CourseCourseConceptConceptDocsDocuments

CAIE A-Level Chemistry AS 1.4.2 Equations to Represent First Second Questions

Practise constructing ionisation-energy equations with correct species, electron changes and state symbols for first, second and subsequent ionisation energies.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Construct equations with state symbols to represent first, second and subsequent ionisation energies.

CAIE A-Level Chemistry AS 1.4.2 Equations to Represent First Second Questions question 1

[Maximum number: 1]

Equations involving four enthalpy changes are shown.

Na( g)→Na+(g)+e−ΔH=WNa( g)→Na2+(g)+2e−ΔH=XNa( s)→Na( g)ΔH=YNa( s)→Na2+(g)+2e−ΔH=Z\begin{array}{ll} \mathrm{Na}(\mathrm{~g}) \rightarrow \mathrm{Na}^{+}(\mathrm{g})+\mathrm{e}^{-} & \Delta H=\mathrm{W} \\ \mathrm{Na}(\mathrm{~g}) \rightarrow \mathrm{Na}^{2+}(\mathrm{g})+2 \mathrm{e}^{-} & \Delta H=\mathrm{X} \\ \mathrm{Na}(\mathrm{~s}) \rightarrow \mathrm{Na}(\mathrm{~g}) & \Delta H=\mathrm{Y} \\ \mathrm{Na}(\mathrm{~s}) \rightarrow \mathrm{Na}^{2+}(\mathrm{g})+2 \mathrm{e}^{-} & \Delta H=\mathrm{Z} \end{array}

Which equation represents the second ionisation energy of sodium?

A

X

B

X+Y-W

C

X-W

D

Z-W

All question bank results loaded