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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 - PowerPoint PPT Presentation
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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?