# Pre Class: Thu. 9.23.10 ID in the cart and get your laptop. Username: Student Password: Student. www.empower3000.com Work on “A Hands on Study”. And “Don’t.

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Pre Class: Thu. 9.23.10 ID in the cart and get your laptop. Username: Student Password: Student. www.empower3000.com Work on “A Hands on Study”. And “Don’t Want the Flu…” –Read then do the Activity, Thought and Poll Questions for each article. I am collecting HW!!!

In your notebook: From what you read in “Don’t Want the Flu?” –The scientists studied the survival rate of the flu virus in dry and humid air. What was the control group? The experimental group? The independent variable? Dependent variable?

When/If you are done with both articles… https://biologyisfun.wikispaces.com On the left side click on “Powerpoints Phy Sci”. Open the presentation called “Phy Sci Scientific Notation”. And take notes and complete the practice problems.

Pre Class: Friday 9.24.10 Take a Quiz. –Answer #1-10 (#10 is on the back). –You may write on the quiz. –Ch. 1 Test Friday 10.1.10

Scientific Notation- used to express numbers that are very large or very small. Reduce the number of zeroes and express a simple number multiplied by a power of 10. 0806.2.1 Recognize and use scientific notation.

When using Scientific Notation, there are two kinds of exponents: positive and negative Positive Exponent: 2.35 x 10 8 Negative Exponent: 3.97 x 10-7

Standard Notation to Scientific Notation! 1) First, move the decimal after the first whole number: 3 2 5 8 123 3 2) Second, add your multiplication sign and your base (10). 3. 2 5 8 x 10 3) Count how many spaces the decimal moved and this is the exponent. 3. 2 5 8 x 10

1)Move the decimal point to the right or left until you have a number that is greater than or equal to 1, but less than 10. 2)Count how many places you moved the decimal point. This number will become the absolute value of the exponent. 3)If you moved the decimal point to the left, the exponent will be positive. 4)If you moved the decimal point to the right, make the exponent negative. Using Scientific Notation…

Scientific Notation to Standard Notation -Exponent tells how many spaces to move the decimal point. With a positive exponent, move the decimal to the right: 4.08 x 10 3 = 4 0 8 Don’t forget to fill in your zeroes!

Scientific Notation to Standard Notation. -Exponent tells you how many places to move the decimal. With a negative exponent, move the decimal to the left: 4.08 x 10 -3 = 4 0 8 Don’t forget to fill in your zeroes!

Try changing these numbers from Scientific Notation to Standard Notation: 1)9.678 x 10 4 2)7.4521 x 10- 3 96780.0074521

Try changing these numbers from Standard Notation to Scientific Notation: 1)9872432 2).0000345 9.872432 x 10 6 3.45 x 10 -5

Multiplying and Dividing with Scientific Notation. (5.5 X 10^4 cm) X (1.4 X 10^4 cm). Multiplication = add the exponents. 5.2 X 10^8 cm^3 / 9.5 X 10^2 cm Division = subtract the exponents.

Practice on Your Own… Complete the scientific notation problems #1-16 in the Metric Mania Packet. HW: Read p. 20-24. Practice p.23 #1-2. Practice p. 24 #1-2. Section Review p. 26 #1-2 and Math Skills # 5-6.

Friday Fun!-- Mythbusters. Review of the scientific method, controls, variables, lab safety and reliable results. Answer the questions in your notebook.

Pre Class: Monday 9.27.10 Take a Constructed Response Sheet, a piece of loose leaf and a Weekly Schedule. Answer Parts A and B in complete sentences on the loose leaf paper. I am checking HW!

Recap Sci. Notation HW. 1. 800,000,000 mAnswer: 8 X 10^8 m b. 0.0015 kgAnswer: 1.5 X 10^-3 kg c. 60,200 LAnswer: 6.02 X 10^4 L d. 0.00095 mAnswer: 9.4 X 10^-4 m e. 8,002,000 km Answer: 8.002 X 10^6 km f. 0.00000000006 kmAnswer: 6 X 10^-11 kg

Recap HW: Sci. Notation to long form. 2. 4.5 X 10^3 g b. 6.05 X 10^-3 m c. 3.115 X 10^6 km d. 1.99 X 10^-8 cm Answer: 4,500 g Answer: 0.00605 m Answer: 3,115,000 km Answer: 0.0000000199 cm

Significant Figures Monday 9.27.10

Significant Figures- Why do we care? To show the precision of a measured quantity. Precision- exactness of a measurement. (Repeatability) Accuracy- how close a measurement is to the true value of the measured quantity.

Accuracy and Precision

Sig. Figures 1100 grams 1100.0 grams Which is more precise? Only deal with measured values!

Significant Figures- Rules. 1. Non zero digits are ALWAYS Significant. (22.4567- 6 Sig. Figs) 2. Any zeroes between two Sig. Figs. Are significant. (22.507- 5 Sig Figs) 3. A final zero in the decimal portion ONLY are significant (2.30 X 10-5-- 3 Sig. Figs)

Other types of Zeroes. Place holding zeroes are NEVER significant. (.00500 --3 Sig Figs) –When you write this in Sci. Notation the non-significant zeroes disappear. Zero to the left of a decimal point is NEVER significant. –Its only there to let you know that it is a decimal and not a period! (0.00500)

Other types of Zeroes. Trailing zeroes in a whole number are NOT significant. (200 -- 1 sig fig).

Leading zeroes in a whole number are NOT significant. (00250-- 2 sig figs).

On your own… Work on the Front side of the sheet. #1-13. If you are finished, start the back.

Wrap It Up! Exit Ticket: Why are significant figures important? HW: finish the back of the worksheet.

Pre Class: Tuesday 9.28.10 In your notebook: –A 4.00 kg rock’s mass is measured several times. Which set of measurements below is precise but not accurate? Explain why! (you can use your notes!) (2-3 sentences). A. 3.5 kg, 2.5 kg, 4.5 kg B. 3.55 kg, 3.57 kg, 3.56 kg C. 3.99 kg, 4.02 kg, 4.00 kg I am checking your HW:)

Recap HW: #1-45, #76-83, #88- 102. Take 7 min and discuss your answers with a partner. Together, also answer #11, 12, and 13 on the front side of the sheet. Be ready to share your answers with the class.

Addition and Subtraction with Sig. Figs. Rule: the answer cannot be more precise than the values in the calculation. –You have to round the answer to the # of sig. figs. Of the least precise value. Example: 6.3421 s + 12.1 s = 18.4421 s –Round to correct # of sig. figs: 18.4 s

Practice on your own: (Make sure you round to the correct # of sig figs.) A. 1.23 g + 4.567 g = B. (1.23 x 10^6 mm) + (4.567 x 10^6 mm) = C. 54.20 cm - 22 cm = D. (4.220 x 10^-6) - (9.963 x 10^-7) = –This one is tricky! Make sure both #’s have the same exponents before subtracting the two lead numbers! Don’t subtract the exponents!

Wrap It Up! Exit Ticket: #1-7 Mythbusters review of scientific method, etc. HW: Finish Sig. Figs. Practice Packet.

Pre Class: Wed. 9.29.10 Get your portfolio. ID in the cart and get your laptop. Sign on to lap top: Username: Student Password: Student. www.empower3000.com Work on “No Water? No Problem” –Read then do the Activity, Thought and Poll Questions for each article. I am collecting HW!!!

When you are done… Review assignment: –Textbook p.27 Practice #1 (Pie chart) –P.28 Understanding Concepts #1-15. –P.29 Building Math Skills: #22 and 26.

Wrap It Up! Exit Ticket: Return Laptop and get your ID. HW: Finish “No Water? No Problem.” Log on to Empower3000 at home and change your avatar and check out the games section.