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Chemistry A2 > Thermodynamics > Flashcards

Thermodynamics Flashcards

1
Q

Define lattice formation of enthalpy

A

Enthalpy change when 1 mole of a solid ionic compound is formed from its gaseous ions

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2
Q

Define lattice dissociation enthalpy

A

Enthalpy change when 1 mole of a solid ionic compound is completely dissociated into its gaseous ions

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3
Q

What does a big difference in theoretical and experimental enthalpy change tell you?

A

Shows ionic bonds are strongly polarised with a large degree of covalency

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4
Q

Enthalpy change of formation

A

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

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5
Q

Bond dissociation enthalpy

A

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

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6
Q

Enthalpy change of atomisation of an element

A

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

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7
Q

Enthalpy change of atomisation of a compound

A

Enthalpy change when 1 mole of a compound in its standard state is converted to gaseous atoms

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8
Q

1st ionisation energy

A

Enthalpy change when 1 mole of gaseous 1+ ions is formed from 1 mole of gaseous atoms

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9
Q

2nd ionisation energy

A

Enthalpy change when 1 mole of gaseous 2+ ions is formed from 1 mole of gaseous 1+ ions

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10
Q

1st electron affinity

A

Enthalpy change when 1 mole of gaseous 1- ions is formed from 1 mole of gaseous atoms

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11
Q

2nd electron affinity

A

Enthalpy change when 1 mole of gaseous 2- ions is made from 1 mole of gaseous 1- ions

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12
Q

Enthalpy change of hydration

A

Enthalpy change when 1 mole of aqueous ions is formed from gaseous ions

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13
Q

Enthalpy change of solution

A

Enthalpy change when 1 mole of an ionic substance dissolves enough solvent to form an infinitely dilute solution

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14
Q

Define entropy

A

The measure of the disorder of a system

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15
Q

Equation for S, entropy change

Unit?

What does a positive value for Ssystem tell you?

A

Ssystem = Sprod - Sreac

JK-1mol-1

Right side of the reaction is favoured

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16
Q

What happens to entropy of temperature decreases?

If moles increase?

A

Entropy decreases

Entropy increase

17
Q

Define free energy change

A

Energy available for work, predicting whether reaction is feasible

18
Q

Equation for free energy change, G

Unit?

A

G = H - TS

H = enthalpy change, T = temp (K), S = entropy

19
Q

What value of G is required for a reaction to be feasible?

A

G = 0 or less

20
Q

Equation for total enthalpy change of a reaction

A

H = Hprod - Hreac (AS equation)

21
Q

How do u you find the temperature at which a reaction becomes feasible?

A

Make G = 0 and rearrange for T in the equation, G = H -TS

Chemistry A2 (8 decks)

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