CHAPTER 2, Section 1
CHAPTER 2, Section 2
1. What is the scientific method?
2. Which of the following are quantitative?
a. The liquid floats on water.
b. The metal is malleable.
c. The liquid has a temperature of 55.6°C.
3. How do hypotheses and theories differ?
4. How are models related to theories and hypotheses?
1. Why are standards needed for measured quantities?
2. Write conversion factors for each equality.
a. 1 m3 = 1 000 000 cm3
b. 1 in. = 2.54 cm
c. 1 µg = 0.000 001 g
d. 1 Mm = 1 000 000 m
3. a. What is the density of an 84.7 g sample of an unknown substance if the sample occupies 49.6 cm3?
b. What volume would be occupied by 7.75 g of
this same substance?
CHAPTER 2, Section 3
2. Determine the number of significant figures.
a. 6.002 cm
b. 0.0020 m
c. 10.0500 g
d. 7000 kg
e. 7000. kg
3. Perform the following operations. Express each answer in scientific notation.
a. (1.54 × 10 -2 g) + (2.86 × 10 -1 g)
b. (7.023 × 109 g) – (6.62 × 107 g)
c. (8.99 × 10 -4 m) × (3.57 × 104 m)
d. 2.17 × 10 -3 g __ 5.002 × 10 4 mL
1.
a. What is the density of an 84.7 g sample of an unknown substance if the sample occupies 49.6 cm3?
b. What volume would be occupied by 7.75 g of this same substance?