1. Bellringer Wed, 10/06 1.Please fill in the following missing letters in the pattern below… O T T F _ _ S U D T C _ _ S Reminders: LAB FEE NOW! HW #5 due Fri! FS CS One Two Three Four Five Six Seven Uno Dos Tres Cuatro Cinco Seis Siete

2. Brief Intro to Chemistry

3. What is everything made of? Everything is made of matter Matter is found as elements Elements are organized on the Periodic Table They are made of atoms

5. What is an atom? Smallest unit of matter! Everything is made of atoms.

6. Parts of an atom

7. A happy atom must have… Number of p + = number of e -

8. What makes atoms different? What makes an atom unique is the number of protons in nucleus We know what element the atom is if we know the # of p+ in nucleus How do we know the number of protons? we look on the periodic table!

9. How to read element info! Element Symbol Atomic Number (#p + ) Mass Number (#p + + #n 0 ) Note: #n 0 = Mass Number - Atomic number

10. So what does it look like?

11. Atom + Atom Two or more atoms = molecule Element + element = compound All compounds have a formula (like a recipe! H 2 0, NaCl! Mixture: not chemically combined, can be separated (rice and corn) Solution: chemically combined, cannot separate physically (coffee, juice)