During a reaction in a flask, a gas escapes and the mass of the flask and its contents decreases. A tangent is drawn to the mass–time curve at 60 s. The tangent passes through (30 s, 152.50 g) and (100 s, 151.80 g).
What is the rate of mass loss at 60 s?
0.0070 g/s0.0070\,\mathrm{g/s}0.0070g/s
0.023 g/s0.023\,\mathrm{g/s}0.023g/s
0.012 g/s0.012\,\mathrm{g/s}0.012g/s
0.010 g/s0.010\,\mathrm{g/s}0.010g/s
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.