energetics

Question 1

what is the equation to calculate an energy change

Answer 1

q=mc(change in T)
where q= heat energy change
m=mass of surrounding
c=specific heat capacity of surrounding 
T=temperature

Question 2

what is the standard enthalpy change of reaction

Answer 2

the enthalpy change that accompanies a reaction in the molar quantities shown in a chemical equation under standard conditions, with all reactions and products in the standard state

Question 3

what is the standard enthalpy change of formation

Answer 3

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

Question 4

what is the enthalpy change of combustion

Answer 4

the enthalpy change when 1 mole of a compound is completely burnt in oxygen under standard conditions

Question 5

what is the standard enthalpy change of neutralisation

Answer 5

the energy change that accompanies the reaction of an acid by a base to form one mole of water under standard conditions with all reactants and products in standard conditions

Question 6

define average bond enthalpy

Answer 6

the mean amount of energy required to break one mole of a specified type of covalent bond in a gaseous molecules