hess's law

Pia Ricioppo
Mind Map by Pia Ricioppo, updated more than 1 year ago
Pia Ricioppo
Created by Pia Ricioppo about 5 years ago
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Description

aqa as level chemistry unit 2

Resource summary

hess's law
1 the enthalpy change is independent of the route taken, depending only apon the intial and final states of the reactants and products
2 rules for creating a CYCLE.
2.1 1. if its not given in the question you MUST right and equation for the unnown reaction/ enthalpy.
2.1.1 2. you MUST write equations for any given data
2.1.1.1 3. write the unknown (equation) across the top
2.1.1.1.1 4. match up equation to unknowns and check arrows pointing in the right direction
2.1.1.1.1.1 5. CLOCKWISE= ANTICLOCKWISE.
2.1.1.1.1.1.1 6. rearrange and solve!
3 example of a cycle;
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