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Energy changes in reactions (Precipitation = low activation energy,…
Energy changes in reactions
Precipitation = low activation energy
Neutralisation reaction = low activation energy
Combustion reaction = high activation energy
EXOTHERMIC REACTION PROFILE
ENDOTHERMIC REACTION PROFILE
when bonds are being broken, energy is ABSORBED. This is an endothermic reaction
when bonds are being made, energy is being RELEASED. It is an exothermic reaction.
Exothermic reaction
Endothermic reaction
MORE energy released breaking bonds in reactants than forming bonds in products
MORE energy released making bonds in products than BREAKING BONDS in reactants
Bond energy
Avogadro's Number
1 mole = 6.022 x 10^23
Bond energy = energy needed to break 1 mole of a covalent bond
Bond energy calculations
Calculate the number of bonds and bond energy on reactants side
Calculate the number of bonds and bond energy on products side
Energy change = energy in - energy out