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A Level Chemistry- KE > Energetics II > Flashcards

Energetics II Flashcards

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1
Q

what is lattice energy?

A

the energy change when one mole of an ionic solid is formed from its gaseous ions under standard conditions (298K 100kPa)

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2
Q

what is enthalpy change of atomisation, ΔatH?

A

Enthalpy change when 1 mole of gaseous atoms is formed from the elements in its standard states. Always endothermic.

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3
Q

what is electron affinity?

A

the energy change when each atom in one mole of atoms in the gaseous state gains an electron to form a -1 ion

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4
Q

what is lattice energy a measure of?

A

ionic bond strength

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5
Q

what is ‘enthalpy change of solution, ΔsolH?

A

enthalpy change when one mole of solute dissolves in water

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6
Q

what is ‘enthalpy
change of hydration, ΔhydH’?

A

enthalpy change when one mole of gaseous ions dissolves in water

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7
Q

if lattice energy is more negative what does this imply?

A

the ionic bonding of the compound is strong

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8
Q

what is the unit for entropy?

A

K-1 mol-1

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9
Q

what is the formula for entropy change in the surroundings?

A

∆ S surroundings = -∆sol H/T

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10
Q

what is the formula for ΔStotal?

A

ΔS total = ΔS system + ΔS surroundings

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11
Q

what is the formula for charge density?

A

charge/volume

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12
Q

what is the formula or free energy?

A

ΔG = ΔH – TΔS

ΔG is the change in free energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy

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13
Q

what must the value of ΔG be in order for a reaction to be feasible?

A

zero or negative (the more negative the more feasible)

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14
Q

if ΔH is negative and ΔS is positive will the reaction be feasible?

A

Yes because ΔG will be negative

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15
Q

if ΔH is positive and ΔS is negative will the reaction be feasible?

A

No because ΔG will be positive

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16
Q

what does polarising power of a cation depend on?

A

radius and charge

17
Q

what is entropy?

A

a measure of disorder in a system

18
Q

if there is a high level of disorder what will the entropy value be?

A

large and positive

19
Q

what does polarisability of a anion depend on?

A

its radius and charge

20
Q

why is the second electron affinity endothermic?

A

because you are adding an electron to an already negative ion– requires energy to overcome repulsion forces

21
Q

higher polarisation and distortion results in?

A

more covalent character

22
Q

what are the units for entopy?

A

JK-1mol-1

23
Q
A

A Level Chemistry- KE (15 decks)

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