01. Energetics

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9 Terms

1
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What are the 2 forms of energy we look at in AS?

Heat (form of kinetic) and chemical (form of potential)

2
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What does the triangle refer to?

Change in conditions

3
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What does the H refer to?

Stored energy content (usually heat) of a chemical system

4
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What does ΔH refer to?

Change in heat content

5
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What is a chemical system?

The reactants and products (surroundings are everything other than the system)

6
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What does theta mean?

Substances must be in their normal states under standard conditions

7
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What are the standard conditions?

1) Conc. of 1dm3 for aqueous solutions 2) Pressure of 1 atmosphere 3) A stated temperature, 289k (25 degrees c) usually

8
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What is ΔHθ

Enthalpy -> Change in energy content during a reaction under standard conditions

9
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What is ΔHθ measured in?

kJ mol-1