Hi, please could i have help on this question? I understand why statements 1 and 2 are correct but i don’t get why 3 is correct? If the reaction is exothermic, surely the enthalpy of products should be greater so when you subtract the enthalpy of the reactants from the products, you get a negative number which means it s exothermic? Here is the question: https://app.gemoo.com/share/image-annotation/614490829553283072?codeId=MlQwqlp9VqKJY&origin=imageurlgenerator
Hi, please could i have help on this question? I understand why statements 1 and 2 are correct but i don’t get why 3 is correct? If the reaction is exothermic, surely the enthalpy of products should be greater so when you subtract the enthalpy of the reactants from the products, you get a negative number which means it s exothermic? Here is the question: https://app.gemoo.com/share/image-annotation/614490829553283072?codeId=MlQwqlp9VqKJY&origin=imageurlgenerator
Thank you so much!
If you draw an energy/enthalpy diagram for an exothermic reaction, you'll see that the enthalpy of the products is less than that of the reactants. This means that energy is lost from the system – given out as heat. enthalpy of products - enthalpy of reactants The enthalpy has decreased, hence the negative value for ΔH. https://www.chemguide.co.uk/physical/energetics/basic.html
If you draw an energy/enthalpy diagram for an exothermic reaction, you'll see that the enthalpy of the products is less than that of the reactants. This means that energy is lost from the system – given out as heat. enthalpy of products - enthalpy of reactants The enthalpy has decreased, hence the negative value for ΔH. https://www.chemguide.co.uk/physical/energetics/basic.html