Everything is made up of molecules

Everything is made up of molecules•Imagine how many molecules you consist

of!

•The average adult consists of one thousand trillion trillion molecules!

States of Matter•States of matter•Solid > Low energy•Liquid > Medium energy•Gas > High energy

•Determined by how much energy and there heat molecules have

State Changes and Heat

Exit Card•Based on what you learned today about

molecules and heat, why do you think your doors get harder to close in the summer and easier to close in the winter?

What is Heat?•Heat is energy in the form of molecular

movement!

Temperature•Temperature is how we measure heat

•Temperature is how we measure molecular movement

How a thermometer works• As the temperature gets

hoter the molecules in the red liquid move faster

• The red liquid expands, which we see as the red line getting longer

• Most thermometers follow a similar idea

Kelvin Scale•Like Celsius but added 273 degrees

• 0◦Celcius is equal to 273 Kelvins

•20◦Celcius is equal to ___ Kelvins

•-273◦Celcius is equal to ___ Kelvins

Kelvin Scale•At -273◦Celcius or ____ Kelvins

•There is absolutely no molecular movement

•The molecules are completely still!

•This is called absolute zero

•Also the reason why we use the Kelvin scale in science

Exit card 2

•If heat is the movement of molecules, then how would you describe cold? Is there such thing as cold energy?

Heat transfer summary

Conduction• Heat transfer between

objects that touching

• Occurs in Solids

• Ex. Hot stove and your hand

Convection• Heat transfer through the

movement of particles

• Happens through gases and liquids

• Cannot happen in solids, as there is no flow of particles inside of a solid

Radiation• Heat transfer by

electromagnetic waves (does not use gas, or liquid as a medium)

• Light is classified as an electromagnetic wave

• Travels through empty space!

Heat transfer summary

Exit card 3

•Give an example of conduction, convection, or radiation, you cannot use examples from the lesson. Explain why your example is that form of heat transfer

Energy•Different classifications of energy

•Solar

•Mechanical

•Geothermal

•Nuclear

Solar energy• Comes from ________ from

the sun

• Renewable

Geothermal energy• Natural heat energy

produced from the heat of the Earth

Nuclear Energy• Energy obtained from

breaking or creating molecules

Biomass Energy• The energy stored in living

things or recently living

• This can include food and wood

Fossil fuel energy• Similar to biomass energy

but the from the remains of long dead organisms

Conductors and insulators•A conductor is a material that allows heat

move through it easily

•An insulator is a material that does not allow heat to move through it easily

Exit card 4•For your thermos, should you use

conductors or insulators as materials? Why?