1. Measuring and CalculatingX 
Chapter 2 
Measuring and Calculating
HOMEWORK DUE: Turn in Lab 5 Make sure each
group member’s name is on the
front page.
HW 8: Outline Chap 2
Due Friday: HW 9; handout from sciencespot.net

2. Math Problem Solving
Identify: What do you know from the problem. Underline it!
Identify: What are you trying to find. Underline it!
Identify what equations or conversion factors match what you know and what you want to know.
Write out the equation – plug in the numbers – then estimate the answer.
Finally, press the correct buttons on your calculator – and you are done!

3. Key Terms: 15 points, Turn in Today
Percent error
Significant Digits
Derived units
density (g/cm3) or
(g/ml)
counting number
prefix
kilo
deci
milli
micro
Mass (kg)
Weight (lbs)
Volume (ml or L)
balance (g)
length (cm or m)
time (sec)
temperature (oC or K)
Accuracy
Precision
Find the definition for each, write
a sentence using the word correctly.

4. Scientific notation: Write the decimal represented by the scientific notation.
0.0001
0.001
0.01
0.1 1 10
100
1000
10000
1 x 10-6
1 x 10-5
1 x 10-4
1 x 10-3
1 x 10-2
1 x 10-1
1 x 10-0
1 x 101
1 x 102
1 x 103
1 x 104

5. Prefixes Mega (M) Million 1 000 000 1x106 kilo (k) thousand 1 000
base unit
( )
one 1
1 x 100
deci (d)
one tenth
0.1
1 x 10-1
centi (c)
one hundredth
0.01
1 x 10-2
milli (m)
one thousandth
0.001
1 x 10-3

6. practice: Use the prefix to make this number 1.00
1,000 grams
0.01 grams
0.1 liters
1,000 liters
1 x 103 m
1 x 10-3 m
1 x 100 g
1 x 10-2 liters
1 kilogram
1 centigram
1 deciliter
1 kiloliter
1 kilometer
1 millimeter
1 gram
1 centiliter

7. Practice converting between units.
1 m
20 cm = ____ m
3000 mm = ______ m
2.85 m = ________km
62.4 g = ________kg
19.5 L = ______cL
0.12 L = ______mL
0.305 L = _____mL
0.20
20 cm
100 cm 3. cm
3000 mm
1 m
1000 mm mm

8. Practice converting between units.
20 cm = ____ m
3000 mm = ____m
2.85 m = ______km
62.4 g = ______kg
19.5 L = ______cL
0.12 L = ______mL
0.305 L = _____mL
0.2 3
1 km
2.85 m
2.85 x 10-3
1000 m m
6.24 x 10-2
62.4 g
1.00 kg
1000 g g

9. Practice converting between units.
20 cm = ____ m
3000 mm = ____m
2.85 m = ______km
62.4 g = ______kg
19.5 L = ______cL
0.12 L = ______mL
0.305 L = _____mL
0.2 3
100 cL
19.5 L
2.85 x 10-3 1 L
6.24 x 10-2
0.12 L
1000 mL
1950
120 L
1.0 L
305

10. Metric Conversions the easy way!1
1000 mg = _____ g
1L = _____mL
160 cm = _____ mm
14 km = ______m
0.109
109 g = _______ kg
250 m = _____km
56 cm O 6 m
7g O 698 mg
0.25
1000
1600
<
14000
<
Practice: Notes, 1 – 21 are homework

11. Density: how much mass per unit volume?
Volume is measured in three dimensional quantities: mL, L, cm3, m3,…
Mass is measured in g, kg,…
Density is a “derived unit” of g/ml or g/cm3 or g/L or kg/L,….
Mass = Density x Volume
Density = Mass
Volume
Volume = Mass
Density

12. Density = mass/volume
What is the density of a piece of concrete that has a mass of 8.76g and a volume of 3.07 cm3
Density = Mass
Volume
mass = g
density = ?
Volume = 3.07 cm3
Mass = Density x Volume
density = 8.76 g
3.07 cm3
= 2.85 g/cm3
Volume = Mass
Density

13. Density = mass/volume
Limestone has a density of 2.72 g/cm3. What is the mass of 24.9 cm3 of limestone?
Density = Mass
Volume
mass = ?
density = 2.72 g/cm3
Volume = 24.9 cm3
Mass = Density x Volume
Volume = Mass
Density
mass = (2.72 g/cm3)(24.9 cm3)
= 67.7 g