Explain why the flask and its contents lose mass during the reaction between calcium carbonate and dilute hydrochloric acid.
A student plotted the loss of mass against time. To find the rate of reaction at a specific time, they drew a tangent to the curve. The tangent line passes through the points (24 s,0.38 g)(24\text{ s}, 0.38\text{ g})(24 s,0.38 g) and (88 s,0.95 g)(88\text{ s}, 0.95\text{ g})(88 s,0.95 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.