1. Catalyst – August (30+1), 2009 1. Of your 10 items that you are thinking about putting in your dream lab, pick one that measures something and describe what it measures. 2. Start Part 1 and Part 2 of the worksheet (6 questions) You should have picked it up from the front lab bench on your way in!

2. Today’s Agenda  Catalyst  Short Diagnostic and Reflection  Metric Units and Prefixes  Project Work Time  Exit Question

3. Today’s Objectives  SWBAT identify SI units and SI prefixes.

4. Front DoorProjector 2nd Period Group 3 Katty, Whitnie, Nicolette, Chevalius Group 2 Darren, Isaac, Isaiah, Robin Group 1 Neron, Tre, Denny, Chelsea J. Group 6 Jared, Brittanee, T’Keyah, Rishad Group 4 Keith, Jessica, Arethia, Sidne Group 9 Group 8 Timothy, Corian, Byron, Antonio Group 7 Kerrie, Jenny, Joseph, Juan Group 5 Dorian, Elesha, Chelsea C., Chris

5. Front DoorProjector 4th Period Group 3 Tashica, Seandell, Kennesha, Lee Group 2 Chelsea, Duan, Shant’a, Victoria Group 1 Brittanny V., Brandon, Katelynn, Queirra Group 6 Darionne, Jordan J., Dajaelle, Kathy Group 5 Frank, Amanda, Kevin, Brittany P. Group 4 Phillip, Jordan T., Keyera, Fatina Group 9 Kawanna, Davida, Cole Group 8 Brett, De’Jonnaie Stephanie, Tia, Group 7 Antrashion, Jayde, James

6. Measurement Notes Key Point #1: Science uses the International System of Units, also known as (SI) Why do you think scientists do this?

7. UNITS  Volume uses Liters (L) or Milliliters (mL)  Mass uses Grams (g)  Length uses Meters (m)  Temperature uses Degrees Celsius (  C)

8. Measurement Notes Key Point #2: You can use prefixes to adjust the value of each of these units.

9.  Well fine… what are these prefixes?

10. yotta- (Y-)10 24 1 septillion zetta- (Z-)10 21 1 sextillion exa- (E-)10 18 1 quintillion peta- (P-)10 15 1 quadrillion tera- (T-)10 12 1 trillion giga- (G-)10 9 1 billion mega- (M-)10 6 1 million kilo- (k-)10 3 1 thousand hecto- (h-)10 2 1 hundred deka- (da-)**101 ten deci- (d-)10 -1 1 tenth centi- (c-)10 -2 1 hundredth milli- (m-)10 -3 1 thousandth micro- (µ-)10 -6 1 millionth nano- (n-)10 -9 1 billionth pico- (p-)10 -12 1 trillionth femto- (f-)10 -15 1 quadrillionth atto- (a-)10 -18 1 quintillionth zepto- (z-)10 -21 1 sextillionth yocto- (y-)10 -24 1 septillionth

11. Well… ok, we generally only use a couple of them… PrefixMultiplierPower of ten giga, G1,000,000,000 (billion)10 9 mega, M1,000,000 (million)10 6 kilo, k1,000 (thousand)10 3 hecto, h10010 2 deka, da1010 1 BASE110 0 deci, d1/10 (tenth)10 -1 centi, c1/100 (hundredth)10 -2 milli, m1/1,000 (thousandth)10 -3 micro, µ1/1,000,000 (millionth)10 -6 nano, n1/1,000,000,000 (billionth)10 -9

12. Why?  Let’s use a milli- for an example, 10 -3  You can have a…  Milligram – one-thousandth of a gram  Millimeter – one-thousandth of a meter  Milliliter – one-thousandth of a liter  Millidegree Celsius – one-thousandth of a degree Celsius  If Lil’ Wayne was that rich, he’d be singing a mega, a mega, a mega…

13.  Now that we got measurement down, let’s talk about accuracy

14. Accuracy  Key Point #3: Accuracy is how close you are to the correct or accepted value of a measurement.  Example: Throwing a dart close to the bulls eye  Example: If something is known to have a mass of 500 g and you measure 499 g

15. Precision  Key Point #4: Precision is how close a series of measurements are to one another.  REPEATABILITY!  Ex: Throwing a dart and hitting the same spot 3 times in a row

17. Good Accuracy Good Precision Good Accuracy Poor Precision Poor Accuracy Good Precision Poor Accuracy Poor Precision

18. Precision/Accuracy Activity (15 min)  You will need a package of markers, a bullseye, and a ruler.  Follow directions and have fun.

19. Work Time  Choices:  Finish picking out your lab equipment  Begin your sketches for your lab – rough draft is key!  Homework this weekend:  Finish Lab and Safety Equipment section  Complete rough draft of plans

20. Exist Question Write down if it is good or bad accuracy (A) and precision (P). Explain how SI prefixes work.