Yeast ferments sugar to produce carbon dioxide.
Mixture 1 is 100 cm3100\,\mathrm{cm^{3}}100cm3 of a sugar solution. Mixture 2 is 50 cm350\,\mathrm{cm^{3}}50cm3 of a sugar solution that is twice as concentrated as the solution in Mixture 1.
The same amount of yeast is added to each mixture, and both are kept at the same temperature. Fermentation continues until all of the sugar in each mixture has been used up.
A student records the volume of carbon dioxide produced over time for each mixture. How does the curve for Mixture 2 compare with the curve for Mixture 1?
It has a steeper initial gradient and levels off at the same volume of carbon dioxide.
It has a less steep initial gradient and levels off at the same volume of carbon dioxide.
It has a steeper initial gradient and levels off at twice the volume of carbon dioxide.
It has the same initial gradient and levels off at half the volume of carbon dioxide.
122 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.