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MATSEC SEC 06 Chemistry · Malta
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September 2025 · P2 · Q9
Level 2-3View question
Rates of reaction
Part a
- Add 50.0 cm3 of the dilute hydrochloric acid to the 45.0 g of powdered magnesium carbonate in a flask connected to the gas syringe, and start the stopwatch.
- Record the volume of gas collected at regular time intervals until the reaction stops.
- Repeat with the 45.0 g of granules, keeping the acid volume, concentration and temperature the same.
- Compare how quickly each produces the gas (e.g. plot both on the same axes).
Part b
Both reactions make the same total volume of gas (same mass of carbonate), so the two curves finish at the same height. The only difference is how fast they get there; the powder curve is steeper and flattens first.
Examiner Tips
To test surface area fairly, change only the form of the solid (powder vs granules) and keep mass, acid volume and concentration, and temperature the same. Powder has a larger surface area, so it reacts faster, a steeper curve that reaches the same final volume of gas.
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