1. Do Now: Given that there are 1,000,000 microseconds in a second. How many pennies would you have if you earned one for every microsecond you were in class today (43 minutes)? What is a shortcut that scientists might use to show REALLY big numbers?

2. Homework: All of the worksheet (NOT the addition/subtraction scientific notation) problems must be completed by tomorrow! (Thursday!)

3. Objective The student will be able to: express numbers in scientific and decimal notation. Designed by Skip Tyler, Varina High School

4. How wide is our universe? 210,000,000,000,000,000,000,000 miles (22 zeros) This number is written in decimal notation. When numbers get this large, it is easier to write them in scientific notation.

5. Scientific Notation A number is expressed in scientific notation when it is in the form a x 10 n where a is between 1 and 10 and n is an integer

6. Write the width of the universe in scientific notation. 210,000,000,000,000,000,000,000 miles Where is the decimal point now? After the last zero. Where would you put the decimal to make this number be between 1 and 10? Between the 2 and the 1

7. 2. 10,000,000,000,000,000,000,000. How many decimal places did you move the decimal? 23 When the original number is more than 1, the exponent is positive. The answer in scientific notation is 2.1 x 10 23

8. So let’s try: Estimate how small an atom is and let’s see how close you come to its true size: http://learn.genetics.utah.edu/content/cells/sca le/ So if we write its size in scientific notation in relation to the meter it would be:

9. Did You Know… What does the sun weigh? 4,400,000,000,000,000,000,000,000,000,000 lbs. How much hydrogen does the sun burn each second? 600,000,000 metric tons

10. 1) Express 0.0000000902 in scientific notation. Where would the decimal go to make the number be between 1 and 10? 9.02 The decimal was moved how many places? 8 When the original number is less than 1, the exponent is negative. 9.02 x 10 -8

11. Write 28750.9 in scientific notation. 1.2.87509 x 10 -5 2.2.87509 x 10 -4 3.2.87509 x 10 4 4.2.87509 x 10 5

12. 2) Express 1.8 x 10 -4 in decimal notation. 0.00018 3) Express 4.58 x 10 6 in decimal notation. 4,580,000

13. Write in PROPER scientific notation. (Notice the number is not between 1 and 10) 8) 234.6 x 10 9 2.346 x 10 11 9) 0.0642 x 10 4 6.42 x 10 2

14. Write 531.42 x 10 5 in scientific notation. 1..53142 x 10 2 2.5.3142 x 10 3 3.53.142 x 10 4 4.531.42 x 10 5 5.53.142 x 10 6 6.5.3142 x 10 7 7..53142 x 10 8

15. Chem-o-loon 2 Teams (Boys v Girls) 10 Balloons per side 30 seconds to solve problems First team to pop all balloons wins If everyone gets the answer correctly on the winner’s team: two options (steal a balloon or earn one point)

16. CHEM Order: Metric Conversions Sig Figs (E) Sig Figs (H) Scientific Notation Dimensional Analysis

17. CHEM: Metric Conversion 3000g:_________cg 2500mm:________km 3.4kL:________mL 5274.2sec:________hours

18. Sig Figs (E) DO ALL: 1.3100:_______ 2.24.000:_________ 3..2500:_________ 4.2010:_______ 5.0.98400:_______

19. Sig Figs (H) 2.4 + 31.72 + 7 = 735 x 10 = 24.7 – 17.35 – 2.325 = 1484 x 2.5 / 53.0 =

20. Scientific Notation (E) 3 002 000 24.7 2.97 x 10 4 0.000130 000 7.25 x 10 -11 99.2 x 10 2

21. Dimensional Analysis: 23.5 pizzas:__________slices 13.25 eggs:___________dozens 25 km:_________miles 16.25yrs:_________days 26.229 km/hr:________m/s

22. And the Winner Is…..

23. Complete Exit Ticket: 2.77 x 10 11 31 020 000 1.992 x 10 -8 0.000000002

24. Do Now: Answer each question below: –How many sig figs? 2300_____ 1.420 x 10^3________ 0.003_____304,000________ –Use scientific/decimal notation: 3.0 x 10^4______7894.2________ 40000000_______ 0.000004720_______ –Convert between units: 500 mL = ____L2423mg = ________kg 0.00003 km = ________mm

25. Homework: Complete Review sheet, if desired Be ready for small quiz tomorrow! Bring Pennies (between 5 and 10 per person would be good!)

26. Today: Foldable Creation –Rule Cheat Sheet for Chem Math –Watch the demo, but you fill in any information you need—this should be rules and examples to help you jog your memory!

27. IP Work Time Practice with the Review Sheet If you need help, raise your hand and I will come to assist you.

28. Closing: What will you focus on in preparation for your quiz tomorrow?