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Happy you’re back ! Turn in: Letters and Homework 1B

Happy you’re back ! Turn in: Letters and Homework 1B. Check for textbooks Friday ???. Review: Two ways to capture the wide range in physical magnitudes…. Scientific notation Prefixes. Prefixes are symbolic versions of powers of 10. Example: 10 -3 = m= milli.

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Happy you’re back ! Turn in: Letters and Homework 1B

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  1. Happy you’re back ! Turn in: Letters and Homework 1B Check for textbooks Friday ???

  2. Review: Two ways to capture the wide range in physical magnitudes…. • Scientific notation • Prefixes

  3. Prefixes are symbolic versions of powers of 10 Example: 10-3 = m= milli

  4. YOUR Third (3rd) ASSIGNMENT: By Friday 26 Jan, get this table in your head (quiz on it this Friday) see also- Text table 1.2 p. 9

  5. Boardwork Prefix practice 6.1 *10-9 m =6.1 nm 3.2 *108 s =320 Ms 4.6 *10-8 g =46 ng

  6. Clicker practice

  7. You are taking Chemistry 1114 because… • I love chemistry and want to be a chemist. • My curricular program forces me to take it. • I’m a sick masochist who revels in pain. • Oops, I thought this was LITR 2603.

  8. Best, prefixed version of 6*10-5 m • 0.6 Mm • 0.06 mm • 60 m • 6 dm

  9. What is the best, prefixed version for 6000 s ? • 0.006 Ms • 6 ks • 6 *103 s • 6 ms

  10. What is the best, prefixed version of 8*10-8 g ? • 80 ng • 0.08 g • 80000 ng • 800 g

  11. More prefix selection problems practice ??

  12. The problem with prefixes…

  13. There are many competing choices of prefixes for a given quantity in chemistry (and physics and biology) Nobody follows the rules…… “How do I convert between these %%&! prefix systems ?” EXAMPLE Common prefix units used to define wavelength, : • m • nm • pm • mm (millimicron) • Å =10-1 nm

  14. 15 m = ??? pm

  15. How to convert ??? Method 1) Algebraic (‘Marine’ way) Doc’s story about his HS chem teacher Divide and conquer, maggot !

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