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Specific Heat Capacity

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... Specific Heat Capacity The amount of heat it takes to raise the temp. of 1 gram of a substance 1 oC calorimetry = the measurement of ... the temp. of 1 gram of a ... – PowerPoint PPT presentation

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Title: Specific Heat Capacity


1
Specific Heat Capacity
2
Thermochemistry
  • deals with heat changes that occur during
    chemical reactions
  • Heat transfer of energy from one object to
    another

3
  • Endothermic heat flows into the system
  • the test tube gets cold heat is absorbed
  • Exothermic heat flows out of the system
  • the test tube gets hot heat is given off

4
Burning calories
  • 1 calorie quantity of heat needed to raise the
    temperature of 1 gram of water 1 oC
  • Calorie dietary calorie 1,000 calories 1
    kilocalorie
  • 1 Joule (metric unit) 0.239 calories
  • 4.184 Joules 1 calorie
  • 10 g of sugar
  • 41 Calories of heat or
  • 41 kilocalories of heat

5
Heat Capacity
  • the amount of heat needed to increase the
    temperature of an object by 1 oC
  • depends on the mass and chemical composition of
    the matter

iron block
250 gram steel cylinder
50 gram steel cylinder
wooden block
6
Specific Heat Capacity
  • The amount of heat it takes to raise the temp. of
    1 gram of a substance 1 oC
  • calorimetry the measurement of heat changes

7
Some specific heat capacities
Substance J/(gXoC) water
4.18 ice 2.1 aluminum
0.90 glass 0.50 iron
0.46 silver 0.24
8
Calculation of the specific heat of a substance
  • S specific heat
  • q heat
  • m mass
  • ?T change in temperature T2 T1
  • q m S ?T
  • or q m C ?T

9
Some problems!
  • The temperature of a piece of copper with a mass
    of 95.4 g increases from 25.0 oC to 48.0 oC when
    the metal absorbs 849 J of heat. What is the
    specific heat of copper?

S ___q___ m ?T
m 95.4 g ?T (48.0 oC 25.0 oC) 23.0 oC q
849 J
S ______849J_______ 95.4 g X 23.0
oC
0.387 J/(g oC)
10
  • When 435 J of heat is added to 3.4 g of olive oil
    at 21 oC, the temperature increases to 85 oC.
    What is the specific heat of olive oil?

S ____435 J_____ 3.4 g X 64 oC
S 2.0 J/(gX oC)
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