Rate of Evaporation- Research Paper

1744 Words Dec 6th, 2012 7 Pages
Internal Assessment: Rate of Evaporation
Ann George
Mr. Frias/4th Period
Wheeler High School

Research Question
How will changing the molar mass of alcohol affect the rate of evaporation, represented by the change in temperature over time, measured using a temperature probe?
Alcohol is an organic compound in which the hydroxyl functional group, OH, is bound to a carbon atom. Its carbon center should be saturated; it should have single bonds to three other atoms. The different types of alcohols are determined by the kinds of CH2 groups while the number of CH2 groups there are tells you the volume of the alcohol. The acyclic alcohols are the most basic and one of the most important groups of alcohol. The general formula of
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Denser objects take longer to evaporate as well. The pressure of an object also effects evaporation since evaporation happens faster if there is less exertion on the surface keeping the molecules from launching themselves. The formula to determine the evaporation rate of a substance is as follows.
Change in Temperature
Change in Time
Rate of Evaporation=

In measuring the evaporation rate of a liquid, a temperature probe is most commonly used to calculate the decrease in temperature. If the evaporation rate occurs quickly, the temperature will also decrease quickly.
For determine the rate of evaporation of a substance, the change in temperature is divided by the change in time. Among the five previously mentioned alcohols, methanol, ethanol, propan-2-ol, butan-1-ol, and pentan-1-ol, the rate of evaporation for the methanol will be faster. Methanol will evaporate more quickly because its intermolecular forces are the smallest since it has the lowest relative molecular mass. This shows that the molecules in methanol can easily evaporate. The butan-1-ol will evaporate the slowest because it has the highest molecular mass of all the alcohols given, so it therefore has the greatest intermolecular force of attraction. If the molecules’ properties are the same, then the intermolecular forces of attraction are proportional to the relative molecular mass. So as the

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