Enthalpy changes defiinition

Question 1

define standard enthalpy change of reaction

Answer 1

enthalpy change when the reaction occurs in the molar quantities shown in the chemical reaction, under standard conditions.

Question 2

define standard enthalpy change of formation

Answer 2

enthalpy change when 1 mol of a compound is formed from its elements in their standard states, under standard conditions

Question 3

define standard enthalpy change of combustion

Answer 3

is the enthalpy change when 1 mol of a substance is completely burned in oxygen under standard conditions

Question 4

define standard enthalpy change of neutralisation

Answer 4

the enthalpy change when an acid and an alkali react together under standard conditions to form 1 mol of water