1. Atoms November 3, 2015 (It’s complicated) 6 th grade – 3.1-3.2 7 th grade – review 8 th grade – 3.1

2. Meme Moment

3. Scientist of the Day

4. Frederick McKinley Jones Adopted by a priest in 8 th grade Wanted to be a mechanic o 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 stores o Thermo King!

6. We are all stardust. Energy Matter Gray area Made in stars Ideas E=mc 2

7. 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

8. 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

9. 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 There are only 118 known elements in the universe o You can see them all on the periodic table (which is a little out of date) o Each atom has a symbol.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

11. 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

12. Molecules, cont. A single type of molecule is still a substance In some cases, a molecule can also be an element o (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 O 2, N 2, H 2 When a molecule turns into another molecule, it is a chemical change or chemical reaction

13. 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 ?