FridaySeptember 3,

2010(Test 1)

Substitute

No Bell Ringer Today

Bell RingerFriday, 9/3/10

AnnouncementsYou should now have your Science Binder with its Table of Contents and all of the paperwork that you have received put into it.

As soon as you have your ID, please fill out the yellow paper and get your laptop.

Assignment Currently Open Page Date of Notes

on Website Date Issued Date Due

Information Sheet N/A N/A 8/23 8/24

Class Procedures and Expectations 1-4 N/A 8/23 8/25

Lab Safety Contract N/A N/A 8/24 8/26

WS: The Scientific Method

13-14 8/27 8/31

WS: Scientific Practice

17-18 8/30 9/1

Test 1Policies and Procedures,

Safety, Basic Lab Procedures, Scientific Method,

Measurement

Which of the following conclusions is supported by these data?A. Alertness is directly related to level of distraction.B. Shuffling methods can affect alertness.C. Alertness levels vary during the day.D. Long periods of rest improve alertness.

Bell Ringer??????, ???????

Class DiscussionDimensional

Analysis

Metric Conversions

Please take out a blank sheet of paper and title it

Bell Ringers – Week of 8/31/09Look at the front board to see how you

should continue with this sheet.Write and solve the following problems

under today’s date:1.00 foot = ? mm6 quarts = ? kL4300 g = ?kg

Bell Ringer 9-1-09

Class DiscussionScientific Notation

Significant Figures

Please take out your Bell Ringer sheet.Bell Ringers – Week of 8/31/09

Look at the front board to see how you should continue with this sheet.

Write and solve the following problems under today’s date:

Scientific Notation and Sig Figs?0.00094650001 234 765 000

Bell Ringer 9-2-09

Class DiscussionGraphs

Put under today’s date:Analyze the graph

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Put under today’s date:How much liquid is in each graduated

cylinder?

Bell Ringer 9-4-09

Precision vs. Accuracy Precision and accuracy are not the same thing. Accuracy indicates how close you come to the actual or known

value. Precision refers to:

the number of decimal places that you can report a number to with certainty.

Or, the ability to obtain the same result over and over again. Example: The TV weather forecaster says that it will be

between 40 and 60 degrees today. The actual reading turns out to be 53. Thus, the forecast was accurate, but not very precise. The forecaster provided a true statement but without enough detail for us to make plans. For tomorrow, the forecast is 52.47 degrees at 4 PM. It turns out to be 61 degrees. This forecast was very precise, but completely inaccurate.

So what good is one without the other? Not much! The above examples show that precision is useless without

accuracy, but that accuracy with little precision does not tell much either.

Precision vs. Accuracy

Precision

Percent Error

Put under today’s date:

No Bell Ringer Today.

Bell Ringer 9-8-09

Put under today’s date:

Make the following calculation:

234.76 mm + 54.65 cm =

Bell Ringer 9-9-09

No Bell Ringer TodayPick up a calculator and a

Scantron (blue side) on your way in.

Take out all of the Reference Sheets that you want to use

on today’s test.You need a pencil.

Bell Ringer 9-10-09