enthalpy change definitions Flashcards

1
Q

standard conditions

A

100kPa, 298K, 1mol/dm3

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2
Q

First ionisation energy

A

energy change when one mole of electrons is removed from one mole of gaseous ions to form one mole of gaseous 1+ ions. endothermic

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3
Q

first electron affinity

A

energy change when one mole of gaseous atoms gains 1 mole of electrons to form one mole of gaseous 1- ions. exothermic

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4
Q

second electron affinity

A

change in energy when one mole of gaseous 1- ions gain one mole of electrons to form one mole of gaseous 2- ions. endothermic

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5
Q

standard enthalpy change of combustion

A

energy change when one mole of a substance undergoes complete combustion in excess oxygen under standard conditions. exothermic

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6
Q

standard enthalpy change of formation

A

energy change when one mole of an ionic compound if formed from its elements in their standard states under standard conditions. (usually) exothermic

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7
Q

standard enthalpy change of neutralisation

A

enthalpy change when an acid and base are neutralised to form one mole of water, under standard contitions. exothermic

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8
Q

enthalpy change of atomisation

A

energy change when one mole of gaseous atoms are formed from an element in its standard states. endothermic

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9
Q

lattice enthalpy

A

energy change when one mole of an ionic compound if formed from its gaseous ions under standard conditions. exothermic

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10
Q

enthalpy change of hydration

A

energy change when one mole of gaseous ions are dissolved in water to form one mole of aqueous ions. exothermic

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11
Q

enthalpy change of solution

A

energy change when one mole of a compound is completely dissolved in water. can be exo or endothermic

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12
Q

standard enthalpy change of reaction

A

the enthalpy change when a reaction occurs in the molar quantities shown in the chemical equation with all products and reactants in their standard states under standard conditions

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13
Q

entropy

A

measure of the degree of disorder of a system.

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