1 This graph can be divided into 3 distinct regions, Identify them and explain what is occurring in each segment.

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Presentation transcript:

1 This graph can be divided into 3 distinct regions, Identify them and explain what is occurring in each segment.

2 Sketch shape if: 1.) The beaker had double the amount of ice and water

3 Sketch shape if: 1.) The hot plate was set to half power instead of full

4 Sketch shape if: 1.) Alcohol was used instead of water

5 Phase Changes!

6 Theoretical Results

7 Latent Heat – Energy per unit mass added or removed during a phase change L = Q/m Q = mL Latent heat of fusion Latent heat of vaporization

8 Energies 1 g of ice takes 333 J to melt. 1 g of water takes J to increase by 1 O C. 1 g of water takes 2,260 J to vaporize into steam

9 How many Joules of energy are needed to melt 157 g of ice? Q = mL M = 157 g L = 333 J/g Q = 157 g (333 J/g) Q = J

10 Specific Heat Capacity Amount of heat required to raise temperature of 1 gram by 1 degree.

11 Heat capacity varies for different materials MaterialJ/g o C Water4.186 Air1.005 Aluminum.900 Steel.448 Asphalt.920 Wood1.700 Lead.128 Hydrogen(gas)14.3

12 Specific Heat Capacity Specific heat capacity = C p Energy transferred as heat = Q Mass = m Change in temperature = ΔT

13 -System placed in insulated container of water. -Wait until it reaches thermal equilibrium Heat lost by Sample = Heat gained by Water Calorimetry Q sample = -Q water Cp sample M sample ΔT sample = -Cp water M water ΔT water

14 A.5 kg bolt at unknown temp is dropped into a calorimeter containing.15 kg of water with T i of 21.0 o C. The system reaches a final temperature of 25.0 o C. If the metal has a heat capacity of 899 J/kg o C, find the initial Temp of the metal.

15 A.225 kg sample of tin at 97.5 o C is dropped into.115 kg of water. The water has a T i of 21.0 o C. If the tin has a heat capacity of 230 J/kg o C, find the final equilibrium temperature of the system?