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Chemistry Year 2 Revision > Thermodynamics > Flashcards

Thermodynamics Flashcards

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1
Q

what is enthalpy change?

A

the heat energy transferred in a reaction at constant pressure

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2
Q

what are the standard conditions?

A

100 kPa
298 K

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3
Q

do exothermic reactions have a negative or positive enthalpy change value?

A

negative

heat energy is given out

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4
Q

do endothermic reactions have a negative or positive enthalpy change value?

A

positive

heat energy is absorbed

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5
Q

what is lattice formation enthalpy?

A

the enthalpy change when 1 mole of a solid ionic compound is formed from its gaseous ions

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6
Q

what is lattice dissociation enthalpy?

A

the enthalpy change when 1 mole of a solid ionic compound is completely dissociated into its gaseous ions

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7
Q

what is enthalpy change of formation?

A

the enthalpy change when 1 mole of a compound is formed from its elements in their standard states

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8
Q

what is bond dissociation enthalpy?

A

the enthalpy change when all the bonds of the same type in 1 mole of gaseous molecules are broken

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9
Q

what is enthalpy change of atomisation of an element?

A

the enthalpy change when 1 mole of gaseous atoms is formed from an element in its standard state

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10
Q

what is enthalpy change of atomisation of a compound?

A

the enthalpy change when 1 mole of a compound in its standard state is converted to gaseous atoms

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11
Q

what is the first ionisation energy?

A

the enthalpy change when 1 mole of gaseous 1+ ions is formed from 1 mole of gaseous atoms

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12
Q

what is the second ionisation energy?

A

the enthalpy change when 1 mole of gaseous of 2+ ions is formed from 1 mole of gaseous 1+ ions

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13
Q

what is first electron affinity?

A

the enthalpy change when 1 mole of gaseous 1- ions is made from 1 mole of gaseous atoms

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14
Q

what is second electron affinity?

A

the enthalpy change when 1 mole of gaseous 2- ions is made from 1 mole of gaseous 1- ions

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15
Q

what is enthalpy change of hydration?

A

the enthalpy change when 1 mole of aqueous ions is formed from gaseous ions

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16
Q

what is enthalpy change of solution?

A

the enthalpy change when 1 mole of an ionic substance dissolves in enough solvent to form an infinitely dilute solution

17
Q

what is Hess’s Law?

A

the total enthalpy change of a reaction is always the same, no matter which route is taken

Chemistry Year 2 Revision (11 decks)

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