CIE Topic 5 Chemical Energetics REVISION 

When thinking about breaking bonds and making bonds, you can use the abbreviation BENDOMEX, (Breaking bonds (B) is endothermic (ENDO) and (Making bonds (M) is exothermic (EX))

I wish these videos were there for me when I gave my A-levels 😢

Thank you so much! This video has literally cleared all my confusion on the topic!! Especially Hess’s Cycle!

From south Africa here u honestly so Great at explaining and make sure not to leave anything out

Bless you, Mr Harris. This has been beyond helpfull.

35:52 i didnt really understand how they should add up to zero? Im quitw lost so could you explain more?

At 43:34 while calculating mean bond enthalpy why had u multiplied 4×413? For C-H bonds?

At 43:23 while calculating mean bond enthalpy i don't get why we only write C(g) + 4H(g) + 4O(g) ,why are we not talking about CO2 and 2O2 ? Please clarify

at 24:00 when finding the enthalpy change of neutralizing by dividing Q by the number of moles..do we usually calculate the number of moles of the acid or the base? why did we choose HCl in this case and not NaOH? I'm aware that in this example both have the same number of moles so it does not matter but what if they have different moles (ex: if we are using a strong acid with a weak base)? please reply, thanks!!!

currently watching this 5 minutes before my mocks 🗣️🗣️🗣️

39:01 why we do not need to take enthalpy of combustion of oxygen?

i wanted to confirm for bond enthalpy, do the arrows always face down or it depends.

is this 9701 syllabus???