1. Good Afternoon! Today is Wednesday, September 16, 2015 HW Due: Determining Significant Figures #1-14 Determine the number of significant figures in the following numbers: 1. 395 2. 0.000000006 3. 52,000,000

2. Homework Questions?

3. Significant Figures Determine the number of significant figures for each of the numbers below on a separate sheet of paper: 1.3.560 2.0.009432 3.6,000 4.2,000,403 5.0.0530

4. Scientific Notation Easy way to handle very small or very large numbers 0.0000000056 5.6 x 10 -9 5,600,000,000 5.6 x 10 9

5. Scientific Notation 0.000000378 1,200,000,000,000 980,000 0.0000000046 ► Move towards the right, negative exponents ► Move towards the left, positive exponents ► Let’s try a few examples:

6. Scientific Notation Can also help gain or lose significant figures Express each of the numbers with three significant figures 43,005,679 0.0009249 21,000,000 0.00000345392

7. Rounding Numbers Rounding numbers can also help achieve the correct number of significant figures Express the following numbers with 3 significant figures: 4.376 9,128 0.0000003948 350,989

8. Conclusion Express the following numbers with three significant figures: 5.9873246 0.000003284 351.0000000 50,000,000

9. Homework Complete the remainder of “Determining Significant Figures” for tomorrow Be sure to turn in Syllabus Agreements and Lab Safety Contracts