Ch01
Student: ___________________________________________________________________________
1. Complete the following sentence. A scientific law is:
A. a tentative explanation for a set of observations that can be tested by further experimentation.
B. a statement describing a relationship between phenomena that is always the same under the same
conditions.
C. a unifying principle that explains a body of facts and relations.
D. a model used to visualize the invisible.
2. Choose the response that includes all the items listed below that are pure substances.
i. orange juice ii. steam iii. wine iv. oxygen v. vegetable soup
A. i, iii, v
B. ii, iv
C. i, iii, iv
D. iv only
E. All of them are pure.
3. Which of these is an example of a physical property?
A. corrosiveness of sulfuric acid
B. toxicity of cyanide
C. flammability of gasoline
D. neutralization of stomach acid with an antacid
E. lead becomes a liquid when heated to 601°C
4. Which one of these is an example of a physical property?
A. dynamite explodes
B. meat rots if it is not refrigerated
C. honey tastes sweet
D. ice floats on top of liquid water
E. a silver platter tarnishes
5. Which one of these represents a physical change?
A. water, when heated, forms steam
B. bleach turns hair yellow
C. sugar, when heated, becomes brown
D. milk turns sour
E. apples, when exposed to air, turn brown
6. Which one of these represents a physical change?
A. battery cables corrode
B. bleach turns hair yellow
C. sugar, if heated enough, turns black and loses its sweetness
D. milk turns sour
E. lard, when heated, changes to liquid
7. All of these statements describe properties of sodium. Which one describes a physical property of
sodium?
A. Sodium's surface turns black when first exposed to air.
B. Sodium is a solid at 25°C and changes to a liquid when heated to 98°C.
C. When placed in water, sodium sizzles and a gas is formed.
D. When placed in contact with chlorine, sodium forms a compound that melts at 801°C.
E. Sodium is never found as the pure metal in nature.
,8. All of these statements describe properties of tin. Which one describes a chemical property of tin?
A. Tin can be hammered into a thin sheet.
B. At -40°C a sheet of tin crumbles to a gray powder.
C. Tin melts at 231.9°C.
D. When a bar of tin is bent, it emits an audible "cry".
E. Tin dissolves slowly in cold, dilute hydrochloric acid, but it dissolves readily in concentrated
hydrochloric acid.
9. Which one of these represents a chemical change?
A. boiling water to form steam
B. turning hair yellow with bleach
C. melting butter
D. mixing powdered charcoal and oxygen at room temperature
E. cutting a bar of sodium metal into pieces with a knife
10. Which one of these represents a chemical change?
A. lard when heated changes to liquid
B. water disappears from a beaker in a few days at room temperature
C. sugar dissolving in water
D. milk turns sour in a few days at room temperature
E. water boils below 100°C on a mountain
11. Which one of these represents a chemical change?
A. heating water to form steam
B. sliced apples, in contact with air, turning brown
C. sugar dissolving in hot coffee
D. mixing sugar and cinnamon
E. cutting a bar of sodium metal into pieces with a knife
12. Which of these does not represent a chemical change?
A. a freshly cut apple turns brown
B. milk turns sour on standing at room temperature
C. when cooled, liquid water becomes ice
D. bread rises when baking
E. fermentation of sugar to alcohol
13. Condensation refers to which conversion?
A. solid → gas
B. solid → liquid
C. gas → liquid
D. gas → solid
E. liquid → gas
14. The SI prefixes giga and micro represent, respectively:
A. 10-9 and 10-6.
B. 106 and 10-3.
C. 103 and 10-3.
D. 109 and 10-6.
E. 10-9 and 10-3.
15. The SI prefixes milli and mega represent, respectively:
A. 106 and 10-6.
B. 10-3 and 106.
C. 103 and 10-6.
D. 10-3 and 109.
E. 10-6 and 10-3.
,16. The SI prefixes kilo and centi represent, respectively:
A. 103 and 10-2.
B. 106 and 10-1.
C. 10-3 and 10-2.
D. 10-6 and 102.
E. 102 and 10-3.
17. The diameter of an atom is approximately 1 × 10-8 cm. What is this diameter when expressed in
nanometers?
A. 1 × 10-19 nm
B. 1 × 10-15 nm
C. 1 × 101 nm
D. 1 × 10-10 nm
E. 1 × 10-1 nm
18. 6.0 km is how many micrometers?
A. 6.0 × 106 µm
B. 1.7 × 10-7 µm
C. 6.0 × 109 µm
D. 1.7 × 10-4 µm
E. 6.0 × 103 µm
19. 2.4 km is how many millimeters?
A. 2,400 mm
B. 2.4 × 104 mm
C. 2.4 × 105 mm
D. 2.4 × 106 mm
E. 2.4 × 10-5 mm
20. How many milliliters is 0.005 L?
A. 0.5 mL
B. 5 mL
C. 0.50 mL
D. 0.000005 mL
E. 200 mL
21. Express 7,500 nm as picometers.
A. 7.50 pm
B. 75.0 pm
C. 750 pm
D. 7.5 × 106 pm
E. 7.5 × 1012 pm
22. Which of these quantities represents the largest mass?
A. 2.0 × 102 mg
B. 0.0010 kg
C. 1.0 × 105 μg
D. 2.0 × 102 cg
E. 10.0 dg
23. Lead melts at 601.0°C. What temperature is this in °F?
A. 302°F
B. 365°F
C. 1,050°F
D. 1,082°F
E. 1,114°F
, 24. Ammonia boils at -33.4°C. What temperature is this in °F?
A. -60.1°F
B. -92.1°F
C. -28.1°F
D. -18.5°F
E. +13.5°F
25. Many home freezers maintain a temperature of 0°F. Express this temperature in °C.
A. -32°C
B. -18°C
C. 0°C
D. 18°C
E. 57.6°C
26. The highest temperature ever recorded in Phoenix, Arizona, was 122°F. Express this temperature
in °C.
A. 50.0°C
B. 64.4°C
C. 67.8°C
D. 162.0°C
E. 219.6°C
27. Dry ice (carbon dioxide) changes from a solid to a gas at -78.5°C. What is this temperature in °F?
A. -173°F
B. -12.6°F
C. -109°F
D. -75.6°F
E. None of them are within 2°F of the right answer.
28. The number 1.050 × 109 has how many significant figures?
A. 2
B. 3
C. 4
D. 9
E. 13
29. How many significant figures are there in 1.3070 g?
A. 6
B. 5
C. 4
D. 3
E. 2
30. After carrying out the operations below, how many significant figures are appropriate to show in the
result?
(13.7 + 0.027) ÷ 8.221
A. 1
B. 2
C. 3
D. 4
E. 5
31. How many significant figures does the product 8.52010 × 7.9 contain?
A. 2
B. 3
C. 4
D. 5
E. 6
Student: ___________________________________________________________________________
1. Complete the following sentence. A scientific law is:
A. a tentative explanation for a set of observations that can be tested by further experimentation.
B. a statement describing a relationship between phenomena that is always the same under the same
conditions.
C. a unifying principle that explains a body of facts and relations.
D. a model used to visualize the invisible.
2. Choose the response that includes all the items listed below that are pure substances.
i. orange juice ii. steam iii. wine iv. oxygen v. vegetable soup
A. i, iii, v
B. ii, iv
C. i, iii, iv
D. iv only
E. All of them are pure.
3. Which of these is an example of a physical property?
A. corrosiveness of sulfuric acid
B. toxicity of cyanide
C. flammability of gasoline
D. neutralization of stomach acid with an antacid
E. lead becomes a liquid when heated to 601°C
4. Which one of these is an example of a physical property?
A. dynamite explodes
B. meat rots if it is not refrigerated
C. honey tastes sweet
D. ice floats on top of liquid water
E. a silver platter tarnishes
5. Which one of these represents a physical change?
A. water, when heated, forms steam
B. bleach turns hair yellow
C. sugar, when heated, becomes brown
D. milk turns sour
E. apples, when exposed to air, turn brown
6. Which one of these represents a physical change?
A. battery cables corrode
B. bleach turns hair yellow
C. sugar, if heated enough, turns black and loses its sweetness
D. milk turns sour
E. lard, when heated, changes to liquid
7. All of these statements describe properties of sodium. Which one describes a physical property of
sodium?
A. Sodium's surface turns black when first exposed to air.
B. Sodium is a solid at 25°C and changes to a liquid when heated to 98°C.
C. When placed in water, sodium sizzles and a gas is formed.
D. When placed in contact with chlorine, sodium forms a compound that melts at 801°C.
E. Sodium is never found as the pure metal in nature.
,8. All of these statements describe properties of tin. Which one describes a chemical property of tin?
A. Tin can be hammered into a thin sheet.
B. At -40°C a sheet of tin crumbles to a gray powder.
C. Tin melts at 231.9°C.
D. When a bar of tin is bent, it emits an audible "cry".
E. Tin dissolves slowly in cold, dilute hydrochloric acid, but it dissolves readily in concentrated
hydrochloric acid.
9. Which one of these represents a chemical change?
A. boiling water to form steam
B. turning hair yellow with bleach
C. melting butter
D. mixing powdered charcoal and oxygen at room temperature
E. cutting a bar of sodium metal into pieces with a knife
10. Which one of these represents a chemical change?
A. lard when heated changes to liquid
B. water disappears from a beaker in a few days at room temperature
C. sugar dissolving in water
D. milk turns sour in a few days at room temperature
E. water boils below 100°C on a mountain
11. Which one of these represents a chemical change?
A. heating water to form steam
B. sliced apples, in contact with air, turning brown
C. sugar dissolving in hot coffee
D. mixing sugar and cinnamon
E. cutting a bar of sodium metal into pieces with a knife
12. Which of these does not represent a chemical change?
A. a freshly cut apple turns brown
B. milk turns sour on standing at room temperature
C. when cooled, liquid water becomes ice
D. bread rises when baking
E. fermentation of sugar to alcohol
13. Condensation refers to which conversion?
A. solid → gas
B. solid → liquid
C. gas → liquid
D. gas → solid
E. liquid → gas
14. The SI prefixes giga and micro represent, respectively:
A. 10-9 and 10-6.
B. 106 and 10-3.
C. 103 and 10-3.
D. 109 and 10-6.
E. 10-9 and 10-3.
15. The SI prefixes milli and mega represent, respectively:
A. 106 and 10-6.
B. 10-3 and 106.
C. 103 and 10-6.
D. 10-3 and 109.
E. 10-6 and 10-3.
,16. The SI prefixes kilo and centi represent, respectively:
A. 103 and 10-2.
B. 106 and 10-1.
C. 10-3 and 10-2.
D. 10-6 and 102.
E. 102 and 10-3.
17. The diameter of an atom is approximately 1 × 10-8 cm. What is this diameter when expressed in
nanometers?
A. 1 × 10-19 nm
B. 1 × 10-15 nm
C. 1 × 101 nm
D. 1 × 10-10 nm
E. 1 × 10-1 nm
18. 6.0 km is how many micrometers?
A. 6.0 × 106 µm
B. 1.7 × 10-7 µm
C. 6.0 × 109 µm
D. 1.7 × 10-4 µm
E. 6.0 × 103 µm
19. 2.4 km is how many millimeters?
A. 2,400 mm
B. 2.4 × 104 mm
C. 2.4 × 105 mm
D. 2.4 × 106 mm
E. 2.4 × 10-5 mm
20. How many milliliters is 0.005 L?
A. 0.5 mL
B. 5 mL
C. 0.50 mL
D. 0.000005 mL
E. 200 mL
21. Express 7,500 nm as picometers.
A. 7.50 pm
B. 75.0 pm
C. 750 pm
D. 7.5 × 106 pm
E. 7.5 × 1012 pm
22. Which of these quantities represents the largest mass?
A. 2.0 × 102 mg
B. 0.0010 kg
C. 1.0 × 105 μg
D. 2.0 × 102 cg
E. 10.0 dg
23. Lead melts at 601.0°C. What temperature is this in °F?
A. 302°F
B. 365°F
C. 1,050°F
D. 1,082°F
E. 1,114°F
, 24. Ammonia boils at -33.4°C. What temperature is this in °F?
A. -60.1°F
B. -92.1°F
C. -28.1°F
D. -18.5°F
E. +13.5°F
25. Many home freezers maintain a temperature of 0°F. Express this temperature in °C.
A. -32°C
B. -18°C
C. 0°C
D. 18°C
E. 57.6°C
26. The highest temperature ever recorded in Phoenix, Arizona, was 122°F. Express this temperature
in °C.
A. 50.0°C
B. 64.4°C
C. 67.8°C
D. 162.0°C
E. 219.6°C
27. Dry ice (carbon dioxide) changes from a solid to a gas at -78.5°C. What is this temperature in °F?
A. -173°F
B. -12.6°F
C. -109°F
D. -75.6°F
E. None of them are within 2°F of the right answer.
28. The number 1.050 × 109 has how many significant figures?
A. 2
B. 3
C. 4
D. 9
E. 13
29. How many significant figures are there in 1.3070 g?
A. 6
B. 5
C. 4
D. 3
E. 2
30. After carrying out the operations below, how many significant figures are appropriate to show in the
result?
(13.7 + 0.027) ÷ 8.221
A. 1
B. 2
C. 3
D. 4
E. 5
31. How many significant figures does the product 8.52010 × 7.9 contain?
A. 2
B. 3
C. 4
D. 5
E. 6
