{"id":214496,"date":"2025-05-14T17:29:16","date_gmt":"2025-05-14T17:29:16","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=214496"},"modified":"2025-05-14T17:29:19","modified_gmt":"2025-05-14T17:29:19","slug":"a-pentane-c5h12-molecule-is-nonpolar-while-water-h2o-is-polar-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/14\/a-pentane-c5h12-molecule-is-nonpolar-while-water-h2o-is-polar-2\/","title":{"rendered":"A pentane (C5H12) molecule is nonpolar while water (H2O) is polar."},"content":{"rendered":"\n

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

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

The correct answer is: c. Water has a higher melting point and boiling point than pentane.<\/strong><\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n

The physical properties such as melting point<\/strong> and boiling point<\/strong> of substances are largely influenced by the intermolecular forces<\/strong> between their molecules. In this context, we are comparing water (H\u2082O)<\/strong> and pentane (C\u2085H\u2081\u2082)<\/strong>.<\/p>\n\n\n\n

1. Polarity and Intermolecular Forces:<\/strong><\/h4>\n\n\n\n
    \n
  • Water<\/strong> is a polar molecule<\/strong> due to the bent shape of the molecule and the difference in electronegativity between hydrogen and oxygen. Because of this polarity, water molecules are held together by hydrogen bonds<\/strong>, which are among the strongest types of intermolecular forces.<\/li>\n\n\n\n
  • Pentane<\/strong>, on the other hand, is a nonpolar molecule<\/strong>. The carbon-hydrogen bonds and the overall symmetrical arrangement of the molecule cause it to lack polarity. As a result, the only intermolecular forces present in pentane are London dispersion forces<\/strong>, which are much weaker than hydrogen bonds.<\/li>\n<\/ul>\n\n\n\n

    2. Melting and Boiling Points:<\/strong><\/h4>\n\n\n\n
      \n
    • Substances with stronger intermolecular forces<\/strong> generally require more energy<\/strong> to overcome these forces and undergo phase changes like melting or boiling. This leads to higher melting and boiling points<\/strong>.<\/li>\n\n\n\n
    • Since water forms hydrogen bonds and pentane only exhibits weak dispersion forces, water has both a higher melting point and a higher boiling point<\/strong> than pentane.<\/li>\n<\/ul>\n\n\n\n

      3. Empirical Data Supports This:<\/strong><\/h4>\n\n\n\n
        \n
      • Melting Point of Water:<\/strong> 0\u00b0C<\/li>\n\n\n\n
      • Boiling Point of Water:<\/strong> 100\u00b0C<\/li>\n\n\n\n
      • Melting Point of Pentane:<\/strong> ~\u2212130\u00b0C<\/li>\n\n\n\n
      • Boiling Point of Pentane:<\/strong> ~36\u00b0C<\/li>\n<\/ul>\n\n\n\n

        This data clearly confirms the conceptual explanation above.<\/p>\n\n\n\n

        Conclusion:<\/h3>\n\n\n\n

        Due to its strong hydrogen bonding, water has both a higher melting point and boiling point<\/strong> than the nonpolar molecule pentane. Thus, the correct answer is (c)<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"

        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 […]<\/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-214496","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/214496","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=214496"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/214496\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=214496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=214496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=214496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}