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Rates of Reactions and Enzymes 100’s of free ppt’s from www.pptpoint.com library
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Rates of Reaction Chemical reactions occur when different atoms or  molecules collide: For the reaction to happen the particles must have a certain amount of energy  – this is called the ACTIVATION ENERGY. The rate at which the reaction happens depends on four things: 1) The temperature of the reactants, 2) Their concentration 3) Their surface area 4) Whether or not a catalyst is used
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Measuring rate of reaction Two common ways: 1) Measure how fast the products  are formed 2)  Measure how fast the  reactants are used up
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Rate of reaction graph Amount of  product  formed Time Slower reaction Fast rate of  reaction here Slower rate of reaction here due to  reactants being used up
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Enzymes are biological catalysts.  They help the reactions that occur in our bodies  by controlling the rate of reaction.  
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