{"id":169969,"date":"2024-11-19T15:20:07","date_gmt":"2024-11-19T15:20:07","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=169969"},"modified":"2024-11-19T15:20:09","modified_gmt":"2024-11-19T15:20:09","slug":"which-of-the-following-describes-a-chemical-change-involving-water","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2024\/11\/19\/which-of-the-following-describes-a-chemical-change-involving-water\/","title":{"rendered":"Which of the following describes a chemical change involving water"},"content":{"rendered":"\n<p>Which of the following describes a chemical change involving water? a) H\u2082O(l) \u2192 H\u2082O(s) b) H\u2082O(s) \u2192 H\u2082O(g) c) H\u2082O(l) \u2192 H\u2082(g) + O\u2082(g) d) H\u2082O(g) \u2192 H\u2082O(l)<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The correct answer is <strong>c) H\u2082O(l) \u2192 H\u2082(g) + O\u2082(g)<\/strong>.<\/p>\n\n\n\n<p>This represents a <strong>chemical change<\/strong> where water (H\u2082O) is decomposed into hydrogen (H\u2082) and oxygen (O\u2082) gases. This process is known as <strong>electrolysis<\/strong> of water. Here\u2019s why it\u2019s a chemical change:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chemical change<\/strong> involves the transformation of one substance into a different substance, often with the formation of new products and a change in chemical composition. This is distinct from a <strong>physical change<\/strong>, where the substance undergoes a change in state or appearance without changing its molecular structure.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Electrolysis of Water (c)<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Electrolysis involves passing an electric current through water, causing it to break apart into hydrogen and oxygen gases. This change is <strong>chemical<\/strong> because the water molecules (H\u2082O) are chemically altered, resulting in the production of two different substances: hydrogen (H\u2082) and oxygen (O\u2082). The molecular structure of water is broken down, making it a clear example of a chemical change.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Physical Changes<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>a) H\u2082O(l) \u2192 H\u2082O(s)<\/strong>: This is the freezing of water, a <strong>physical change<\/strong> where water changes from liquid to solid (ice), but no new substance is formed.<\/li>\n\n\n\n<li><strong>b) H\u2082O(s) \u2192 H\u2082O(g)<\/strong>: This is the sublimation of ice (a phase change from solid to gas), which is also a <strong>physical change<\/strong> because the molecular structure of H\u2082O remains the same.<\/li>\n\n\n\n<li><strong>d) H\u2082O(g) \u2192 H\u2082O(l)<\/strong>: This is condensation (gas to liquid), another <strong>physical change<\/strong>, as the molecules remain unchanged, only the phase of water changes.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion:<\/h3>\n\n\n\n<p>In <strong>option c<\/strong>, water undergoes a chemical reaction where it is decomposed into hydrogen and oxygen gases. This is the only option where new substances are formed, marking it as a chemical change. The other options involve phase changes (solid to liquid, liquid to gas) that do not alter the chemical composition of water.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following describes a chemical change involving water? a) H\u2082O(l) \u2192 H\u2082O(s) b) H\u2082O(s) \u2192 H\u2082O(g) c) H\u2082O(l) \u2192 H\u2082(g) + O\u2082(g) d) H\u2082O(g) \u2192 H\u2082O(l) The Correct Answer and Explanation is : The correct answer is c) H\u2082O(l) \u2192 H\u2082(g) + O\u2082(g). This represents a chemical change where water (H\u2082O) is decomposed [&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-169969","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/169969","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=169969"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/169969\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=169969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=169969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=169969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}