1. HONORS CHEMISTRY
August 3, 2012

2. Brain Teaser Place Sig Fig Calculations WS on your desk
Calculate and express your answer using the correct units and significant figures:
47.0 m/2.2 s
140 cm x 34 cm
24.50 mL mL mL =
( g g) x g =

3. Agenda Brain Teaser Collect Lab Report: Blubbenbacher Lab
Announcement:
Grade Significant Figures Calculation Worksheet
Honors Chemistry Research Project
Scientific Notation Notes
Review Significant Figure Calculations
Homework
Topic Selection (SR) Research
Sign Progress Report

4. Grade Worksheet Significant Calculations Worksheet
Review  How to round numbers to get the correct number of significant figures

5. Honors Chemistry Research Project
Refer to handout

6. How do we represent 3000 using 2 significant figures?
Scientific Notation
How do we represent 3000 using 2 significant figures?

7. Scientific Notation Scientific Notation Example
Shorthand way of expressing numbers that make them easier to work with 6.02 x x x 10-3

8. Scientific Notation
Any Patterns?

9. Scientific Notation Rules Base number 1-9
Exponent = the number of times the decimal must be moved to bring the base number to 1-9.
Numbers greater than 1 have a positive exponent, numbers less than 1 a negative exponent

10. Scientific Notation
Examples
0.0025
1,750,000
2.5 x x 106

11. Scientific Notation Problems 0.0000678 998953000000 0.5768
Express in Scientific Notation

12. Scientific Notation Problems 1.567 x 10-3 6.02 x 1023 3.14 x 102
Express in Standard Notation
1.567 x x x 102

13. Sig Figs in Scientific Notation
The numbers expressed in the scientific notation are significant
Examples:
5.02 x  x 104  3 S.F
The number of significant figures in a set of numbers will be the # of sig figs in the scientific notation.
 5 SF  x 101

14. Survivor Science
Convert the following to exponential notation or to ordinary notation
Tell me how many Sig Figs. 76
896745
8.9 x 103
3.45 x 10-1
0.222

15. x 10-3
5 million
8.00 x 104
953.6

16. Rally rows Review Sig figs in Calculations
(25 g/mol)(4.0 mol) =
12 cm cm cm =
( g g) ÷ 8.01 mL=
17.3 cm x 6.2 cm cm2 =
m2  m =
What is the mass of Salt (NaCl) if the sodium has a mass of g and the Cl a mass of 35.5g?

17. Homework
Topic Selection (SR)