Rubenstein_Exp11

Rubenstein_Exp11 - Experiment 11 Intermolecular Forces...

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Experiment 11 – Intermolecular Forces Spring 2010 Name Alec Rubenstein Lab Section 438 Point Summary (See Blackboard for detailed grading rubric) Superior Excellent Satisfactory Fair Poor Omitted Introduction •Purpose of Report •Goals of Experiment Materials and Methods Results and Discussion •Description of data •Data Tables •Data Table Titles •Graphs •Figure Captions •Sample Calculations •Systematic Error •Random Error •Discussion of discrepancies Other Lab Technique TOTAL POINTS TA Comments/Suggestions:
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C HEMISTRY 102L R EPORT T EMPLATE EXPT. Evaporation and Intermolecular Forces 11 11 Introduction The purpose of this report is to explore the relationship between a substance’s molecular structure, intermolecular forces, and its heat of vaporization . The objective of the experiment was to understand how heats of vaporization vary with the strength of the intermolecular forces present in various solvents and to relate enthalpy of vaporization to intermolecular forces and structural formula . Materials and Methods The procedure for this experiment was taken from UNC Chemistry 102 Lab Manual, Experiment 11: Evaporation and Intermolecular Forces, Spring Semester. No deviations were taken from the given procedure. Results and Discussion In this experiment, data was collected by dipping the temperature sensor in a sample of each of the solutions and collecting the temperature change of the sensor during the substance’s vaporization over time. The graphs in Figures 1, 2, & 3 show the relationship between temperature (Kelvin) and time (seconds) for alkanes, straight-chain alcohols, and butanol isomers. Figure 1. Graphical Analysis of Temperature (K) vs. Time(s) for the evaporation of the Alkanes: Heptane, Octane, & Nonane.
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Figure 2. Graphical Analysis of Temperature (K) vs. Time(s) for the evaporation of the Alcohols: Methanol, 1-Propanol & Ethanol. Figure 3. Graphical Analysis of Temperature (K) vs. Time(s) for the evaporation of the Butanol Isomers: 1-Butanol, Tert-Butanol, & Sec-Butanol.
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The Clausius-Clapeyron equation is a mathematical formula for the relationship between vapor pressure and temperature of a substance. The equation is C RT H P vap + - = ln where P is the vapor pressure, T is the absolute temperature in Kelvin, R is the gas constant (8.314 J/mol-K), C is a constant, and vap H is the enthalpy of vaporization per mole of the substance. This equation is related to this experiment because it estimates that a graph of
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Rubenstein_Exp11 - Experiment 11 Intermolecular Forces...

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