1. The SI System of Measurement

2. The Nature of Measurement
A Measurement is a quantitative observation consisting of TWO parts
Part 1 - number
Part 2 - scale (unit)
Examples:
20 grams
6.63 x Joule·seconds

3. The Fundamental SI Units (le Système International, SI)

4. SI Prefixes Common to Chemistry
Unit Abbr.
Exponent
Kilo k
103
Deci d
10-1
Centi c
10-2
Milli m
10-3
Micro 
10-6

5. Metric Conversions g m L 103 102 101 10-1 10-2 10-3 kilo hecto deka
Base
unit
deci
centi
milli
Conversions in the metric system are merely a matter of moving a decimal point. The “base unit” means the you have a quantity (grams, meters, Liters, etc without a prefix.

6. Metric Conversions g m L 103 102 101 10-1 10-2 10-3 kilo hecto deka
Base
unit
deci
centi
milli 1 2 3
18 L
18 liters = milliliters
Example #1: Convert 18 liters to milliliters

7. Metric Conversions g m L 103 102 101 10-1 10-2 10-3 kilo hecto deka
Base
unit
deci
centi
milli 3 2 1
450 mg = g
450 mg
Example #2: Convert 450 milligrams to grams

8. Metric Conversions g m L 103 102 101 10-1 10-2 10-3 kilo hecto deka
Base
unit
deci
centi
milli 1 2 3 4 5 6
20 kg
20 kg = mg
Example #3: Convert 20 kilograms to milligrams

9. Metric Conversion Practice-Dimensional Analysis
Decimal Ladder

10. DA format Given unit always goes first new unit = Given unit new unit

11. Problem #1 Convert 400 mL to Liters 400 mL 1 L .400 L = 1 000 mL
= 4x10-1 L

12. Problem #2 Convert 10 meters to mm 10 m 1 000 mm 10 000 mm = 1 m
= 1x104 mm

13. Problem #3 Convert 73 grams to kg 73 g 1 kg 0.073 kg = 1 000 g
= 7.3x10-2 kg

14. M
Convert 0.02 kilometers to m
0.02 km
1 000 m 20 m = 1 km
= 2x101 m

15. 4
Convert 20 centimeters to m
20 cm 1 m
0.20 m =
100 cm
= 2x10-1 m

16. 2
Convert 450 milliliters to dL
450 mL 1 dL
4.5 dL =
100 mL

17. 1 Convert 10 kilograms to grams 10 kg 1 000 g 10 000 g = 1 kg
= 1x104 g

18. Temperature Change
KoC (-273) oCK (+273)

19. Problem #5
Convert 45oC to K + =
45 oC
273
318K

20. Problem #6
Convert K to oC
746K -
273 =
473K

21. Molar Conversions Mole-the amount of a substance
1 mol of any substance equals 6.022x1023 particles
atoms
molecules
Take a look at the Periodic Table of Elements
1 mol of Na is g
1 mol of H20 is 18.02g

22. Molar Mass 55.85 1 The amount of matter in 1 mole 10.81 g B in 1 mol B
58.69 g Ni in 1 mol Ni
______ g Fe in 1 mol Fe
12.01 g C in ___ mol C
55.85 1

23. Problem #7 Convert 54g Na to mol Na 1 mol Na 54 g Na 2.4 = 23 g Na

24. Problem #8 6.3 mol Al to g Al 26.98 g Al = 1 mol Al 6.3 mol Al 170

25. Problem #10 Convert 175 mL to cm3 1 cm3 175 mL 175 cm3 = 1 mL
= 1.75x102 cm3