Energetics

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  • Created by: Nushu
  • Created on: 26-03-18 12:07
What is the law of thermodynamics
energy ca neither be created , nor destroyed it can only be changed from one form to another
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what is meant by enthalpy?
Enthalpy is the measure of the heat content of a substance at constant pressure.
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What does the enthalpy of a substance depend on ?
1) Physical state of the substance 2) Amount of substance 3)Temperature an Pressure
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What is meant by an Exothermic reaction ?
Reactions in which energy is required in order to break bonds.
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What is meant by an Endothermic reaction ?
Reactions in which energy is LOST to the surroundings in order to from new bonds
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What is meant by a standard enthalpy of formation ?
The enthalpy change that occurs when one mole of a substance is formed from its elements in their standard states under standard conditions.
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What is meant by the standard enthalpy of atomization?
The enthalpy change that occurs when one mole of gaseous atoms are formed from the elements in its standard states under standard conditions.
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What is bond enthalpy or bond dissociation enthalpy?
The enthalpy change that occurs when one mole of a bond in a gaseous molecule is broken to form individual atoms
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What is the enthalpy of combustion ?
It is the enthalpy change that occurs when one mole of a substance is completely burnt in excess oxygen under standard states under standard conditions.
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What is the standard enthalpy of neutralization?
When one mole of water is formed in a reaction between an acid an alkali under standard conditions.
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What is the standard enthalpy of reaction?
Is the enthalpy change that occurs when the number of moles of the substances in the equation reacts under standard conditions.
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Card 2

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what is meant by enthalpy?

Back

Enthalpy is the measure of the heat content of a substance at constant pressure.

Card 3

Front

What does the enthalpy of a substance depend on ?

Back

Preview of the front of card 3

Card 4

Front

What is meant by an Exothermic reaction ?

Back

Preview of the front of card 4

Card 5

Front

What is meant by an Endothermic reaction ?

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