HONORS CHEMISTRY August 3, 2012.

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Presentation transcript:

HONORS CHEMISTRY August 3, 2012

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 + 4.30 mL - 10.204 mL = (0.0300 g + 2.34 g) x 2.302 g =

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

Grade Worksheet Significant Calculations Worksheet Review  How to round numbers to get the correct number of significant figures 123456789

Honors Chemistry Research Project Refer to handout

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

Scientific Notation Scientific Notation Example Shorthand way of expressing numbers that make them easier to work with 6.02 x 1023 2.34 x 105 3.78 x 10-3

Scientific Notation Any Patterns?

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

Scientific Notation Examples 0.0025 1,750,000 2.5 x 10-3 1.75 x 106

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

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

Sig Figs in Scientific Notation The numbers expressed in the scientific notation are significant Examples: 5.02 x 104  5.02 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. 50.200  5 SF  5.0200 x 101

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

6. 5.38 x 10-3 5 million 8.00 x 104 0.00859 953.6

Rally rows Review Sig figs in Calculations (25 g/mol)(4.0 mol) = 12 cm + 0.031cm + 7.969 cm = (41.025 g - 23.38g) ÷ 8.01 mL= 17.3 cm x 6.2 cm + 3.28 cm2 = 109.3758 m2  45.813 m = What is the mass of Salt (NaCl) if the sodium has a mass of 22.99 g and the Cl a mass of 35.5g?

Homework Topic Selection (SR)