Memo
Chemistry II lab
Why do liquids evaporate at different rates?
Section1:
Have you ever left a container with some type of liquid in it and wondered how it could it evaporate so quickly? The evaporation of an unpredictable liquid is an endothermic process that results in a temperature decrease. The amount of temperature decrease is related to the strength of intermolecular forces of attraction. The rate of evaporation can be described as the change of temperature divided by the time it takes to reach the lowest temperature. ΔT/Δt (°C/s). In this experiment my group and I are investigating factors that determine the strength of intermolecular forces by determining the rate at which liquids evaporate. The different types of intermolecular forces are as follows, Ion dipole are the strongest forces, Dipole Dipole which are between polar molecules and both positive and negative ions attract to each other, dispersion are the weakest of all intermolecular forces, they also are formed by the shifting of electron clouds within molecules and hydrogen bonding which is attractive force between the hydrogen attached to an electronegative atom of one molecule and an electronegative atom
Section2:
To begin this experiment we were given a Molecular Model kit to determine the shapes, whether they are polar or nonpolar, as well as which molecule has the strongest intermolecular forces. We then determine that either Butanol or Pentane would evaporate the quickest because they were similar in structure but they differed due to Butanol having five carbon molecules and also an oxygen molecule where Pentane has only four carbons and no oxygen molecules. Meaning Butanol has more hydrogen bonding to break apart. The next week, we then were given seven different types of substance to start this experiment. Once we had gathered all of this information we then began to test our claim. Which we thought that pentane would evaporate the fastest. My group members wrapped the
Why do liquids evaporate at different rates?
Section1:
Have you ever left a container with some type of liquid in it and wondered how it could it evaporate so quickly? The evaporation of an unpredictable liquid is an endothermic process that results in a temperature decrease. The amount of temperature decrease is related to the strength of intermolecular forces of attraction. The rate of evaporation can be described as the change of temperature divided by the time it takes to reach the lowest temperature. ΔT/Δt (°C/s). In this experiment my group and I are investigating factors that determine the strength of intermolecular forces by determining the rate at which liquids evaporate. The different types of intermolecular forces are as follows, Ion dipole are the strongest forces, Dipole Dipole which are between polar molecules and both positive and negative ions attract to each other, dispersion are the weakest of all intermolecular forces, they also are formed by the shifting of electron clouds within molecules and hydrogen bonding which is attractive force between the hydrogen attached to an electronegative atom of one molecule and an electronegative atom
Section2:
To begin this experiment we were given a Molecular Model kit to determine the shapes, whether they are polar or nonpolar, as well as which molecule has the strongest intermolecular forces. We then determine that either Butanol or Pentane would evaporate the quickest because they were similar in structure but they differed due to Butanol having five carbon molecules and also an oxygen molecule where Pentane has only four carbons and no oxygen molecules. Meaning Butanol has more hydrogen bonding to break apart. The next week, we then were given seven different types of substance to start this experiment. Once we had gathered all of this information we then began to test our claim. Which we thought that pentane would evaporate the fastest. My group members wrapped the