physical definitions A2

Question 1

Define lattice enthalpy of formation

Answer 1

• formation of 1 mole of a solid ionic lattice
• from its gaseous ions

Question 2

Is lattice enthalpy of formation exo or endo?

Answer 2

exo

Question 3

Define enthalpy change of atomisation

Answer 3

• enthalpy change when 1 mole of gaseous atoms
• is formed from its elements
• in its standard state

Question 4

Is enthalpy change of atomisation exo or endo?

Answer 4

endo

Question 5

Define electron affinity

Answer 5

• enthalpy change when 1 mole of electrons
• is added to 1 mole
• of gaseous atoms

Question 6

Is electron affinity endo or exo?

Answer 6

1st electron affinity = exo
2nd electron affinity = endo

Question 7

Define enthalpy change of solution

Answer 7

• enthalpy change when 1 mole
• of a solute in its standard state
• dissolves in a solvent

Question 8

Define enthalpy change of hydration

Answer 8

• enthalpy change when 1 mole of gaseous ions
• are dissolved in water
• and are converted into aqueous ions

Question 9

Is enthalpy change of hydration exo or endo?

Answer 9

always exo

Question 10

Define standard molar entropy

Answer 10

• entropy of 1 mole of a substance
• under standard conditons