BC Chemistry 162 Laboratory Manual Name_____ Section_____ PROCEDURE (READ BEFORE … Q5) Evaporation and intermolecular forces have direct relation, stronger intermolecular forces cause evaporation rate to be slower. water vapor).It is the opposite of condensation.Generally, evaporation can be seen by the gradual disappearance of a liquid when exposed to a significant volume of gas. More than one of the statements given described a correct effect. 0000010502 00000 n 0000006352 00000 n For reference, two of the chemicals were ethanol with hydrogen bonding and n-pentane with only London dispersion forces. x�b```b``]������� Ȁ �@16�`���SǸ"78,P|���R��������Π�� m�N��L6M�hc(b�Yܛ�ʑ��`��$����8�d���b2 R@nlŢ�G��0�r)�< Ь������@)��F\� )��W��S� ���h����t�0���et����p����llb0C�}��+ii V��10$0Z2�0�d�b�ˠ ;�$ʐŰ��&c*�[��Lߘ����0�Z��! intermolecular forces—hydrogen bonding and dispersion forces. 0000004951 00000 n Evaporation is an endothermic process, meaning that energy is absorbed by the liquid in order to turn molecules in the liquid phase into the gas phase. 0000001378 00000 n endstream endobj 1326 0 obj<>/OCGs[1328 0 R]>>/PieceInfo<>>>/LastModified(D:20051117132050)/MarkInfo<>>> endobj 1328 0 obj<>/PageElement<>>>>> endobj 1329 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>/Properties<>>>/StructParents 0>> endobj 1330 0 obj<> endobj 1331 0 obj<> endobj 1332 0 obj<> endobj 1333 0 obj<> endobj 1334 0 obj<> endobj 1335 0 obj<> endobj 1336 0 obj<> endobj 1337 0 obj<>stream taking in heat from the surroundings. 0000001896 00000 n endstream endobj 1355 0 obj<>/W[1 1 1]/Type/XRef/Index[61 1264]>>stream Evaporation is an endothermic process, and the magnitude of the temperature decrease during evaporation is an indication of the strength of the intermolecular forces present. Duration: 6M 54S . ]°����C�q'C,�G����T�����402����3p�0X�6��" ����\�` �df The chemicals with stronger intermolecular forces had a lower drop in temperature (from room temperature to final, after most of the alcohol had evaporated off). 0000003582 00000 n Evaporation and Intermolecular Attractions OBJECTIVES • Identify the intermolecular forces inherent in volatile liquids using the ball-and-stick model of their molecules. Lennard-Jones 12-6 potential is used to determine the intermolecular forces. In this experiment, you will investigate factors that determine strengths of intermolecular forces of attraction … 0000005174 00000 n Other factors being equal, the higher the rate at which molecules leave the liquid surface, the more extreme the temperature drop. trailer Students often believe the molecular mass of a compound is the major factor governing physical properties, such as boiling point and evaporation. 0000006635 00000 n To understand that the relationship between pressure, enthalpy of vaporization, and temperature is given by the Clausius-Clapeyron equation. Chaylen Andolino Partner: Bethany Rudolph Make-up Lab Date: 5/25/2012 Evaporation and Intermolecular Attractions Lab Purpose: 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. The magnitude of a temperature decrease is, like viscosity and boiling temperature, related to the strength of intermolecular forces of attraction. The molecules are bonded together tighter and therefore needs more energy to break up the bond and increase molecular motion. and boiling temperature, related to the strength of intermolecular forces of attraction. You will use the results to predict, and then measure, the temperature change for several other liquids. In this experiment, you will • Study temperature changes caused by the evaporation of several liquids. 0000003446 00000 n 1. This can cause a measurable temperature decrease in the surroundings. 0000004220 00000 n This demo is probably best used when discussing intermolecular forces. Polar molecules add another kind of force, beyond their London forces, and so have stronger overall intermolecular forces of attraction. 0000078938 00000 n 0000000937 00000 n As those forces get stronger, evaporation becomes a slower process. Plus ces interactions sont fortes et nombreuses, plus la Presenter: Melissa Hill, Ph.D. Nova Southeastern University. Introduction. The purpose of this lab was to observe temperature changes caused by the evaporation of ethanol, 1 The uncertainty for the temperature probes was . ÜiÁj:4q¶¿U¬ÎÜ0{" ¬?⊻ªƒ“ªÆ¶¢áõGœq§ÒÉîuܱª. 0000011214 00000 n If the temperature is increased, the proportion of molecules with enough kinetic energy to overcome intermolecular forces in the liquid increases. Purpose. H���_o�0���)�#H�k�qpU��iR�봰�T����RH ��ߵ��d�6iI��s��c'w�E2Y��ar� ��.���[`p}}s��n��E�0|�l'SJ(��S����ڟY "�3)cH^&����b�,�.V��'?� �̃ﴫB��^YRB��SZ�+Jg�5*"WЯ \ �e�L. �#V��t~=laN��0���`���?��X<5F�'j5��/:}�z5`�uD�׾X���'����K���@� �@�۫l9�x�rb*u���%�~9� V����I!���ΙЄ1PM�a"��㍿y��%�**�w^�/�������]�ƈc�d��P þ¶*èoÇãFÔCûѪàXk—Ò®Sڏ)m-´ø¿Ú1³Êߊ'ú«[6ÎÜP=± In this situation, the air above the liquid surface is saturated with molecules that have been evaporated. <<0427ce02f732c547aeee547d2bf040c5>]>> saveSave Evaporation and Intermolecular Attractions Lab For Later. Share. This evaporation … Please sign in or register to post comments. Température d’ébullition Pour passer de l’état liquide à l’état gazeux, il faut casser les interactions intermoléculaires. 0000003973 00000 n 0000003927 00000 n 1. Below are just my initial attempts to understand. Relate the temperature changes to the strength of intermolecular forces of attraction. In this experiment, temperature probes covered with filter paper are placed in various liquids. Figure 1 Background . 0000002397 00000 n 0000003849 00000 n Relate the temperature changes to the strength of intermolecular forces of attraction. Evaporation is the process by which molecule s in a liquid state (e.g. Les forces intermoléculaires sont responsables des propriétés de la matière dans sa masse: points de fusion, d'ébullition. INTERMOLECULAR FORCES. If a molecule is capable of hydrogen bonding, then it has all three kinds of intermolecular forces and has the strongest overall mix. Study temperature changes caused by the evaporation of several liquids. 1. 0000002991 00000 n Related Activities University. ¦;4HÙ½¨Âˆ#5¸ ˜´r¦NôŽêVW°ªºÕ¬R®1¡êIS[‡¨¯®Jƍ¬‡5²{Í¢p¢G4SƒSi£ÉikÒÝõ­Ì¤±­d"Ë˜ÕjVµÚ—ç¸Ù½ÞªÞØãb+ œ4mÃ@@Á#µ©îDڛ´zCFùaZ²fl}+^Ó …qvU Two liquids n-pentane (C 5 H 12) and 1-butanol (C 4 H 9 OH) have nearly the same molecular weights but different change in temperature values. 0000007424 00000 n MATERIALS . Share . 0000000016 00000 n 0000052861 00000 n Evaporation and Intermolecular Attractions continued of evaporation of a liquid increases at higher temperatures, because more molecules have enough energy to break free of the liquid’s surface. The act of turning a liquid … Students also viewed. A small drop in temperature i.e. Does it have anything to do with n-pentane not having a hydrogen bond … Details of the simulation are presented as well as variations in properties obtained from the simulation. My question is why. 2016/2017. Comparisons of the simulation results to Name Anastasia Bui _____ Date _____ Lab 6: Evaporation and Intermolecular Attractions Purpose: Examine the molecular structure of alkanes and alcohols for the presence and relative strength of two intermolecular forces, hydrogen bonding and dispersion forces. Dry Lab 2b - Chem 1310 2B dry lab Experiment 5 lab report Experiment 18 Experiment 22 - The … strength of two intermolecular forces—hydrogen bonding and dispersion forces. OBJECTIVES In this experiment, you will Study temperature changes caused by the evaporation of several liquids. This happens due to the fact that intermolecular forces will hold the molecules together and prevent them from evaporating. 0000078517 00000 n H��T�n�0��+�TH��M�� �"��p�^�I]4�!�M[��R�6�DrIif���Ҭnv�妁�s��@��n_6�jt2�~�J�0��1JZ ��V`�$�3�šfMSn>o�`E}u�����2���s���A�b�q��������G�{�=~��� �Gଝ�[5.�S�21I�`9��H���������8��t��p�0z��)[̗�� Course. 0000008228 00000 n Helpful? Evaporation occurs when the probe is removed from the liquid’s container (see figure 1). 0000004799 00000 n temperature and strength of intermolecular attractions If a liquid is heated its molecules will move around faster and will have more energy. slow rate of evaporation is an indication of strong intermolecular forces. endstream endobj 1338 0 obj<> endobj 1339 0 obj<> endobj 1340 0 obj<>stream xref As those forces get stronger, … Three factors control the rate of evaporation of a liquid: surface area, temperature, and strengths of intermolecular forces. needhelp Mon, 02/25/2008 - 16:24. 1325 0 obj <> endobj In this experiment, our Chemistry Staff Scientist, Melissa Hill, PhD, studies temperature changes caused by the evaporation of two alcohols and relates the temperature changes to the strength of intermolecular forces of attraction. 0 Learning Objectives. This graph represent the relationship between temperature and intermolecular force. 0000071443 00000 n Relate the temperature changes to the strength of intermolecular forces of attraction. 0000009724 00000 n OBJECTIVES . Comments. x���1 0ð4t�y\w�C&`�'MF[����!��= ^�Y 0000005949 00000 n 0000002038 00000 n Intermolecular forces ... therefore boil at higher temperature. 23 25. The rate of the temperature decrease is, like viscosity and boiling temperature, related to the strength of intermolecular forces of attraction. The magnitude of a temperature decrease is, like viscosity and boiling temperature, related to the strength of intermolecular forces of attraction. 0000009043 00000 n In today’s lab exercise, you will work with two types of organic liquids–normal alkanes … 1325 31 1327 0 obj<>stream Ease of evaporation (like liquid viscosity and boiling point temperature) gives us insight into the forces of intermolecular attraction. strength of two intermolecular forces—hydrogen bonding and dispersion forces. Your results are correct, during evaporation there is a small period when the temperature doesn't change, this is becouse the energy being supplied is being used to break the intermolecular forces and not increase the temperature. water) spontaneously become gas eous (e.g. %%EOF Evaporation occurs when the probe is removed from the liquid's container. General Chemistry I/Lab (CHEM 1300) Academic year. OBJECTIVES In this experiment, you will Study temperature changes caused by the evaporation of several liquids. In this experiment, you will study temperature changes caused by the evaporation of several liquids and relate the temperature changes to the strength of intermolecular forces of attraction. Evaporation and Intermolecular Attractions. Q6) The temperature drop will be 3.9 degrees centigrade. The rate of evaporation of a liquid depends on the nature of the liquid and the type of attractive forces between molecules. Download Now Evaporation and intermolecular attractions lab report answers. 0000078750 00000 n evaporation and intermolecular forces. We believe that, when doing the experiment, the substances with stronger intermoleculas forces (hydrogen bonds) will evaporate slower, or, in other words, their change in temperature is lower and therefore, it will take more time to reach the temperature it needs to evaporate. The evaporation of a volatile liquid from the surface of a Temperature Probe is an endothermic process that results in a temperature decrease. Parameters such as the bulk liquid density, vapour density, vapour pressure, surface tension, and interfacial surface thickness with respect to temperature are determined. • Relate the temperature changes to the strength of intermolecular forces of attraction. %PDF-1.4 %���� • Study temperature changes caused by the evaporation of several volatile liquids. This evaporation is an endothermic process that results in a temperature decrease. Figure 1 . �X�lX|��_�b�������|z��SW|�����=�'h��I����jO�h�Vq���o�T&g"�t��E��5�` �JT The temperature change is greater if more evaporation occurs (weaker intermolecular forces). Explain the difference in delta T values of these substances based on their intermolecular forces. Evaporation and Intermolecular Forces. Ease of evaporation (like liquid viscosity and boiling point temperature) gives us insight into the forces of intermolecular attraction. Investigate the relationship of dispersion forces and hydrogen bonding forces in intermolecular attractions. In this experiment, you will study temperature changes caused by the evaporation of several liquids and relate the temperature changes to the strength of intermolecular forces of attraction. Intermolecular Forces with Evaporation of Alcohols Using Go Direct® Temperature. startxref To understand that the equilibrium vapor pressure of a liquid depends on the temperature and the intermolecular forces present. Intermolecular Forces Evaporation and Intermolecular Attractions Lab report. 0000001585 00000 n To analyze the connection between evaporation and intermolecular forces Introduction: In this experiment, you will be measuring the change in temperature of a liquid during the process of evaporation. 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