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CHAPTER 2 REVIEW
Measurements and Calculations
SECTION 2-1
SHORT ANSWER
Answer the following questions in the space provided.
1. Determine whether the following are examples of observations and data, a theory, a hypothesis, a
control, or a model.
a. A research team records the rainfall in inches
per day in a prescribed area of the rain forest. The
square footage of vegetation and relative plant density
per square foot are also measured.
b. The intensity of the precipitation, the duration,
and the time of day are noted for each precipitation
episode. The types of vegetation in the area are logged
and classified.
c. The information gathered is compared with the
data on the average precipitation and the plant
population collected over the last 10 years.
d. The information gathered by the research team
indicates that rainfall has decreased significantly. They
propose that deforestation is the primary cause of this
phenomenon.
2. “When 10.0 g of white, crystalline sugar is dissolved into 100. mL of water, the system is observed
to freeze at 0.54°C, not 0.0°C. The system is denser than pure water.” Identify which parts of
these statements represent quantitative information and which parts represent qualitative
information.
3. Compare and contrast a model with a theory.
MODERN CHEMISTRY
HRW material copyrighted under notice appearing earlier in this work.
SECTION 2-1 REVIEW
9
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Name ______________________________________ Date ____________ Class _______________________
Modern Chemistry • CHAPTER 2
HOMEWORK 2-3
(pp. 36–40)
VOCABULARY
Complete each sentence.
1. A derived unit is formed from _______________________________________________________.
2. The mass of an object divided by the amount of substance is the __________________.
This derived unit is abbreviated __________________.
3. The volume of an object is ___________________________________________________________.
4. The density of an object is the ratio of its ________________________________________________.
5. If the temperature of an object increases, the object’s density usually __________________.
SKILL BUILDING
Complete the following chart by calculating the missing mass, volume, or density
in each row.
Element
Mass
Volume
Aluminum
46.4 g
Calcium
84.3 g
Magnesium
Oxygen
Silver
8.90 g/cm3
12.0 g
142.83 g
19.32 g/cm3
0.0899 g/L
3
81.85 cm
28.76 g
1.429 g/L
246.52 g
10.5 g/cm3
49.1 cm3
Sulfur
Zinc
1.54 g/cm3
8.63 cm3
Gold
Hydrogen
17.17 cm
833 cm3
Cobalt
Density
3
118.79 g
16.64 cm3
STANDARDIZED TEST PREP
Circle the letter of the best answer.
1. Which statement is true?
a. The density of an object does not depend on the size of the sample.
b. An object’s density is expressed in the base unit pascals.
c. If an object floats on a liquid, the object is denser than the liquid.
d. Density readings are not dependent upon the temperature of a substance.
2. Object A and Object B are the same size, but Object A is heavier than Object B.
Which statement about the objects is always true?
a. Object A and Object B are the same substance.
b. Object B has less gravitational pull than Object A.
c. Object B is at a greater temperature than Object A.
d. Object A is denser than Object B.
Modern Chemistry
Copyright © by Holt, Rinehart and Winston. All rights reserved.
1.96 g/cm3