An analysis of the burning alcohols to heat up a can of water
Conduction of heat from the tin can. However, in reality this rarely occurs.
Aims To investigate the temperature rise produced in a known mass of water by the combustion of ethanol, propanol, butanol and pentanol. One possible source is: A.
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.
Why do alkanes have a higher heat of combustion than alcohols
However there are some areas of inaccuracy during the experiment that would have altered the readings: 1. Most of this energy is lost to the surrounding air. Results Record the results in a table. The aim is to find out how much energy is produced when burning the following alcohols : ethanol, propanol and butanol. Student questions Here are some possible questions to ask students. Which alcohol produces the most energy per gram? 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. Place the spirit burner underneath the can. Measure and record the mass of a spirit burner with its lid. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. 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. Dry off your hands and light the bunsen burner. 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.
Dry off your hands and light the bunsen burner. Alcohols can be used as a substitute for hydrocarbon fuels, and so methods of producing alcohols are very important. Pictures and information in suppliers' catalogues can be misleading.
Why does enthalpy of combustion of alcohols increase
Most of this energy is lost to the surrounding air. The burner is filled two-thirds of the way with the alcohol and the starting temperature is recorded. Conduction of heat from the tin can. Measure and record the mass of the spirit burner with its lid, and the maximum temperature of the water. The energy is used to heat the water to its boiling point and to vaporize it. Adjust the height of the can so that the lid of the burner can be removed and replaced safely. As the flame subsides, snuff it out with a quick jerk. It is important in this core practical to make and record a range of measurements accurately, including mass, temperature and volume. Does all the heat produced by combustion go into raising the temperature of the water? This may be because I either did not take enough care in obtaining these results, in terms of accurately reading off the thermometer etc. Repeat the experiment on a second towel but instead of using a mixture of water and alcohol, immerse the cloth in straight isopropanol. Complete combustion occurs when all of the bonds in a molecule are broken, releasing the maximum amount of energy.
Do not be surprised if groups get different answers for a given alcohol. 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 diagram illustrates the use of a calorimeter, a container especially designed for this purpose to obtain very accurate results, restricting heat loss from its shape and size.
Heat of combustion lab report
However there are some areas of inaccuracy during the experiment that would have altered the readings: 1. Throughout this investigation I am going to investigate to different factors that affect the breakdown of an alcohol Measure and record its temperature. Clearly then, most of the heat produced by the combustion of the alcohol is lost to the surrounding air but the energy required by the water processes are significant enough to keep the towel from burning. Therefore a case of incomplete combustion carbon monoxide is formed instead of carbon dioxide would occur and when new bonds are formed, this incompletion will result in the lessening of energy released from the reaction. This time the cloth will catch fire. I believe that I had conducted the experiment accurately, and recording enough results to provide a sound conclusion. Since it is a gas it can diffuse much easier than any other gasoline fuel. Other improvements could be made for a more efficient and accurate experiment, such as better equipment to obtain more accurate results.
If you cannot snuff out the flame with a quick jerk place the burning cloth into a third dry dish and cover it with a glass sheet. Other improvements could be made for a more efficient and accurate experiment, such as better equipment to obtain more accurate results.
Adjust the height of the can so that the lid of the burner can be removed and replaced safely.
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