A student adds 0.50 g of copper(II) oxide powder to hydrogen peroxide solution. Oxygen is given off faster than from the same solution with no powder added.
Which further result shows that copper(II) oxide is a catalyst for this reaction?
The same mass of copper(II) oxide is recovered once the reaction has finished.
A greater total volume of oxygen is collected once the reaction has finished.
The mixture gets hotter because the copper(II) oxide gives the particles energy.
The mass of copper(II) oxide increases because it combines with the oxygen.
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.