A-LevelChemistryReaction kinetics9701/12 · Oct/Nov 2016 · Q11 Mark
The molecules of a gas at a constant temperature, T₁, have the distribution of molecular energies shown in the diagram. [Figure showing molecular energy distribution with T1 peak] When the temperature is increased to T₂, the distribution of molecular energies changes. Which diagram correctly shows this change?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AGraph where T₂ peak is lower and shifted to the right of T₁ peak, with T₂ curve having a longer high-energy tail. Both curves start at the origin.
BGraph where T₂ peak is higher and shifted to the left of T₁ peak. Both curves start at the origin.
CGraph where T₂ peak is lower and shifted to the right of T₁ peak, but T₁ curve does not start at the origin.
DGraph where T₂ peak is lower and shifted to the right of T₁ peak, but T₂ curve does not start at the origin.
✓ Correct answer
A: Graph where T₂ peak is lower and shifted to the right of T₁ peak, with T₂ curve having a longer high-energy tail. Both curves start at the origin.
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