1. Chemistry Notes
Calorimetry

2. Calorimetry is the science of measuring heat change.
You can use the specific heat of something you know to find the specific heat of something you don’t know.

3. This concept takes advantage of the law of conservation of energy.
The principal shows that heat lost by one substance has to equal heat gained by another.

4. What happens when a hot object is put into cool water?
50g
Object at 100oC
heat lost by object is
also heat gained by water
Final temperature of both is 22oC
50g
Water at 20oC
250g

5. Heat lost is equal to heat gained, but temperature lost does NOT equal temperature gained

6. To find the specific heat of an object…
Solve q=mCDT for heat gained by water
THEN
Use q you found to solve q=mCDT for the specific heat of the object.

7. A calorimeter is a device that measures heat change.
It can be extremely sophisticated, or as simple as two foam cups, a thermometer and water!

8. Bomb Calorimeter

9. KCHS Style Calorimeter

10. Practice Problem #1
What is the specific heat of a metal if a 50.8g sample at 100.0oC raises the temperature of 258.2g of water from 25.2oC to 28.1oC?

11. Practice Problem #2
What is the specific heat of a substance if a 22.6g sample at 104.5oC raises the temperature of 125.3g of water from 22.6oC to 33.1oC?