Ch 4 Enthalpy Change Flashcards by lemon squezer | Brainscape

Q

State standard conditions

A

25°C or 198 kelvin
101kpa or 10(5) pa
All substances in their natural state

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Q

Enthalpy change if neutralisation

Endo or exo

A

Enthalpy change when 1 mole of hydrogen ion from an acid react with 1 mole of oh from a base to form 1 mole of h2o

Always endo

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Q

Enthalpy change of atomisation

A

Enthalpy change when 1 mole of atoms are formed from their elements under standard conditions

Always endo

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Q

Hess law

A

Enthalpy change for a reaction is same regardless of the path taken

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Q

Enthalapy change of combustion.
Enhalaphy change of formation

Formula

A

Combustion
Reactant - product
Formation
Product - reactant

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