{"id":37732,"date":"2022-10-11T00:17:08","date_gmt":"2022-10-10T16:17:08","guid":{"rendered":"https:\/\/ocw.nycu.edu.tw\/?post_type=course_page&#038;p=37732"},"modified":"2026-06-29T12:22:12","modified_gmt":"2026-06-29T04:22:12","slug":"6-6-the-first-law-6-7-a-molecular-interlude%ef%bc%9athe-origin-of-internal-energy","status":"publish","type":"course_page","link":"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/college-of-science\/department-of-applied-chemistry\/chemistry-i-english-96-academic-year-department-of-applied-chemistry-prof-henryk-witek\/6-6-the-first-law-6-7-a-molecular-interlude%ef%bc%9athe-origin-of-internal-energy","title":{"rendered":"6-6 The First Law, 6-7 A Molecular Interlude\uff1aThe Origin of Internal Energy"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"37732\" class=\"elementor elementor-37732\">\n\t\t\t\t\t\t\t\t\t<section class=\"penci-section penci-disSticky penci-structure-10 elementor-section 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class=\"elementor-heading-title elementor-size-default\">6-6 The First Law, 6-7 A Molecular Interlude\uff1aThe Origin of Internal Energy\n<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7aec5b11 elementor-widget elementor-widget-video\" data-id=\"7aec5b11\" data-element_type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/youtu.be\\\/Va-zwiC9Nro&quot;,&quot;modestbranding&quot;:&quot;yes&quot;,&quot;lazy_load&quot;:&quot;yes&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.13.3 - 28-05-2023 *\/\n.elementor-widget-video .elementor-widget-container{overflow:hidden;transform:translateZ(0)}.elementor-widget-video .elementor-wrapper{aspect-ratio:var(--video-aspect-ratio)}.elementor-widget-video .elementor-wrapper iframe,.elementor-widget-video .elementor-wrapper 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100%;-webkit-mask-repeat:var(--divider-pattern-repeat);mask-repeat:var(--divider-pattern-repeat);background-color:var(--divider-color);-webkit-mask-image:var(--divider-pattern-url);mask-image:var(--divider-pattern-url)}.elementor-widget-divider--no-spacing{--divider-pattern-size:auto}.elementor-widget-divider--bg-round{--divider-pattern-repeat:round}.rtl .elementor-widget-divider .elementor-divider__text{direction:rtl}.e-con-inner>.elementor-widget-divider,.e-con>.elementor-widget-divider{width:var(--container-widget-width,100%);--flex-grow:var(--container-widget-flex-grow)}<\/style>\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-da19150 elementor-widget elementor-widget-shortcode\" data-id=\"da19150\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\">\n<table id=\"tablepress-83\" class=\"tablepress tablepress-id-83\">\n<thead>\n<tr class=\"row-1 odd\">\n\t<th class=\"column-1\">Week<\/th><th class=\"column-2\">Course Content<\/th><th class=\"column-3\">Course Video<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-hover\">\n<tr class=\"row-2 even\">\n\t<td class=\"column-1\">Chapter 1<\/td><td class=\"column-2\">Chapter 1 The Quantum World<br \/>\n1-1 The Nuclear Atom<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=36361\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-3 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">1-2 The Characteristics of Electromagnetic Radiation <br \/>\n1-3 Atomic Spectra<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37515\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-4 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">1-4 Radiation, Quanta, and Photons <br \/>\n1-5 The Wave-Particle Duality of Matter<br \/>\n1-6 The Uncertainty Principle<br \/>\n1-7 Wavefunctions and Energy Levels<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37521\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-5 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">1-8 The Principle Quantum Number <br \/>\n1-9 Atomic Orbitals<br \/>\n1-10 Electron Spin<br \/>\n1-11 The Electronic Structure of Hydrogen<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37527\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-6 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">1-12 Orbital Energies <br \/>\n1-13 The Building-Up Principle<br \/>\n1-14 Electronic Structure and the Periodic Table  (1\/2)<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37560\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-7 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">1-12 Orbital Energies <br \/>\n1-13 The Building-Up Principle<br \/>\n1-14 Electronic Structure and the Periodic Table  (2\/2) <\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37566\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-8 even\">\n\t<td class=\"column-1\">Chapter 2<\/td><td class=\"column-2\">Chapter 2 Chemical Bonds<br \/>\n2-1 The Ions That Elements Form <br \/>\n2-2 Lewis Symbols<br \/>\n2-3 The Energetics of Ionic Bond Formation<br \/>\n2-4 Interactions Between Ions<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37572\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-9 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">2-5 Lewis Structure <br \/>\n2-6 Lewis Structure for Polyatomic Species<br \/>\n2-7 Resonance <br \/>\n2-8 Formal Charge (1\/2)<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37578\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-10 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">2-5 Lewis Structure <br \/>\n2-6 Lewis Structure for Polyatomic Species<br \/>\n2-7 Resonance <br \/>\n2-8 Formal Charge (2\/2)<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37584\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-11 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">2-9 Radicals and Biradicals <br \/>\n2-10 Expanded Valence Shells<br \/>\n2-11The Unusual Structures of Some Group<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37590\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-12 even\">\n\t<td class=\"column-1\">Chapter 3<\/td><td class=\"column-2\">Chapter 3 Molecular Shape and Structure<br \/>\n3-1 The Basic VSEPR Model<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37596\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-13 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">3-2 Molecules with Lone Pairs on the Central Atom<br \/>\n3-3 Polar Molecules<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37604\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-14 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">3-4 Sigma and Pi Bonds <br \/>\n3-5 Electron Promotion and the Hybridization of Orbitals<br \/>\n3-6 Other Common Types of Hybridization<br \/>\n3-7 Characteristics of Multiple Bonds<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37610\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-15 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">3-8 The Limitations of Lewiss Theory <br \/>\n3-9 Molecular Orbitals<br \/>\n3-10 The Electron Configurations of Diatomic Molecules<br \/>\n3-11 Bonding in Heteronucleat Diatomic Molecules<br \/>\n3-12 Orbitals in Polyatomic Molecules<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37616\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-16 even\">\n\t<td class=\"column-1\">Chapter 4<\/td><td class=\"column-2\">Chapter 4 The Properties of Gases<br \/>\n4-1 Observing Gases <br \/>\n4-2 Pressure<br \/>\n4-3 Alternative Units of Pressure<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37622\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-17 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">4-4 The Experimental Observeations <br \/>\n4-5 Applications of the Ideal Gas Law<br \/>\n4-6 Gas Density<br \/>\n4-7 The Stoichiometry of Reacting Gases<br \/>\n4-8 Mixtures of Gases<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37628\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-18 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">4-9 Diffusion and Effusion <br \/>\n4-10 The Kinetic Model of Gases<br \/>\n4-11 The Maxwell Distribution of Speeds<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37634\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-19 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">4-12 Deviations from Ideality <br \/>\n4-13 The Liquefaction of Gases<br \/>\n4-14 Equations of State of Real Gases<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37642\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-20 even\">\n\t<td class=\"column-1\">Chapter 5<\/td><td class=\"column-2\">Chapter 5 Liquids and Solids<br \/>\n5-1 The Formation of Condensed Phases <br \/>\n5-2 Ion-Dipole Forces<br \/>\n5-3 Dipole-Dipole Forces<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37654\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-21 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">5-3 Dipole-Dipole Forces<br \/>\n5-4 London Forces<br \/>\n5-5 Hydrogen Bonding<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37664\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-22 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">5-6 Order in Liquids <br \/>\n5-7 Viscosity and Surface Tension<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37670\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-23 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">5-8 Classification of Solids <br \/>\n5-9 Molecular Solids<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37684\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-24 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">5-9 Molecular Solids<br \/>\n5-10 Network Solid<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37690\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-25 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">5-11 Metallic Solids <br \/>\n5-12 Unit Cells<br \/>\n5-13 Ionic Structures<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37696\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-26 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">5-14 The Properties of Solids <br \/>\n5-15 Alloys<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37702\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-27 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">5-16 Liquid Crystals <br \/>\n5-17 Ionic Liquids<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37708\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-28 even\">\n\t<td class=\"column-1\">Chapter 6<\/td><td class=\"column-2\">Chapter 6 Thermodynamics\uff1aThe First Law<br \/>\n6-1 Systems <br \/>\n6-2 Work and Energy<br \/>\n6-3 Expansion Work<br \/>\n6-4 Heat<br \/>\n6-5 The Measurement of Heat<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37714\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-29 odd\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">6-6 The First Law\u3000 <br \/>\n6-7 A Molecular Interlude\uff1aThe Origin of Internal Energy<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37732\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-30 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">6-8 Heat Transfers at Constant Pressure <br \/>\n6-9 Heat Capacities at Constant Volume and Constant Pressure<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37738\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-31 odd\">\n\t<td class=\"column-1\">Chapter 6<br \/>\nChapter 7<\/td><td class=\"column-2\">6-10 A Molecular Interlude\uff1aThe Origin of the Heat Capacities of Gases <br \/>\n6-11 The Enthalpy of Physical Change<br \/>\n6-12 Heating Curves<br \/>\n<br \/>\nChapter 7 Thermodynamics\uff1aThe Second and Third Laws<br \/>\n7-1 Spontaneous Change <br \/>\n7-2 Entropy and<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37744\">Watch Online<\/a><\/td>\n<\/tr>\n<tr class=\"row-32 even\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\">7-4 Entropy Changes Accompanying Changes in Physical State <br \/>\n7-5 A Molecular Interpretation of Entropy<br \/>\n7-6 The Equivalence of Statistical and Thermodynamic Entropies<br \/>\n7-7 Standard Molar Entropies <br \/>\n7-8 Standard Reaction E<\/td><td class=\"column-3\"><a href=\"\/?post_type=course_page&amp;p=37753\">Watch Online<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-83 from cache --><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"penci-ercol-50 penci-ercol-order-3 penci-sticky-ct    elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-5f099062\" data-id=\"5f099062\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5b79cc32 elementor-widget-divider--view-line_text elementor-widget-divider--element-align-center elementor-widget elementor-widget-divider\" data-id=\"5b79cc32\" data-element_type=\"widget\" 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menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-141797\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/colege-of-medicine-en\" class=\"elementor-item\">College of Medicine<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-118072\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/course-of-chinese-center\" class=\"elementor-item\">Course of Chinese Center<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-120431\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/liberal-arts-college\" class=\"elementor-item\">Forum Of Liberal Arts<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-123746\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/speech-of-general-education-center\" class=\"elementor-item\">Contemporary 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href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/college-of-computer-science\" class=\"elementor-item\" tabindex=\"-1\">College of Computer Science<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-5374\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/college-of-biological-science-and-technology\" class=\"elementor-item\" tabindex=\"-1\">College of Engineering Bioscience<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-5379\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/college-of-humanities-and-social-sciences\" class=\"elementor-item\" tabindex=\"-1\">College of Humanities Arts and Social Sciences<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-5378\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/college-of-hakka-affair-culture\" class=\"elementor-item\" tabindex=\"-1\">College of Hakka Affair Culture<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-118070\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/school-of-law\" class=\"elementor-item\" tabindex=\"-1\">School of Law<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-118069\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/school-of-nursing-2\" class=\"elementor-item\" tabindex=\"-1\">School of Nursing<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-118071\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/college-of-photonics\" class=\"elementor-item\" tabindex=\"-1\">College of Photonics<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-125874\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/college-of-biomedical-science-and-engineering\" class=\"elementor-item\" tabindex=\"-1\">College of Biomedical Science and Engineering<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-132738\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/college-of-life-sciences-en\" class=\"elementor-item\" tabindex=\"-1\">College of Life Sciences<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-141797\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/colege-of-medicine-en\" class=\"elementor-item\" tabindex=\"-1\">College of Medicine<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-118072\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/course-of-chinese-center\" class=\"elementor-item\" tabindex=\"-1\">Course of Chinese Center<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-120431\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/liberal-arts-college\" class=\"elementor-item\" tabindex=\"-1\">Forum Of Liberal Arts<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-123746\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/speech-of-general-education-center\" class=\"elementor-item\" tabindex=\"-1\">Contemporary Civilization<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-128240\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/reading-of-classic-masterpiece\" class=\"elementor-item\" tabindex=\"-1\">Reading of Classic Masterpiece<\/a><\/li>\n<li class=\"menu-item menu-item-type-post_type menu-item-object-course_page ajax-mega-menu menu-item-123745\"><a href=\"https:\/\/ocw.nycu.edu.tw\/?course_page=all-course-2\/course-of-general-education-center-2\" class=\"elementor-item\" tabindex=\"-1\">Course of General Education Center<\/a><\/li>\n<\/ul>\t\t\t<\/nav>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>6-6 The First &hellip;<\/p>\n","protected":false},"featured_media":0,"parent":36338,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","format":"standard","meta":{"footnotes":""},"categories":[1690],"tags":[],"class_list":["post-37732","course_page","type-course_page","status-publish","format-standard","hentry","category-chemistry-i-english-96-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>6-6 The First Law, 6-7 A Molecular Interlude\uff1aThe Origin of Internal Energy 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