{"id":1489,"date":"2016-03-14T14:45:21","date_gmt":"2016-03-14T14:45:21","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/?page_id=1489"},"modified":"2016-03-15T10:20:13","modified_gmt":"2016-03-15T10:20:13","slug":"exercise-1_2a-w9-help-card","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/exercise-1_2a-w9-help-card\/","title":{"rendered":"Exercise 1_2A W9a(i) Help Card"},"content":{"rendered":"\n\n\n
\"LO1_A10\"<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n
\"Picture35\"<\/a><\/td>\nEnthalpy is the term used in Chemistry for the chemical potential energy of a substance (there is a slight difference between the two measures, but for Higher this difference can be ignored). It is given the symbol H<\/strong>. <\/a>It is not possible to directly measure the enthalpy of a chemical, however during a chemical reaction, the enthalpy change can be measured in kilojoules (kJ). The enthalpy change<\/strong> is given the symbol \u0394H<\/strong>.<\/p>\n

The enthalpy change is calculated from the difference in enthalpy between the enthalpy of the products (Hp<\/sub><\/span><\/sub>) and the reactants (Hr<\/sub>)<\/span><\/sub>.<\/p>\n

\u0394H = Hp<\/sub> – Hr<\/sub><\/strong><\/h2>\n

The calculation is product minus reaction, which means that enthalpy changes can be positive or<\/strong><\/em> negative. If the enthalpy change for one mole<\/strong> of substance is calculated, then the enthalpy change is expressed in kJ.mol-1<\/sup><\/strong>. Enthalpy change can be calculated from the potential energy diagram.<\/p>\n

The activation energy (EA<\/sub>) is the energy required to form the activated complex.\u00a0 It is calculated form the difference between the highest point on the curve and the enthalpy of the reactants (for the forward reaction).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"Picture7\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

  Enthalpy is the term used in Chemistry for the chemical potential energy of a substance (there is a slight difference between the two measures, but for Higher this difference can be ignored). It is given the symbol H. It is not possible to directly measure the enthalpy of a chemical, however during a chemical … Continue reading “Exercise 1_2A W9a(i) Help Card”<\/span><\/a><\/p>\n","protected":false},"author":2454,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1489","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/wp-json\/wp\/v2\/pages\/1489","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/wp-json\/wp\/v2\/users\/2454"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/wp-json\/wp\/v2\/comments?post=1489"}],"version-history":[{"count":3,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/wp-json\/wp\/v2\/pages\/1489\/revisions"}],"predecessor-version":[{"id":1563,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/wp-json\/wp\/v2\/pages\/1489\/revisions\/1563"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/wp-json\/wp\/v2\/media?parent=1489"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}