Topic 8 Energetics I

Question 1

Standard Conditions for pressure and temperature

Answer 1

100 kPA, 298 K

Question 2

Endothermic Reaction

Answer 2

Overall positive enthalpy change. Products final > Reactants final enthalpy. number is positive

Question 3

Exothermic Reaction

Answer 3

Overall negative enthalpy change. Products final enthalpy< reactants final ethalpy. number is negative

Question 4

Enthalpy level diagram

Answer 4

Doesnt have activation energy

Question 5

Reaction profile diagram

Answer 5

Has activation energy

Question 6

standard enthalpy change of formation

Answer 6

The enthalpy change that takes place when 1 mole of a compound is formed from its elements in their standard states under standard conditions.

Question 7

Standard enthalpy change of reaction

Answer 7

the enthalpy change that takes place in a reaction in molar quantities shown under standard conditions, with all reactants and products in their standard states

Question 8

Standard enthalpy change of combustion

Answer 8

The energy change that takes place when 1 mole of a substance is completely reacted with oxygen under standard conditions, with everything in standard state

Question 9

Standard enthalpy change of neutralisation

Answer 9

The enthalpy change that takes place when one mole of water is formed during a neutralisation reaction under standard conditions.

Question 10

Energy Transferred expression

Answer 10

Mass x Specific Heat Capacity x temperature change

Question 11

How to get in kj/mol

Answer 11

-q/moles

Question 12

Water Specific heat capacity

Answer 12

4.18

Question 13

Average bond enthalpy

Answer 13

The mean energy required to break 1 mole of bonds in gaseous molecules