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Adam Franks 10BW GCSE CHEMISTRY COURSEWORK Skill Area:"P". Planning. Background information The breaking of bonds is endothermic, and the making of bonds is exothermic. The difference between the two decides whether a reaction is exothermic or endothermic. We can calculate the theoretical change in energy, by using given values, of the energy required to break certain bonds. Prediction I predict that if the Mr value of the alcohol / and the number of carbon atoms is increased that the heat of combustion will increase. I predict that the heat of combustion will increase in a regular manner aswell. Equations 1C2H5OH + 3O2 2CO2 + 3H2O 1C3H7OH + 4.5O2 3CO2 + 4H2O 1C4H9OH + 6O2 4CO2 + 5H2O 1C5H11OH + 7.5O2 5CO2 + 6H2O 1C6H13OH + 3O2 6CO2 + 7H2O PREDICTING HEATS OF COMBUSTION, BY CALCULATING THEM USING BOND ENERGY VALUES. 1.) Ethanol H H H C C O H + 3O=O 2O=C=O + O H H H H Bonds Broken (ENDOTHERMIC) ?H = + Bonds Formed (EXOTHERMIC) ?H = - 5 x C-H is 5 x 413 = +2065 4 x C-O is...

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