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Comparing the Enthalpy Changes of Combustion of Different Alcohols Aim Combustion of alcohols is exothermic; energy is given out. Salter's Chemical storylines says, " Different fuels have different enthalpy changes". I will investigate how the carbon chain length of the alcohol affects its enthalpy of combustion. Preliminary Work Chemistry for you page 184 says, "breaking bonds requires energy, it is endothermic ". It also says " making new bonds gives out energy it is exothermic". The difference between the two determines whether the reaction is exothermic or endothermic. It also determines how much the total enthalpy of combustion is this can be shown in energy level diagrams. Diagram 1 is an energy level diagram of an exothermic reaction. It shows that more energy is given out making bonds than is used breaking them. Combustion is an exothermic reaction. Diagram 2 is an energy level diagram of an endothermic reaction. It shows that more energy is used...

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