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CAIE A-Level Chemistry Mathematical Requirements

Practise CAIE A-Level Chemistry mathematical skills through data-table graph plotting, best-fit lines and chemical quantities such as ΔG and temperature.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • plot ΔG against temperature from tabulated data and draw a ruled best-fit line

Covered syllabus points

M.1—Arithmetic, rounding, percentages, means and significant figuresM.2—Unit conversions, standard form, logs and algebraM.3—Graphs, proportionality, gradients and interceptsM.4—Curves, models, logarithms and core chemical formulaeM.5—Key quantities, symbols and units

Mathematical requirements question 1

[Maximum number: 2]

Calcium carbonate decomposes on heating.

CaCO3( s)→CaO( s)+CO2( g)\mathrm{CaCO}_{3}(\mathrm{~s}) \rightarrow \mathrm{CaO}(\mathrm{~s})+\mathrm{CO}_{2}(\mathrm{~g})

Table 4.1 shows the values of the Gibbs free energy change, ΔG⊖\Delta G^{\ominus}, for this reaction at various temperatures.

Table 4.1

Table 4.1

Assume the standard enthalpy change, ΔH⊖\Delta H^{\ominus}, and the standard entropy change, ΔS⊖\Delta S^{\ominus}, for this reaction remain constant over this temperature range.

Use the data in Table 4.1 to plot a graph of ΔG⊖\Delta G^{\ominus} against T on the grid.

Figure for Question Mathematical requirements question 1 — CAIE A-Level Chemistry A2
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