Lab 15: Evaporation and Intermolecular Attractions
Pre-Lab:
Data Table:
Analysis Questions:
Explain the differences in the difference in temperature of these substances as they evaporated. Explain your results in terms of intermolecular force.
With the exception of glycerin, all of the final temperatures were less in value than the initial temperatures of their respective substances. Some substances, like methanol, had weaker intermolecular forces, which resulted in higher volatility and a larger decrease in temperature. Contrastingly, glycerin's temperature increased through out the four minutes due to its three extremely strong OH bonds.
Explain the difference in evaporation of any two compounds that have similar molar masses. Explain your results in terms of intermolecular forces.
Methanol and ethanol are two compounds that have similar molar masses, 32.04 g/mol and 46.08 g/mol, but methanol decreased four more degrees celsius than ethanol did. This is because methanol's intermolecular forces are weaker than ethanol, so methanol evaporates quicker.
Explain how the number of OH groups in the substances tested affects the ability of the tests compounds to evaporate. Explain your results in terms of intermolecular.
As the number of OH groups in the substances increased, the compounds were less volatile. This corresponds with the data because methanol, which had the least number of OH groups, had a larger difference in temperature than a substance like glycerin, which had three OH groups. These substances are less volatile because they more chances to have intermolecular hydrogen bonds, thus increasing its intermolecular force, which ultimately means a higher ability to evaporate.
Data Table:
Analysis Questions:
Explain the differences in the difference in temperature of these substances as they evaporated. Explain your results in terms of intermolecular force.
With the exception of glycerin, all of the final temperatures were less in value than the initial temperatures of their respective substances. Some substances, like methanol, had weaker intermolecular forces, which resulted in higher volatility and a larger decrease in temperature. Contrastingly, glycerin's temperature increased through out the four minutes due to its three extremely strong OH bonds.
Explain the difference in evaporation of any two compounds that have similar molar masses. Explain your results in terms of intermolecular forces.
Methanol and ethanol are two compounds that have similar molar masses, 32.04 g/mol and 46.08 g/mol, but methanol decreased four more degrees celsius than ethanol did. This is because methanol's intermolecular forces are weaker than ethanol, so methanol evaporates quicker.
Explain how the number of OH groups in the substances tested affects the ability of the tests compounds to evaporate. Explain your results in terms of intermolecular.
As the number of OH groups in the substances increased, the compounds were less volatile. This corresponds with the data because methanol, which had the least number of OH groups, had a larger difference in temperature than a substance like glycerin, which had three OH groups. These substances are less volatile because they more chances to have intermolecular hydrogen bonds, thus increasing its intermolecular force, which ultimately means a higher ability to evaporate.
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