1. qsurroundings = -qsystem
CALORIMETRY
Calorimetry: the science associated with determining the changes in energy of a system by measuring the heat exchanged with the surroundings
the heat lost (-q) by a system equals the heat gained (+q) by the surroundings.
qsurroundings = -qsystem
Remember:
q = Cm∆T

2. A calorimeter is used to measure the amount of heat absorbed or released during a chemical reaction.
We will use a calorimeter that is made out of 2 Styrofoam coffee cups filled with water.
Stirring rod
In this experiment,
Heat gained by the water in the cup = Heat lost by the system
qwater = - qsystem or
mwaterCwater∆Twater = - (msystemCsystem ∆Tsystem)

3. Experimentally Determine Specific Heat
A hot piece of Aluminum that was 0.65g and 105.0°C was placed into a calorimeter containing mL of 23.6°C water. The temperature of the water rose to 25.1°C. If the specific heat of water is J/g°C, determine the specific heat of Aluminum.
qwater = - qaluminum

4. qwater = - qaluminum Water C = 4.186 J/g°C
Mass = g (200.0 mL = g)
∆T = (25.1°C °C)
= 1.5°C
Alumunium
C = ?
Mass = 0.65g
∆T = (25.1°C °C)
= -79.9°C

5. qwater = - qaluminum Cwater x mwater x ∆Twater = - CAl x mAl x ∆TAl
4.186J/g°C x 200.0g x 1.5°C = - C x 0.65g x -79.9°C
-24 J/g°C = - CAl
24 J/g°C = CAl

6. 10. 0 g of metal X at 280. 0 °C is dropped into 200. 0mL of H2O at 20
10.0 g of metal X at °C is dropped into 200.0mL of H2O at 20.0 °C in a coffee cup calorimeter. Metal X and H2O reach thermal equilibrium at 25.0 °C. Calculate the specific heat capacity of X.
1.6 J/g°C

7. A 30.0 g hot piece of lead was dropped into a calorimeter containing 50.0 mL of water at 19.5°C. After reaching equilibrium, the temperature of the water was 27.8°C.
How much energy did the water absorb?
What was the original temperature of the lead?
(C lead = J/g°C)

8. You put a 25. 0 g piece of zinc in a beaker containing 520
You put a 25.0 g piece of zinc in a beaker containing mL of boiling water. You then take the zinc and put it into a calorimeter containing mL of water at 21.7°C. The temperature of the water in the calorimeter rises to 24.3°C. What is the specific heat of zinc?