Chemistry › Section P · Thermodynamics › Topic P.1
Spontaneity
Thermochemistry tells you how much heat a change gives out or takes in, but not whether the change will happen at all. Thermodynamics answers that second question, and it begins with a simple observation: many changes run one way on their own and never run back.
In this topic
- Which way will it go?
- Spontaneous and nonspontaneous processes
- Spontaneous does not mean fast
- Is giving out heat the answer?
- The dispersal of matter
- The dispersal of energy
- Worked example: an instant cold pack
- Worked example: reading dispersal
- Common mistakes to avoid
- Key takeaways
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