Markscheme

tangent drawn to curve at t = 20 s  [✔]

slope/gradient calculation  [✔]

0.35 «cm3 s–1»  [✔]

 

Note: Accept values in the range 0.32–0.42 «cm3 s–1» 

Examiners report

This part proved to be challenging for some candidates whereas other candidates were able to draw a tangent at 20 sec and then calculate the rate. A significant number of candidates calculated the average rate and achieved one mark.

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