Four reactions are tested in transparent conical flasks. A technician wants to follow one reaction by placing a printed symbol under the flask. How can the technician identify the reaction that is suitable for this method?
Choose the reaction in which a gas is released without changing the appearance of the liquid.
Choose the reaction in which a suspended solid gradually makes the liquid cloudy.
Choose the reaction in which the liquid stays clear while a solid reactant gets smaller.
Choose the reaction in which the liquid stays clear while its temperature increases.
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.