Chemistry 2.4 Energetics and enthalpy

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  • Created by: Dan
  • Created on: 28-12-13 13:02
What is enthalpy? State the symbol.
The heat content of a system. H
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What is enthalpy change?
The heat added to a system at constant pressure
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What is the chemical system?
Reactants and products
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What happens to atoms during chemical reactions?
Chemical bonds are broken and reformed changing the state of the atom
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What changes as a result of this?
Chemical energy
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State the principle of conservation of energy.
Energy cannot be created nor destroyed, only changed from one form to another
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How do you work out Enthalpy change?
Enthalpy of Products - Enthalpy of Reactants
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State the 3 main enthalpy change reactions.
Combustion, Formation and Reaction
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State Hess' law
the total enthalpy change for a reaction is independent of the route taken from the reactants to the products
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Other cards in this set

Card 2

Front

What is enthalpy change?

Back

The heat added to a system at constant pressure

Card 3

Front

What is the chemical system?

Back

Preview of the front of card 3

Card 4

Front

What happens to atoms during chemical reactions?

Back

Preview of the front of card 4

Card 5

Front

What changes as a result of this?

Back

Preview of the front of card 5
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