{"id":14014,"date":"2016-01-24T20:12:46","date_gmt":"2016-01-24T20:12:46","guid":{"rendered":"http:\/\/www.oracletutoring.ca\/blog\/?p=14014"},"modified":"2016-01-24T20:18:32","modified_gmt":"2016-01-24T20:18:32","slug":"chemistry-why-a-reaction-proceeds-from-left-to-right","status":"publish","type":"post","link":"https:\/\/www.oracletutoring.ca\/blog\/chemistry-why-a-reaction-proceeds-from-left-to-right\/","title":{"rendered":"Chemistry: why a reaction proceeds from left to right"},"content":{"rendered":"

The tutor explains why a reaction goes forward.<\/h1>\n

Consider, from my previous post,<\/a> the following reaction:<\/p>\n

C3<\/sub>H8<\/sub> + 5O2<\/sub>\u21923CO2<\/sub>+4H2<\/sub>0,   \u0394H=-2219 kJ\/mol<\/p>\n

This reaction proceeds from left to right because, by so doing, it follows nature’s two preferred trends:<\/p>\n

    \n
  1. Entropy rises (for a definition of entropy, see my post here<\/a>).<\/li>\n
  2. Enthalpy falls (for a definition of enthalpy, see my post here<\/a>).<\/li>\n<\/ol>\n

    At a glance, the rise in entropy can be noticed by the increase in molecules from left to right (6 to 7). The fall in enthalpy is indicated by the negative \u0394H value.<\/p>\n

    A chemical transformation that produces, simultaneously, a rise in entropy and a fall in enthalpy, will be spontaneous: once started, it will self-sustain.<\/p>\n

    Source:<\/p>\n

    docbrown.info<\/a><\/p>\n

    Mortimer, Charles E. Chemistry<\/u>, 6th ed. Belmont: Wadsworth, 1986.<\/p>\n

    Jack of Oracle Tutoring by Jack and Diane,<\/a> Campbell River, BC.<\/p>\n","protected":false},"excerpt":{"rendered":"

    The tutor explains why a reaction goes forward. Consider, from my previous post, the following reaction: C3H8 + 5O2\u21923CO2+4H20,   \u0394H=-2219 kJ\/mol This reaction proceeds from left to right because, by so doing, it follows nature’s two preferred trends: Entropy rises …<\/p>\n

    Chemistry: why a reaction proceeds from left to right<\/span> Read More »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[1366,548,1259,1364,1365,1363,1361,1362],"class_list":["post-14014","post","type-post","status-publish","format-standard","hentry","category-chemistry","tag-decrease-in-enthalpy","tag-enthalpy","tag-entropy","tag-fall-in-enthalpy","tag-increase-in-entropy","tag-rise-in-entropy","tag-spontaneous-chemical-reaction","tag-why-a-chemical-reaction-proceeds-forward-spontaneously"],"_links":{"self":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/14014","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/comments?post=14014"}],"version-history":[{"count":22,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/14014\/revisions"}],"predecessor-version":[{"id":14036,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/posts\/14014\/revisions\/14036"}],"wp:attachment":[{"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/media?parent=14014"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/categories?post=14014"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oracletutoring.ca\/blog\/wp-json\/wp\/v2\/tags?post=14014"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}