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Urgent chemistry gcse help !!

Can anyone help me with this ??

Calcium carbonate can be thermally decomposed in the lab, explain in terms of bonds why this is an endothermic reaction ?! PLEASE HELP

Reply 1

astrodr

An endothermic process is a process in which there is an energy input into a system (thus a positive enthalpy change - increase in energy). To break bonds an energy input needs to take place and this is the case in thermal decomposition - the heat (thermal) provides the energy input needed to break the bonds in calcium carbonate, an endothermic process. Because the reaction is endothermic overall, the energy required to break the bonds must be greater than the energy released in making bonds (an exothermic process required to make the bonds in CaO and CO). Therefore, overall the reaction is endothermic.

Hope this helps.

Reply 2

David Lawson

Thanks, this's does, so if it were an exothermic reaction would it just be the opposite ?

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(edited 10 years ago)

Reply 3

astrodr

If it were exothermic, the energy required to make bonds would be greater than the energy required to make bonds, making the reaction of negative enthalpy overall.