1. Specific Heat Capacity
Comparing different types of matter!

2. Specific Heat Capacity
Compares how easily the kinetic energy of particles is changed for different materials
Symbol is c
Definition:
Amount of heat needed to raise the temperature of 1 kg of a material 1oC or 1K

3. Specific Heat
Measured with calorimeter

5. Change in Thermal Energy
Thermal energy changes if heat flows into or out of a material
Change in thermal energy = mass x change in temperature x specific heat
Q = m c ΔT

6. Math Skills Activity p 162
The temperature of a 32 g silver spoon increases from 20oC to 60oC. If silver has a specific heat of 235 J/kgK, what is the change in thermal energy?
What we know:
Mass=32g = ? Kg
Starting temperature: 20oC
Ending temperature: 60oC
Specific heat (c ) = 235 J/kgK
Change in temperature:
Ending temperature – starting temperature
ΔT = 60oC – 20oC = 40oC = ? K

7. Math Skills Activity continued
Equation:
Q= m c ΔT
Put values in:
Q = (0.032 kg) ( 235 J/kgK) (40 K)
Solve!
Q = J

8. Practice!
Do the practice problem on page 162.

9. Another problem:
What is the amount of heat energy that must be removed to lower the temperature of 200 g of water from 24oC to 20oC?