A-Level Chemistry(Need Help)

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Direction matters a lot as per your definitions, for instance formation means from the elements, so your arrows point from the elements to the substance you form.

For combustion, you combust the substance to their combusting products, so that definition means your arrow for the enthalpy change points towards the combustion products.

etc. Check out my A Level chemistry topical playlist for chemical energetics, amongst many other topical playlists ranging from AS to A level topics. Subscribe and share the channel with friends, class chat groups, juniors/seniors from school, teachers if useful, please. Cheers.

 
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