Draw and interpret Extended writing: write or graphs showing the instructions to another Use the results and graph to quantity of product student how to calculate determine the mean rate of formed or quantity of the mean rate of reaction. reaction. reactant used up against time. Explain what is meant by A similar reaction can be the units: done with magnesium and Draw tangents to the g/s hydrochloric acid. The quantity of reactant or curves on graphs cm3/s product can be measured by and use the slope of the mol/s. the mass in grams, by a tangent as a measure of volume in cm3 or by an the rate of reaction. amount in moles. The units of rate of reaction (HT only) Calculate the may be given as g/s, cm3/s gradient of a tangent to or mol/s. the curve on these graphs as a measure of rate of reaction at a specific time. MS 1a, 1c, 1d, 4a, 4b, 4c, 4d, 4e 5.6.1.2 Factors affect the rates Be able to recall how 2 Extended writing: explain Required practical 11: Video clips: of chemical reactions changing these factors the effect on the rate of include: the concentrations of affects the rate of reaction of the following investigate how changes in reactants in solution, the chemical reactions. factors: concentration affect the YouTube: pressure of reacting gases, rates of reactions by a the surface area of solid WS 2.1, 2.2, 2.3, 2.4, concentration method involving measuring reactants, the temperature 2.6, 2.7 pressure the volume of a gas and the presence of surface area produced and a method catalysts. MS 1a, 1c, 1d, 2a, 2b, temperature involving a change in colour 4a, 4b, 4c, 4d, 4e catalyst. or turbidity.
or The quantity of reactant or product can be measured by the mass in grams, by a volume in cm3 or by an amount in moles. The units of rate of reaction may be given as g/s, cm3/s or mol/s. Draw and interpret graphs showing the quantity of product formed or quantity of reactant used up against time. Draw tangents to the curves on graphs and use the slope of the tangent as a measure of the rate of reaction. (HT only) Calculate the gradient of a tangent to the curve on these graphs as a measure of rate of reaction at a specific time. MS 1a, 1c, 1d, 4a, 4b, 4c, 4d, 4e Extended writing: write instructions to another student how to calculate the mean rate of reaction. Explain what is meant by the units: g/s cm3/s mol/s. Use the results and graph to determine the mean rate of reaction. A similar reaction can be done with magnesium and hydrochloric acid. 5.6.1.2 Factors affect the rates of chemical reactions include: the concentrations of reactants in solution, the pressure of reacting gases, the surface area of solid reactants, the temperature and the presence of catalysts. Be able to recall how changing these factors affects the rate of chemical reactions. WS 2.1, 2.2, 2.3, 2.4, 2.6, 2.7 MS 1a, 1c, 1d, 2a, 2b, 4a, 4b, 4c, 4d, 4e 2 Extended writing: explain the effect on the rate of reaction of the following factors: concentration pressure surface area temperature catalyst. Required practical 11: investigate how changes in concentration affect the rates of reactions by a method involving measuring the volume of a gas produced and a method involving a change in colour or turbidity. Video clips: YouTube:
AQA-8464-SOW-RATE.DOCX