{"id":1567,"date":"2016-03-15T10:30:47","date_gmt":"2016-03-15T10:30:47","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/?page_id=1567"},"modified":"2016-03-15T10:30:47","modified_gmt":"2016-03-15T10:30:47","slug":"exercise-1_2c-mcq4-help-card","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsechchemu1hwrk\/exercise-1_2c-mcq4-help-card\/","title":{"rendered":"Exercise 1_2C MCQ4 Help Card"},"content":{"rendered":"\n\n\n
\"LO1_A10\"<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n\n\n\n
\"Untitled<\/a><\/td>\n <\/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