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A level Chemistry > enthalpy changes and born haber module 5 > Flashcards

enthalpy changes and born haber module 5 Flashcards

1
Q

what is enthalpy change of formation

A

when 1 mole of a compound is formed from its elements

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2
Q

what is enthalpy change of atomisation of an element

A

1 mole of gaseous atoms formed from an element

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3
Q

what is the enthalpy change of atomisation of a compound

A

1 mole of a compound is converted to gaseous atoms

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4
Q

what is the First ionisation energy

A

energy needed to remove 1 mole of electrons from 1 mole of gaseous 1+ ions

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5
Q

what is the second ionisation energy

A

energy needed to change 1 mole of gaseous 1+ ions into 1 mole of gaseous 2+ ions

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6
Q

what is the 1st electron affinity

A

energy needed to change 1 mole of gaseous atoms into 1 mole of gaseous 1- ions

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7
Q

what is the 2nd electron affinity

A

energy needed to change 1 mole of gaseous 1- ions into 1 mole of gaseous 2- ions

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8
Q

what is lattice enthalpy

A

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

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9
Q

what is the enthalpy change of hydration

A

enthalpy change when 1 mole of gaseous ions is dissolved in water

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10
Q

what is the enthalpy change of solution

A

enthalpy change when 1 mole of solute is dissolved in a solvent e.g water

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11
Q

what factors affect enthalpy of hydration

A

ionic charge and ionic radius
smaller ions and higher charge = better at attracting water molecules

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12
Q

what is entropy

A

a measure of disorder in a system/dispersal of energy in a system

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13
Q

what happens to entropy as you go from a solid to a gas

A

it increases

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14
Q

how do you calculate the entropy of a system

A

entropy of products - entropy of reactants

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15
Q

what is free energy change used to predicf

A

whether a reaction is feasible

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16
Q

what types of reactions are feasible

A

only exothermic

17
Q

why might a reaction still not be feasible even if it is exothermic

A

might have a really high activation energy or slow rate of reaction

18
Q

how does ionic charge affect lattice enthalpy

A

Higher the charge , the stronger the electrostatic attraction so more energy is released when the ionic lattice is formed which means it is more negative

19
Q

how does ionic radius affect lattice enthalpy

A

smaller ionic radii = higher charge density and more electrostatic attraction makes it more exothermic

20
Q

how

A
20
Q

how does ionic charge affect the enthalpy of hydration

A

Higher charge = Higher enthalpy of hydration
better at attracting water molecules and more energy is released when bonds are made which is more exothermic

20
Q
A
21
Q
A

A level Chemistry (11 decks)

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