2. Measurement

3. The SI System of Measurement The International System of Units (abbreviated SI) is the modern form of the metric system and is the world's most widely used system of measurement, used in both everyday commerce and science.

4. Units of Measurement length = meters (m) mass = kilograms (kg) liquid volume = liters (L) solid volume = cubic centimeters (cm 3 ) temperature = Kelvin (K) time = seconds (s)

5. Reporting Measurements Report what is known with certainty Add ONE digit of uncertainty (estimation) Davis, Metcalfe, Williams, Castka, Modern Chemistry, 1999, page 46

7. Measuring Length Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 122

8. Practice Measuring Timberlake, Chemistry 7 th Edition, page 7 cm 0 12345 0 12345

9. Practice Measuring 4.5 cm Timberlake, Chemistry 7 th Edition, page 7 cm 0 12345 0 12345

10. Practice Measuring 4.5 cm 4.55 cm Timberlake, Chemistry 7 th Edition, page 7 cm 0 12345 0 12345

11. Christopherson Scales Made in Normal, Illinois USA Measuring Mass 1 kg = 2.20 lb 1 kg (1000 g) 1 lb 0.20 lb

12. Reading a Triple Beam Balance

13. 272.09 grams

14. Measuring Liquid Volume Graduated cylinder SyringeVolumetric flask BuretPipet

15. 100 mL Graduated Cylinder Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 119

16. Reading a Meniscus 10 8 6 line of sight too high reading too low reading too high line of sight too low proper line of sight reading correct graduated cylinder 10 mL

17. 20 10 15 mL ? 15.0 mL

18. Measuring Solid Volume

19. V = L x W x H

20. Measuring Solid Volume V = L x W x H V = 7cm x 4cm x 3cm

21. Measuring Solid Volume V = L x W x H V = 7cm x 4cm x 3cm V = 84 cm 3

22. Water Displacement

23. How to Read a Thermometer (Celcius) 10 5 0 4.0 o C 10 5 0 8.5 o C 100 50 0 65 o C

24. 0oC0oC 10 o C 20 o C 30 o C 40 o C 50 o C 60 o C 0oC0oC 1oC1oC 2oC2oC 3oC3oC 4oC4oC 5oC5oC 6oC6oC 0oC0oC 5oC5oC 10 o C 15 o C 20 o C 25 o C 0oC0oC 20 o C 40 o C 60 o C 80 o C 100 o C 0oC0oC 20 o C 40 o C 60 o C 80 o C 100 o C Record the Temperature (Celcius) A B C D E 30.0 o C 3.0 o C19.0 o C 48.0 o C 60.0 o C