Set the conditions, press MIX, and watch the gas come off. Run it again with one variable changed and compare the curves.
20.0 cm3 of X + 20.0 cm3 of Y
X and Y react in a 1 : 1 ratio
1 mol of reaction → 1 mol of gas (24 dm3 at r.t.p.)
Complete a fair comparison for each variable. Change only one setting; let both experiments finish.
Investigation method: 0 / 3
Begin with X = 0.60, Y = 0.60 mol/dm³ and 25 °C. Complete the run. Then change temperature to 35 °C and complete another run. Next change only X to 0.80; finally change only Y to 0.80, completing each run.
Other valid controlled comparisons count too. Any two completed runs may form a pair. Earn 1 mark per variable, up to 3; repeats and interrupted runs add no marks. Compare initial curve steepness for rate, and the plateau for total gas. Explain why each changes or stays the same.
Marks assess the investigation method. Your scientific explanation still needs discussion with your teacher.
How the model works. Rate = k [X][Y], and k roughly doubles for every 10 °C rise, so both concentration and temperature change how steeply the curve climbs. The final volume of gas is set only by the reactant in short supply — the limiting one — which is why a hotter run reaches the same plateau, just sooner. The flask warms as the reaction proceeds, because the reaction is exothermic. Very fast and very slow runs are played back at an adjusted speed (shown on the console); the clock always reads real reaction seconds.
No experiments yet. Every recorded experiment and committed action will be retained.
Complete an experiment to build your record.