{"id":13191,"date":"2014-02-07T18:58:36","date_gmt":"2014-02-07T18:58:36","guid":{"rendered":"http:\/\/www.mometrix.com\/academy\/?page_id=13191"},"modified":"2026-03-25T15:20:50","modified_gmt":"2026-03-25T20:20:50","slug":"nonpolar-covalent-chemical-bonds","status":"publish","type":"page","link":"https:\/\/www.mometrix.com\/academy\/nonpolar-covalent-chemical-bonds\/","title":{"rendered":"Nonpolar Covalent Bonds"},"content":{"rendered":"\n\t\t\t<div id=\"mmDeferVideoEncompass_6HeAxVuqTh8\" style=\"position: relative;\">\n\t\t\t<picture>\n\t\t\t\t<source srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.webp\" type=\"image\/webp\">\n\t\t\t\t<source srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.png\" type=\"image\/jpeg\"> \n\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" loading=\"eager\" id=\"videoThumbnailImage_6HeAxVuqTh8\" data-source-videoID=\"6HeAxVuqTh8\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.png\" alt=\"Nonpolar Covalent Bonds Video\" height=\"464\" width=\"825\" class=\"size-full\" data-matomo-title = \"Nonpolar Covalent Bonds\">\n\t\t\t<\/picture>\n\t\t\t<\/div>\n\t\t\t<style>img#videoThumbnailImage_6HeAxVuqTh8:hover {cursor:pointer;} img#videoThumbnailImage_6HeAxVuqTh8 {background-size:contain;background-image:url(\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/1481-thumb-final-2.webp\");}<\/style>\n\t\t\t<script defer>\n\t\t\t  jQuery(\"img#videoThumbnailImage_6HeAxVuqTh8\").click(function() {\n\t\t\t\tlet videoId = jQuery(this).attr(\"data-source-videoID\");\n\t\t\t\tlet helpTag = '<div id=\"mmDeferVideoYTMessage_6HeAxVuqTh8\" style=\"display: none;position: absolute;top: -24px;width: 100%;text-align: center;\"><span style=\"font-style: italic;font-size: small;border-top: 1px solid #fc0;\">Having trouble? <a href=\"https:\/\/www.youtube.com\/watch?v='+videoId+'\" target=\"_blank\">Click here to watch on YouTube.<\/a><\/span><\/div>';\n\t\t\t\tlet tag = document.createElement(\"iframe\");\n\t\t\t\ttag.id = \"yt\" + videoId;\n\t\t\t\ttag.src = \"https:\/\/www.youtube-nocookie.com\/embed\/\" + videoId + \"?autoplay=1&controls=1&wmode=opaque&rel=0&egm=0&iv_load_policy=3&hd=0&enablejsapi=1\";\n\t\t\t\ttag.frameborder = 0;\n\t\t\t\ttag.allow = \"autoplay; fullscreen\";\n\t\t\t\ttag.width = this.width;\n\t\t\t\ttag.height = this.height;\n\t\t\t\ttag.setAttribute(\"data-matomo-title\",\"Nonpolar Covalent Bonds\");\n\t\t\t\tjQuery(\"div#mmDeferVideoEncompass_6HeAxVuqTh8\").html(tag);\n\t\t\t\tjQuery(\"div#mmDeferVideoEncompass_6HeAxVuqTh8\").prepend(helpTag);\n\t\t\t\tsetTimeout(function(){jQuery(\"div#mmDeferVideoYTMessage_6HeAxVuqTh8\").css(\"display\", \"block\");}, 2000);\n\t\t\t  });\n\t\t\t  \n\t\t\t<\/script>\n\t\t\n<p><script>\nfunction wTe_Function() {\n  var x = document.getElementById(\"wTe\");\n  if (x.style.display === \"none\") {\n    x.style.display = \"block\";\n  } else {\n    x.style.display = \"none\";\n  }\n}\n<\/script><\/p>\n<div class=\"moc-toc hide-on-desktop hide-on-tablet\">\n<div><button onclick=\"wTe_Function()\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2024\/12\/toc2.svg\" width=\"16\" height=\"16\" alt=\"show or hide table of contents\"><\/button><\/p>\n<p>On this page<\/p>\n<\/div>\n<nav id=\"wTe\" style=\"display:none;\">\n<ul>\n<li class=\"toc-h2\"><a href=\"#Electronegativity_and_Bond_Polarity\" class=\"smooth-scroll\">Electronegativity and Bond Polarity<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Polar_and_Nonpolar_Covalent_Bonds\" class=\"smooth-scroll\">Polar and Nonpolar Covalent Bonds<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#The_Pauling_Scale\" class=\"smooth-scroll\">The Pauling Scale<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Assessing_Bond_Polarities\" class=\"smooth-scroll\">Assessing Bond Polarities<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#The_Impact_of_Bond_Polarity\" class=\"smooth-scroll\">The Impact of Bond Polarity<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Practice\" class=\"smooth-scroll\">Practice<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Review\" class=\"smooth-scroll\">Review<\/a><\/li>\n<\/ul>\n<\/nav>\n<\/div>\n<div class=\"accordion\"><input id=\"transcript\" type=\"checkbox\" class=\"spoiler_button\" \/><label for=\"transcript\">Transcript<\/label>\n<div class=\"spoiler\" id=\"transcript-spoiler\">\n<p>Hi, and welcome to this video on the <strong>polarity of covalent bonds<\/strong>. We\u2019ll begin with a quick review of covalent bonds, then move on to define polarity, consider how to assess if a bond is polar or nonpolar, and finish with a quick discussion on the importance of polarity from a molecular perspective. <\/p>\n<p>Let\u2019s get started!<\/p>\n<h2><span id=\"Electronegativity_and_Bond_Polarity\" class=\"m-toc-anchor\"><\/span>Electronegativity and Bond Polarity<\/h2>\n<p>\nRemember, there are a few different types of chemical bonds. Ionic, metallic, and covalent are the main categories. <strong>Covalent bonds<\/strong> are formed when atoms share their valence electrons. For example, when two chlorine atoms come together, each donates one electron to the bond.  <\/p>\n<p>Each chlorine has \u201caccess\u201d to both bonding electrons, thus, each chlorine has 8 valence electrons, satisfying the octet rule.<\/p>\n<p>Generally, atoms that form covalent bonds are the nonmetals in the top right of the periodic table, like carbon, oxygen, nitrogen, sulfur, phosphorus, and the halogens. Hydrogen is also included, even though it\u2019s not in the top right. These are the atoms we see in organic chemistry.<\/p>\n<h2><span id=\"Polar_and_Nonpolar_Covalent_Bonds\" class=\"m-toc-anchor\"><\/span>Polar and Nonpolar Covalent Bonds<\/h2>\n<p>\nEven though we\u2019re dealing with a small subset of the periodic table, covalent bonds vary drastically in their properties\u2014particularly, in their polarity.  <\/p>\n<p>Let\u2019s define that term, as it\u2019s the focus of this video. The polarity of a covalent bond describes the distribution of the shared electrons in that bond. The more unequal the distribution, the more polar the bond.<\/p>\n<p>Perhaps when you learned about covalent bonds, the default picture in your head was of electrons that were equally shared. This is the case in nonpolar bonds, where the electrons are indeed more or less shared equally between the two atoms.  But that\u2019s not always the case.<\/p>\n<p>In polar covalent bonds, the electrons are not distributed equally between the two atoms. One atom in the bond attracts the electrons more than the other, which results in the electrons spending more time around that atom.  This creates areas of partial positive charge and partial negative charge\u2014or partially charged \u201cpoles\u201d, thus the word <em>polarity<\/em>.<\/p>\n<p><strong>Partial charge<\/strong> is denoted using a lower case sigma and polar bonds are often depicted using shading or the polar arrow. In shading, red indicates areas of partial negative charge and blue represents areas of partial positive charge. The head of the polar arrow points to the negative end of the bond and the plus sign, logically, is at the positive end of the bond.  <\/p>\n<p>A couple of questions may have immediately formed in your mind as we went over this material. Why do some atoms attract bonding electrons more than others? Can we assess polarity just by the chemical formula? How does polarity impact the chemical and physical properties of a molecule?  These are great questions. <\/p>\n<h3><span id=\"Electronegativity\" class=\"m-toc-anchor\"><\/span>Electronegativity<\/h3>\n<p>\nFirst, the tendency for some atoms to attract bonding electrons more strongly than others is described by their electronegativity. Atoms tend to be more electronegative when they are smaller and have large nuclear charges, which results in a stronger pull on the bonding electrons by the nucleus of the atom.<\/p>\n<h3><span id=\"Electron_Affinity\" class=\"m-toc-anchor\"><\/span>Electron Affinity<\/h3>\n<p>\nThis is a very similar property to the electron affinity of an atom, which describes a free atom\u2019s pull on an electron. Thus, similar to the trends in electron affinity, as we go from left to right and up the periodic table, elements get more electronegative, with the exception of the noble gases. This means fluorine is the most electronegative element.<\/p>\n<h2><span id=\"The_Pauling_Scale\" class=\"m-toc-anchor\"><\/span>The Pauling Scale<\/h2>\n<p>\nThe elements have been assigned relative values of electronegativities on the Pauling scale, where fluorine has the highest value of 4. Don\u2019t worry, it\u2019s unlikely that you\u2019ll ever have to memorize these numbers. Most of the time, you will be able to reference them and with some practice, you\u2019ll begin to remember the relative values and won\u2019t need them anymore. <\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-3.png\" alt=\"The periodic table\" width=\"911\" height=\"493\" class=\"aligncenter size-full wp-image-106005\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-3.png 911w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-3-300x162.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-3-768x416.png 768w\" sizes=\"auto, (max-width: 911px) 100vw, 911px\" \/><\/p>\n<p>The quantitative rule of thumb is that when the difference between the atom\u2019s electronegativities is between 0.4 and 1.8, the bond is considered polar and anything less than 0.4 is nonpolar. <\/p>\n<p>Take for example, <strong>hydrogen fluoride<\/strong>. Fluorine is much more electronegative than hydrogen; by the Pauling scale, their difference is 1.8, so it\u2019s a very polar bond.  Thus, the bonding electrons spend much more time around the fluorine atom than the hydrogen atom. This leaves the fluorine end of the bond with a partial negative charge and the hydrogen end of the bond with a partial positive charge.  <\/p>\n<p>Conversely, in <strong>carbon hydrogen bonds<\/strong>, their respective electronegativities are relatively similar, a difference of only 0.35 on the Pauling scale. Thus, the bonding electrons spend approximately equal time around the two atoms and there are no areas of partial charge. Again, these bonds are called nonpolar.<\/p>\n<h2><span id=\"Assessing_Bond_Polarities\" class=\"m-toc-anchor\"><\/span>Assessing Bond Polarities<\/h2>\n<p>\nRemember that when assessing bond polarities, it\u2019s not enough to simply see an electronegative atom to know that it\u2019s a polar bond. If the other atom is similarly electronegative, then the electrons will be equally shared and the bond is nonpolar.  So going back to our chlorine example, even though chlorine is the third most electronegative element, the chlorine-chlorine bond is nonpolar because the chlorines are attracting the electrons equally. However, bond that chlorine to a carbon and you have yourself a polar bond.<\/p>\n<p>Lastly, let\u2019s address that third question about the impact of polarity.<\/p>\n<h2><span id=\"The_Impact_of_Bond_Polarity\" class=\"m-toc-anchor\"><\/span>The Impact of Bond Polarity<\/h2>\n<p>\nRemember that in polar bonds, there are areas of partial positive and negative charges. This creates an opportunity for attractive interactions. Polar bonds can line up with other polar bonds; these are called dipole-dipole interactions. <\/p>\n<p>They are weak in comparison to ionic, metallic, or covalent bonds, but in aggregate, they account for many of the chemical and physical properties of molecular compounds. In contrast, because nonpolar bonds are more or less neutral throughout, their intermolecular interactions are much weaker.  <\/p>\n<p>That\u2019s just one example of how polarity impacts the properties of molecular compounds. Polarity also plays an important role in the reactivity and solubility of compounds. For example, you may have heard the phrase, \u201clike dissolves like.\u201d Well, the \u201clike\u201d in the phrase usually refers to polar and nonpolar, meaning that polar compounds dissolve in other polar compounds and nonpolar compounds dissolve in other nonpolar compounds.<\/p>\n<hr>\n<h2><span id=\"Practice\" class=\"m-toc-anchor\"><\/span>Practice<\/h2>\n<p>\nLet\u2019s wrap up today\u2019s video with some practice.<\/p>\n<p>To this point, we have only considered diatomic molecules, but we can also assign the polarity of bonds within larger molecules. Here\u2019s a quick example with chloromethane. The chlorine is significantly more electronegative than the carbon atom, making that chlorine-carbon bond polar. So, we\u2019ll mark it with a polar arrow pointing towards the chlorine. On the other hand, the carbon-hydrogen bonds are all nonpolar, so we can leave them without an arrow.<\/p>\n<p>Now, copy down the structure for acetic acid and do the same thing, drawing polar arrows for any polar bond.  Refer to the Pauling scale here if you need it.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-1.png\" alt=\"H4C2O2 Covalent bond\" width=\"867\" height=\"521\" class=\"aligncenter size-full wp-image-105996\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-1.png 867w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-1-300x180.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-1-768x462.png 768w\" sizes=\"auto, (max-width: 867px) 100vw, 867px\" \/><\/p>\n<p>Alright, oxygen is more electronegative than both carbon (a difference of 0.89) and hydrogen (a difference of 1.24), so we can draw in polar arrows showing partial negative charges on both oxygens. This leaves the central carbon and the hydrogen that is attached to the oxygen partially positive, while the group of carbon-hydrogen bonds is nonpolar.  <\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-2.png\" alt=\"Example of covalent bond\" width=\"857\" height=\"492\" class=\"aligncenter size-full wp-image-106002\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-2.png 857w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-2-300x172.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/12\/Polarity-of-Covalent-Bonds-2-768x441.png 768w\" sizes=\"auto, (max-width: 857px) 100vw, 857px\" \/><\/p>\n<h2><span id=\"Review\" class=\"m-toc-anchor\"><\/span>Review<\/h2>\n<p>\nTo wrap up, let\u2019s quickly recap what we\u2019ve just discussed. Polar covalent bonds result when electrons are unequally shared between atoms, while nonpolar covalent bonds result when electrons are more equally shared between atoms. The unequal sharing of electrons is due to the differences in the electronegativities of the two atoms sharing the electrons. This unequal sharing of electrons causes partial charges to develop.<\/p>\n<p>The greater the difference in electronegativities between the two atoms, the stronger the dipole is. For example, the covalent bonds formed between the carbon atom and the two oxygen atoms in carbon dioxide are polar covalent bonds because the electronegativities of carbon and oxygen differ. If the electronegativities are closer to equal, then the covalent bonds are nonpolar.<\/p>\n<p>Alright, that\u2019s all for this review! Thanks for watching, and happy studying!<\/p>\n<\/div>\n<\/div>\n\n<div class=\"home-buttons\">\n<p><a href=\"https:\/\/www.mometrix.com\/academy\/chemistry\/\">Return to Chemistry Videos<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Return to Chemistry Videos<\/p>\n","protected":false},"author":1,"featured_media":109305,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":{"0":"post-13191","1":"page","2":"type-page","3":"status-publish","4":"has-post-thumbnail","6":"page_category-chemistry-bonds-videos","7":"page_type-video","8":"subject_matter-science"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/pages\/13191","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/comments?post=13191"}],"version-history":[{"count":6,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/pages\/13191\/revisions"}],"predecessor-version":[{"id":286249,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/pages\/13191\/revisions\/286249"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/media\/109305"}],"wp:attachment":[{"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/media?parent=13191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}