1. Scientific Notation

2. www.brainybetty.com2 Scientific Notation Used for very large or very small numbers, to make life easier Wavelength of an X-ray –0.0000000001 m Avogadro’s Number: –602000000000000000000000

3. www.brainybetty.com3 To change… From regular to sci notation, move (and count) the decimal 0.0000000001 m –Move decimal to the right 10 places –1 x 10 -10 m 602000000000000000000000 –Move decimal to left 23 places –6.02 x 10 23

4. www.brainybetty.com4 To change… From sci notation to regular, add zeroes by moving decimal 1 x 10 -10 m –Move decimal to the left 10 places and fill in with zeroes –0.0000000001 6.02 x 10 23 –Move decimal to the right 23 places and fill in with zeroes –602000000000000000000000

5. www.brainybetty.com5 Using a Calculator Enter number – like 6.02 Push EE or EXP Enter exponent – like 23 DON’T enter the “10 x” on the calculator!

6. www.brainybetty.com6 Sci Notation and Sig Figs Sci notation can make sig figs much easier Focus on number, not the exponent –3.25 x 10 5 3 –1.0 x 10 2 2 See how this removes the confusion of 100?