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Module 5: Enthalpoy And Entropy

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

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#1
Front (Question)

Definitions What is enthalpy of formation

Back (Answer)

Enthalpy change when one mole of a substance is formed from its elements in their standard state

#2
Front (Question)

Definitions What type of energy change is enthalpy of formation

Back (Answer)

Exothermic for most

#3
Front (Question)

Definitions Equation for enthalpy of formation for sodium oxide

Back (Answer)

2Na(s) + 1/2 O2(g) —> Na2O(s)

#4
Front (Question)

Definitions What is enthalpy of combustion

Back (Answer)

Enthalpy change when one mole of a substance undergoes complete combustion with all substances in their standard states

#5
Front (Question)

Definitions What type of energy change is enthalpy of combustion

Back (Answer)

Exothermic

#6
Front (Question)

Definitions What is the equation for combustion of ethane

Back (Answer)

C2H6 + 7/2 O2 —> 2 CO2 + 3 H2O

#7
Front (Question)

Definitions What is enthalpy of neutralisation

Back (Answer)

Enthalpy change when one mole of water is formed in a reaction between an acid and alkali under standard conditions

#8
Front (Question)

Definitions What energy change is enthalpy of neutralisation

Back (Answer)

Exothermic usually -57

#9
Front (Question)

Definitions Equation for enthalpy of neutralisation for sulfuric acid and sodium hydroxide

Back (Answer)

1/2 H2SO4 (aq) + NaOH (aq) —> 1/2 H2SO4 (aq) + H2O (l)

#10
Front (Question)

Definitions What is the first ionisation energy

Back (Answer)

Enthalpy Chang when one mole of gaseous atoms loses one mole of electrons to form one mole of gaseous 1- ions

#11
Front (Question)

Definitions What type of reaction is first ionisation energy

Back (Answer)

Endothermic

#12
Front (Question)

Definitions Equation for first ionisation energy of magnesium

Back (Answer)

Mg(g) —> Mg+ (g) + e-

#13
Front (Question)

Definitions What is second ionisation energy

Back (Answer)

Enthalpy can change when one mole of gaseous 1+ ions loses one. Ole of electrons to form one mole of gaseous 2+ ions loses

#14
Front (Question)

Definitions What energy change is second ionisationnnenegry

Back (Answer)

Endothermic

#15
Front (Question)

Definitions Equation for second ionisation energy for magnesium

Back (Answer)

Mg+(g) —> Mg2+ (g) + e-

#16
Front (Question)

Definitions What is the first electron affinity

Back (Answer)

Enthalpy change when one mole of gaseous atoms gains one mole of electrons to form one mol of 1- ions

#17
Front (Question)

Definitions What type of energy change is first electron affinity

Back (Answer)

Exothermic for many non metals

#18
Front (Question)

Definitions Equations for first electron affinity of oxygen

Back (Answer)

O(g) + e- —> O-(g)

#19
Front (Question)

Definitions What is second electron affinity

Back (Answer)

Enthalpy Change when one mole of gaseosus 1– ions gains one mole of electrons to form one mole of gaseous 2- ions

#20
Front (Question)

Definitions What type of energy change is second electron affinity and why

Back (Answer)

Endothermic as adding negative electrons to a negative ion so some repulsion

#21
Front (Question)

Definitions Equation for second electron affinity of oxygen

Back (Answer)

O- (g) + e- —> O2- (g)

#22
Front (Question)

Definitions What is enthalpy of atomisation

Back (Answer)

Enthalpy change when one mole of gaseous atoms is produced from an element in its standard state

#23
Front (Question)

Definitions What type of energy change is enthalpy of atomisation

Back (Answer)

Endothermic

#24
Front (Question)

Definitions Equation for enthalpy of atomisation of iodine

Back (Answer)

1/2 I2 (s) —> I (g)