1. Do Now & Announcements
Take out HW to be checked if you did not get it stamped. Work on Molar Mass/%Comp Warm Up Problems
Unit 2 Quiz WED 9/28 (A), THUR 9/29 (B)

2. 41.67% Mg
54.86% O
3.46% H
47.70 % Cr
52.30 % F
15.77% Al
28.11% S
56.12 % O
38.67% K
13.86% N
47.47% O
58.33 grams
grams
grams
grams

3. Classification Mini-Lab
There are 6 substances
Identify them as an element, compound, or mixture using the periodic table and/or your observations

4. Classification 6 Substances
Piece of Aluminum Metal
Copper Sulfate Crystals
Copper Chloride Solution
Ethanol
Sulfur Powder
Copper Chloride Solution + Mineral Oil

6. Grams <-> Moles Conversions

7. Atom vs. Molecule ATOM MOLECULE
Atom= the smallest, simplest unit of matter.
Can refer to individual elements only
Molecule=the smallest, simplest unit of a pure substance
Can refer to elements or compounds
ATOM H H H H H
MOLECULE
MOLECULE

8. ATOM MOLECULE H H H H H MOLECULE
A water molecule is represented by H2O
A water molecule contains 2 atoms of hydrogen and 1 atom of oxygen
A hydrogen molecule is represented by H2 (it’s diatomic)
An oxygen molecule is made up of 2 hydrogen atoms

9. Remember:
1 mole = 6.02 x 1023 particles!

11. Molecules Conversions
1.51 x 1024 molecules
4.37 x 1023 molecules

12. Molar Conversions Exit Activity
Turn in when done
HW=right half of note sheet.