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

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

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