chemical energetics part 1

Question 1

standard enthalpy change of formation

Answer 1

enthalpy change when 1 mole of substance is formed from its constituent elements in their standard states under standard conditions

Question 2

standard enthalpy change of combustion

Answer 2

enthalpy change when 1 mole of substance is completely burnt in oxygen under standard conditions

Question 3

standard enthalpy change of neutralisation

Answer 3

enthalpy change when 1 mole of water is formed from the reaction of an acid and an alkali under standard conditions

Question 4

1st IE

Answer 4

enthalpy change when 1 mole of electrons is removed from 1 mole of gaseous atoms

Question 5

1st EA

Answer 5

enthalpy change when 1 mole of gaseous atoms accepts 1 mole of electrons

Question 6

lattice energy

Answer 6

enthalpy change when 1 mole of solid ionic compound is formed from its constituent gaseous ions under standard conditions

Question 7

standard enthalpy change of atomisation

Answer 7

enthalpy change when 1 mole of gaseous atoms is formed from the element in its standard state under standard conditions

Question 8

bond energy

Answer 8

enthalpy change when 1 mole of covalent bonds between atoms in a gaseous molecule is broken

Question 9

standard enthalpy change of hydration

Answer 9

enthalpy change when 1 mole of gaseous atoms is hydrated under standard conditions

Question 10

standard enthalpy change of solution

Answer 10

enthalpy change when 1 mole of solution is dissolved in enough solvent under standard conditions, so that no further enthalpy change takes place on adding more solvent