1.  Find your name on the sheet at the front of the class. Sit by the number corresponding to your name.  Start filling out the information sheet that you can find at the front of the room.

2. Mrs. Whitaker Unit One, Day One 26 August 2013

3.  Eye-Wash Stations  Safety Shower  Student Center ◦ If you’re absent  Objective and Agenda  What to do when you’re done…

4. - In order to have the most precise answer possible, record as much as you definitely know and then estimate one more digit. - What does this mean??

5.  What are some units of length??

9.  This is a graduated cylinder  Always measure from the bottom of the meniscus.  Remember to add an estimated digit.

12.  This is a triple beam balance.  Mass is measured in grams.  Remember to add an estimated digit!!

14.  All of the digits that can be measured, plus one that is estimated.  Consider the measurement 3.01 g --the instrument used to measure was marked to the tenth of a gram (0.1 g) and the digit in the hundredths place was estimated

15.  75.1 m  30,075 mL  17.0052 g  Marked to the ones place  Marked to the tens place  Marked to the thousandths place

16.  75.1 m  30,075 mL  17.0052 g  3 (2 measured + 1 estimated)  5 ( 4 measured + 1 estimated)  6 (5 measured + 1 estimated)

17. 200 One – zeros have funky rules

18. There are three rules on determining how many significant figures are in a number:  Non-zero digits are always significant.  Any zeros between two significant digits are significant.  A final zero or trailing zeros AFTER THE DECIMAL POINT ONLY are significant.

19.  1750 m  175.0 m  1705 m  1700 m 33 44 44 22

20.  60.50 cm  0.00015 kg  135.000 m  400 000 001 mL 44 22 66 99

21.  Now, work on the first part of the worksheet, on your own.  We haven’t discussed operations yet, so be sure not to work ahead…

22.  The answer must be reported with the lowest number of significant figures that are in the problem.

23.  25g / 5cm 3  5 g/cm 3  0.002cm x 15.2 cm  0.03 cm 2  350g / 2.0 cm 3  180 g/cm 3

24.  The number of decimal places matters!!  Your answer has to be rounded to the lowest number of decimal places.

25.  35 + 454 + 0.3 =  355 – 23.4 =  17.0 – 2.1 =