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.
Mrs. Whitaker Unit One, Day One 26 August 2013
Eye-Wash Stations Safety Shower Student Center ◦ If you’re absent Objective and Agenda What to do when you’re done…
- 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??
What are some units of length??
This is a graduated cylinder Always measure from the bottom of the meniscus. Remember to add an estimated digit.
This is a triple beam balance. Mass is measured in grams. Remember to add an estimated digit!!
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
75.1 m 30,075 mL g Marked to the ones place Marked to the tens place Marked to the thousandths place
75.1 m 30,075 mL g 3 (2 measured + 1 estimated) 5 ( 4 measured + 1 estimated) 6 (5 measured + 1 estimated)
200 One – zeros have funky rules
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.
1750 m m 1705 m 1700 m 33 44 44 22
cm kg m mL 44 22 66 99
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…
The answer must be reported with the lowest number of significant figures that are in the problem.
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
The number of decimal places matters!! Your answer has to be rounded to the lowest number of decimal places.
= 355 – 23.4 = 17.0 – 2.1 =