Explain why an open flask containing zinc carbonate and dilute nitric acid loses mass as the reaction proceeds.
A student plotted the cumulative loss of mass against time for this reaction. To find the rate of reaction at a specific time, they drew a tangent to the curve. The tangent line passes through the points (22 s,0.29 g)(22\text{ s}, 0.29\text{ g})(22 s,0.29 g) and (86 s,1.16 g)(86\text{ s}, 1.16\text{ g})(86 s,1.16 g).
Determine the rate of reaction represented by this tangent. Give your answer to 2 significant figures and include the appropriate units.
26 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1 Calculating rates of reactions, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.