1. Phenomenon: Chemists use units to express different types of measurements.

2. The Metric System & its Unit Conversions
Base Units
Measures
second (s)
meter (m)
liter (L)
gram (g)
temperature
quantity of substance
pressure

3. ~~~~~~~~ ~~~~~~~~~~~~ BASE UNITS ~~~~~~~~~~~~~~~~
The 6 Major Prefixes
The Big & The Small
Prefix
Symbol
Meaning
Example
Thousand
1 kg = 1,000 g
Hundred
1 hg = 100 g
Ten
1 Dg = 10 g
~~~~~~~~ ~~~~~~~~~~~~ BASE UNITS ~~~~~~~~~~~~~~~~
Tenth (0.1)
10 dg = 1 g
Hundredth (0.01)
100 cg = 1 g
Thousandth (0.001)
1000 mg = 1 g

4. The Ladder Method

5. The Ladder Method K H D d c m 4 km = _________ m 12 Dg = _________ dg
Meters Liters Grams
4 km = _________ m
12 Dg = _________ dg
Starting Point
Ending Point

6. The Ladder Method K H D d c m
Meters Liters Grams
Try these conversions using the ladder method.
1000 mg = _______ g 1 L = _______ mL 160 cm = _______ mm
14 km = _______ m 109 g = _______ kg 250 m = _______ km
56 cm m 7 g mg
Compare using <, >, or =.

7. The Ladder Method K H D d c m
Meters Liters Grams
Which of the following measurements are the equivalent?
25 g
2500 dg
2500 mg
.025 kg

8. Dimensional Analysis
An analysis of the relationship between different units of measure using conversion factors.

9. Dimensional Analysis
An analysis of the relationship between different units of measure using conversion factors.
Convert 3598 grams into pounds. (1 lb = 454 g)

10. Dimensional Analysis
An analysis of the relationship between different units of measure using conversion factors.
Convert 5 miles to inches. (1mi = 5280 ft; 1 ft = 12 in)

11. Dimensional Analysis
An analysis of the relationship between different units of measure using conversion factors.
How many seconds pass by if you sleep for 8 hours?