1. Catalyst What piece of lab equipment would you use to measure…  The volume of water?  The volume of a square block?  The mass of a diamond?  The temperature of a solution being heated?  The length of the classroom?  The density of a weird shaped rock? (CHALLENGE!)

2. Today’s Agenda  Catalyst  Short Diagnostic  Standard International Units  Prefixes – it just makes too much sense  Accuracy and Precision  How accurate/precise are you?  Exit Question

3. Today’s Objectives  SWBAT identify and use SI units and SI prefixes.  SWBAT distinguish between accuracy and precision.

4. Short Diagnostic  You have 4 minutes to show me what you know!  We will go over the answers while taking notes!

5. Measurement Notes Key Point #1: Scientists have a standard international way of measuring volume, mass, and length known as SI Why do you think scientists do this?

7. Standard International Units  Volume is the amount of space an object takes up; measured in liters (L) or centimeters cubed (cm 3 )  Mass is the amount of matter in an object; measured in grams (g)  Length is the distance from one point to another; measured in meters (m)

8. What unit should you use to answer the following questions??? 1. How far is it from the Earth to the Sun? 2. How much water can I fit into the beaker? 3. How much matter can we put on the table before it breaks? METERS LITERS GRAMS

9. Prefixes Key Point #2: You can use prefixes to adjust the value of each of these units. Why would scientists do this?

11.  Well… fine… what are these prefixes?

12. 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

13. Well… ok, we generally only use a few of the prefixes…PrefixMultiplier Power of ten giga, G1,000,000,000 (billion) grams in a Gg10 9 mega, M1,000,000 (million)10 6 kilo, k1,000 (thousand)10 3 hecto, h100 (hundred)10 2 deka, da10 (ten)10 1 BASE110 0 deci, d1/10 (tenth)10 -1 centi, c1/100 (hundredth) of a gram in a cg10 -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

14. Figure it out! Fill in the blanks! 1. 1,000 milligrams = 1 gram 2. 10 meters = 1 dekameter 3. 1,000,000,000 liters = 1 gigaliter 4. _____________ centimeters = 1 meter 5. 1,000,000 micrograms = _________ gram 6. 200 meters = ____________ hectometers

15. Figure it out! Fill in the blanks! 1. 1,000 milligrams = 1 gram 2. 10 meters = 1 dekameter 3. 1,000,000,000 liters = 1 gigaliter 4. _____________ centimeters = 1 meter 5. 1,000,000 micrograms = _________ gram 6. 200 meters = ____________ hectometers 100 1 2

16. Having trouble? 10 # If the number is negative, If the number is positive, move the decimal to the left move the decimal to the right

17. Prefixes can be used for all units  Let’s use a milli- for an example  You can have a…  Milli gram – one-thousandth of a gram  Milli meter – one-thousandth of a meter  Milli liter – one-thousandth of a liter  If Lil’ Wayne was really that rich, he’d be singing a mega, a mega, a mega…

18. Knowing what you know now…  Correct your pre-test! 1. A 2. D 3. D 4. B 5. D 6. A

19. Who’s a balla?!?!?!? Who’s a shot calla?!?!? I hope you all are! If you’re not, come to tutoring!!!!

20. Precision/Accuracy Activity (15 min)  You will need a package of markers, a bulls eye, and a ruler.  Follow the written procedure.  Don’t worry about answering questions at the end….yet!

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

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

23. Precision  Key Point #4: Precision is how close a series of measurements are to one another.  REPEATABILITY!  Example of GOOD PRECISION: Throwing a dart and hitting the same spot 3 times in a row  Example of GOOD PRECISION: If something is known to have a mass of 500 g and four students measure it to be 497 g

25. Good Accuracy Good Precision Good Accuracy Poor Precision Poor Accuracy Good Precision Poor Accuracy Poor Precision

26. Group Activity  Please answer questions at the end on the back of your group paper  Please leave group assignment in folder!

27. Exit Question Describe the accuracy (A) and precision (P) of 1 & 2. What prefix/unit would you use to measure the volume of cold drink in a can? What prefix/unit would you use to measure the length of your pinky?