120 likes | 320 Views
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
E N D
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 • Kelvin Scale • 0° • Matter stops moving!
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! • 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… • 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 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… A material with a high specific heat can absorb a great deal of thermal energy without a great change in temperature.
Final Math… • Change in energy… How much heat is required to raise the temperature of 5kg of water by 10K?
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… Chapter 14 Section 2 Pages 479-483 (Don’t forget the vocabulary!)