lattice enthalpy

Question 1

enthalpy of formation

Answer 1

The enthalpy change that takes place when one mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states.

Question 2

What type of reaction is enthalpy of formation?

Answer 2

exothermic

Question 3

first ionisation energy

Answer 3

the enthalpy change required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions

Question 4

what type of reaction is first ionisation energy

Answer 4

endothermic

Question 5

second ionisation energy

Answer 5

the energy required to remove one electron from each ion in one mole of gaseous 1+ ions of an element to form one mole of gaseous 2+ ions

Question 6

what type of reaction is second ionisation energy?

Answer 6

endothermic as energy is required to overcome attraction between negative electron and positive nucleus

Question 7

first electron affinity

Answer 7

the enthalpy change that takes place when when one electron is added to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions

Question 8

what type of reaction is first electron affinity?

Answer 8

exothermic as the electron being added is attracted in towards the nucleus

Question 9

second electron affinity

Answer 9

enthalpy change that takes place when one electron is added to each ion in one mole of gaseous 1- ions to form one mole of gaseous 2- ions

Question 10

lattice enthalpy

Answer 10

the enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions

Question 11

what reaction is lattice enthalpy

Answer 11

exothermic

Question 12

enthalpy of atomisation

Answer 12

the enthalpy change that takes place when one mole of gaseous atoms is formed from an element in its standard state

Question 13

The first ionisation energy of sodium is more endothermic than that of potassium. Explain why.

Answer 13

Sodium - atomic radius is smaller
- so nuclear attraction increases.

Question 14

The lattice enthalpy of sodium oxide is more exothermic than that of potassium oxide. Explain why.

Answer 14

Na+ is smaller so Na+ has stronger attraction to O2-

Question 15

Enthalpy of hydration.

Answer 15

Enthalpy change when one mole of hydrated/ aqueous ions are formed.
Gaseous ions dissolve in water.

Question 16

Enthalpy of solution

Answer 16

Enthalpy change for one mole of a compound/ substance/ solid dissolving in water.