Lecture 6: Phases And Heat Capacities

Question 1

Heat capacity (C)

Answer 1

1. C=q/T=heat added to a system/temperature
2. Types of heat capacities
   2a. Constant volume heat capacity (Cv): U=q
   2b. Constant pressure heat capacity (Cp): U=q+w

Question 2

Specific heat capacity

Answer 2

1. Equation: q=MC△T

Question 3

Specific heat of water

Answer 3

4 KJ/(kg*K)

Question 4

Calorimeter

Answer 4

1. Relies on heat capacity to measure heat of a reaction

Question 5

Bomb calorimeter

Answer 5

1. Measures heat of combustion

Question 6

Phase diagrams

Answer 6

1. Represents the phases of a substance at different pressures and temperatures
   1a. Triple point: point where substance is at eqm with all phases
   1b. Critical temperature

Question 7

Phase change: heat curve

Answer 7

1. Heat of fusion: melting
2. Heat of vaporization: boiling

Question 8

Extra

Question 9

4 colligative properties of a solution

Answer 9

1. Vapor pressure lowering: adding nonvolatile solute
2. Boiling point elevation: adding nonvolatile solute
   2a. △T=kmi
   2b. Vant Hoffman factor (i): number of particles which a single solute will dissociate into
3. Freezing point depression: occurs when impurities are added
   3a. △T=kmi
4. Osmotic pressure: pressure distance
   4a. Osmotic pressure=n=iMRT