The same applies when constructing new bonds to form the carbon dioxide and water. It is important that the wick fits tightly in the wick holder and that the wick holder fits tightly in the burner. This investigation involves burning alcohol in the air. Is it possible that combustion may be incomplete, giving carbon monoxide amongst the products?
Propanol and propanol are isomers same molecular formula, different structures Do they produce the same amount of heat on combustion?
These graphs had shown that as the chain of atoms became longer with each alcohol, the number of bonds that had to be broken rose and so more energy was required to break them. One possible source is: Full combustion should generate two products only: Conduction of heat from the tin can. A small current of air is drawn through the spiral, to provide a steady supply of oxygen to the wick, with the water constantly being stirred by the stirrer.
This may give rise to parts of the water is at a different temperature to the rest, altering my degree of accuracy at which I read off the thermometer. Each alcohol burns stronger with more carbon atoms, increasing the ferocity of the flame, which affects the height the wick was away from the tin can, providing more energy if the flame is higher or stronger.
However there are some areas of inaccuracy during the experiment that would have altered the readings: Here are some sample results: However there are 2 other graphs that were plotted from the original data before it was averaged.
Energy being lost via sound and light and not heat, which lowers values as some energy has transferred into something else.
The thermometer bulb was touching the bottom of the tin can, which may have inadvertently gained extra degrees on its reading, not giving the real temperature of the water.
If capacity is more than 50 cm3, reduce it, for instance by packing with mineral wool, or partially filling with epoxy. Which alcohol produces the most energy per gram? I believe that I had conducted the experiment accurately, and recording enough results to provide a sound conclusion.
It is kept on until the apparatus temperature reaches the equivalent of the temperature in the experiment with the alcohol. This seemed to happen because of energy loss is various places that I could not help as it could not all be absorbed by the tin can.
Heat losses will almost certainly vary considerably. I will be investigating 6 alcohols, using predictions and a practical to guide me through this experiment and form an overall conclusion.
Overall, this experiment has proven that it is able to record very reliable and accurate results but there an alternate method of measuring the heat of combustion, as the diagram shows below: This just shows how effective this method is to getting closer to the extremely accurate result.
Alcohols can be used as a substitute for hydrocarbon fuels, and so methods of producing alcohols are very important.
Other improvements could be made for a more efficient and accurate experiment, such as better equipment to obtain more accurate results. Or by having a larger variety of alcohols, extending your range of results or repeating the experiment more than 4 times to secure extremely good readings, giving a more reliable conclusion.
Heat energy is lost via convection of air around the wick. The burner is filled two-thirds of the way with the alcohol and the starting temperature is recorded.
It can also be said that there was not enough oxygen supply for the alcohol to burn completely, in complete combustion, because of the heat-proof mats restricting the amount of oxygen that could be supplied.
This may be because I either did not take enough care in obtaining these results, in terms of accurately reading off the thermometer etc. The amount of heat produced per mole of alcohol will be proportional to the amount of air present. On the other hand, my line of best fit was overall, lower than the processed data graph.
Here is the calculated energy change, which is a little simplified to save time and space. Which alcohol produces the most energy per mole?In this investigation I will be burning alcohol's to heat up a can of water.
I will be burning four alcohol's, methanol, ethanol, propanol and butanol.
The aim is to find out how much energy is produced when burning these alcohols. Alcohol's react with oxygen in the air to form water and carbon dioxide.
The reaction that is involved in burning alcohols is. The alcohols will be burnt to heat up a test tube of water, I aim is to find out how much energy is produced when burning the following alcohols: Methanol, Ethanol, Propanol, Butanol, and Pentanol.
Any form of burning is an exothermic reaction (heat is given out), this means that the reactants energy is higher than that of the product. In this investigation I will be burning alcohol's to heat up a can of water.
I will be burning four alcohol's, methanol, ethanol, propanol and butanol. The aim is to find out how much energy is produced when burning these alcohols.3/5(3).
2 Up votes, mark as useful. 0 Down votes, Mass of water (60g) Mass of alcohol (g) Time (10 minutes in total, 1 minute per recording) Room temperature (20°C) Documents Similar To Heat of combustion of alcohol mint-body.com Combustion of Alcohols. Uploaded by.
iibtii. IB Chemistry IA: Energetics.5/5(2). Light the wick and let the alcohol heat up the water until it is raised by 30 degrees 0. The thermometer must be swirled around the water before a reading can be taken Heptanol.2 kj/kg/oC Heat gained by water = mass (Kg) x temp.Download