Chapt 11: Thermal Properties of Matter

Question 1

What are the 2 types of internal energy?

Answer 1

1. Internal KE
   - Due to motion of particles
   - Affects temperature
   -> Higher the temp, the more vigorously the particles move, hence higher KE
2. Internal PE
   - Due to stretching/compressing of intermolecular or interatomic bonds as particles move
   - Amt of PE stored depends on
   -> the forces between particles
   • > how far they are
     - Correlates to change of state of substance

Question 2

What is heat capacity?

Answer 2

Definition: The amt of thermal energy needed to raise the temp of a substance by 1 K (or 1°C).

- SI unit: Joules per Kelvin (JK	⁻¹) or Joules per degree Celsius (J °C⁻¹)

Question 3

What is specific heat capacity?

Answer 3

Definition: The amt of thermal energy required to raise the temperature of a unit mass (eg. 1kg) of substance by 1K or 1°C.

- SI unit: Joule per Kilogram per Kelvin (J kg ⁻¹ K ⁻¹) or Joule per Kilogram per degree Celsius (J kg ⁻¹ °C ⁻¹)