Chapter 7.3

Question 1

What happens to temperature when thermal energy increases

Answer 1

-the temperature also increases

Question 2

What is the assumption between enthalpy and heat under constant pressure

Answer 2

-that enthalpy is equivalent to heat under constant pressure

Question 3

What is calorimetry used for? What are the two types. Give an example of each

Answer 3

• it is a process of measuring transferred herat
• two types are:
• > constant-pressure calorimetry(coffee-cup calorimeter)
• > constant-volume calorimetry(bomb calorimeter)

Question 4

What are heat capacities

Answer 4

-heat capacities are the multiples of mc in the formula Q=mc(delta T)

Question 5

How much work is done in a bomb calorimeter

Answer 5

• no work is done in a bomb calorimeter

- >there is no change in the water content surrounding the vessel

Question 6

What happens during a phase change in water? Does the temperature increase in the compound

Answer 6

• the temperature does not change

- >all of the heat added is used to overcome the intermolecular forces between the water molecules

Question 7

Describe the makeup of a bomb calorimeter

Answer 7

• sample of matter is placed in the steel decomposition vessel
• > this vessel is filled with pure oxygen gas
• > the decomposition vessel is placed in an insulated container holding a known mass of water
• > the contents of the decomposition vessel are ignited by an electric ignition mechanism
• > the material combusts in the presence of oxygen