2 - Energetics

Question 1

Enthalpy Change

Answer 1

The overall energy exchanged with the surroundings when a change happens at constant pressure and the final temperature is the same as the starting temperature.

Question 2

Specific Heat Capacity

Answer 2

The energy needed to raise the temperature of 1g of the material by 1K.

Question 3

Standard enthalpy change of a reaction

Answer 3

The enthalpy change when the number of moles of the substances as stated in the equation react under standard conditions.

Question 4

The standard enthalpy change of neutralization

Answer 4

The enthalpy change when 1 mol of water is produced by the neutralization of a solution of an acid by excess base under standard conditions, with all concentrations 1 mol/dm(3).

Question 5

Standard enthalpy change of combustion

Answer 5

The enthalpy change when one mole of the substance burns completely in oxygen under standard conditions.

Question 6

Standard enthalpy change of formation

Answer 6

The enthalpy change when one mole of the compound forms from its elements under standard conditions with the elements and the compound in their standard states.

Question 7

Standard enthalpy change of atomization

Answer 7

The enthalpy change when one mole of gaseous atoms is formed from the element under standard conditions.

Question 8

Hess Law

Answer 8

The enthalpy change in converting reactants to products is the same regardless of the route taken, provided the initial and final conditions are the same.

Question 9

Bond enthalpy

Answer 9

The energy required to break one mole of the bonds in a substance in the gaseous state.