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Thermodynamics

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Total cards: 13•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (13)

#1
Front (Question)

Define standard enthalpy of atomisation

Back (Answer)

The enthalpy change when mole of gaseous atoms is formed from the element in its standard state under standard conditions

#2
Front (Question)

Define first electron affinity

Back (Answer)

The standard enthalpy change when one mole of gaseous atoms is converted into one mole of gaseous ions, each with a single negative charge

#3
Front (Question)

Define second electron affinity

Back (Answer)

The enthalpy change when mole of electrons is added to one mole of gaseous ions, each with a single negative charge to form one mole of gaseous ions each with 2 negative charges

#4
Front (Question)

Define first ionisation energy

Back (Answer)

The standard enthalpy change when one mole of gaseous atoms is converted into one mole of gaseous ions each carrying a single positive charge

#5
Front (Question)

Is first ionisation energy an endo- or exothermic reaction?

Back (Answer)

Endothermic

#6
Front (Question)

Is first electron affinity an endo- or exothermic reaction?

Back (Answer)

Exothermic

#7
Front (Question)

Is second electron affinity an endo- or exothermic reaction?

Back (Answer)

Endothermic

#8
Front (Question)

Why is second electron affinity endothermic?

Back (Answer)

Involves bringing together 2 negative charges - naturally these want to repel

#9
Front (Question)

What should you look for in entropy changes?

Back (Answer)

Look out for the number of moles on the reactants and products side. Also look out for state changes.

#10
Front (Question)

What suggests an increase in entropy change?

Back (Answer)

If the total number of moles of the reactants is less than the number of moles of the products. If a state change is experienced. Entropy increases in this general order: solid -> liquid -> aqueous -> gas

#11
Front (Question)

What suggests a decrease in entropy change?

Back (Answer)

If the total number of moles of the reactants is more than the total number of moles of the products. If a state change is experienced. Entropy decreases in this general order: gas -> aqueous -> liquid -> solid

#12
Front (Question)

What is the equation for gibbs free energy?

Back (Answer)

G = H-TS

#13
Front (Question)

What is the enthalpy of lattice dissociation?

Back (Answer)

Enthalpy of lattice dissociation is the standard enthalpy change when one mole of an ionic crystal lattice form is separated into its constituent ions in gaseous form.