3.1.8 Thermodynamics Flashcards

1
Q

(ΔHf)

A

Enthalpy of formation
The enthalpy change when 1 mole of a compound is formed from its elements
in their standard states.

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2
Q

(ΔHdiss)

A

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

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3
Q

(ΔHat)

A

Enthalpy of atomisation
The enthalpy change when 1 mole of
gaseous atoms is formed from an
element in its standard state.

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4
Q

(ΔHie1)

A

First ionisation energy
The enthalpy change when 1 mole of
gaseous 1+ ions is formed from 1 mole of gaseous atoms.

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5
Q

(ΔHie2)

A

2nd ionisation energy
The enthalpy change when 1 mole of
gaseous 2+ ions is formed from 1 mole
of gaseous 1+ ions.

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6
Q

(ΔHea1)

A

1st electron affinity
The enthalpy change when 1 mole of
gaseous 1- ions is made from 1 mole of
gaseous atoms.

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7
Q

(ΔHea2)

A

2nd electron affinity
The enthalpy change when 1 mole of
gaseous 2- ions is made from 1 mole of
gaseous 1- ions.

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8
Q

(ΔHhyd)

A

Enthalpy change of hydration
The enthalpy change when 1 mole of
aqueous ions is formed from gaseous
ions.

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9
Q

(ΔHsolution)

A

Enthalpy change of solution
The enthalpy change of solution refers to the amount of heat that is released or absorbed during the dissolving process (at constant pressure).

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10
Q

(ΔHlattice) dissosciation

A

Lattice dissociation enthalpy
The enthalpy change when 1 mole of a
solid ionic compound is completely
dissociated into its gaseous ions.

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11
Q

(ΔHlattice) formation

A

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

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12
Q

Is enthalpy of formation ENDO OR EXO

A

EXO

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13
Q

BOND DISSOSCIATION ENERGY - endo or exo

A

Endo

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14
Q

Atomization ENDO OR EXO

A

ENDO

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15
Q

Ionisation energy 1 and 2 endo or exo

A

ENDO

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16
Q

1st electron affinity ENDO OR EXO (EXPLAIN)

A

EXOTHERMIC- energy is released when adding an electron to an atom

17
Q

2nd electron affinity ENDO OR EXO (EXPLAIN)

A

ENDO it requires energy to add an electron to a negative ion because the negative charges repel

18
Q

Enthalpy of hydration ENDO OR EXO

A

EXO

19
Q

Enthalpy of solution ENDO OR EXO

A

EITHER

20
Q

ΔH latt disc endo or exo

A

endo

21
Q

ΔH latt form endo or exo

A

exo

22
Q

Define entropy

A

A measurement of disorder in a system

23
Q

How do you calculate entropy change

A

ΔS° = ΣS°(products) - ΣS°(reactants)

24
Q

What are the units of entropy

A

J K mol-1

25
Q

What are the units of enthalpy

A

kJ K mol-1

26
Q

How do you calculate Gibbs free energy

A

ΔG° = ΔH° - TΔS°

27
Q

What does it mean if a reaction is feasible

A

It will happen

28
Q

What does it mean if a reaction is spontaneous

A

A reaction will happen without ‘prompt’ (excluding Ea barrier)

29
Q

What does the value of G have to be for a reaction to be feasible

A

0 or below

30
Q

What are the units of Gibbs free energy

A

kJ mol-1

31
Q
A