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7911267
OCR - A-Level - Chemistry - Enthalpy Changes
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A level Chemistry (Module 3) Mind Map on OCR - A-Level - Chemistry - Enthalpy Changes, created by Josh Anderson on 01/03/2017.
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chemistry
module 3
a level
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Josh Anderson
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Josh Anderson
over 7 years ago
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OCR - A-Level - Chemistry - Enthalpy Changes
Enthalpy is the amount of thermal energy stored by chemicals in a system.
Represented as H
ΔH, +ve means it is endothermic
+ve because gaining energy
In endothermic reactions, products have more energy than reactants. Energy taken in from the surroundings.
ΔH, -ve means it is exothermic
-ve because losing energy
In exothermic reactions, products have less energy than reactants. Energy given out to the surroundings.
With a catalyst, activation energy needed is reduced.
Exothermic
Endothermic
A system is the reactants and products.
Standard conditions
100kPa
298K (25 degrees Celsius)
1.0M concentration
Standard state is the most stable physical state of a substance under standard conditions
Magnesium is Mg(s)
Hydrogen is H2(g)
Water is H2O(l)
Enthalpy change of reaction
Balanced chemical equation
Enthalpy change of formation
Only 1 mole of the product
Enthalpy change of combustion
Only 1 mole of the fuel substance
Enthalpy change of neutralisation
Only 1 mole of water
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