Chem 222 Lab 5 Report
Experiment Completed on Tuesday, October 21, 2014
Report turned in on Tuesday, November 3, 2014
Author: Katyna Omidfar-Tran
Partner: Jesus Palomo
Data Analysis Questions
1. Molecular Series I, II, and III all have London Dispersion forces, Dipole-Dipole moment forces, and Hydrogen Bonding forces.
2. Molecular Series IV all have London Dispersion forces only
3. In Molecular Series I (Straight-Chain Alcohols): As you go through the group from methanol ethanol 1-propanol 1-butanol:
A. The IMFs that are changing in Molecular Series I are London Dispersion forces.
B. Claim: As we go from methanol ethanol 1-propanol 1-butanol the dispersion forces increase. …show more content…
D. Hypothesis: I propose that the reasons the IMFs (specifically hydrogen bonding) decrease from 1-butanol sec-butanol 1-ter-butanol are that a decrease in the surface area and decrease in dipole moment in the molecule decrease the strength of the hydrogen bond IMFs.
An increasingly negative ΔT is a reflection of the weakening dispersion forces because in a sample of molecules, a weaker IMF (dispersion forces) will require a lower kinetic energy for the molecule to break free of the liquid and become part of the vapor. The more molecules that are able to escape into the vapor, the greater the decrease in temperature due to evaporative cooling. Thus, a larger negative ΔT corresponds to a substance in which the IMFs