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<h2 class="hd hd-2 unit-title">Reference Summary</h2>
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<h3> <b> Ionic Bond </b> </h3>
<p> An ionic bond is an electrostatic interaction between oppositely charged ions (atoms that have lost/gained 1 or more electrons). <br /> <b><em>Strong interaction</em></b> </p>
<img src='/assets/courseware/v1/a7dcb6a62bf1c41df0226fc6ad6d8abd/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/c1.png' alt="This image is of acetate CC(=O)[O-] and of a sodium ion [Na+]. The sodium ion is positioned next to the negatively-charged O atom of the acetate. The negatively charged oxygen and the positively charged sodium are circled to indicate that they interact via an ionic bond.">
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<h3> <b> Covalent Bond </b> </h3>
<p> A covalent bond consists of one or more pairs of electrons are shared by two atoms. <br /> <b><em>Strong interaction</em></b> </p>
<img src='/assets/courseware/v1/543e53c766623394cfe754f536b3f825/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/c2.png' alt="This image is of acetate CC(=O)[O-] and of a sodium ion [Na+]. The sodium ion is positioned next to the negatively-charged O atom of the acetate. Double bond between the central carbon and the neutral charge oxygen is circled to indicate that the interaction is a type of covalent bond.">
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<h3> <b> Hydrogen Bond </b> </h3>
<p> A hydrogen bond forms between polar molecules where an H has a partial positive charge (induced by an electronegative atom) and is therefore attracted to a different electronegative atom. <br /> <b><em>Medium-strong interaction</em></b> </p>
<img src='/assets/courseware/v1/7f42cf5e2d381db09cc52e2e95b42bf0/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/c3.png' alt="This image is of adenine C1=NC2=NC=NC(=C2N1)N and thymine CC1=CNC(=O)NC1=O. One of the hydrogens from adenine's amine group is aligned with an oxygens of one thymine's adehyde groups. There is a dashed line between the H and the O. This dashed line is circled to indicate that the interaction is a hydrogen bond. That H atom is also labelled with a delta plus symbol. The N of that amine group and the O atom are both labelled with delta minus symbols. Additionally, there is a dashed line between the H atom of thymine's amine group and one of the N atoms of the six-membered adenine ring. This dashed line is also circled to indicate that the interaction is a hydrogen bond. This H atom is also labelled with a delta plus symbol. The N atom that the H atom forms a H bond with and the N atom from the amine group are labelled delta minus symbols.">
<br /> <br /> <br /> <br />
<h3> <b> Non-polar/van der Waals Bond </b> </h3>
<p> This type of bond is between nonpolar molecules, with transient unequal charge distribution (dipoles). <br /> <b><em>Weak interaction</em></b> </p>
<img src='/assets/courseware/v1/38995598726a74883b7d6d7f4d58416f/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/c4.png' alt="This image is of two molecules of pentane CCCCC. There is a dashed oval encompassing part of each molecule. The oval is labelled with a delta plus symbol at one end and a delta minus symbol at the other end. The oval indicates that transient van der Waals interactions are forming between the atoms of the two molecules.">
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<h2 class="hd hd-2 unit-title">Exercise 1 (Ethanol)</h2>
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<p> <b> Ethanol </b>(single molecule shown above) can form interactions with other ethanol molecules as shown below. <br /></p>
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Ethanol: Bond types
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<p>In the image above, identify the bond in the red circle labeled 1. <br/>Select the best answer.</p>
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<p>Identify the bond in the red circle labeled 2.<br/>Select the best answer.</p>
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<h2 class="hd hd-2 unit-title">Exercise 2 (Amino Acids)</h2>
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<h3 class="hd hd-3 problem-header" id="d64ee4a2557248759f93ee883ef4ea73-problem-title" aria-describedby="block-v1:OCW+Pre-7.01+1T2020+type@problem+block@d64ee4a2557248759f93ee883ef4ea73-problem-progress" tabindex="-1">
Amino Acids: Bond Identification
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<p>The interactions between some individual amino acid molecules are shown below. The interactions are outlined in red boxes and labeled by number.</p>
<p><img src="/assets/courseware/v1/4bdc91e1f0fd96085677a7e30e4ee3cd/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/1.3_exercise_2.png" width="600" style="float: center;" alt="Three amino acids oriented so that two intermolecular bonds are present. Amino acid asparagine (Asp) is in the top left, forming an intermolecular bond with amino acid serine (Ser) in the top right, which in turn forms an intermolecular bond with a second asparagine (Asp) in the bottom right."/></p>
<p>Which interaction is shown within the box labeled 1? Select the best answer.</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_d64ee4a2557248759f93ee883ef4ea73_2_1">
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<input type="radio" name="input_d64ee4a2557248759f93ee883ef4ea73_2_1" id="input_d64ee4a2557248759f93ee883ef4ea73_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="d64ee4a2557248759f93ee883ef4ea73_2_1-choice_0-label" for="input_d64ee4a2557248759f93ee883ef4ea73_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_d64ee4a2557248759f93ee883ef4ea73_2_1"> an ionic bond
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<input type="radio" name="input_d64ee4a2557248759f93ee883ef4ea73_2_1" id="input_d64ee4a2557248759f93ee883ef4ea73_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="d64ee4a2557248759f93ee883ef4ea73_2_1-choice_1-label" for="input_d64ee4a2557248759f93ee883ef4ea73_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_d64ee4a2557248759f93ee883ef4ea73_2_1"> a covalent bond
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<input type="radio" name="input_d64ee4a2557248759f93ee883ef4ea73_2_1" id="input_d64ee4a2557248759f93ee883ef4ea73_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="d64ee4a2557248759f93ee883ef4ea73_2_1-choice_2-label" for="input_d64ee4a2557248759f93ee883ef4ea73_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_d64ee4a2557248759f93ee883ef4ea73_2_1"> a hydrogen bond
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<input type="radio" name="input_d64ee4a2557248759f93ee883ef4ea73_2_1" id="input_d64ee4a2557248759f93ee883ef4ea73_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="d64ee4a2557248759f93ee883ef4ea73_2_1-choice_3-label" for="input_d64ee4a2557248759f93ee883ef4ea73_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_d64ee4a2557248759f93ee883ef4ea73_2_1"> a non-polar bond
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<p>Which interaction is shown within the box labeled 2? Select the best answer.</p>
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<input type="radio" name="input_d64ee4a2557248759f93ee883ef4ea73_3_1" id="input_d64ee4a2557248759f93ee883ef4ea73_3_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="d64ee4a2557248759f93ee883ef4ea73_3_1-choice_0-label" for="input_d64ee4a2557248759f93ee883ef4ea73_3_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_d64ee4a2557248759f93ee883ef4ea73_3_1"> an ionic bond
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<input type="radio" name="input_d64ee4a2557248759f93ee883ef4ea73_3_1" id="input_d64ee4a2557248759f93ee883ef4ea73_3_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="d64ee4a2557248759f93ee883ef4ea73_3_1-choice_3-label" for="input_d64ee4a2557248759f93ee883ef4ea73_3_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_d64ee4a2557248759f93ee883ef4ea73_3_1"> a non-polar bond
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