1. I. Units of Measurement (p. 33 - 39)
CH. 2 - MEASUREMENT
I. Units of Measurement
(p )
Le System International d Unites -- International System of Units (SI)
Some non-SI units used (liter, gram)

2. A. Number vs. Quantity Quantity - number + unit UNITS MATTER!!
Quantity represents magnitude, size, amount
Unit represents how quantity is measured
UNITS MATTER!!

3. B. SI Units Quantity Symbol Base Unit Abbrev. Length l meter m Mass m
kilogram kg
Time t
second s
Go through each base unit and what represented.
Use overhead trans.
Temp T
kelvin K
Amount n
mole
mol

4. B. SI Units Prefix Symbol Factor mega- M 106 kilo- k 103 BASE UNIT ---
100
deci- d
10-1
centi- c
10-2
Go through, use overhead transp.
Discuss various objects and get suggestions of which would be the best unit to measure
Mouse
Car
Distance to KC
Amount of water in pool
Distance to Mars/Moon
Mass of elephant
Size of bacteria
Figure 2-4: determine width of foil ( work on uncertainty of measurements)
milli- m
10-3
micro- 
10-6
nano- n
10-9
pico- p
10-12

5. C. Mass vs Weight
Mass -- amount of “stuff” with volume that is compared to a standard.
Weight -- effect of gravity on mass.
Balance measures mass by “canceling” effect of gravity.
Scale measure weight & gravity.
Which one changes? Where?

6. M V D = D. Derived Units 1 cm3 = 1 mL 1 dm3 = 1 L
Combination of base units.
Volume (m3 or cm3)
length  length  length
1 cm3 = 1 mL
1 dm3 = 1 L
D = M V
Density demo: p. 37 (Dancing raisins) Explain observation.
Many derived units (see table/transp. Pg. 36)
Area, volume, density, molar mass will be common used
Density (kg/m3, g/cm3, or g/ml)
mass per volume

7. E. Density
Mass (g)
Volume (cm3)

8. F. Density V = 825 cm3 M = DV D = 13.6 g/cm3 M = (13.6 g/cm3)(825cm3)
An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass.
GIVEN:
V = 825 cm3
D = 13.6 g/cm3
M = ?
WORK:
M = DV
M = (13.6 g/cm3)(825cm3)
M = 11,200 g

9. G. Density D = 0.87 g/mL V = M V = ? M = 25 g V = 25 g 0.87 g/mL
A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid?
GIVEN:
D = 0.87 g/mL
V = ?
M = 25 g
WORK:
V = M D
V = g
0.87 g/mL
V = 29 mL