Entropy & Direction of Change
- Created by: Hannah
- Created on: 13-12-12 19:53
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- Entropy & the Direction of Change
- 'Number of ways'
- The more ways an event can occur, the more likely it is to happen
- Substances always tend to mix unless there is something stopping them
- E.g
- Strong attractive forces holding one set of molecules together
- Therefore they can't easily break away from each other & mix
- Strong attractive forces holding one set of molecules together
- E.g
- Substances always tend to mix unless there is something stopping them
- Events that happen are the ones that are most likely to
- The more ways an event can occur, the more likely it is to happen
- Entropy
- A measure of the number of ways a chemical system can be arranged
- Higher entropy if...
- More spread-out
- More mixed up
- More disordered
- Its a gas over a liquid or solid
- Molecules in gas arranged in completely random order
- Its a liquid over a solid
- The more crystalline, regular the structure of a solid, the lower the entropy
- E.g. Diamond
- The more crystalline, regular the structure of a solid, the lower the entropy
- A larger molecule compared to a smaller one
- S
- Predicting entropy change in a reaction
- Entropy of products will be greater than reactants if...
- Solids -> liquids -> gases
- More moles of gaseous products than reactants
- Entropy of products will be greater than reactants if...
- Untitled
- 'Number of ways'
- S
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