Warm up (9/13 and 14) x 1023 FIND YOUR NEW SEATS!

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Presentation transcript:

Warm up (9/13 and 14) 89010 20.0 3.210 x 1023 FIND YOUR NEW SEATS! Yellow HW sheet (Sig Figs WS ) on desk please! IN YOUR NOTES: How many sig figs are in the following numbers? 0.009090 89010 20.0 3.210 x 1023 Write each of the above in scientific notation! 4, 4, 3, 4

Go over Homework

SIG FIGS: What are the Rules? Nonzero integers always count as significant figures. 3456 has 4 sig figs Leading zeros do not count as significant figures. 0.00048 has 2 sig figs

SIG FIGS: What are the Rules? “Trapped” zeros always count as significant figures. 16,007 has 5 sig figs Trailing zeros are significant only if the number contains a decimal point. 9.300 has 4 sig figs 150 has 2 sig figs 150.0 has 4 sig figs 2 x 104 has 1 sig fig

Practice Tell me how many sig figs are in the following numbers and write in scientific notation: 0.498000 4.9008 3300 0.000690 500 120. 6, 5, 2, 3, 1, 3

Scientific notation with Sig Figs Use scientific notation to report the correct number of sig figs! It’s genius! EXAMPLE: To report 319,000 in scientific notation, is it: 3.19000 x 105 or 3.19 x 105 ? 3.19 - the three zeros are not significant, so they are not going to be reported in scientific notation

9.749 9.7 Rounding If removing digits, round up if digit is 5 or higher (1.37 = 1.4) digit stays the same if less than 5 (1.33 = 1.3) Only round based on the first number to the right Round this number to 2 sig figs: Try a few more! Round to 3 sig figs: 67.86 156,070 0.001099 9.749 9.7 67.9; 156,000; 0.00110 OR 1.10 x 10 -3

Arithmetic with sig figs Addition and subtraction Report the smallest number of decimal places 12.10 +1.212 13.312 Multiplication and Division Report the smallest number of total sig figs 2.35 X 11 25.85 Equals 13.31 (2 decimal places) equals 26 (2 sig figs)

Group Practice on Boards On your whiteboards, show… Calculator shows: Correct answer:

Group Practice on Boards 140.7 – 99.102 = 24.6 / 1002 = 56.7 + 433.305 = 3450 x 1.103 = 41.6, 0.0246, 490.0, 3810

7.98 x 413.0 / 67.19 = 4.93 + 140.1 x 53.709 = Challenge Problem! 49.1 7530. (follow both rules, but don’t forget PEMDAS!)

Finish Room Map? 1B and 2B

Safety Training Time Please get out your syllabus with the Safety Contract, a pen or highlighter, and goggles!

Element Memory Quiz (10 min) NO CHEATING OF ANY KIND! Pack up so there is nothing on your desk – no pencil cases, etc. Just a pencil. When you are done, flip it over so I can see you are finished! I’ll trade you for a HW that you can start working on!

Homework Day 4 Read in your book: 68-71 (sig figs) WS Day 4 (more sig fig practice) – do it on your own! Make sure you are ready for: LAB next class (shoes, lab books, etc) Safety quiz T/W next week (must pass to participate in labs!)