{"id":194547,"date":"2025-02-24T09:02:23","date_gmt":"2025-02-24T09:02:23","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=194547"},"modified":"2025-02-24T09:02:26","modified_gmt":"2025-02-24T09:02:26","slug":"the-first-law-of-thermodynamics-tells-us","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/24\/the-first-law-of-thermodynamics-tells-us\/","title":{"rendered":"The First Law of Thermodynamics tells us"},"content":{"rendered":"\n

The First Law of Thermodynamics tells us
A) that the energy of the universe is always increasing.
B) that the energy of the universe is a constant.
C) that the energy for a chemical reaction is a constant.
D) that a chemical reaction will always release energy.<\/p>\n\n\n\n

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

The correct answer is:
B) that the energy of the universe is a constant.<\/strong><\/p>\n\n\n\n

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

The First Law of Thermodynamics<\/strong>, also known as the Law of Energy Conservation<\/strong>, states that energy cannot be created or destroyed, only transferred or converted from one form to another<\/strong>. This principle is foundational to both physics and chemistry, dictating how energy behaves in all natural processes.<\/p>\n\n\n\n

In mathematical terms, the First Law is often expressed as:
[
\\Delta U = Q – W
]
where:<\/p>\n\n\n\n

    \n
  • ( \\Delta U ) is the change in internal energy of a system,<\/li>\n\n\n\n
  • ( Q ) is the heat added to the system,<\/li>\n\n\n\n
  • ( W ) is the work done by the system.<\/li>\n<\/ul>\n\n\n\n

    This equation tells us that any energy added to a system as heat must either increase its internal energy or be used to do work.<\/p>\n\n\n\n

    Since energy cannot be created or destroyed, the total energy in the universe remains constant<\/strong>\u2014it simply changes forms. For example, in chemical reactions, energy may be stored in chemical bonds and later released as heat or work, but the overall energy remains the same.<\/p>\n\n\n\n

    Now, let\u2019s examine the incorrect answer choices:<\/p>\n\n\n\n

      \n
    • A) “The energy of the universe is always increasing”<\/strong> \u2013 Incorrect, because while entropy (disorder) increases over time (Second Law of Thermodynamics), total energy remains constant.<\/li>\n\n\n\n
    • C) “The energy for a chemical reaction is a constant”<\/strong> \u2013 Incorrect, because energy can be exchanged between a system and its surroundings.<\/li>\n\n\n\n
    • D) “A chemical reaction will always release energy”<\/strong> \u2013 Incorrect, because some reactions absorb energy (endothermic reactions).<\/li>\n<\/ul>\n\n\n\n

      Thus, the correct answer remains B: The energy of the universe is a constant.<\/strong><\/p>\n\n\n\n

      Now, I\u2019ll generate an image related to the First Law of Thermodynamics.<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      Here is an image illustrating the First Law of Thermodynamics, depicting the energy cycle with heat ((Q)), work ((W)), and internal energy ((U)) in a closed system. Let me know if you need any modifications or additional details!<\/p>\n","protected":false},"excerpt":{"rendered":"

      The First Law of Thermodynamics tells usA) that the energy of the universe is always increasing.B) that the energy of the universe is a constant.C) that the energy for a chemical reaction is a constant.D) that a chemical reaction will always release energy. The Correct Answer and Explanation is : The correct answer is:B) that […]<\/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-194547","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/194547","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=194547"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/194547\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=194547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=194547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=194547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}