GCSE Chemistry Paper 2 Test Questions And Answers Graded A+ 2024.

How do you measure the rate of a reaction? - Answer By measuring the quantity of a reactant used or the quantity of product formed over time What is the equation for calculating the mean rate of a reaction by measuring the amount of reactant used? - Answer Mean rate of reaction = quantity of reactant used/time taken What is the equation for calculating the mean rate of a reaction by measuring the amount of product formed? - Answer Mean rate of reaction = quantity of product formed/time taken What units can you measure the rate of a reaction in? - Answer g/s or cm3/s or mol/s How do you calculate the rate of a reaction at a specific time from graph of the quantity of reactant used or the quantity of product formed? - Answer By measuring the gradient of a tangent drawn at that specific time on the graph What are the five factors that can affect the rate of a reaction? - Answer Concentration of reactants in solution, pressure of reacting gases, surface area of solid reactants, temperature and the presence of a catalyst What theory can we use to explain how various factors affect the rate of a reaction? - Answer Collision theory What is collision theory? - Answer Chemical reactions can occur only when reacting particles collide with each other and with sufficient energy What is the activation energy of a reaction? - Answer The minimum amount of energy that particles must have to react