Julie Ladd

Science is a way of thinking much more than it is a body of knowledge.

-Carl Sagan





Biology II


Chemistry I

Answers to moles review

  1. Ca3(PO4)2 310. 3 g/mol
  2. 0.5640 mol Ca3(PO4)2          1.692 mol Ca+2            2.72 X 1024 O atoms
  3. 19.88% Phosphorus by mass so ….. 4.04 g P
  4. 97.2 g =  97.2 mL H2O because it is water, which has a special density…remember J
  5. 0.280 g SO2
  6. D=m/vol  17.0 g/mol  so  NH3
  7. K1Cr1O3.5 so     K2Cr2O7
  8. P1O2.5 so empirical P2O5                  molecular:  P4O10
  9. 56.4 g sucrose in 150 ml of water or so, dissolve and then fill to the 300.0 ml mark.

Vocabulary and concepts

Avogadro’s number

Why is the mole quantity so big?

You understand that you can have several moles of atoms or ions in a single mole of a compound!!

Molar mass…how to calculate and the units that accompany it

Volumes of gases at STP

What does STP mean as far as temperature and pressure

Molarity and solution concentration

Empirical formula versus molecular formula

Julie Ladd's Schedule

  • 7:30 - 8:10

    available for help

  • 1st Period

    Chemistry I Room 209

  • 2nd Period

    Chemistry I Room 209

  • 3rd Period

    Chemistry I Room 209

  • 4th Period

    Prep/Lunch Available for help

  • 5th Period

    Chemistry I Room 209

  • 6th Period

    available for help Room 209

  • 7th Period

    Chemistry I Room 209

  • after school 3:20-4:30

    available for help