Definitions must explain observations simply and clearly Scientific theory explanation that has been tested by repeated observations must explain observations simply and clearly experiments that illustrate the theory must be repeatable Must be able to predict from the theory

Scientific Law states a repeated observation about nature Scientific model Representation of an object or event that can be studied to understand the real object or event Examples of models: can be mental picture or set of rules Drawings on paper Computer models 3 dimensional models

Examples of Models

Steps of the scientific method Make an OBSERVATION Formulate a question Do research Form a Hypothesis Test the Hypothesis Analyze results Draw conclusions Share with others

DEMONSTRATION QUESTIONS WHAT ARE THE TWO LIQUIDS IN THE BEAKERS? WHAT WOULD BE A HYPOTHESIS FOR THIS EXPERIMENT? HOW CAN WE TEST OUR HYPOTHESIS? WHAT CONCLUSION CAN BE DRAWN FROM THIS DEMONSTATION?

Units of Measurement SI units base units Length Meter M Mass Kilogram Kg Time Second S Temperature Kelvin K Electric current Ampere A Amount of Substance Mole Mol Luminous intensity Candela cd

SI PREFIXES Giga G Billion 1000 000 000 Mega M Million 1000 000 Kilo K Thousand 1000 hecto h hundred 100 deca da tens 10 Base unit 1 Deci d Tenth 0.1 Centi c Hundredth 0.01 Milli m Thousandth 0.001 Micro , Millionth 0.000 001 Nano N Billionth 0.000 000 001 pico p trillionth 0.000 000 000 001

KING………………….KILO HENRY………………..HECTO DIED…………………DEKA MONDAY……………base unit DRINKING…………….DECI CHOCOLATE…………CENTI mILK……………….MILLI

PRACTICE CONVERSIONS 113 g to milligrams 700 micrometers to nanometers 49,890 m to centimeters Do homework problems page 17 1-8

A. Biology B. physical science C. Earth science D. botany E. zoology F. ecology G. physics H. chemistry I. geology J. meteorology