8. Thermodynamics

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Total cards: 24•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

What is enthalpy change?

Back (Answer)

The heat energy transferred in a reaction at constant pressure

Front (Question)

Symbol for enthalpy change?

Back (Answer)

ΔH

Front (Question)

What is standard enthalpy change?

Back (Answer)

The heat energy transferred in a reaction at 100kPa and 298K

Front (Question)

What does the sign on an enthalpy change value depend on?

Back (Answer)

Whether the reaction is exothermic or endothermic

Front (Question)

What does a negative enthalpy change value indicate?

Back (Answer)

The reaction is exothermic

Front (Question)

What does a positive enthalpy change value indicate?

Back (Answer)

The reaction is endothermic

Front (Question)

What is standard enthalpy change of formation?

Back (Answer)

Enthalpy change when 1 mole of substance is formed from its constituent elements with all reactants and products in standard states under standard conditions

Front (Question)

What is standard enthalpy change of combustion?

Back (Answer)

Enthalpy change when 1 mole of a substance is completely burned in oxygen with all reactants and products in standard states under standard conditions

Front (Question)

How is enthalpy change calculated in terms of the sum of bonds broken and formed?

Back (Answer)

sum of bonds broken - sum of bonds formed

#10

Front (Question)

What is the equation for enthalpy of formation of sodium oxide?

Back (Answer)

2Na (s) + 1/2 O₂ (g) → Na₂O (s)

#11

Front (Question)

What is the ΔH sign for enthalpy of formation?

Back (Answer)

Positive or negative

#12

Front (Question)

What is the ΔH sign for enthalpy of combustion?

Back (Answer)

Negative

#13

Front (Question)

What is the equation for the enthalpy of combustion of hydrogen?

Back (Answer)

H₂ (g) + 1/2 O₂ (g) → H₂O (l)

#14

Front (Question)

What is ionisation enthalpy also known as?

Back (Answer)

First/second etc. ionisation energy

#15

Front (Question)

What is first ionisation energy?

Back (Answer)

Enthalpy change when each atom in one mole of gaseous atoms loses one electron to form one mole of gaseous 1+ ions

#16

Front (Question)

What is second ionisation energy?

Back (Answer)

Enthalpy change when each ion in one mole of gaseous 1+ ions loses one electron to form one mole of gaseous 2+ ions

#17

Front (Question)

What is first electron affinity?

Back (Answer)

Enthalpy change when each atom in one mole of gaseous atoms gains one electron to form one mole of gaseous 1- ions

#18

Front (Question)

What is second electron affinity?

Back (Answer)

Enthalpy change when each ion in one mole of gaseous 1- gains one electron to form one mole of gaseous 2- ions

#19

Front (Question)

What is the ΔH sign for ionisation enthalpy?

Back (Answer)

Positive

#20

Front (Question)

What is the ΔH sign for first electron affinity?

Back (Answer)

Negative

#21

Front (Question)

What is the ΔH sign for second electron affinity?

Back (Answer)

Positive

#22

Front (Question)

What is the equation for enthalpy of first ionisation energy of magnesium?

Back (Answer)

Mg (g) → Mg⁺ (g) + e⁻

#23

Front (Question)

What is the equation for enthalpy of second ionisation energy of magnesium?

Back (Answer)

Mg⁺ (g) → Mg²⁺ (g) + e⁻

#24

Front (Question)

What is the equation for first electron affinity of oxygen?

Back (Answer)

O (g) + e⁻ → O⁻(g)