Gcse Isa Chemistry Calorimetry

Topics: Alkane, Ethanol, Thermodynamics Pages: 2 (426 words) Published: April 21, 2013
I believe that alcoholic compounds with bigger relative formula mass will release more energy in combustion reaction than the less alcoholic hydrocarbons compounds. Equipment:
Different types of alcohols in spirit burner (CH4, C2H6, C3H8, C4H10, C5H12), Thermometer, water, beaker, scale, measuring cylinder, tripods, clamp, gauze, heat mat, lighter or matches. Hazard:
Most of alcohol we using are flammable, irritant, toxic and harmful. 1 provide spirit burners which have removable glass caps, this makes it easier and safer to extinguish the flames. 2 Make sure the wick fits tightly in the wick holder and that the wick holder fits tightly in the burner. 3 Fill and label spirit burners or dropper bottles with alcohols in advance of the experiment. Ensure any excess alcohol is wiped off the side of the burners. 5 careful considerations must be given on igniting the alcohols.  The spirit burners must be kept upright when lighting. Do not tip onto the side. 6 make sure the alcohols are kept away from any source of heat. 7 don't burn your self by touching any flames or hot water

1- Fit the beaker inside the tripod, fill the beaker with 100ml of water after measuring it by the cylinder, and take the initial temperature of water by using thermometer, 2- Measure the mass of the first burner spirit (Methanol) and record it, Put the spirit burner on the heat-mat under the beaker and ignite it 3- Keep stirring the water, when the temperature reach 50ºC turn off the flame. 4- Reweigh the burner and workout the difference.

5- Repeat the same steps 3 times and take the average of the alcohol used in burning. 6- Apply the same steps above with the all-different types of alcohol remaining to test (Ethanol, Propanol, Butanol, Pentanol) 7- Finally you need to work out the energy released from each alcohol by applying this calculation   q = (specific heat capacity of water 4.2) x mass of water(g) x Δt change in temperature(ºC) Then divide the...
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