9.3-9.5

Question 1

Calorimetry

Answer 1

method to measure heat absorbed or
released in a chemical reaction/process

Question 2

pure gas at exactly

Answer 2

1 atm presssure

Question 3

The standard enthalpy change, H°,

Answer 3

is the enthalpy change when all
reactants and products are in their standard states

Question 4

Enthalpy at Standard States

Answer 4

• pure gas at exactly 1 atm pressure
• pure solid or liquid in its most stable form at exactly
  1 atm pressure and temperature of interest, usually 25 °C
• substance in a solution with concentration of 1 M