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entropy and enthalpy

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

give the definition for lattice enthalpy

Back (Answer)

the energy released when one mole of an ionic compound/lattice is formed from its gaseous ions

#2
Front (Question)

define enthalpy change of formation

Back (Answer)

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

#3
Front (Question)

are lattice enthalpies exothermic or endothermic and why?

Back (Answer)

exothermic - involves the formation of bonds which releases energy

#4
Front (Question)

is enthalpy change of formation endo or exothermic

Back (Answer)

can be both

#5
Front (Question)

define enthalpy change of atomisation

Back (Answer)

the energy required to form 1 mole of gaseous atoms from an element in its standard state

#6
Front (Question)

is enthalpy change exo or endo thermic

Back (Answer)

always endothermic

#7
Front (Question)

define enthalpy change of first ionisation energy

Back (Answer)

the energy required to remove 1 mole of electrons from one mole of gaseous atoms to form 1 mole of gaseous ions with a +1. charge

#8
Front (Question)

is enthalpy change of first ionisation energy exo or endothermic

Back (Answer)

endothermic

#9
Front (Question)

define enthalpy change of second ionisation energy

Back (Answer)

the energy required to remove 1 mole of electrons from one mole of gaseous ions with a 1+ charge to form 1 mole of gaseous ions with a 2+ charge

#10
Front (Question)

define enthalpy change of first electron affinity

Back (Answer)

energy released when 1 mole of gaseous atoms gain 1 mole of electrons to form 1 mole of gaseous ions with a 1- charge

#11
Front (Question)

is enthalpy change of electron affinity endo or exo

Back (Answer)

exothermic

#12
Front (Question)

define enthalpy change of second electron affinity

Back (Answer)

the enthalpy change when 1 mole of gaseous ions gain 1 mole of electrons to form 1 mole of gaseous ions with a 2- charge.

#13
Front (Question)

what is the order for constructing a born harber cycle

Back (Answer)

enthalpy change formation —–> enthalpy change of atomisation —> enthalpy change lattice enthalpy –> enthalpy change electron affinity

#14
Front (Question)

define enthalpy change of solution

Back (Answer)

the enthalpy change when one mole of an ionic compound dissolves in water

#15
Front (Question)

is enthalpy change of solution endo or exothermic

Back (Answer)

endothermic - breaking bonds

#16
Front (Question)

define enthalpy change of hydration

Back (Answer)

energy released when one mole of gaseous ions dissolves in water

#17
Front (Question)

is enthalpy change of hydration exo or endo

Back (Answer)

exothermic

#18
Front (Question)

how do u calculate enthalpy change of solution

Back (Answer)

• (lattice enthalpy) + (enthalpy change of hydration)

#19
Front (Question)

what are the 2 factors affecting lattice enthalpy

Back (Answer)

charge and ionic radius

#20
Front (Question)

what is entropy

Back (Answer)

measure of disorder in a system, highly disordered = high entropy

#21
Front (Question)

as temperature increases what happens to entropy

Back (Answer)

increases, as particles have higher energy so become more disordered

#22
Front (Question)

how do u calculate entropy change

Back (Answer)

(sum of products) - ( sum of reactants)k

#23
Front (Question)

what are the limitations of predictions made by delta G

Back (Answer)

rate is very slow as high activation energy non standard conditions may be used

#24
Front (Question)

what is the definition for standard entropy of a substance

Back (Answer)

the entropy of 1 mol of a substance in JK-1 mol-1 under standard conditions (1 atm 298K)