{"id":209265,"date":"2025-04-29T04:05:08","date_gmt":"2025-04-29T04:05:08","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=209265"},"modified":"2025-04-29T04:05:09","modified_gmt":"2025-04-29T04:05:09","slug":"a-substance-decomposes-upon-heating-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/04\/29\/a-substance-decomposes-upon-heating-2\/","title":{"rendered":"A substance decomposes upon heating"},"content":{"rendered":"\n<p>A substance decomposes upon heating. Choose the appropriate classification from the response list below:<\/p>\n\n\n\n<p>a) could be an element or a compound<\/p>\n\n\n\n<p>b) could be an element but not a compound<\/p>\n\n\n\n<p>c) could be a compound but not an element<\/p>\n\n\n\n<p>d) could not be an element nor a compound<\/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:<br><strong>c) could be a compound but not an element<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>When a substance <strong>decomposes upon heating<\/strong>, it breaks down into two or more simpler substances. This behavior is a defining characteristic of <strong>compounds<\/strong>, not elements.<\/p>\n\n\n\n<p><strong>Elements<\/strong> are pure substances made of only one type of atom. They are the simplest form of matter and <strong>cannot<\/strong> be broken down into simpler substances by chemical or physical means, including heating. Examples include oxygen (O\u2082), gold (Au), and iron (Fe). Even if you heat gold or oxygen, they won&#8217;t decompose into anything simpler \u2014 they will remain elements or undergo phase changes (like melting or vaporizing) without breaking into new substances.<\/p>\n\n\n\n<p><strong>Compounds<\/strong>, on the other hand, consist of <strong>two or more different types of atoms chemically bonded together<\/strong>. These bonds can be broken by the input of energy, such as heat, causing the compound to decompose into its constituent elements or simpler compounds. A common example is <strong>calcium carbonate (CaCO\u2083)<\/strong>. When heated, calcium carbonate decomposes into calcium oxide (CaO) and carbon dioxide (CO\u2082) gas:<br>[<br>\\text{CaCO}_3 \\xrightarrow{\\Delta} \\text{CaO} + \\text{CO}_2<br>]<\/p>\n\n\n\n<p>Since decomposition is a chemical change that splits a substance into simpler substances, and only compounds are made of multiple elements chemically combined, <strong>only a compound<\/strong> can decompose in this way.<\/p>\n\n\n\n<p>Thus, if a substance decomposes upon heating, it cannot be an element because elements are already in their simplest chemical form. It must therefore be a compound.<\/p>\n\n\n\n<p><strong>Summary:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Elements<\/strong>: Cannot decompose by heating.<\/li>\n\n\n\n<li><strong>Compounds<\/strong>: Can decompose by heating into simpler substances.<\/li>\n\n\n\n<li><strong>Correct choice<\/strong>: <strong>c) could be a compound but not an element.<\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A substance decomposes upon heating. Choose the appropriate classification from the response list below: a) could be an element or a compound b) could be an element but not a compound c) could be a compound but not an element d) could not be an element nor a compound The correct answer and explanation is [&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-209265","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/209265","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=209265"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/209265\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=209265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=209265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=209265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}