2. ORGANIZED APPROACH TO PROBLEM SOLVING USING UNITS Factor Label/ Conversions/ Dimensional Analysis

3. 1. ALWAYS START WITH "? units wanted ” ? Units wanted =

4. 2. Write Given quantity on top ? Units wanted = Given quantity

5. 3. Write matching conversion factor on bottom of next parenthesis ? Units wanted = Given quantity Matching conversion factor

6. 4. Put wanted unit of conversion factor on top! ? Units wanted = Given quantity Matching conversion factor Wanted unit of conversion factor

7. 5. Multiply everything on top, and divide by everything on bottom! ? Units wanted = Given quantity Matching conversion factor Wanted unit of conversion factor *In calculator type: (multiply everything on top) / (multiply everything on bottom) = your answer with units wanted!

8. ? Units wanted = given quantityUnits wanted Matching conversion factor: MUST be in SAME UNIT as your Given Quantity!!!!!!!!!! *You must have the same unit on top in the first parenthesis, as you do in the bottom of the next parenthesis!! *Diagonal Units: must cancel out!

9. You can also do this with multiple conversion factors! ? Units wanted = Given quantity Matching conversion factor Some unit Start with same steps as before, but your first conversion factor may not have the wanted unit on top. You may need to use many conversion factors to get to the unit wanted!! Some unit conversion factor Units wanted!

10. 1year = ______ mins ? mins = 1 year 365 days 1 day 24 hrs 1 hr 60 min

13. 1 Mole GFM in grams 1 Mole 22.4L # Moles X # Moles Y 1 Mole 6.022 x 10 23 1 KiIoX 1000X 1 X 1000 miliX 1 Liter 1000 milliliters mass moles # particles moles moles x moles y 1 Kilogram 1000 grams 1 Gram 1000 milligrams Volume (gas) moles Milligrams gramsMilliunit unit Milliliters Liters Unit Kilounit Grams Kilograms

14. Example conversion Na 2 SIO 3(s) + 8 HF (aq)  H 2 SiF 6(aq) + 2 NaF (aq) + 3 H 2 O (l) How many grams of Na 2 SiO 3 can react with 0.800 g of HF?

15. Na 2 SIO 3(s) + 8 HF (aq)  H 2 SiF 6(aq) + 2 NaF (aq) + 3 H 2 O (l) How many grams of Na 2 SiO 3 can react with 0.800 g of HF?

16. Na 2 SIO 3(s) + 8 HF (aq)  H 2 SiF 6(aq) + 2 NaF (aq) + 3 H 2 O (l) How many grams of Na 2 SiO 3 can react with 0.800 g of HF?