1Use a molecular model kit to build a model to describe the attractive forces between these molecules. Evaporation and Intermolecular Attractions Leah Facun | Zoha Awan Chemistry 162 Section E 05/09/16 Purpose- The purpose of this lab is to understand the relationship between the strength of intermolecular forces of attraction to its temperature changes. (Be Sure To Show Nonbonding Electrons.) View desktop site, 1. drawn below is the plot of dT versus alcohol molar masses. molar mass Methanol : 32 ethanol : 4. We achieved this by measuring the temperature change during evaporation of 6 liquids where 4 were … decrease. Privacy Evaporation occurs when the probe is removed from the liquidÕs container. 1. 3 ac 01.1 9. Evaporation occurs when the probe is removed from the liquid's container. In Part A of the experiment, six different liquids were given, … The complete molecule goes from liquid to vapor state. The attraction of nonpolar molecules to other nonpolar molecules occurs through London dispersion (Van der Waals) forces. View desktop site, 2. First to process this data, each substance’s average temperature … Evaporation and Intermolecular Forces Data Table At (1-2) Substance (c) C) C) ethanol 1-propanol 24. l 19. q 4.3 1-butanol ly. Liquids with weak intermolecular attractive forces have low heats of vaporization and are volatile—they evaporate easily. Identification of intermolecular forces operating within liquid samples of water, ethanol, and acetone and the correlation of a physical property, rate of evaporation, … Predict which intermolecular forces exist between the particles of each liquid. Laboratory experiment: saltwater to salt chemistry experiment investigating evaporation lab 4 intermolecular forces lab: the metallurgy of hairpins and paperclips background: metals are a crystalline substance crystal structure introductory CHEM 1520L Experiment 001Testing polar, non-polar, and hydrogen bonding attractions within alkanes and alcohols 1 Answer. This evaporation is an endothermic process that results in a temperature decrease. strength of two intermolecular forces—hydrogen bonding and dispersion forces. & 3 C 10. Acetone has the weakest intermolecular forces, so it evaporated most quickly. C c acetone 94. Sara Hassan Chem 1310 - D06 Monday/2pm 09/02/2020 Experiment 14: INTERMOLECULAR FORCES LAB Evaporation and Intermolecular Attractions Objective: The objective of this laboratory experiment was to investigate the relationship of dispersion forces and hydrogen bonding forces in intermolecular attractions. Abstract: The objective of the experiment was to discover the relationship that intermolecular forces and rate of evaporation have and to relate intermolecular forces to molecular structure. They all depend on the fact that some parts of polar molecules have positive charges and other parts have negative charges. Ct,CHCHOH CH20H CHaCtCHCHOt H H -0-t ö-H h 1-CIC-C- --7-5-1 h HH H HH CHhCHoHCH CH3CH OH -H H Hー-フーラー 2. & 3. © 2003-2021 Chegg Inc. All rights reserved. Strong intermolecular attractions hold the molecules in a liquid more tightly. The purpose of this lab was to observe temperature changes caused by the evaporation of ethanol, 1- propanol, 1- butanol, n- pentane, methanol, and n- hexane, and then relate the temperature changes to the strength of intermolecular forces of attraction. Be sure to include a descriptive title and labeled axes. Experiment #6: Evaporation and intermolecular forces Evelyn Gearty Ellen, Kaitlyn 4 March 6, 2020. C c acetone 94. Question: Evaporation And Intermolecular Attractions Pre-Lab Exercise Name Mod Formula Structural Formula Molecular Weight Type Of Litermolecular Force Dpole H Н Dispo Dpole Bond Methanol (methyl Alcohol) CH, OH 32.042 Y Ethanol (ethyl Alcohol) CH,CH. Figure 1 MATERIALS computer methanol (methyl alcohol) Does your data agree with the expected result? The evaporation rate of each substance was needed to find which substance had the strongest and weakest intermolecular forces. (Be sure to show nonbonding electrons.) differences in INTERMOLECULAR FORCES that act between particles of these substances. As was the case for gaseous substances, the kinetic molecular theory may be used to explain the behavior of solids and liquids. The magnitude of a temperature decrease is, like viscosity and boiling temperature, related to the strength of intermolecular forces of attraction. Water had the strongest intermolecular forces and evaporated most slowly. Sample Calculations: For this lab, many calculations had to be made. 3 13. o ec II. 3 C 10. The rate of evaporation of a liquid depends on the nature of the liquid and the type of attractive forces between molecules. 9 "c IS c butanone 04.4 oc 19. I ec Post-Lab Graphing Exercises 1. Comment on the dependence between molar mass and the At values 3. 3 methanol 6, 8. The magnitude of a temperature decrease is related to the strength of intermolecular forces of attraction between molecules. Experiment: Evaporation and Intermolecular Attractions Purpose The purpose of this lab activity is to study temperature changes caused by the evaporation of several liquids and relate the temperature changes to the strength of the forces of attraction between molecules of the liquid. Explain 4. In order of decreasing strength, the important intermolecular forces in a compound are. Students work in groups to construct 3D molecular models. Evaporation and Intermolecular Forces In this experiment, temperature probes are placed in various liquids. © 2003-2021 Chegg Inc. All rights reserved. endothermic . 3. Classify liquids based on their rates of evaporation. Plot molar mass on the horizontal (x) axis and At on the vertical (y) axis. A. Intermolecular forces are strongest in 3-, Evaporation and Intermolecular Attractive Forces Complete the following data table, Compound Water AT ("C) Methanol Ethanol 1- Propanol 2- Propanol 1-Butanol Acetone Discussion: 1. This evaporation is an . This evaporation is an endothermic process that results in a temperature decrease. Privacy Briefly describe what occurs when a molečular liquid evaporates. Justify your reasoning. The magnitude of a temperature decrease is, like viscosity and boiling temperature, related to the strength of intermolecular forces of attraction. EXPT 2: Evaporation and Intermolecular Attraction Olga Clark 7/15/19 Abstract The goal of this experiment was to demonstrate relationship between intermolecular forces and evaporation rate of a liquid and show that the change of temperature decreases as the intermolecular forces increase. (a) In which compound does your data suggest that the intermolecular attractive forces are the strongest? Terms (a) methanol, ethanol, 1-propanol, and 1-butanol (b) acetone and 2-propanol (c) 1-propanol and 2-propanol (d) water and methanol. Based on the At values you obtained from ethanol and 1-propanol, use Excel to create a second graph of molar mass y). Background: Evaporation is the process where a liquid solution changes into the gaseous state. Excel to plot a graph of At values of the four alcohols versus their respective molar masses. 3 methanol 6, 8. Evaporation occurs when the probe is removed from the liquid's container (see figure 1). Terms Make sure your graph has a descriptive title and that your axes are labeled with 2. Use your experimental AT values to answer the following questions. This evaporation is an endothermic process that results in a temperature decrease. The strength of the intermolecular forces in isopropyl alcohol are in between water and acetone, but probably closer to acetone because the water took much longer to evaporate. The rate of the temperature decrease is, like viscosity and boiling Lab 1 Evaporation rate Ken O’Rourke Chem 512 ... strongest type of intermolecular force, will be the hardest to overcome to escape into the ... Molar mass seems to have an effect on evaporation rates in that the larger a molecule gets or grows from a base chemical formula, its evaporation … Through the process of the experiment it was found that the stronger the intermolecular force, the higher the rate of evaporation and that intermolecular forces … Next, students use a thermometer to measure the temperature change during evaporation. Draw A Lewis Structure For Each Of The Molecules Used In This Experiment. Relate the temperature changes to the strength of intermolecular forces of attraction. and connect the models by rubber bands representing an intermolecular force. In this investigation, students test evaporation rates for different liquids. This evaporation is an endothermic process that results in a temperature decrease. As those forces get stronger, evaporation becomes a slower process. 3. The evaporation of a volatile liquid from the surface of a Temperature Probe is an endothermic process that results in a temperature decrease. | Name Sophie Moore Period 2 Date 4/11/18 Honors Chemistry Lab: Evaporation and Intermolecular Attraction Purpose: To investigate the strength of intermolecular forces in related alkanes and alcohols. Are any bonds within a molecule broken? For each of the following sets of compounds, expiain the variation in the AT values in terms of the specific intermolecular attractive forces present and their strength, In your answer, you must identify the Intermolecular attractive force primarily responsible for the observed trend in the AT values and how the strenath of that attractive force varies among the compounds in that particular set. Purpose of Lab/Activity: Measure and compare the rates of evaporation for different liquids. 3 13. o ec II. Intermolecular Forces and the Evaporation of Liquids Experiment 9 * 1 Cindy Nguyen CHEM 117-509 Tyler Nardecchia Summary: The purpose of this experiment was to determine how the strength of intermolecular forces varied based on how quickly certain liquids evaporated and how much the temperature changed during evaporation. Fit a line to the two data points and show the equation of that line on your graph. process that results in a temperature . But within the same molecule, no bonds are broken. Does your data agree with the expected result? The larger the intermolecular forces in a compound, the slower its evaporation rate. Solutions can evaporate at any given temperature and evaporation … The magnitude of a temperature decrease is, like viscosity and boiling temperature, related to the strength of intermolecular forces … I ec Post-Lab Graphing Exercises 1. 3 ac 01.1 9. Have very weak intermolecular ... During evaporation, since the higher energy molecules from the liquid are leaving, the total kinetic energy of the liquid decreases, and the liquid cools . Evaporation and Intermolecular Forces Data Table At (1-2) Substance (c) C) C) ethanol 1-propanol 24. l 19. q 4.3 1-butanol ly. Ease of evaporation (like liquid viscosity and boiling point temperature) gives us insight into the forces of intermolecular attraction. Evaporation occurs when the probe is removed from the liquid's container. The magnitude of a temperature decrease is, like viscosity and boiling temperature, related to the strength of intermolecular forces … 9 "c IS c butanone 04.4 oc 19. Is this a direct or inverse relationship? In the following description, the term particle will be used to refer to an atom, molecule, or ion. OBJECTIVES In this experiment, you will Study temperature changes caused by the evaporation of several liquids. | Evaporation occurs when the probe is removed from the liquid’s container (see figure 1). Draw a Lewis structure for each of the molecules used in this experiment. This experiment is performed to understand intermolecular forces by studying several molecules’ weight and structure and how it may affect … The intermolecular forces start breaking. Explain (b) In which compound does your data suggest that the intermolecular attractive forces are the weakest? Chemistry Laboratory Report Evaporation. Evaporation occurs when the probe is removed from the liquid's container (see figure 1). Discussion In this experiment, temperature probes covered with filter paper are placed in various liquids. Question: Evaporation And Intermolecular Attractive Forces Complete The Following Data Table, Compound Water AT ("C) Methanol Ethanol 1- Propanol 2- Propanol 1-Butanol Acetone Discussion: 1. 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