DP Chemistry (first assessment 2025)

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Question 20N.1A.SL.TZ0.14

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1A.SL.TZ0.14
Level SL Paper 1A Time zone TZ0
Command term Derive Question number 14 Adapted from N/A
14.
[Maximum mark: 1]
20N.1A.SL.TZ0.14

Which combination will give you the enthalpy change for the hydrogenation of ethene to ethane, ∆H3?

A.  -∆H2+∆H1-∆H4

B.  ∆H2-∆H1+∆H4

C.  ∆H2+∆H1-∆H4

D.  -∆H2-∆H1+∆H4

[1]

Markscheme

A

Examiners report

A good majority of candidates could select the Hess' Law cycle for hydrogenation of ethene to ethane.

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