DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ2.a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ2.a
Level hl Paper 2 Time zone TZ2
Command term Write Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.2.hl.TZ2.a

Ethyne, C2H2, reacts with oxygen in welding torches.

Write an equation for the complete combustion of ethyne.

[1]

Markscheme

C2H2 (g) + 2.5O2 (g) → 2CO2 (g) + H2O (l)

OR

2C2H2 (g) + 5O2 (g) → 4CO2 (g) + 2H2O (l)    [✔]

Examiners report

All candidates were able to write the correct reactants/products for combustion of ethyne, but a few failed to balance correctly.

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