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CHEMISTRY Intermolecular Forces

CHEMISTRY Intermolecular Forces - T emperature Change(C...

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Temperature Change (C) William Pittman Chemistry - 107 10 – 31 - 07 Intermolecular Forces & The Evaporation of Liquids Summary: In this experiment, we observed the temperature changes as liquids evaporated. To observe this we soaked Filter paper cut into squares in different substances, wrapped the paper around a temperature probe and then let the substance evaporate into the air. When the substance evaporated, the temperature dropped, suggesting an endothermic reaction. In the second half of the experiment we observed the vapor pressure of two liquids as a function of temperature by putting them in a closed container and increasing the temperature around the container, and observing the pressure changes. Discussion: N-pentane & 1 – butanol vary in their changes in temperature because of the presence of hydrogen bonds in 1 – butanol, because the hydrogen bonds absorb the energy resulting in less energy change. The alcohol with the strongest intermolecular forces of attraction
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