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HEAT ENERGY CALCULATIONS

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Presentation on theme: "HEAT ENERGY CALCULATIONS"— Presentation transcript:

1 HEAT ENERGY CALCULATIONS
FEBRUARY 24, 2015

2 SCIENCE STARTER DO THE SCIENCE STARTER TAKE 3 MINUTES
YOU ARE SEATED AND SILENT

3 AIM Can the heat of fusion formula be utilized to calculate the amount of heat required when heating water from 40˚C to 60˚C?

4 SCIENCE STARTER REVIEW
Two pure water samples held in separate containers at 1 atm must have molecules possessing the same average kinetic energy if the samples have the same Volume Temperature Mass Density

5 2. An iron bar at 325K is placed in a sample of water
2. An iron bar at 325K is placed in a sample of water. The iron bar gains energy from the water if the temperature of the water is 65K 45K 65ºC 45ºC

6 3. The boiling point of water at standard pressure is
0.000K 100K 273K 373K

7 4. Which sample of water will have the highest vapor pressure?
10.0 mL at 62ºC 20.0 mL at 52ºC 30.0 mL at 42ºC 40.0 mL at 32ºC

8 4. A mixture of ice and water is in equilibrium at standard pressure
4. A mixture of ice and water is in equilibrium at standard pressure. The temperature of the mixture must be 0ºC 100ºC 212ºC 273ºC

9 REVIEW What is heat energy? What is specific heat capacity?
What is temperature?

10 When would you use the following formula
REVIEW When would you use the following formula q=mCΔT q=mHf q=mHv

11

12

13 What is the amount of heat energy released when 50
What is the amount of heat energy released when 50.0 grams of water is cooled from 20.0˚C to 10.0˚C (Jan 2014 Regent)?

14 What is the total amount of heat released when 1
What is the total amount of heat released when gram of H20 (l) is heated from 50.˚C to 65˚C?

15 A 10. 0 grams sample of H2O (l) at 23. 0˚C absorbs 209 joules of heat
A 10.0 grams sample of H2O (l) at 23.0˚C absorbs 209 joules of heat. What is the final temperature of the H2O (l) sample?

16 q=mCΔT Heat energy q = heat energy (J) m = mass of the substance (g)
C = specific heat capacity (J/g K) ΔT = change in temperature of the substance

17 SUMMARY Today we review
Heat Specific heat capacity Temperature Heat energy formulae You were also introduced to heat energy calculations

18 INDEPENDENT WORK LOG ONTO www.coursesites.com Go to Weekly Assignment
Go to Week of Feb 23 – 27 What you need to complete this week Reading and questions Vocabulary Notecard Homework Project AIM PROMPT – must complete each day

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