Enthalpy changes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Enthalphy change of formation | The enthalpy change when 1 mole of a compound is formed from it's constituent elements under standard conditions with all reactants and products in their standard states
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| The bond dissociation enthalpy | The enthalpy change when all the bonds of the same type in 1 mole of gaseous molecules are broken
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| Enthalphy change of atomisation of an element | The enthalpy change when 1 mole of gaseous atoms is formed from an element in its standard state
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| Enthalphy change of atomisation of a compound | The enthalpy change when 1 mole of a compound in its standard state is converted into gaseous atoms
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| The first ionisation enthalpy | The enthalpy change when 1 mole of gaseous 1+ ions is formed from 1 mole of gaseous atoms
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| The second ionisation enthalpy | The enthalpy change when 1 mole of gaseous 2+ ions is formed from 1 mole of gaseous 1+ ions
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| First electron affinity | The enthalpy change when 1 mole of gaseous 1- ions is made from 1 mole of gaseous atoms
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| Second electron affinity | The enthalpy change when 1 mole of gaseous 2- ions is made from 1 mole of gaseous 1- ions
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| The enthalpy of hydration | The enthalpy change when 1 mole of aqueous ions is formed from gaseous ions
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| The enthalpy change of solution | The enthalpy change when 1 mole of solute is dissolved in sufficient solvent that no further enthalpy change occurs on further dilution.
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| Lattice formation enthalpy | The enthalpy change when 1 mole of a solid ionic compound is formed from its gaseous ions under standard conditions
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| Lattice dissociation enthalpy | The enthalpy change when 1 mol of a solid ionic compound is completely dissociated inot its gaseous ions under standard conditions
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| Enthalpy change | Is the heat energy transferred in a reaction at constant pressure
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| Standard conditions | 100kPa 298K 1moldm^3 all substances in their standard states
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| Exothermic reaction | give out energy to surroundings so the products have less energy than the reactants. -ve deltaH
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| Endothermic reaction | take in energy from surroundings so products have more energy than the reactants. +ve deltaH
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| Enthalpy change of combustion | The enthalpy change when 1 mole of a substance is completely burned with oxygen under standard conditions with all reactants and products in their standard states
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| Hess's Law | The enthalpy change is the same independent of the route taken.
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Created by:
Carrie Wong ^.^
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