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Science Assignment Reminder: Prefix Practice and Unit Conversion

Prepare for your science assignment on scientific notation, prefixes, and unit conversion. Remember to review the table and practice problems before the quiz. Understand the importance of prefixes in capturing physical magnitudes accurately.

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Science Assignment Reminder: Prefix Practice and Unit Conversion

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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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