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# Measurement

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### Measurement

1. 1. <ul><li>When you come in, please get out your lab materials from yesterday. Do what you need to do to complete the lab (weigh sand) and complete the calculations. I will be collecting it in fifteen to twenty minutes. Finish up! If you are done, study for the quiz today. </li></ul>
2. 2. Section 3.1-3.3
3. 3. <ul><li>A measurement contains two things: </li></ul><ul><li>Number </li></ul><ul><li>Unit </li></ul><ul><li>The unit typically used in the sciences are those of the International System of Units. </li></ul>Quantity SI base Unit Symbol Length Meter m Mass Kilogram kg Temp Kelvin K Time Second s Amount of substance Mole mol
4. 4. <ul><li>Some number used in science are just too big to write out… </li></ul><ul><li>For example: </li></ul><ul><li>There are a 602,000,000,000,000,000,000 hydrogen atoms in a gram of hydrogen. </li></ul><ul><li>An atom of Au has a mass of 0.000000000000000000000327 gram </li></ul><ul><li>So what do we do? </li></ul>
5. 5. <ul><li>A number in scientific notation is a product of two numbers: </li></ul><ul><li>A coefficient (1≤X<10) </li></ul><ul><li>10 raised to a power </li></ul><ul><li>Ex: 645,000 </li></ul><ul><li>Scientific notation: 6.45 X 10 5 </li></ul><ul><li>This is the same as saying 6.45 X 10 X 10 X 10 X 10 X 10 </li></ul>
6. 6. <ul><li>Ex: 0.000045 </li></ul><ul><li>Scientific Notation: 4.5 X 10 -5 </li></ul><ul><li>This is the same as saying 4.5 ÷ 10 ÷ 10 ÷ 10 ÷ 10 ÷ 10 </li></ul>
7. 7. <ul><li>Ex: 7.054 X 10 6 </li></ul><ul><li>Ex: 4.7 X 10 -7 </li></ul>