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CAIE A-Level Chemistry AS 5.1.3 Terms Questions

Practise defining standard enthalpy changes of formation, combustion, neutralisation and atomisation using CAIE 9701 AS questions and mark schemes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Define and use the standard enthalpy-change terms, including formation, combustion, neutralisation and atomisation.

CAIE A-Level Chemistry AS 5.1.3 Terms Questions question 1

[Maximum number: 1]

Which equation represents the reaction whose standard enthalpy change is the standard enthalpy change of formation of water?

A

2H2( g)+O2( g)→2H2O(l)2 \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})

B

H2( g)+12O2( g)→H2O(l)\mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})

C

H+(aq)+OH−(aq)→H2O(l)\mathrm{H}^{+}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})

D

2H(g)+O(g)→H2O(l)2 \mathrm{H}(\mathrm{g})+\mathrm{O}(\mathrm{g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})

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