Measurement and Scientific Tools NOS- Lesson 2

Description: you are observing and saying what you observe. Explanation: you are inferring and telling us why or how you know. Vocab Check

Hash tag example Precision-a description of how similar or close measurements are to each other. Accuracy- a description of how close a measurement is to an accepted or true value. Why do we need SI??????

Bull’s Eye Example Bull’s eye Example Why is it important for your watch to have accurate time? How can a clock be precise, but not accurate? Bull’s Eye Example

Measurement The Squirrel traveled 5 meters to get a an acorn. How far is that? The Squirrel traveled 5 feet to get the acorn. Inches, ft, yards, miles mm, cm, meters and Km International system of Units (SI)- internationally accepted system for measurement. Measurement

Base Units Length= meters (m) Mass=grams (g) Time= seconds (s) Volume= Liters (l) Base Units

Meter stick Group practice with a meter stick or rulers. Hands on

KILOGRAMS MILLIGRAMS GRAMS 1 kg = 1,000 g 1 g = 1000 mg 1000 mg = 1 g 1 kg = 1,000,000 mg 1 g = 1000 mg 1,000 g = 1kg 1000 mg = 1 g 1,000,000 mg = 1kg

Prefixes-what is a prefix? Kilo- (k) Hecto- (h) Deka- (da) BASE UNIT Deci- (d) Centi-(c) Milli- (m) Prefixes-what is a prefix?

USE THE STAIRS

USE a MNEMONIC Come up with your own Mnemonic, prepare to share. Kelly Has Dirty Underwear Don’t Check Mine. USE a MNEMONIC

Try these conversions, using the ladder method. 1000 mg = _______ g 1 L = _______ mL 160 cm = _______ mm 1.4 km = _______ m 10.9 cg = _______ kg .250 m = _______ km

Description Explanation SI Precision Accuracy Vocab Check

SI still not good enough? Significant Digits- Number of digits in a measurement that are used with a certain degree of reliabilitiy. All Exact digits + one that is estimated. SI still not good enough?

Rules All nonzero numbers are significant Zeros between nonzero numbers are significant Final Zeros used after the decimal point are significant Zeros used solely for spacing the decimal point are not significant. Rules

Quiz Example Sig Figs Applied Rules 1.234 1.2 0.023 0.200 1,002 3.07 0.001 0.012 50,600 Quiz

Scientific Tools Science Journal Balances Thermometer Microscopes Magnifying glass Slide Dissecting tools Pipette Flask Graduated cylinder Beaker Test Tubes Bunsen burner Scientific Tools