1. Chem Turn in Classification of Matter Mini-Lab from Friday
Work on Do Now questions
Unit 2A Quest Mon 10/2 (A), Tue 10/3(B)

3. What is a Mole?
Watch the video ( QktVJN0) and answer the questions:

4. Molar Mass: The mass of one mole of a substance
Percent Composition: Identifies the elements present in a compound as a mass % of the total compound mass

5. 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

7. Grams <-> Moles Conversions

8. 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

9. 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

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

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

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