Experiments to measure the rate of reaction
3 marks · NormalIn an experiment, 0.60 g of carbon dioxide is collected in the first two minutes of the reaction between marble chips and hydrochloric acid.
Calculate the average rate of reaction in g/min during these two minutes. Show your working.
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Show answer
0.30 g/min (±0.01)
Must show: shows use of formula, shows substitution and calculation
Common mistakes: divides by an incorrect number of minutes; forgets units
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Writes correct formula: rate = mass of CO2 / time.
M2 · 1 mark · Substitutes correct values: 0.60 g and 2 min.
A1 · 1 mark · Calculates correct average rate as 0.30 g/min with unit.
Worked solution
Rate of reaction = mass of CO2 / time
Average rate = 0.30 g/min