Enthalpy Changes

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15 Terms

1
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Sum

(sigma)

2
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Conductivity

requires free moving charged particles

-delocalised e-

-ions

MUST BE WRITTEN EXACTLY

3
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Endothermic phase changes

-melting

-boiling/evaporation

-sublimation

(solid > gas)

4
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Exothermic Defn

heat is released to the surroundings

5
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Exo

6
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Exothermic phase changes

-Freezing

-Condensation

-Reverse Sublimation

(gas>solid)

7
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<img src="https://knowt-user-attachments.s3.amazonaws.com/c593fe6b-7566-43e7-914d-4493ed9911d1.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p></p>
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= Hp-Hr

= a negative no

8
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=Hp-Hr

= a positive no

9
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Bond forming?

Endo/Exo?

Exo

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Bond breaking?

Endo/Exo?

Endo

11
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<img src="https://knowt-user-attachments.s3.amazonaws.com/49000aef-ac11-40ba-94bb-7b40c4e164a1.png" data-width="100%" data-align="center" alt="knowt flashcard image"><p>Endo/Exo?</p>
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Endo/Exo?

Endo

12
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Endothermic defn

Heat is absorbed from its surroundings

13
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Test tube feels cold

Endo/Exo?

Endo

14
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Test tube feels hot

Endo/Exo?

Exo

15
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Enthalpy

The total energy (of a substance including all forms)