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Scientific NotationAccuracy & Precision

LabGT Chem 8/28/14

Drill

Multiply (3.5 x 103)(4.0 x 105) (8.2 x 1013)(1.0 x 10-

5)

Divide (8.2 x 1013)/(1.0 x 10-

5) (1.5 x 103)/(3.0 x 106)

And we get… 1.4 x 109

8.2 x 108

8.2 x 1018

5.0 x 10-4

Objectives

IWBAT Practice with scientific notation Define precision and accuracy Perform measurements with precision and

accuracy.

HW Review

1. 5.3 x 108

2. 4.0 x 1014

3. 2.0 x 104

4. 2.0 x 101

5. 1.5 x 103

6. 4 x 108

7. 6.2 x 10-6

8. 3.4 x 10-5

9. 4.9 x 101

10.5 x 103

Scientific Method Qs?

Any?

Precision vs Accuracy

I will draw a target and discuss the diagram.

Precision & Accuracy

What is precision? Precision is how close a series of

measurements are to each other.

What is accuracy? Accuracy is how close a measurement is

to a “standard”. For example, the center of a bullseye.

Sports Examples

http://blog.affinitymed.com/wp-content/uploads/2009/06/6-7-09-kobe-shooting-in-the-paint-small.jpg

http://i.cdn.turner.com/si/multimedia/photo_gallery/0808/oly.phelps.sequence/images/opgm-37117-mid.jpg

Accuracy and Precision Lab

You will work in the same pairs as Monday.

Now, go into the lab and follow the directions to gather data for Trial 1 of the Accuracy and Precision Lab.

All done? Come back to seats and do the calculations for Trial 1.

Record your percent error on the board.

If time, return to lab to try again.

Closure

How accurately can one measure using a ruler? Using a graduated cylinder?

Is there a formal way to represent this concept?