1. Scientific Notation # from 1 to 9.999 x 10 exponent 800= 8 x 10 x 10 = 8 x 10 2 2531 = 2.531 x 10 x 10 x 10 = 2.531 x 10 3 0.0014 = 1.4 ÷ 10 ÷ 10 ÷ 10 = 1.4 x 10 -3

2. Change to standard form. 1.87 x 10 –5 = 3.7 x 10 8 = 7.88 x 10 1 = 2.164 x 10 –2 = 370,000,000 0.0000187 78.8 0.02164

3. Change to scientific notation. 12,340 = 0.369 = 0.008 = 1,000. = 1.234 x 10 4 3.69 x 10 –1 8 x 10 –3 1.000 x 10 9

4. No Cussing! The following 4-Letter words are forbidden here: Inch Mile Foot Pint Yard Acre And we never swear the BIG F (use o C) Please keep it clean and Metric

5. SI System The International System of Units Derived Units Commonly Used in Chemistry Map of the world where red represents countries which do not use the metric system

6. The International System of Units Lengthmeter m Masskilogram kg Timesecond s Amount of substancemole mol TemperatureKelvin K Electric currentamperes amps Luminous intensitycandela cd QuantityNameSymbol Dorin, Demmin, Gabel, Chemistry The Study of Matter, 3 rd Edition, 1990, page 16

7. NEED TO KNOW Prefixes in the SI System Power of 10 for Prefix SymbolMeaning Scientific Notation _________________________________________________________ mega-M 1,000,00010 6 kilo-k 1,00010 3 deci-d 0.110 -1 centi-c 0.0110 -2 milli-m 0.00110 -3 micro-  0.00000110 -6 nano-n 0.00000000110 -9

8. Significant figures Method used to express accuracy and precision. You can’t report numbers better than the method used to measure them. 67.20 cm = four significant figures Uncertain Digit Certain Digits ???

9. Significant figures The number of significant digits is independent of the decimal point. 255 31.7 5.60 0.934 0.0150 These numbers All have three significant figures!