{"id":2947,"date":"2016-08-24T20:20:40","date_gmt":"2016-08-24T20:20:40","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/?post_type=chapter&#038;p=2947"},"modified":"2016-08-24T20:20:40","modified_gmt":"2016-08-24T20:20:40","slug":"nuclear-fission-processes","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/umes-cheminter\/chapter\/nuclear-fission-processes\/","title":{"raw":"Nuclear Fission Processes","rendered":"Nuclear Fission Processes"},"content":{"raw":"<div class=\"x-ck12-data-objectives\">\r\n<div class=\"textbox learning-objectives\">\r\n<h3>Learning Objectives<\/h3>\r\n<ul>\r\n \t<li>Define nuclear fission.<\/li>\r\n \t<li>Give examples of nuclear fission processes.<\/li>\r\n<\/ul>\r\n<\/div>\r\n<\/div>\r\n<p id=\"x-ck12-nlw\"><span class=\"x-ck12-img-inline\"> <img class=\"alignright\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213729\/20140811160023633329.jpeg\" alt=\"Nuclear fission was first discovered by Fritz Strassman and Otto Hahn\" width=\"200\" \/><\/span><\/p>\r\n<p id=\"x-ck12-YmVhYTY3Y2MxZjAzNjdiM2U3M2NiMTA1ZjBiZTVlZjM.-0nc\"><strong> An Unexpected Result <\/strong><\/p>\r\n<p id=\"x-ck12-OTE1NTc4ZDI4YmUxYTI0NWNhNTk5OWE4YzgzNDJhOTc.-f8u\">Nuclear fission was first discovered by two German scientists, Fritz Strassman and Otto Hahn, in the 1930s. They began their work by bombarding uranium with neutrons, hoping to create larger elements. Instead, they were very surprised to find Ba-141, a much smaller element. They immediately contacted a fellow scientist in the field, Lise Meitner, who carried out calculations to demonstrate that fission had taken place.<\/p>\r\n\r\n<h2>Nuclear Fission<\/h2>\r\n<p id=\"x-ck12-ZDhjZTkyYzA1YzA1ZjRmNzkwNWM0ZjE0YTY4OGZmZTk.-wjs\">Radioactive decay by the release of alpha or beta particles is not the only way new isotopes are formed. When a neutron collides with a nucleus the nucleus splits into two isotopes, each of which is roughly half the mass of the original atom. A small amount of mass is \u201cleft over\u201d and released as energy, as predicted by Einstein\u2019s famous equation <img id=\"x-ck12-MTM2NjYxMzUwODc1Nw..\" class=\"x-ck12-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213730\/dfbab9e1a53c132b76d1884b44d31f56.png\" alt=\"E = mc^2\" width=\"69\" height=\"15\" \/> , that relates mass and energy. This process is known as <strong> nuclear fission. <\/strong> The neutron must be a \u201cslow\u201d neutron, traveling at a speed that is approximately that of the molecules of a gas at the same temperature in the system producing the neutrons. High-speed (\u201cfast\u201d) neutrons will not result in nuclear fission.<\/p>\r\n\r\n<div id=\"x-ck12-NjcyMmZhMjI5YzhiMjEwNDA2OWFkMTM2MTAwMGZkYzU.-t9l\" class=\"x-ck12-img-postcard x-ck12-nofloat\">\r\n\r\n[caption id=\"\" align=\"alignnone\" width=\"321\"]<img id=\"x-ck12-OTgwNDUtMTM2NjYxMjU4Mi0wOS0zNS02LjI.\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213731\/20140811160023761895.png\" alt=\"Fission reaction of Uranium-235\" width=\"321\" height=\"500\" longdesc=\"Fission%20of%20a%20uranium%20nucleus%20produced%20by%20collision%20with%20a%20neutron.\" \/> Figure 1.\u00a0Fission of a uranium nucleus produced by collision with a neutron.[\/caption]\r\n\r\n<\/div>\r\n<p id=\"x-ck12-MGQ0ZjYyZDkwZmNlMWMyNzA2YmM4MTY2M2E3YzlhZjY.-ukq\">The example above illustrates the basic nuclear fission process. A neutron (generally produced by some controlled process, not usually a natural event) collides with an atom of U-235. Momentarily, a U-236 atom forms which then splits into two smaller atoms (Kr-93 and Ba-141) in the diagram. This process results in the release of three new neutrons, which can then initiate fission reactions with more atoms. We will see later how this propagation of neutrons can be employed in a reactor for the generation of electricity.<\/p>\r\n<p id=\"x-ck12-MTM5NzdmMmI2NjI1ZjcyNmI1MGE2ZGZiNWRjMDk4Y2M.-adq\">An extended version of this process can be seen in the figure below. Not every collision of a neutron with U-235 results in a fission reaction. A neutron from the initial fission process may strike an atom of U-238, which does not continue the process. Another neutron may not collide with a nucleus and is lost in the environment. However, a third neutron produced from the initial collision can collide with more U-235 and continue the chain reaction to produce more neutrons.<\/p>\r\n\r\n<div id=\"x-ck12-NGI5OWU1NmY2NzYzMDU3MTUxY2NmZWEwM2EwZGE0Nzc.-ies\" class=\"x-ck12-img-postcard x-ck12-nofloat\">\r\n\r\n[caption id=\"\" align=\"alignnone\" width=\"324\"]<img id=\"x-ck12-OTgwNDUtMTM2NjYxMjY4NC0zNy03MC02LjM.\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213732\/20140811160023842162.png\" alt=\"Chain fission reaction of Uranium-235\" width=\"324\" height=\"500\" longdesc=\"Fission%20reaction%20with%20U-235.\" \/> Figure 2.\u00a0Fission reaction with U-235.[\/caption]\r\n\r\n<\/div>\r\n<p id=\"x-ck12-NTUyZjg1NDg2YzY0NDU3N2U1YzE1NjEwNzMzMGVhNjI.-eak\">Typical nuclear fission reactions balance in terms of mass. The total mass of the reactants is equal to the total mass of the products:<\/p>\r\n<p id=\"x-ck12-i3r\"><img class=\"x-ck12-block-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213733\/e3872a8bb7d605668e0b813597643a67.png\" alt=\"{^{235}_{phantom{0}92}text{U}} + {^1_0n} rightarrow {^{92}_{36}text{Kr}} + {^{142}_{phantom{0}56}text{Ba}} + 2{^1_0n} + text{energy}\" width=\"323\" height=\"21\" \/><\/p>\r\n<p id=\"x-ck12-NjlmZDIwYTU1ZmZhYTllNWFmMzQ4YjdhZGUyNjdhM2E.-dxj\">There are a total of 236 mass units on the left of the equation and 236 mass units on the right. In the same manner, we see 92 protons on the left and 92 on the right. The energy that is released is the binding energy that holds the nucleus together.<\/p>\r\n<p id=\"x-ck12-MTJlZmNhOTAxYzA2ZmRlNTg2N2I1NGY1YjJjNWRlN2I.-cxs\">Another set of fission products from U-235 can be seen in the following reaction:<\/p>\r\n<p id=\"x-ck12-cbq\"><img class=\"x-ck12-block-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213734\/4bc66bba03c81ad7b622095d00188bcd.png\" alt=\"{^{235}_{phantom{0}92}text{U}} + {^1_0n} rightarrow {^{95}_{42}text{Mo}} + {^{139}_{phantom{0}57}text{La}} + 2{^1_0n} + text{energy}\" width=\"326\" height=\"21\" \/><\/p>\r\n<p id=\"x-ck12-MDc2ZjYwZTg0NmVlZmI0NWM5YzgzZGNlYzE0NDFiY2Y.-odh\">Again we see that the total number of mass units and of protons is equal on both sides of the equation.<\/p>\r\n\r\n<h2>Summary<\/h2>\r\n<ul id=\"x-ck12-ZjkyNTIyMDhlMTY5YzA3Y2U2MTkzYTk3NTllMmM3YmU.-zyu\">\r\n \t<li>The process of nuclear fission is described.<\/li>\r\n \t<li>Examples of nuclear fission processes are illustrated.<\/li>\r\n<\/ul>\r\n<h3>Practice<\/h3>\r\n<p id=\"x-ck12-NDg2MTk2ZTc5NGQyMzNiNjIzN2JkNTI5YmRlZTJmZjk.-ore\">Read the material at the link below about the energy involved in nuclear fission and answer the following questions:<\/p>\r\n<p id=\"x-ck12-ZmVlZDA4MmRlYjM5YTZkMmZmN2VhZmQyY2MzZGU2YjA.-v6k\"><a href=\"http:\/\/www.euronuclear.org\/info\/encyclopedia\/n\/nuclear-fission.htm\"> http:\/\/www.euronuclear.org\/info\/encyclopedia\/n\/nuclear-fission.htm <\/a><\/p>\r\n\r\n<ol id=\"x-ck12-Zjc4NDMzYjVhZjZjOGM3ZWZjZjFkNDZmOTM1ZjY1ODM.-s1q\">\r\n \t<li>How much kinetic energy is released in the fission products?<\/li>\r\n \t<li>How much kinetic energy is released in the fission neutrons?<\/li>\r\n \t<li>Is gamma emission a part of the fission process?<\/li>\r\n<\/ol>\r\n<h3>Review<\/h3>\r\n<ol id=\"x-ck12-ZjlmNDk2OGVkMzQ4YzY3ODhhODEyMjAzZTNhZTAyYzc.-mgo\">\r\n \t<li>What is nuclear fission?<\/li>\r\n \t<li>What kind of neutron is needed?<\/li>\r\n \t<li>What else is released besides smaller nuclei?<\/li>\r\n<\/ol>\r\n<h3 class=\"x-ck12-data-problem-set\">Glossary<\/h3>\r\n<div class=\"x-ck12-data-vocabulary\">\r\n<ul id=\"x-ck12-NjE1MjZlMjcyYWNjZDc4NmQ3MjRlMDQ4Zjk1ODBkNjY.-yoh\">\r\n \t<li><strong> nuclear fission: <\/strong> The process by which a heavy atomic nucleus is split into two or more smaller nuclei by a slow-moving neutron with the release of energy.<\/li>\r\n<\/ul>\r\n[reveal-answer q=\"836080\"]Show References[\/reveal-answer]\r\n[hidden-answer a=\"836080\"]\r\n<h2>References<\/h2>\r\n<ol>\r\n \t<li>Courtesy of the US Department of Energy, Office of Public Affairs.<a href=\"http:\/\/commons.wikimedia.org\/wiki\/File:Otto_Hahn_und_Lise_Meitner.jpg\">http:\/\/commons.wikimedia.org\/wiki\/File:Otto_Hahn_und_Lise_Meitner.jpg <\/a>.<\/li>\r\n \t<li>User:Fastfission\/Wikimedia Commons. <a href=\"http:\/\/commons.wikimedia.org\/wiki\/File:Nuclear_fission.svg\">http:\/\/commons.wikimedia.org\/wiki\/File:Nuclear_fission.svg <\/a>.<\/li>\r\n \t<li>User:Fastfission\/Wikimedia Commons.<a href=\"http:\/\/commons.wikimedia.org\/wiki\/File:Fission_chain_reaction.svg\">http:\/\/commons.wikimedia.org\/wiki\/File:Fission_chain_reaction.svg <\/a>.<\/li>\r\n<\/ol>\r\n[\/hidden-answer]\r\n\r\n<\/div>","rendered":"<div class=\"x-ck12-data-objectives\">\n<div class=\"textbox learning-objectives\">\n<h3>Learning Objectives<\/h3>\n<ul>\n<li>Define nuclear fission.<\/li>\n<li>Give examples of nuclear fission processes.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p id=\"x-ck12-nlw\"><span class=\"x-ck12-img-inline\"> <img decoding=\"async\" class=\"alignright\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213729\/20140811160023633329.jpeg\" alt=\"Nuclear fission was first discovered by Fritz Strassman and Otto Hahn\" width=\"200\" \/><\/span><\/p>\n<p id=\"x-ck12-YmVhYTY3Y2MxZjAzNjdiM2U3M2NiMTA1ZjBiZTVlZjM.-0nc\"><strong> An Unexpected Result <\/strong><\/p>\n<p id=\"x-ck12-OTE1NTc4ZDI4YmUxYTI0NWNhNTk5OWE4YzgzNDJhOTc.-f8u\">Nuclear fission was first discovered by two German scientists, Fritz Strassman and Otto Hahn, in the 1930s. They began their work by bombarding uranium with neutrons, hoping to create larger elements. Instead, they were very surprised to find Ba-141, a much smaller element. They immediately contacted a fellow scientist in the field, Lise Meitner, who carried out calculations to demonstrate that fission had taken place.<\/p>\n<h2>Nuclear Fission<\/h2>\n<p id=\"x-ck12-ZDhjZTkyYzA1YzA1ZjRmNzkwNWM0ZjE0YTY4OGZmZTk.-wjs\">Radioactive decay by the release of alpha or beta particles is not the only way new isotopes are formed. When a neutron collides with a nucleus the nucleus splits into two isotopes, each of which is roughly half the mass of the original atom. A small amount of mass is \u201cleft over\u201d and released as energy, as predicted by Einstein\u2019s famous equation <img loading=\"lazy\" decoding=\"async\" id=\"x-ck12-MTM2NjYxMzUwODc1Nw..\" class=\"x-ck12-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213730\/dfbab9e1a53c132b76d1884b44d31f56.png\" alt=\"E = mc^2\" width=\"69\" height=\"15\" \/> , that relates mass and energy. This process is known as <strong> nuclear fission. <\/strong> The neutron must be a \u201cslow\u201d neutron, traveling at a speed that is approximately that of the molecules of a gas at the same temperature in the system producing the neutrons. High-speed (\u201cfast\u201d) neutrons will not result in nuclear fission.<\/p>\n<div id=\"x-ck12-NjcyMmZhMjI5YzhiMjEwNDA2OWFkMTM2MTAwMGZkYzU.-t9l\" class=\"x-ck12-img-postcard x-ck12-nofloat\">\n<div style=\"width: 331px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" id=\"x-ck12-OTgwNDUtMTM2NjYxMjU4Mi0wOS0zNS02LjI.\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213731\/20140811160023761895.png\" alt=\"Fission reaction of Uranium-235\" width=\"321\" height=\"500\" longdesc=\"Fission%20of%20a%20uranium%20nucleus%20produced%20by%20collision%20with%20a%20neutron.\" \/><\/p>\n<p class=\"wp-caption-text\">Figure 1.\u00a0Fission of a uranium nucleus produced by collision with a neutron.<\/p>\n<\/div>\n<\/div>\n<p id=\"x-ck12-MGQ0ZjYyZDkwZmNlMWMyNzA2YmM4MTY2M2E3YzlhZjY.-ukq\">The example above illustrates the basic nuclear fission process. A neutron (generally produced by some controlled process, not usually a natural event) collides with an atom of U-235. Momentarily, a U-236 atom forms which then splits into two smaller atoms (Kr-93 and Ba-141) in the diagram. This process results in the release of three new neutrons, which can then initiate fission reactions with more atoms. We will see later how this propagation of neutrons can be employed in a reactor for the generation of electricity.<\/p>\n<p id=\"x-ck12-MTM5NzdmMmI2NjI1ZjcyNmI1MGE2ZGZiNWRjMDk4Y2M.-adq\">An extended version of this process can be seen in the figure below. Not every collision of a neutron with U-235 results in a fission reaction. A neutron from the initial fission process may strike an atom of U-238, which does not continue the process. Another neutron may not collide with a nucleus and is lost in the environment. However, a third neutron produced from the initial collision can collide with more U-235 and continue the chain reaction to produce more neutrons.<\/p>\n<div id=\"x-ck12-NGI5OWU1NmY2NzYzMDU3MTUxY2NmZWEwM2EwZGE0Nzc.-ies\" class=\"x-ck12-img-postcard x-ck12-nofloat\">\n<div style=\"width: 334px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" id=\"x-ck12-OTgwNDUtMTM2NjYxMjY4NC0zNy03MC02LjM.\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213732\/20140811160023842162.png\" alt=\"Chain fission reaction of Uranium-235\" width=\"324\" height=\"500\" longdesc=\"Fission%20reaction%20with%20U-235.\" \/><\/p>\n<p class=\"wp-caption-text\">Figure 2.\u00a0Fission reaction with U-235.<\/p>\n<\/div>\n<\/div>\n<p id=\"x-ck12-NTUyZjg1NDg2YzY0NDU3N2U1YzE1NjEwNzMzMGVhNjI.-eak\">Typical nuclear fission reactions balance in terms of mass. The total mass of the reactants is equal to the total mass of the products:<\/p>\n<p id=\"x-ck12-i3r\"><img loading=\"lazy\" decoding=\"async\" class=\"x-ck12-block-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213733\/e3872a8bb7d605668e0b813597643a67.png\" alt=\"{^{235}_{phantom{0}92}text{U}} + {^1_0n} rightarrow {^{92}_{36}text{Kr}} + {^{142}_{phantom{0}56}text{Ba}} + 2{^1_0n} + text{energy}\" width=\"323\" height=\"21\" \/><\/p>\n<p id=\"x-ck12-NjlmZDIwYTU1ZmZhYTllNWFmMzQ4YjdhZGUyNjdhM2E.-dxj\">There are a total of 236 mass units on the left of the equation and 236 mass units on the right. In the same manner, we see 92 protons on the left and 92 on the right. The energy that is released is the binding energy that holds the nucleus together.<\/p>\n<p id=\"x-ck12-MTJlZmNhOTAxYzA2ZmRlNTg2N2I1NGY1YjJjNWRlN2I.-cxs\">Another set of fission products from U-235 can be seen in the following reaction:<\/p>\n<p id=\"x-ck12-cbq\"><img loading=\"lazy\" decoding=\"async\" class=\"x-ck12-block-math\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images-archive-read-only\/wp-content\/uploads\/sites\/53\/2014\/08\/19213734\/4bc66bba03c81ad7b622095d00188bcd.png\" alt=\"{^{235}_{phantom{0}92}text{U}} + {^1_0n} rightarrow {^{95}_{42}text{Mo}} + {^{139}_{phantom{0}57}text{La}} + 2{^1_0n} + text{energy}\" width=\"326\" height=\"21\" \/><\/p>\n<p id=\"x-ck12-MDc2ZjYwZTg0NmVlZmI0NWM5YzgzZGNlYzE0NDFiY2Y.-odh\">Again we see that the total number of mass units and of protons is equal on both sides of the equation.<\/p>\n<h2>Summary<\/h2>\n<ul id=\"x-ck12-ZjkyNTIyMDhlMTY5YzA3Y2U2MTkzYTk3NTllMmM3YmU.-zyu\">\n<li>The process of nuclear fission is described.<\/li>\n<li>Examples of nuclear fission processes are illustrated.<\/li>\n<\/ul>\n<h3>Practice<\/h3>\n<p id=\"x-ck12-NDg2MTk2ZTc5NGQyMzNiNjIzN2JkNTI5YmRlZTJmZjk.-ore\">Read the material at the link below about the energy involved in nuclear fission and answer the following questions:<\/p>\n<p id=\"x-ck12-ZmVlZDA4MmRlYjM5YTZkMmZmN2VhZmQyY2MzZGU2YjA.-v6k\"><a href=\"http:\/\/www.euronuclear.org\/info\/encyclopedia\/n\/nuclear-fission.htm\"> http:\/\/www.euronuclear.org\/info\/encyclopedia\/n\/nuclear-fission.htm <\/a><\/p>\n<ol id=\"x-ck12-Zjc4NDMzYjVhZjZjOGM3ZWZjZjFkNDZmOTM1ZjY1ODM.-s1q\">\n<li>How much kinetic energy is released in the fission products?<\/li>\n<li>How much kinetic energy is released in the fission neutrons?<\/li>\n<li>Is gamma emission a part of the fission process?<\/li>\n<\/ol>\n<h3>Review<\/h3>\n<ol id=\"x-ck12-ZjlmNDk2OGVkMzQ4YzY3ODhhODEyMjAzZTNhZTAyYzc.-mgo\">\n<li>What is nuclear fission?<\/li>\n<li>What kind of neutron is needed?<\/li>\n<li>What else is released besides smaller nuclei?<\/li>\n<\/ol>\n<h3 class=\"x-ck12-data-problem-set\">Glossary<\/h3>\n<div class=\"x-ck12-data-vocabulary\">\n<ul id=\"x-ck12-NjE1MjZlMjcyYWNjZDc4NmQ3MjRlMDQ4Zjk1ODBkNjY.-yoh\">\n<li><strong> nuclear fission: <\/strong> The process by which a heavy atomic nucleus is split into two or more smaller nuclei by a slow-moving neutron with the release of energy.<\/li>\n<\/ul>\n<div class=\"qa-wrapper\" style=\"display: block\"><span class=\"show-answer collapsed\" style=\"cursor: pointer\" data-target=\"q836080\">Show References<\/span><\/p>\n<div id=\"q836080\" class=\"hidden-answer\" style=\"display: none\">\n<h2>References<\/h2>\n<ol>\n<li>Courtesy of the US Department of Energy, Office of Public Affairs.<a href=\"http:\/\/commons.wikimedia.org\/wiki\/File:Otto_Hahn_und_Lise_Meitner.jpg\">http:\/\/commons.wikimedia.org\/wiki\/File:Otto_Hahn_und_Lise_Meitner.jpg <\/a>.<\/li>\n<li>User:Fastfission\/Wikimedia Commons. <a href=\"http:\/\/commons.wikimedia.org\/wiki\/File:Nuclear_fission.svg\">http:\/\/commons.wikimedia.org\/wiki\/File:Nuclear_fission.svg <\/a>.<\/li>\n<li>User:Fastfission\/Wikimedia Commons.<a href=\"http:\/\/commons.wikimedia.org\/wiki\/File:Fission_chain_reaction.svg\">http:\/\/commons.wikimedia.org\/wiki\/File:Fission_chain_reaction.svg <\/a>.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n\n\t\t\t <section class=\"citations-section\" role=\"contentinfo\">\n\t\t\t <h3>Candela Citations<\/h3>\n\t\t\t\t\t <div>\n\t\t\t\t\t\t <div id=\"citation-list-2947\">\n\t\t\t\t\t\t\t <div class=\"licensing\"><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Shared previously<\/div><ul class=\"citation-list\"><li>Chemistry Concepts Intermediate. <strong>Authored by<\/strong>: Calbreath, Baxter, et al.. <strong>Provided by<\/strong>: CK12.org. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"http:\/\/www.ck12.org\/book\/CK-12-Chemistry-Concepts-Intermediate\/\">http:\/\/www.ck12.org\/book\/CK-12-Chemistry-Concepts-Intermediate\/<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/\">CC BY-NC: Attribution-NonCommercial<\/a><\/em><\/li><\/ul><\/div>\n\t\t\t\t\t\t <\/div>\n\t\t\t\t\t <\/div>\n\t\t\t <\/section>","protected":false},"author":17,"menu_order":6,"template":"","meta":{"_candela_citation":"[{\"type\":\"cc\",\"description\":\"Chemistry Concepts Intermediate\",\"author\":\"Calbreath, Baxter, et 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