A solid reactant is formed into 10 identical spherical granules. Each granule has a radius of 0.50 cm. The granules are kept separate so that the whole surface of each granule is exposed.
The surface area of a sphere is given by:
surface area=4πr2\text{surface area} = 4\pi r^2surface area=4πr2
Calculate the combined surface area of the 10 granules.
127 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 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.