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!

Today’s Agenda

Catalyst Short Diagnostic and Reflection Metric Units and Prefixes Project Work Time Exit Question

Today’s Objectives

SWBAT identify SI units and SI prefixes.

Front Door

Projector2nd 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 9Group 8Timothy,

Corian, Byron, Antonio

Group 7

Kerrie, Jenny, Joseph, Juan

Group 5

Dorian, Elesha, Chelsea C.,

Chris

Front Door

Projector4th 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

Measurement Notes

Key Point #1: Science uses the International System of Units, also known as (SI)

Why do you think scientists do this?

UNITS

Volume uses Liters (L) or Milliliters (mL)

Mass uses Grams (g) Length uses Meters (m) Temperature uses Degrees

Celsius (C)

Measurement Notes

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

Well fine… what are these prefixes?

yotta- (Y-) 1024 1 septillion

zetta- (Z-) 1021 1 sextillion

exa- (E-) 1018 1 quintillion

peta- (P-) 1015 1 quadrillion

tera- (T-) 1012 1 trillion

giga- (G-) 109 1 billion

mega- (M-) 106 1 million

kilo- (k-) 103 1 thousand

hecto- (h-) 102 1 hundred

deka- (da-)** 10 1 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

Well… ok, we generally only use a couple of them…Prefix Multiplier Power of ten

giga, G 1,000,000,000 (billion) 109

mega, M 1,000,000 (million) 106

kilo, k 1,000 (thousand) 103

hecto, h 100 102

deka, da 10 101

BASE 1 100

deci, d 1/10 (tenth) 10-1

centi, c 1/100 (hundredth) 10-2

milli, m 1/1,000 (thousandth) 10-3

micro, µ 1/1,000,000 (millionth) 10-6

nano, n 1/1,000,000,000 (billionth) 10-9

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…

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

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

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

Good Accuracy

Good Precision

Good Accuracy

Poor Precision

Poor Accuracy

Good Precision

Poor Accuracy

Poor Precision

Precision/Accuracy Activity (15 min) You will need a package of markers, a

bullseye, and a ruler.

Follow directions and have fun.

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

Exist Question

Write down if it is good or bad accuracy (A) and precision (P).

Explain how SI prefixes work.