1. Quote: The function of education is to teach one to think intensively and to think critically. Intelligence plus character - that is the goal of true education. Martin Luther King, Jr. Wednesday 1/23/13 Objective: Understand link between percent abundance and atomic mass.

2. Bell An element has three isotopes. What is the average mass for the element? Isotope Mass (amu) Isotope Abundance (%) 38.9637074 93.2581 39.9639992 0.0117 40.9618254 6.7302

3. Which is more abundant and why? Boron-10 or Boron-11

4. Finals Monday 1/28 1 st, 4 th and 7 th periods Tuesday 1/29 2 nd,5 th and 8 th periods Wednesday 1/30 3 rd and 6 th periods Periods with finals are 60 minutes long Other classes are 42 minutes Get out at 3:28 pm Make-up exams Thursday during regular 50 minutes

5. Review: Density What is the formula for density? How do you find slope? What are definitions for mass and volume? What are the units for mass, volume and density?

6. 1.) Which substance, black or purple line has a larger density? 2.) 300 g of which substance occupies a greater volume? 3.) What is the density of the black line substance? 4.) 75 g of the black has what volume? 5.) What is the mass of 45cm 3 of black line substance?

7. A cube of metal with a volume of 42.9 cm 3 has a mass of 117g. How dense is the metal?

8. Review: Measurement How many mL in the cylinder and how many cm does the arrow show?

9. Review: Observation Make a qualitative observation about the picture Make a quantitative observation about the picture

10. Review: Chemical vs Physical Mark the following as chemical or physical Car rusting Paint drying Water freezes Eating a hot dog Baking cookies Cutting a brownie into pieces Acid etching glass Dew forms on leaves

11. Law of Conservation of Matter What is the law? Draw a picture showing how dissolving salt follows the law. Salt Water