150 likes | 156 Views
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.
E N D
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
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
Boardwork Prefix practice 6.1 *10-9 m =6.1 nm 3.2 *108 s =320 Ms 4.6 *10-8 g =46 ng
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.
Best, prefixed version of 6*10-5 m • 0.6 Mm • 0.06 mm • 60 m • 6 dm
What is the best, prefixed version for 6000 s ? • 0.006 Ms • 6 ks • 6 *103 s • 6 ms
What is the best, prefixed version of 8*10-8 g ? • 80 ng • 0.08 g • 80000 ng • 800 g
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 • mm (millimicron) • Å =10-1 nm
How to convert ??? Method 1) Algebraic (‘Marine’ way) Doc’s story about his HS chem teacher Divide and conquer, maggot !