Enthalpy Changes

Question 1

For exothermic reaction what happens to the enthalpy change and where is energy transferred

Answer 1

Decreases (negative enthalpy change )
Energy transferred from system to surroundings

Question 2

For endothermic reaction what happens to the enthalpy change and where is energy transferred

Answer 2

Increase (positive enthalpy change )
Energy transferred from surroundings to system

Question 3

Describe a enthalpy profile diagram for exothermic reaction

Answer 3

Question 4

Describe a enthalpy profile diagram for a endothermic reaction

Answer 4

Question 5

What are the standard conditions for temp

Answer 5

298K

Question 6

What are the standard conditions for pressure

Answer 6

100kpa

Question 7

What are the standard conditions for all solutions

Answer 7

1.00moldm-3

Question 8

What is standard enthalpy change of a reaction

Answer 8

The enthalpy change for a given reaction in the molar quantities shown in the equation

Question 9

Standard enthalpy of combustion

Answer 9

The enthalpy change when 1 mol of substance completely combusts at 298K and 100Kpa

Question 10

What is standard enthalpy of formation

Answer 10

The enthalpy change when 1 mol of a compound is formed from its elements at 298K and 100Kpa

(0 )

Question 11

What is standard enthalpy change of neutralisation

Answer 11

The enthalpy change when 1 mol of H2O is formed from reaction of H+ and OH- at 298K and 100Kpa