Unit 2 Notes- Heat and Energy- Komperda
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Unit 2 Notes- Heat and Energy- Komperda

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Unit 2 Notes- Heat and Energy- Komperda Unit 2 Notes- Heat and Energy- Komperda Presentation Transcript

  • Energy & Heat Tuesday Sept. 9 th , 2008
  • Energy
    • Energy is the ability to do work
    • Energy exists in many different forms
      • Can you think of any?
        • Kinetic Energy
        • Potential Energy
        • Chemical Energy
        • Thermal Energy
        • Nuclear Energy
        • Sound Energy
        • Light Energy
    • Law of Conservation of Energy- energy cannot be created or destroyed, it simply changes forms
  • Chemical Energy
    • Energy within matter due to its chemical makeup.
    • Chemical reactions convert chemical energy to other forms of energy (light, heat, etc.)
    • Examples?
      • Batteries
      • Food
  • Kinetic Energy
    • Energy of motion
    • How is this different from potential energy?
    • Particles (atoms) are always in motion. They have kinetic energy
  • Heat
    • Heat is the sum of the kinetic energy of the particles in a sample
    • Temperature is the measurement of heat.
    • Temperature is a measure of the average kinetic energy of the particles in a sample
    • http://intro.chem.okstate.edu/1314F00/Laboratory/GLP.htm
    • Watch what happens to the particles as the temperature is increased
  • Endothermic & Exothermic
    • An ex othermic reaction feels hotter because heat is ex iting the reaction.
      • Heat is moving from the system (the reaction) to the surroundings (your hand)
    • An en dothermic reaction feels colder because heat is en tering the reaction.
      • Heat is moving from the surroundings (your hand) to the system (the reaction)
    • THERE IS NO SUCH THING AS COLD IN SCIENCE CLASS!!! ONLY HEAT CAN MOVE!
  • How would you convert from Celsius to Kelvin??
  • Specific Heat Capacity
    • The amount of heat energy required to raise the temperature of 1 g of a substance by 1 ºC.
    • The specific heat of water is 1.00 cal / g ºC
      • 1000 cal = 1 Calorie (from your nutrition labels)
    • The specific heat of water is 4.184 J/ g ºC
      • Both Jules (J) and calories (cal) are units of energy
  • Comparing Heat Capacities
    • Given:
    • The heat capacity of water is 4.184 J/g ºC
    • The heat capacity of copper is 0.385 J/g ºC
    • Which one requires more Jules to raise the temperature of 1 gram 1 ºC ?
    • Does this mean that water feels hotter faster or slower than copper?
  • Energy and Temperature During a Phase Change
    • As energy is increasing what is happening to temperature? (blue)
    • Why might energy increase but temperature stay constant? (green)