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Rates of Reaction

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A series of free IGCSE Chemistry Lessons (Cambridge IGCSE Chemistry).
Energy changes in chemical reactions, Rates of reaction, Catalysts, Photochemical reactions, Reversible reactions and chemical equilibria.

Energy changes in reactions
How energy changes take place in chemical reactions?
What is meant by exothermic and endothermic reactions and look at activation energy and how this is effected by catalysts. Bond energy calculations
How we can use bond energies to calculate the energy change for a chemical reaction? Exothermic and Endothermic reactions
What is meant by exothermic and endothermic reactions and how to draw energy profiles for these. We then explore the idea of activation energy. Energy Changes and Calorimetry
Endothermic and exothermic reactions, and the process of bond breaking and bond making to calculate how large the energy change during a reaction will be.
Calorimetry: the practical method for measuring the energy changes that accompany reactions.
Measuring rates of reaction
How to measure the rate of a chemical reaction and how to interpret this from a graph.
The rate of a reaction depends on the frequency of collisions between the reactant molecules. Surface-area and rate of reaction
How the surface area of a solid affects the rate of reaction? Concentration and rate of reaction
How the concentration of reactants can affect the rate of a chemical reaction?
We explore the "disappearing cross" experiment which frequently comes up in the Chemistry exam.

Temperature and rate of reaction
How increasing the temperature affects the rate of a chemical reaction?
Activation energy and why this is important to reaction rate. Factors that affect Reaction Rate
How concentration, catalysts, pressure, volume, temperature and surface area can all effect the rate of a chemical reaction? Catalytic Converters
What is a catalytic converter? How do catalytic converters work?
How catalytic converters convert harmful gases into less harmful gases? Rates of Reaction
Collision theory and how it enables us to predict how different conditions will affect the rate of a reaction.
Experimental methods to determine the rate of a reaction, and the role of catalysts.
Silver Chloride Photochemistry
Silver chloride has the interesting property that it reacts to light. This photosensitive chemical will decompose into dark silver powder and chlorine. Photosynthesis
Photosynthesis and respiration reactions: how these two are connected in the biological world.
Explores the energy relationships between them, and shows how photosynthesis is an endothermic reaction, respiration is exothermic. Reversible reactions and Le Chatelier's principle
What happens when a reversible reaction reaches equilibrium and how we can change the position of the equilibrium using Le Chatelier's principle. Equilibrium and Industrial Processes
Reversible reactions, the idea of chemical equilibrium, and how conditions affect the position of equilibrium, before considering the Haber Process and the Contact Process.
How taking control of the equilibrium allows each of these processes to be optimised?

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