1.4 Energetics

Question 1

What is enthalpy change?

Answer 1

The heat change under certain pressures and conditions

Question 2

Endothermic

Answer 2

Takes in energy (+∆H)

Question 3

Exothermic

Answer 3

Gives out energy (-∆H)

Question 4

Enthalpy of Combustion

Answer 4

Enthalpy change when 1 mole of a substance is completely burned in oxygen under standard states and conditions with all reactants and products in their standard states

Question 5

Enthalpy of Reaction

Answer 5

Enthalpy change when a reaction occurs in the molar quantities shown in the chemical equation under standard states and conditions with all reactants and products in their standard states

Question 6

Enthalpy of Formation

Answer 6

Enthalpy change when 1 mole of a compound is formed from its elements under standard states and conditions with all reactants and products in their standard states

Question 7

Standard Condition

Answer 7

100 KPa, 298K

Question 8

Mean Bond Enthalpy

Answer 8

Average energy per mole to break bond between two atoms

Question 9

Calculate Heat Loss

Answer 9

Q=MC∆T
Q-KJ/mol
M-Mass
C-Specific Heat Capacity
∆T- Change in Temp

Question 10

Hess’ Law

Answer 10

The total enthalpy change for a reaction is independant of the route taken