Welcome Back Minions

WELCOME BACK MINIONSTime 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

NEED SOME 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…

• Change in energy…

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

COMPARE AND CONTRAST

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 14Section 2

Pages 479-483(Don’t forget the vocabulary!)