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Edexcel IGCSE Chemistry Topic 3 - Physical Chemistry 




 Below is everything the examiners think you know, if you're not sure of something click on the link to watch my YouTube video explanation. For a copy of these you can print off, get the FREE revision guide I wrote for you.


 • I can describe the energy changes in an exothermic or and endothermic reaction  Video 1  Video 2 

 • I can describe simple calorimetry experiments for reactions such as combustion, displacement, dissolving and neutralisation

 • I can determine the energy change in a reaction using the expression Q = mcΔT

 • I can draw the reaction profiles for endothermic and exothermic reactions

 • I can describe endothermic reactions as bond-breaking and exothermic reactions as bond-making

 • I can calculate the energy change in a reaction

 • I can describe experiments to investigate temperature changes during dissolving, neutralisation, combustion, displacement

 • I can state the factors that affect the rate of a reaction, including surface area, concentration, temperature and a catalyst

 • I can use collision theory to explain how different factors (temperature/ pressure/ concentration/ surface area) will affect the rate of a reaction

 • I can describe and explain how a change in temperature will affect a rate of a reaction

 • I can describe and explain how a change in pressure will affect a rate of a reaction

 • I can describe and explain how a change in concentration will affect a rate of a reaction

 • I can describe and explain how a change in surface area will affect a rate of a reaction Video 1  Video 2 

 • I can describe and explain how catalyst will affect a rate of a reaction

 • I can use collision theory to explain how different factors (temperature/ pressure/ concentration/ surface area) will affect the rate of a reaction

 • I can describe how a catalyst lowers activation energy

 • I can state the definition of a catalyst

 • I can draw and explain reaction profile diagrams showing the change in ΔH and activation energy

 • I can describe an investigation using marble chips to show the effects of changing surface area and acid concentration

 • I can describe an experiment into the decomposition of hydrogen peroxide using a range of catalysts

 • I can use symbols to represent a reversible reaction

 • I can describe what happens to ammonium chloride upon heating and cooling

 • I can describe what happens to copper sulfate upon addition and removal of water

 • I can state that a reversible reaction can reach dynamic equilibrium in a sealed container

 • I can describe what happens to the energy in a reversible reaction, where one direction is exothermic, and the other is endothermic

 • I can state the characteristics of a reaction that is at dynamic equilibrium

 • I can describe what is happening to the rate of reactions when they have reached equilibrium

 • I can state why a catalyst does not affect the position of equilibrium in a reversible reaction

 • I can describe the effects of changing temperature or pressure on the position of equilibrium in a reversible reaction