{"id":214505,"date":"2025-05-14T18:22:09","date_gmt":"2025-05-14T18:22:09","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=214505"},"modified":"2025-05-14T18:22:14","modified_gmt":"2025-05-14T18:22:14","slug":"a-pentane-c5h12-molecule-is-nonpolar-while-water-h2o-is-polar-3","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/14\/a-pentane-c5h12-molecule-is-nonpolar-while-water-h2o-is-polar-3\/","title":{"rendered":"A pentane (C5H12) molecule is nonpolar while water (H2O) is polar"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A pentane (C5H12) molecule is nonpolar while water (H2O) is polar. According to this information: a. Pentane has a higher melting point and boiling point than water b. Water has a higher melting point than pentane, but pentane has a higher boiling point than water c. Water has a higher melting point and boiling point than pentane d. Pentane has a higher melting point than water, but water has a higher boiling point than pentane<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Correct Answer: c. Water has a higher melting point and boiling point than pentane<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The physical properties of a substance\u2014like melting point and boiling point\u2014are largely influenced by the types and strengths of <strong>intermolecular forces<\/strong> present. In this case, we are comparing <strong>pentane (C\u2085H\u2081\u2082)<\/strong>, a <strong>nonpolar hydrocarbon<\/strong>, with <strong>water (H\u2082O)<\/strong>, a <strong>polar molecule<\/strong>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Water: Strong Intermolecular Forces<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Water is a <strong>polar molecule<\/strong> due to the bent shape and the difference in electronegativity between oxygen and hydrogen. More importantly, water exhibits <strong>hydrogen bonding<\/strong>, one of the strongest types of intermolecular forces. These hydrogen bonds occur between the hydrogen atom of one water molecule and the oxygen atom of another. As a result, it takes a significant amount of energy to break these bonds for water to melt or boil.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Melting Point of Water<\/strong>: 0\u00b0C<\/li>\n\n\n\n<li><strong>Boiling Point of Water<\/strong>: 100\u00b0C<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Pentane: Weak Intermolecular Forces<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Pentane, on the other hand, is <strong>nonpolar<\/strong>, meaning it lacks partial charges that would create strong attractions between molecules. The only type of intermolecular force present in pentane is <strong>London dispersion forces<\/strong>, which are the weakest. These arise due to temporary shifts in electron clouds that induce momentary dipoles.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Melting Point of Pentane<\/strong>: About -130\u00b0C<\/li>\n\n\n\n<li><strong>Boiling Point of Pentane<\/strong>: About 36\u00b0C<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Comparison<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Because water has <strong>hydrogen bonds<\/strong> (strong) and pentane has only <strong>London dispersion forces<\/strong> (weak), <strong>water requires more energy to change states<\/strong>, leading to higher melting and boiling points. Both of water\u2019s phase change points are significantly higher than those of pentane.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Therefore, the correct answer is <strong>(c)<\/strong>: <em>Water has a higher melting point and boiling point than pentane<\/em> due to the strength of hydrogen bonding in water compared to the weak dispersion forces in pentane.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A pentane (C5H12) molecule is nonpolar while water (H2O) is polar. According to this information: a. Pentane has a higher melting point and boiling point than water b. Water has a higher melting point than pentane, but pentane has a higher boiling point than water c. Water has a higher melting point and boiling point [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-214505","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/214505","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=214505"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/214505\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=214505"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=214505"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=214505"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}