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Welcome Back Minions. Time to get to work!. Review…. Temperature A measure of the average kinetic energy of the individual particles in matter Fahrenheit Scale 0° Brine (seawater) Freezes 32° Water Freezes 212° Water Boils Celsius Scale 0° Water Freezes 100° Water Boils

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welcome back minions

Welcome Back Minions

Time to get to work!

review
Review…
  • Temperature
    • A measure of the average kinetic energy of the individual particles in matter
  • Fahrenheit Scale
      • Brine (seawater) Freezes
    • 32°
      • Water Freezes
    • 212°
      • Water Boils
  • Celsius Scale
      • Water Freezes
    • 100°
      • Water Boils
  • Kelvin Scale
      • Matter stops moving!
thermal energy
Thermal Energy
  • Thermal Energy
    • Total energy of all the particles in an object.
      • Depends on:
        • Number of particles in the object
        • Temperature of the object
        • Arrangement of the object’s particles
        • (learn more in section 3)
  • Which has more Thermal Energy?
    • .5 liter of hot chocolate at 75° C
    • .25 liter of hot chocolate at 75° C
bring on the heat
Bring on the heat!
  • When we talk about heat we may mention that an object contains heat, but in fact it contains Thermal Energy.
    • So what is heat?
  • Why does an ice cube melt in your hand?
  • Heat
    • Thermal Energy moving from a warmer object to a cooler object.
getting specific
Getting specific…
  • Imagine the beach in early summer…
    • Run across the sand… OUCH!!! Feels hot!!!
    • Run into the water… BRRR!!! Feels cold!!!
  • What is going on here?
  • Heat an object = Temperature rises
    • BUT!!! Objects do not heat at the same rate.
    • Depends on the chemical makeup of the object.
getting specific1
Getting specific…
  • Scientist defined a quantity to measure relationship between Heat and Temperature Change.
    • Specific Heat
      • Raise the Temperature of 1 kilogram of a material by 1 Kelvin
        • Joules per Kilogram-Kelvin
specific heat
Specific Heat…

A material with a high specific heat can absorb a great deal of thermal energy without a great change in temperature.

final math
Final Math…
  • Change in energy…

How much heat is required to raise the temperature of 5kg of water by 10K?

closing
Closing…
  • What is the difference between Thermal Energy and Temperature?
  • What is Heat?
  • Which requires more Heat to change Temperature… the sand, or the water at the beach?
homework
Homework…

Chapter 14

Section 2

Pages 479-483

(Don’t forget the vocabulary!)