chemistry 8.1 - enthalpy changes
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13 Terms
What does enthalpy change mean?
Change in heat energy in a reaction at a constant pressure
What is the unit for enthalpy change?
KJ mol^-1
What are standard conditions?
100 KPa (1 atm), 298 K, elements in their standard states
Are endothermic reactions enthalpy changes positive or negative?
Positive
What does less enthalpy of a substances mea in terms of its stability?
More stable
What do enthalpy level diagrams show?
Relative energies of the reactants and products of a reaction
What do reaction profile diagrams show?
How enthalpy changes throughout a reaction
How can you find enthalpy changes?
By conducting experiments or looking in data books
What are enthalpy changes affected by?
Temperature and pressure
What is standard enthalpy change of reaction (ΔrH⊖)?
The enthalpy change when a reaction occurs in its molar quantities shown in the chemical reaction, under standard conditions
What is standard enthalpy change of formation (ΔfH⊖)?
The enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions
What is standard enthalpy change of combustion (ΔcH⊖)?
The enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions
What is standard enthalpy change of neutralisation (ΔneutH⊖)?
The enthalpy change when an acid and an alkali react under standard conditions to form 1 mole of water
Note 
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