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The rate of a chemical reaction is defined as the rate of change in concentration of a reactant or product divided by its coefficient from the balanced equation. A negative sign is used with rates of change of reactants and a positive sign with those of products, ensuring that the reaction rate is always a positive quantity.
This video supports two experiments that can be used to demonstrate each approach: Initial rate method – investigating the effect of concentration on rate using the iodine clock reaction. Continuous monitoring method – investigating the effect of temperature on rate by measuring volume of gas produced.
Find supporting resources including pause-and-think questions, technician notes, worksheets, and more at https://rsc.li/3hmgilsRate of reaction can be determ...
Explore what makes a reaction happen by colliding atoms and molecules. Design experiments with different reactions, concentrations, and temperatures. When are reactions reversible? What affects the rate of a reaction?
With an increase in the concentration of a solution, the rate of reaction will increase. This is because there will be more reactant particles in a given volume, allowing more frequent and successful collisions, increasing the rate of reaction. Investigating the effect of surface area on the rate of reaction
Watch the practical video to show learners how to monitor the rate of reaction and identify the effects of changing temperature and concentration, using both initial rate and continuous monitoring methods. Plus, download the resources for teacher and technician notes, follow-up worksheets and more.
Rates usually increase when the concentration of one or more of the reactants increases. For example, calcium carbonate (CaCO 3 ) deteriorates as a result of its reaction with the pollutant sulfur dioxide.
