{"id":5979,"date":"2020-10-13T12:11:54","date_gmt":"2020-10-13T06:41:54","guid":{"rendered":"http:\/\/astan.lk\/al_virtualclassroom\/?p=5979"},"modified":"2020-10-13T12:11:44","modified_gmt":"2020-10-13T06:41:44","slug":"chemical-actions","status":"publish","type":"post","link":"https:\/\/astan.lk\/al_virtualclassroom\/chemical-actions\/","title":{"rendered":"The spontaneity of chemical reactions"},"content":{"rendered":"

\u2022 Entropy of a system is a measure of the randomness of the system.<\/p>\n

\u2022 Entropy is a function of state and it depends only on the initial and final state of the system and is independent of the path of the change.<\/p>\n

\u2022 Entropy is also a factor affecting both chemical and physical changes.<\/p>\n

\u2022 Spontaneous changes in an isolated system takes place with an increase in entropy.<\/p>\n

\u2022 As the entropy related to a certain system is a function of state, the change in entropy can be calculated by subtracting the initial value of entropy from the final value of entropy.<\/p>\n

\u2206S = S final<\/sub> – S initial<\/sub><\/p>\n

\u2022 For a chemical reaction, \u2206S = S products<\/sub> – S reactants<\/sub><\/strong><\/p>\n

\u2022 If this change is measured under the standard conditions \u2206S \u03b8<\/sup> = S\u03b8<\/sup> products<\/sub> – S\u03b8<\/sup> reactants<\/sub><\/strong><\/p>\n

 <\/p>\n

\u2022 The total influence of \u2206\u0397 and \u2206S on a change is given by the Gibbs energy change which is \u2206G. The relationship among these at constant temperature (T) is as follows.<\/p>\n

\u2206G = \u2206H – T\u2206S<\/strong><\/p>\n

At a constant temperature and pressure; for a spontaneous reaction \u2206G < 0 for a reaction which is not spontaneous \u2206G > 0 \u00a0 for a reaction at equilibrium \u2206G = 0<\/p>\n

Spontaneity of a system with a constant entropy (\u2206S = 0) is decided by \u2206H and the spontaneity of a change that takes place under a constant enthalpy (\u2206H = 0) is decided by \u2206S.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u2022 Entropy of a system is a measure of the randomness of the system. \u2022 Entropy is a function of state and it depends only on the initial and final state of the system and is independent of the path of the change. \u2022 Entropy is also a factor affecting both chemical and physical changes. […]<\/p>\n","protected":false},"author":842,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[14,1660],"tags":[],"class_list":["post-5979","post","type-post","status-publish","format-standard","hentry","category-chemistry","category-unit-05"],"acf":[],"yoast_head":"\nThe spontaneity of chemical reactions - Learning & Education Portal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astan.lk\/al_virtualclassroom\/chemical-actions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The spontaneity of chemical reactions - Learning & Education Portal\" \/>\n<meta property=\"og:description\" content=\"\u2022 Entropy of a system is a measure of the randomness of the system. \u2022 Entropy is a function of state and it depends only on the initial and final state of the system and is independent of the path of the change. \u2022 Entropy is also a factor affecting both chemical and physical changes. 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