AtomsNovember 3, 2015(It’s complicated)6th grade – 3.1-3.27th grade – review

8th grade – 3.1

Meme Moment

Scientist of the Day

Frederick McKinley Jones

• Adopted by a priest in 8th grade

• Wanted to be a mechanico Apprentice on a farm

• In WWI, learned electronics Made a transmitter for a radio station, then hired for more jobs

• Made a fridge that could fit on a truck (and not be plugged in!)o Changed the food in storeso Thermo King!

We are all stardust.

Energy MatterGray area

Made in starsIdeasE=mc2

Studying Matter• Chemistry: the study of matter and how it changes

o Ms. B is a chemist!

• Changes and qualities in matter are classified as physical properties or chemical properties

• Physical properties: things that happen to a substance without turning it into another substance

• Chemical properties: things that happen to a substance when its turning into another substance

Substances• Substance (pure substance): a type of matter

that is only made up of one type of thing

• Mixture: combination of 2 or more substances

• Homogeneous mixture: cannot easily be separated – it all looks the same

• Heterogeneous mixture: easy to separate pieces

Atoms• Atom: Smallest unit of matter.

o Except not really, because atoms are made up of ‘subatomic particles’

• Substances made of one type of atom are called elements.

• There are only 118 known elements in the universeo You can see them all on the periodic table (which is a

little out of date)o Each atom has a symbol. E.g. Oxygen is O.

• All of them (except hydrogen and helium) were made in stars

Molecules• Molecule: 2 or more atoms stuck together to

make a substance (chemical). The atoms are joined with chemical bonds

• Chemical bond: force of attraction between 2 atoms

Molecules, cont.• A single type of molecule is still a substance

• In some cases, a molecule can also be an elemento (Carbon) C is an element/atom, but it’s also a molecule

because it can exist on its own in pencil graphite, diamonds, etc

o Elements like oxygen, nitrogen, hydrogen pair up with each other naturally to make diatomic molecules like O2, N2, H2

• When a molecule turns into another molecule, it is a chemical change or chemical reaction

Chemical vs Physical• If you burn propane in oxygen, you make carbon

dioxide and water vapor.o Propane, oxygen, carbon dioxide, and water are all

different molecules, so you know they’ve had a chemical change

• What are some physical properties?• What are some chemical properties?