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Welcome Back Minions

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

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  1. Welcome Back Minions Time to get to work!

  2. 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 • Kelvin Scale • 0° • Matter stops moving!

  3. Math Time!!! • Conversions between Temperature Scales: • °C = (°F – 32) • °F = °C + 32 • K = °C + 273

  4. 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

  5. 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.

  6. 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.

  7. 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

  8. Need some Heat…

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

  10. Final Math… • Change in energy… How much heat is required to raise the temperature of 5kg of water by 10K?

  11. Compare And Contrast

  12. 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?

  13. Homework… Chapter 14 Section 2 Pages 479-483 (Don’t forget the vocabulary!)

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