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Hess's law

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by

Harvey Buckle

on 27 July 2018

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Transcript of Hess's law

Aim
SL/HL To know the definition of Hess's law
SL/HL To be able to apply it to related calculations
SL/HL To plan a Hess's law practical
Starter
How far?
What does THAT mean?
Hess's Law is saying that if you convert reactants A into products B, the overall enthalpy change will be exactly the same whether you do it in one step or two steps or however many steps.
Hess''s Law
The enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs.
Hess's law
27th July 2018
Full transcript