DP Chemistry (first assessment 2025)

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Question 19N.1B.SL.TZ0.2a(i)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.1B.SL.TZ0.2a(i)
Level SL Paper 1B Time zone TZ0
Command term Describe Question number a(i) Adapted from N/A
a(i).
[Maximum mark: 2]
19N.1B.SL.TZ0.2a(i)
(a(i))

Describe the effect of increasing the voltage on the chemical yield of:

Ethanal using Pt/C:

Carbon dioxide using PtRu/C:

[2]

Markscheme

Ethanal using Pt/C:
decreases ✔

Carbon dioxide using PtRu/C:
«generally» increases AND then decreases ✔

NOTE: Accept “no clear trend/pattern” OR “increases and decreases” OR “increases, reaches a plateau and «then» decreases” for M2.