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Modern Chemistry • CHAPTER 1
HOMEWORK 1-5
(pp. 17–19)
VOCABULARY
Select the term in Column B that is most closely related to each term in Column A.
Column A
Column B
1. pure substance _____
a. stainless steel
2. element _____
b. hydrogen
3. homogeneous mixture _____
c. sucrose
4. heterogeneous mixture _____
d. blood
GRAPHIC ORGANIZER
On a separate sheet of paper, use a Venn diagram to compare and contrast mixtures with pure
substances. Show as many comparisons (similarities) and contrasts (differences) as you can.
Pure Substances
Mixtures
STANDARDIZED TEST PREP
Circle the letter of the best answer.
1. When sucrose is subjected to intense heating, it
a. decomposes into hydrogen and oxygen.
b. produces a reddish flame.
c. breaks down to produce carbon and water.
d. materializes into hard clumps of sugar.
2. It is important for researchers to know about chemical impurities because
a. an impurity could affect a reaction’s results.
b. impure chemicals cannot be used in research.
c. the technical grade is always the highest grade possible for a chemical.
d. impure chemicals cannot be broken down into other substances.
Modern Chemistry
Copyright © by Holt, Rinehart and Winston. All rights reserved.
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CHAPTER 1
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• HOMEWORK 1-4
VOCABULARY
1. a homogeneous, or uniform, mixture
2. a blend of two or more kinds of matter, each retaining its properties
3. a mixture that is not uniform
4. Energy can be absorbed or released, but it cannot be destroyed or created.
SKILL BUILDER
Answers should reflect the methods described on page 16, such as filtration to separate a liquid from
a solid.
STANDARDIZED TEST PREP
1. d
2. a
CHAPTER 1
• HOMEWORK 1-5
VOCABULARY
1. c
2. b
3. a
4. d
GRAPHIC ORGANIZER
Sample responses: Comparisons: Both may be able to be decomposed. Both can be made of matter. Both
may take the form of liquid, solid, or gas. Contrasts: Every sample of a pure substance has exactly the
same characteristic properties. Properties of a mixture depend on the relative amounts of the mixture’s
components. Every sample of a pure substance has the same composition.
STANDARDIZED TEST PREP
1. c
2. a
CHAPTER 1
• HOMEWORK 1-6
VOCABULARY
1. the organization of elements based on their chemical properties
2. vertical columns of elements on the periodic table
3. horizontal rows of elements in the periodic table
4. an element that is a good conductor of heat and electricity
SKILL BUILDING
1. Each group contains elements with similar chemical properties. Physical and chemical properties
change somewhat regularly across a period.
2. The two types of elements are metals and nonmetals. The metals are at the left and in the center of
the table, while the nonmetals are on the right.
STANDARDIZED TEST PREP
1. c
2. b