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Published byArlene Austin Modified over 8 years ago
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CALORIMETRY
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https://www.youtube.com/watch?v=1tBkPxrQ9dQ
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CALORIMETRY Measurement of heat flow into/out of a system
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HEAT FLOW TREND Heat always flows from warmer objects to colder objects (until both are equal)
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Hand touches a hot piece of steel Hand touches a cold piece of steel
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CHEMICALLY THIS CAN TAKE PLACE ALSO Chemical Potential Energy: energy stored in chemical bonds
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DIFFERENT REACTIONS PRODUCE DIFFERENT TYPES OF ENERGY RELEASE/ABSORBTION
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ENDOTHERMIC System GAINS heat and surrounding cool down
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EXOTHERMIC SYSTEM LOSES HEAT AS THE SURROUNDING HEAT UP
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HEAT CAPACITY HOW MANY LAYERS DO YOU REQUIRE TO STAY COMFORTABLE (TOASTY WARM)
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HEAT CAPACITY Heat required to increase temperature of an object exactly 1*C: depends on mass and composition Heat measured in joules (J) or Calories
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SPECIFIC HEAT HEAT REQUIRED TO RAISE 1 GRAM OF A SUBSTANCE EXACTLY 1*C CPCP
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WATER OR STEEL IF YOU HELD ONTO A STEEL NAIL FOR 1 MINUTE. THEN STUCK YOUR HAND IN A CUP OF WATER FOR 1 MIN. WHICH WOULD HEAT UP QUICKER? STAY WARMER LONGER?
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CONSERVATION OF ENERGY If we gain X amount of heat at a certain rate, then we must lose the heat at the same rate!
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SPECIFIC HEAT REFERENCE TABLE
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HOW DO WE FIND HOW MUCH HEAT ENERGY? q = mC p T
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When 435J of heat is added to 3.4 g of olive oil at 21*C, temp raises to 85*C. What is the specific heat of the olive oil?
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What is the specific heat of Ice? (reference) Liquid water? (reference)
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WHEN WOULD I USE THIS
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SR-71 2,200 MPH
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RESEARCH – DEFINITION AND 3 REAL-LIFE EXAMPLES Heat of Fusion Heat of Vaporization
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