Definitions

Question 1

Law of Conservation of Energy

Answer 1

Energy can neither be created nor destoryed. It can be changed from one form to another, and exchanged between a system and its surroundings.

Question 2

Definition of Atomization: endothermic or exothermic

Answer 2

atomization is the formation of gaseous atoms from a substance, bonds must be broken
endothermic

Question 3

What is bond enthalpies

Answer 3

energy need to break 1 mol bonds

Question 4

Standard enthalpy change of neutralization

Answer 4

Standard enthalpy change of neutralization between a base and an acid ( Delta H ^ theta n ) is the enthalpy change when 1 mole of water is formed from the neutralization of specified acid and base under standard conditions.

Question 5

Standard enthalpy change of combustion

Answer 5

Standard enthalpy change of combustion of a substance (ΔΗ°c) is the enthalpy change involved when 1 mole of the substance is completely burnt in oxygen under standard conditions.

Question 6

Standard enthalpy change of formation

Answer 6

Standard enthalpy change of formation of a substance (Delta * H ^ 0 * t) the enthalpy change for the formation of 1 mole of the substance from its elements in their standard states under standard conditions

Question 7

Hess’s Law

Answer 7

The total enthalpy change of a chemical reaction is independent of the route by which the reaction takes place.