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Chapter 1, continued
Section 2: Describing Matter (p. 11)
1. In a game of 20 Questions, the most helpful questions you can
ask are about the
of the object.
Physical Properties (p. 11)
2. Which physical properties is the person in the picture on page 11
asking about?
Match each physical property in Column B to the correct phrase in
Column A, and write the corresponding letter in the appropriate
space. Use the table on page 12 to help you.
Column B
3. Sand does not dissolve in water.
a. state
4. Gold can be made into gold foil.
b. thermal conductivity
5. Ice is the solid form of water.
c. solubility
6. Copper can be drawn out into wire.
d. density
7. A foam cup protects your hand from being
burned by the hot chocolate the cup contains.
e. ductility
f. malleability
8. Ice cubes float in a glass of water.
9. In the formula for density, D means
V stands for
,
, and m stands for
.
10. What are two reasons why density is a useful property for
identifying substances?
12
HOLT SCIENCE AND TECHNOLOGY
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Column A
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CHAPTER 1
Chapter 1, continued
11. Using the table on page 13, list the elements mercury, water,
gold, and oxygen from the densest to the least dense.
12. What will happen if you shake the jar in Figure 12? Explain.
▼
▼
▼
13. Is 40 mL of oil denser than 25 mL of vinegar?
14. Density is dependent on the amount of substance you have.
Copyright © by Holt, Rinehart and Winston. All rights reserved.
True or False? (Circle one.)
Review (p. 14)
Now that you’ve finished the first part of Section 2, review what
you’ve learned by answering the Review questions in your
ScienceLog.
Chemical Properties (p. 15)
15. Which of the following are true of chemical properties?
(Circle all that apply.)
a.
b.
c.
d.
They
They
They
They
indicate a substance’s ability to change identity.
indicate one substance’s ability to react with another.
describe matter.
can be observed with your senses.
16. In Figure 13, on page 15, why isn’t there rust in the painted areas
of the car?
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13
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Chapter 1, continued
Physical vs. Chemical Properties (p. 16)
17. Characteristic properties help scientists to distinguish one
substance from another. True or False? (Circle one.)
18. Which of the following represents ONLY physical properties? The
table on page 16 may help you.
a.
b.
c.
d.
flammable, dense, malleable
malleable, reactive, dense
powdery, dense, red
clear, grainy, nonflammable
Physical Changes Don’t Form New Substances
19. What is a physical change?
(p. 16)
20. If you make a physical change to a substance, the identity of the
substance changes. True or False? (Circle one.)
21. Many physical changes are
undo. (easy or difficult)
to
22. A chemical
(p. 17)
describes a substance’s
ability to change. A chemical
occurs when a substance turns into another substance.
23. How do you know that baking a cake involves chemical changes?
24. In Examples of Chemical Changes, the odor of sour milk indicates
a chemical change has taken place. True or False? (Circle one.)
25. Some chemical changes can be reversed with more chemical
changes. True or False? (Circle one.)
Review (p. 19)
Now that you’ve finished Section 2, review what you learned by
answering the Review questions in your ScienceLog.
14
HOLT SCIENCE AND TECHNOLOGY
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Chemical Changes Form New Substances
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Name _______________________________________________ Date ________________ Class______________
Chapter 1, continued
Section 2: Describing Matter (p. 11)
1. In a game of 20 Questions, the most helpful questions you can
ask are about the
properties
of the object.
Physical Properties (p. 11)
2. Which physical properties is the person in the picture on page 11
asking about?
The person in the illustration is asking about the physical properties of
color, odor, and mass (or volume).
Match each physical property in Column B to the correct phrase in
Column A, and write the corresponding letter in the appropriate
space. Use the table on page 12 to help you.
Column B
c
3. Sand does not dissolve in water.
a. state
f
4. Gold can be made into gold foil.
b. thermal conductivity
a
5. Ice is the solid form of water.
c. solubility
e
6. Copper can be drawn out into wire.
d. density
b
7. A foam cup protects your hand from being
burned by the hot chocolate the cup contains.
e. ductility
d
8. Ice cubes float in a glass of water.
9. In the formula for density, D means
volume
V stands for
mass
density
, and m stands for
.
10. What are two reasons why density is a useful property for
identifying substances?
Density is a useful property for identifying substances because a
substance’s density is always the same at a given temperature and
pressure and because most substances have different densities.
12
HOLT SCIENCE AND TECHNOLOGY
f. malleability
,
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Column A
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CHAPTER 1
Chapter 1, continued
11. Using the table on page 13, list the elements mercury, water,
gold, and oxygen from the densest to the least dense.
gold, mercury, water, oxygen
12. What will happen if you shake the jar in Figure 12? Explain.
▼
▼
▼
Sample answer: If I shake the jar, the liquids might mix for a minute, but
then they’ll separate into layers. They separate into layers because the
liquids have different densities. The green (densest) liquid will settle to the
bottom.
13. Is 40 mL of oil denser than 25 mL of vinegar?
no
14. Density is dependent on the amount of substance you have.
Copyright © by Holt, Rinehart and Winston. All rights reserved.
True or False? (Circle one.)
Review (p. 14)
Now that you’ve finished the first part of Section 2, review what
you’ve learned by answering the Review questions in your
ScienceLog.
Chemical Properties (p. 15)
15. Which of the following are true of chemical properties?
(Circle all that apply.)
a.
b.
c.
d.
They
They
They
They
indicate a substance’s ability to change identity.
indicate one substance’s ability to react with another.
describe matter.
can be observed with your senses.
16. In Figure 13, on page 15, why isn’t there rust in the painted areas
of the car?
There isn’t rust in the painted areas of the car because the paint provides a
barrier between oxygen and the steel, which prevents oxygen from reacting
with the iron in the steel to form rust.
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13
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Name _______________________________________________ Date ________________ Class______________
Chapter 1, continued
Physical vs. Chemical Properties (p. 16)
17. Characteristic properties help scientists to distinguish one
substance from another. True or False? (Circle one.)
18. Which of the following represents ONLY physical properties? The
table on page 16 may help you.
a.
b.
c.
d.
flammable, dense, malleable
malleable, reactive, dense
powdery, dense, red
clear, grainy, nonflammable
Physical Changes Don’t Form New Substances
19. What is a physical change?
(p. 16)
A physical change is a change that affects one or more physical properties
of a substance.
20. If you make a physical change to a substance, the identity of the
substance changes. True or False? (Circle one.)
easy
Chemical Changes Form New Substances
22. A chemical
property
to
(p. 17)
describes a substance’s
change
ability to change. A chemical
occurs when a substance turns into another substance.
23. How do you know that baking a cake involves chemical changes?
Baking a cake involves chemical changes because the cake has completely
different properties than its original ingredients.
24. In Examples of Chemical Changes, the odor of sour milk indicates
a chemical change has taken place. True or False? (Circle one.)
25. Some chemical changes can be reversed with more chemical
changes. True or False? (Circle one.)
Review (p. 19)
Now that you’ve finished Section 2, review what you learned by
answering the Review questions in your ScienceLog.
14
HOLT SCIENCE AND TECHNOLOGY
Copyright © by Holt, Rinehart and Winston. All rights reserved.
21. Many physical changes are
undo. (easy or difficult)