1. Ch. 1: “Introduction to Science”
Section 3: “Organizing Data”

2. 1. Describe the kind of data best displayed as a line graph.
A line graph is best for displaying data that change. See Figure 1-17 pg. 21.

4. 2. Describe the kind of data that is best displayed as a pie chart.
A pie chart is ideal for displaying data that are parts of a whole. See Figure 1-19 pg. 22.

6. 3. Explain in your own words the difference between accuracy & precision.
Accuracy is the degree of correctness while precision is the degree of reproducibility.

8. They both weigh the same, one pound.
4. Critical Thinking: An old riddle asks, Which weighs more, a pound of feathers or a pound of lead? Answer the question, & explain why you think people sometimes answer incorrectly.
They both weigh the same, one pound.
The difference between a pound of feathers and a pound of lead is the volume. A pound of feathers would be a large bag of feathers, but a pound of lead can easily be held in your hand.

9. 5. Convert the following measurements to scientific notation:
a mm3 = b kg = c mL = d mol =
1.54 X 104 mm3 3.3 X 10-4 kg 2.05 X 103 mL 1.5 X 10-5 mol

10. 6. Calculate the following:
a. (3.16 X 103 m)(2.91 X 104 m) = m2 = X 107 m2 b. (1.85 X 10-3 cm)(5.22 X 10-2 cm) = cm2 = X 10-5 cm2 c X 105 g ÷ 1.35 X 105 cm3 = g/cm3

11. 7. Calculate the following, & round the answers to the correct number of significant figures.
a. (54.2 cm) (22 cm) = cm2 = 1.2 X 103 cm2 b m ÷ 89 s = m/s = 2.6 X 102 m/s