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Comparing the enthalpy changes of combustion of different alcohols
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AS Chemistry Coursework Comparing the enthalpy changes of combustion of different alcohols Apparatus: * Spirit burners containing: o Methanol o Ethanol o Propan-1-ol o Butan-1-ol * Copper can * 0-110?C thermometer * 100cm3 measuring cylinder * Balance * 5 heatproof mats * Clamp and clamp stand Method * Set up apparatus as shown, clamping the copper can 10cm above the spirit burner, all on top of a heatproof mat. * Carefully measure 200cm3 of water and fill copper can. * Record mass of water (1g=1cm3, ? 200g=200cm3). * Use thermometer to measure water temperature, record temperature in a results table. * Weight spirit burner with lid on, record mass in grams. * Arrange 3 heatproof mats around burner and stand, covering back and both sides. * Put goggles on. * Take lid off spirit burner, light burner, place 5th heatproof mat in front off burner and begin stirring water. * When water temperature rises to near 20?C put lid on burner, extinguishing flame. * Keep stirring water, record the highest temperature. * Weight spirit...
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