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

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Heat naturally flows from high temperature to low temperature.
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Presentation transcript:

CALORIMETRY

CALORIMETRY Measurement of heat flow into/out of a system

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

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

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

DIFFERENT REACTIONS PRODUCE DIFFERENT TYPES OF ENERGY RELEASE/ABSORBTION

ENDOTHERMIC System GAINS heat and surrounding cool down

EXOTHERMIC SYSTEM LOSES HEAT AS THE SURROUNDING HEAT UP

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

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

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

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?

CONSERVATION OF ENERGY If we gain X amount of heat at a certain rate, then we must lose the heat at the same rate!

SPECIFIC HEAT REFERENCE TABLE

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

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?

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

WHEN WOULD I USE THIS

SR-71 2,200 MPH

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

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