O-LevelChemistryRates of Reaction5070/11 · May/June 2021 · Q191 Mark
Magnesium reacts with dilute sulfuric acid. Mg(s) + H₂SO₄(aq) → MgSO₄(aq) + H₂(g) Two experiments are carried out at 25 °C. experiment 1 24.0 g of powdered magnesium is reacted with 100 cm³ of 1.0 mol/dm³ sulfuric acid. experiment 2 24.0 g of powdered magnesium is reacted with 50 cm³ of 2.0 mol/dm³ sulfuric acid. During each experiment the volume of hydrogen produced is measured. The results are plotted on a graph. Which graph is correct?
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 Experiment 2 is steeper than Experiment 1, and both reach the same final volume.
BGraph where Experiment 1 is steeper than Experiment 2, and both reach the same final volume.
CGraph where Experiment 2 is steeper than Experiment 1, but Experiment 1 reaches a higher final volume.
DGraph where Experiment 1 is steeper than Experiment 2, and Experiment 1 reaches a higher final volume.
✓ Correct answer
A: Graph where Experiment 2 is steeper than Experiment 1, and both reach the same final volume.
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