1.  Math Skills: Sci Not Review, Sig Figs, SI Units, Dimensional Analysis GT Chemistry 9/3-4/15

2. Drill  Scientific Notation Review:  When writing a value in scientific notation, the mantissa (first number) must be between what two values?  (5.0 x 10 5 )/(2.0 x 10 -14 ) = ?  (3.0 x 10 12 ) 3 = ?  1/(4.0 x 10 6 ) = ?  HW: Unit Conversions and Factor-Label Method WS

3. Objectives  IWBAT  Review Scientific Notation  Explain and use significant figures for taking measurement, interpreting measurements, and calculating with measurements  Use the SI Units system to correctly describe measurements  4A – get textbooks  Collect safety contracts  NOTE: Unit 1 Test will be 9/8-9, second half of class, after a review session

4. Agenda  Drill  HW Review  SI Unit review  Dimensional Analysis & Practice  Closure/Exit Ticket

5. HW Review  Let’s put the problems from Calculations Using Sig Figs up on the board  Let’s discuss the Metric Scavenger Hunt

6. SI Unit Review  Write the correct symbol:  dekamole  kiloKelvin  centisecond  Write the correct name:  um  dag  ML

7. What is Dimensional Analysis?  A method to convert from unit to another.  For example, you measure your height in inches, but you want it in centimeters. How do you change it?  1 in = 2.54 cm

8. Another example  Exchange rate:  $1 = 120.17 yen  1 euro = $1.12  I have 575 euro. How many yen is that equal to?

9. Another Dimensional Analysis Problem  In October 1958, Oliver Smoot (an MIT student) was used to measure the length of the Harvard Bridge. It was found to be 364.4 smoots long.  1 smoot = 67.0 in (5’7”), 1 yard = 0.9144 m  How long is the bridge in meters? If it takes 8.0 minutes to walk across the bridge, what is your speed in meters per second?

10. Dimensional Analysis Practice  Dimensional Analysis Practice Problems WS  Unit Conversions WS  English to Metric Conversion Practice WS

11. Closure/Exit Ticket  A person weighs 152 lb. How many grams is that?  1 kg = 2.2 lb  How many grams in a kilogram?