Solid R reacts with solution S to produce a gas. The gas escapes from an open flask standing on a balance.
Two identical flasks contain equal volumes of solution S at the same concentration and temperature. The solution is in excess in both flasks. In flask A, 1.50 g of solid R is added as compact pellets. In flask B, 1.50 g of solid R is added as a powder. The total mass at the start is the same for both flasks.
Describe and explain how the balance readings for flask B would differ from those for flask A, both during the reaction and when the reaction is complete.
122 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.