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CALORIMETRY. https://www.youtube.com/watch?v=1tBkPxrQ9dQ.

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Presentation on theme: "CALORIMETRY. https://www.youtube.com/watch?v=1tBkPxrQ9dQ."— Presentation transcript:

1 CALORIMETRY

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4 https://www.youtube.com/watch?v=1tBkPxrQ9dQ

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6 CALORIMETRY Measurement of heat flow into/out of a system

7 HEAT FLOW TREND Heat always flows from warmer objects to colder objects (until both are equal)

8 Hand touches a hot piece of steel Hand touches a cold piece of steel

9 CHEMICALLY THIS CAN TAKE PLACE ALSO Chemical Potential Energy: energy stored in chemical bonds

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12 DIFFERENT REACTIONS PRODUCE DIFFERENT TYPES OF ENERGY RELEASE/ABSORBTION

13 ENDOTHERMIC System GAINS heat and surrounding cool down

14 EXOTHERMIC SYSTEM LOSES HEAT AS THE SURROUNDING HEAT UP

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17 HEAT CAPACITY HOW MANY LAYERS DO YOU REQUIRE TO STAY COMFORTABLE (TOASTY WARM)

18 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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21 SPECIFIC HEAT HEAT REQUIRED TO RAISE 1 GRAM OF A SUBSTANCE EXACTLY 1*C CPCP

22 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?

23 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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26 SPECIFIC HEAT REFERENCE TABLE

27 HOW DO WE FIND HOW MUCH HEAT ENERGY? q = mC p T

28 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?

29 What is the specific heat of Ice? (reference) Liquid water? (reference)

30 WHEN WOULD I USE THIS

31 SR-71 2,200 MPH

32 RESEARCH – DEFINITION AND 3 REAL-LIFE EXAMPLES Heat of Fusion Heat of Vaporization


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