This lesson is designed for the NEW AQA Trilogy GCSE Chemistry, differentiated for most abilities. For more lessons to meet specification points for the new AQA Trilogy specification for Biology, Chemistry and Physics please see me TES shop: https://www.tes.com/teaching-resources/shop/MissBScienceResources Pupils learn what is meant by rate of reaction, look at the calculation (they revisit this i most lessons so is an introduction at this stage), complete a couple of experiments to look at rate of reaction and finish the lesson looking at tangents. Includes: slide animations, embedded videos with link in the notes (where a video is included), learning tasks/practice. This lesson meets the following specification point: 5.6.1 Rate of reaction 5.6.1.1 Calculating rates of reactions The rate of a chemical reaction can be found by measuring the quantity of a reactant used or the quantity of product formed over time: mean rate o f reaction = quantity o f reactant used time taken mean rate o f reaction = quantity o f product formed time taken The quantity of reactant or product can be measured by the mass in grams or by a volume in cm3. The units of rate of reaction may be given as g/s or cm3/s. For the Higher Tier, students are also required to use quantity of reactants in terms of moles and units for rate of reaction in mol/s. Students should be able to: • calculate the mean rate of a reaction from given information about the quantity of a reactant used or the quantity of a product formed and the time taken • draw, and interpret, graphs showing the quantity of product formed or quantity of reactant used up against time • draw tangents to the curves on these 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.