energetics AS

Question 1

standard enthalpy of combustion

Answer 1

enthalpy change when one mole of a substance is burnt completely in oxygen, under standard conditions.

Question 2

enthalpy of atomisation

Answer 2

enthalpy change when one mole of gaseous atoms are formed from the element in its standard state under standard condition

Question 3

std enthalpy of solution

Answer 3

enthalpy change when one mole of a substance is dissolved in large amount of water under standard conditions

Question 4

enthalpy of hydration

Answer 4

enthalpy change when one mole of gaseous ions are added to a large amount of water under standard conditions

Question 5

heat of neutralization

Answer 5

energy change when one mole of H+ ions from an acid combines with one mole of OH- ions from a base in aqueous solution to give one mole of water under standard conditions.

Question 6

bond energy

Answer 6

enthalpy change when one mole of a given bond is broken to give gaseous atoms

Question 7

first ionisation

Answer 7

energy required to remove the outer most electron from each atom in one mole gaseous atoms of an element

Question 8

second ionisation

Answer 8

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

Question 9

first electron affinity

Answer 9

energy released when one electron is added to each atom in one mole of gaseous atoms of an element

Question 10

lattice enthalpy

Answer 10

energy released when one mole of solid lattice is formed from gaseous ions under standard conditions

Question 11

hess’s law

Answer 11

states that the overall enthalpy change for a given reactions is independent of the path taken.

Question 12

standard enthalpy of formation

Answer 12

enthalpy change when one mole of a substance is formed from its elements in their standard states, understandard condition

Question 13

activation energy

Answer 13

the minimum energy each molecule should have to take part in the reaction