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CAIE A-Level Chemistry M.3 Graphs, Proportionality, Gradients and Intercepts

Practise testing proportionality and extracting gradients and intercepts from accurate best-fit graphs.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

M.3—Graphs, proportionality, gradients and intercepts 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 M.3—Graphs, proportionality, gradients and intercepts question 1 — CAIE A-Level Chemistry A2
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