Cullen Enrico Evan G4 PPT
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This document summarizes an experiment that investigated how the concentration of ethanol affects the duration of its combustion. The independent variable was the concentration of ethanol and the dependent variable was the combustion duration. The experiment found that as the concentration and volume of ethanol increased, the combustion time also increased. The combustion time of Chinese liquor was longer than ethanol solutions. Combustion occurred at concentrations higher than 42% alcohol by volume under room temperature and pressure conditions.
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Cullen Enrico Evan G4 PPT
- 1. Combustion of Varying Concentrations of Ethanol Cullen Chen, Enrico Baculinao, Evan Ramsey
- 2. Research Q and Variables How does the concentration of ethanol affect the duration(seconds) of its combustion and how does this trend compare to the combustion duration of equal-proof Chinese liquor? IV: Concentration of Ethanol (Alcohol) DV: Combustion Duration
- 4. Raw Data Qualitative Data
- 6. Conclusion and Evaluation Conc. ↑: Vol. ↑: Combustion Time ↑ Comb. Time: ErGuoTou> Ethanol Solution Combustion: > 42%abv (Room T&P)
Notes de l'éditeur
- 10mL of different concentrations of ethanol are put into watch glasses at room temperature. The ethanol is then lit with a match and its duration of combustion is recorded. The different concentrations of ethanol are achieved by using specific amounts of distilled water to dilute the solution to the desired concentration. We started out with 95% lab ethanol and diluted it down with distilled water to 90%, 75%, 60%, 45%, 40%, and 30%. We also used 56% ErGuoTou, a Chinese liquor derived from sorghum, and tested 56%, 50% and 45%, as well as a 42% Chinese liquor. Each percentage of alcohol was tested three times in order to ensure accuracy. As for the reaction itself, tthanol and oxygen enter a chemical reaction with the help of a tiny bit of energy, which in this case is the fire from the match. The reaction results in a significant release of energy in the form of heat and light, as well as the formation of carbon dioxide and water.
- -Present Data-Discuss Outliers
- As concentration of ethanol increases, the duration of combustion increases. The increase in concentration means an increase in volume of ethanol, therefore, the result is a longer combustion reaction although the combustion itself occurs at the same rate.Our results indicate ErGuoTou has a longer duration of its combustion reaction at the same level of alcohol content. As the graph indicates, the gradient of the linear fit of the data on ErGuoTou is both steeper, and of greater duration than the linear fit for ethanol. This suggests the the combustion of ErGuoTou has a slower reaction rate than of Ethanol. It can be concluded that the extra ingredients used to flavor ErGuoTou contribute to the slowing down of the reaction.The results also show how concentrated the ethanol must be in order to become flammable. Based on our data, the threshold for a combustible concentration of ethanol is between 42 and 45%abv at room temperature and standard pressure. This could be a factor in the majority of distilled spirits being of 40%abv in order for it not to be flammable, for both safety in consumption and production. As ethanol did not ignite at 42%abv and below, the linear fit is only valid in the domain (42, 100] %abv.
- As concentration of ethanol increases, the duration of combustion increases, due to a higher volume of ethanol.ErGuoTou has a longer duration of its combustion reaction because it has a different composition which affects the reactionThe size of the watch glass size was problematic in that as they were of different sizes, the surface area of the 9.5 mL of solution used varied. Watch glasses of the same sizes would be preferred.In our first set-up, we made an error in not accounting for the evaporation of the ethanol solution. Because of this, we had to redo our first set of results creating solutions one at a time.The graduated cylinders we used to measure water and ethanol respectively could not be cleaned thoroughly between measurements. This may have affected the volume measurements, and as a result, the abv of the solutions.