Enthalpy Changes

Question 1

Hydration

Answer 1

One mole gaseous ions are completely dissolved in water under standard conditions

Question 2

Solution

Answer 2

One mole of a solute is completely dissolved in water under standard conditions

Question 3

Formation

Answer 3

One mole of a substance in its standard state is formed from its elements in their standard states under standard conditions

Question 4

Lattice Enthalpy

Answer 4

One mole of a compound in its standard state is formed from its ions in a gaseous state

Question 5

Electron Affinity

Answer 5

One electron is added to each atom of one mole of gaseous atoms

Question 6

Ionisation

Answer 6

One electron is removed from each atom in one mole of gaseous atoms

Question 7

Atomisation

Answer 7

One mole of gaseous atoms are formed from their elements in their standard states

Question 8

Two Enthalpy Equations

Answer 8

q=mCpT (q in Joules)

H=-q/mol (q in kiloJoules)

Question 9

Combustion

Answer 9

One mole of a substance in its standard state reacts completely with oxygen under standard conditions to form a product in its standard state

Question 10

Factors of Entropy (What is this??? Not Enthalpy?? U bastard!)

Answer 10

Temperature - High means greater entropy
State - s/l/g -> Greater entropy
Complexity - More complex means greater entropy
Amount - More moles means greater entropy

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Question 11

Neutralisation

Answer 11

Energy released by the formation of one mole of water when an acid reacts with an alkali

Question 12

Bond Making/Breaking

Answer 12

Making - Releases Energy Exothermic

Breaking - Absorbs Energy Endothermic