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Combustion of Alcohols 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. Chemical Bond Energy (KJ/Mol) Chemical Bond Energy (KJ/Mol) C-H 413 O--O 497 O-H 464 C--O 745 C-O 358 C-C 346 Information about water 1 cm3 of water = 1g of water Heat Transferred = Mass of Water X Temperature Rise X 4.2 (In KJ) (in Kg) (in oC) Variables * Type of Alcohol (Independent Variable), * Container size/Volume of water. * Type of container, * The amount of carbon soot left on the container, * Volume/Mass of alcohol, * Time, * Distance between wick and container, * Tripod & gauze over stand, boss & clamp, * Starting temperature of water. Fair Test: Type of Alcohol (Independent Variable): This variable has to be the same type of alcohol, i.e....

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