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MEASUREMENT: Ch. 2

MEASUREMENT: Ch. 2. Using Measurements. I. Units of Measurement. II. Unit Conversions. III. Honors Chem 1. MEASUREMENT: Ch. 2. Units of Measurement (p.33 - 39). A. Number vs. Quantity. Measurements represent quantities Quantity is a number + unit. UNITS MATTER!!. B. SI Units.

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MEASUREMENT: Ch. 2

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  1. MEASUREMENT: Ch. 2 Using Measurements I Units of Measurement II Unit Conversions III Honors Chem 1

  2. MEASUREMENT: Ch. 2 Units of Measurement (p.33 - 39)

  3. A. Number vs. Quantity Measurements represent quantitiesQuantity is a number + unit UNITS MATTER!!

  4. B. SI Units • scientists use one common measurement system • Le Systéme International d’Unités, or SI • Allows scientists to compare their research findings all over the world!

  5. B. SI Units Quantity Symbol Base Unit Abbrev. Length l meter m Mass m gram g Time t second s Temp T kelvin K Amount n mole mol

  6. B. SI Units K H D b d c m _ _  _ _ n _ _ p kilo deci nano pico centi micro milli base unit

  7. Board & Buddy • Shoulder partner • One person grab a white board & marker • Write which unit would be best for the following situations- talk it out!

  8. Which unit would be best? distance between Nashville and Orlando

  9. Which unit would be best? animal track size

  10. Which unit would be best? how long to complete the Nashville Rock n Roll Marathon (26.2 miles)

  11. Which unit would be best? size of a paper clip

  12. Which unit would be best? how far from street to the top of Big Ben

  13. Which unit would be best? amount in a jug of milk

  14. Which unit would be best? thickness of a piece of hair

  15. Which unit would be best? lemon

  16. Which unit would be best? thickness of a single piece of newspaper

  17. Which unit would be best? teaspoon of salt

  18. Which unit would be best? distance to the moon

  19. m V D = C. Derived Units • combination of base units • volume (m3 or cm3) length  length  length 1 cm3 = 1 mL 1 dm3 = 1 L • density (g/mL or g/cm3)mass per volume

  20. D. Density directly proportional! Mass (g) Volume (cm3)

  21. m m m m D D D D V V V V D. Density D = m V m = DV V = m D

  22. Example #1 • An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass. m = DV m = (13.6 g/cm3)(825cm3) m = 11,200 g m = 1.12 x 104 g

  23. WORK: V = m D V = 25 g 0.87 g/mL Example #2 • A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid? V = 29 mL

  24. E. Converting temperatures • Celcius (°C) • Kelvin (K) • Fahrenheit (°F) K = °C + 273 °C = K - 273

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