,Chapter 01: Introduction
s s
1. A tentative explanation for a set of observations that can be tested by further
s s s s s s s s s s s s s
sexperimentation is referred to as s s s s
A) a hypothesis. B) a law. C) a theory. D) none of the above.
s s s s s s s s s
sAns: A Category: Easy Section: 1.2
s s s
2. A concise verbal or mathematical statement of a relationship between phenomena that is
s s s s s s s s s s s s
salways the same under the same conditions is referred to as
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A) a hypothesis. B) a law. C) a theory. D) none of the above.
s s s s s s s s s
sAns: B Category: Easy Section: 1.2
s s s
3. A unifying principle that explains a body of facts and relations is referred to as
s s s s s s s s s s s s s s
A) a hypothesis. B) a law. C) a theory. D) none of the above.
s s s s s s s s s
sAns: C Category: Easy Section: 1.2
s s s
4. Complete the following sentence. A hypothesis is
s s s s s s
A) a tentative explanation for a set of observations that can be tested by further
s s s s s s s s s s s s s
experimentation.
s
B) a statement describing a relationship between phenomena that is always the same
s s s s s s s s s s s
under the same conditions.
s s s s
C) a unifying principle that explains a body of facts and relations.
s s s s s s s s s s
D) a model used to visualize the invisible.
s s s s s s
sAns: A Category: Easy Section: 1.2
s s s
5. Complete the following sentence. A scientific law is
s s s s s s s
A) a tentative explanation for a set of observations that can be tested by further
s s s s s s s s s s s s s
experimentation.
s
B) a statement describing a relationship between phenomena that is always the same
s s s s s s s s s s s
under the same conditions.
s s s s
C) a unifying principle that explains a body of facts and relations.
s s s s s s s s s s
D) a model used to visualize the invisible.
s s s s s s
sAns: B Category: Easy Section: 1.2
s s s
6. Complete the following sentence. A theory is
s s s s s s
A) a tentative explanation for a set of observations that can be tested by further
s s s s s s s s s s s s s
experimentation.
s
B) a statement describing a relationship between phenomena that is always the same
s s s s s s s s s s s
under the same conditions.
s s s s
C) a unifying principle that explains a body of facts and relations.
s s s s s s s s s s
D) a model used to visualize the invisible.
s s s s s s
sAns: C Category: Easy Section: 1.2
s s s
Page 1 s
, Chapter 01: Introduction s s
7. Choose the response that includes all the items listed below that are pure substances.
s s s s s s s s s s s s s
i. orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup
s s s s s s s s
A) i, iii, v B) ii, iv C) i, iii, iv D) iv only E) all of them are pure
s s s s s s s s s s s s s s s
Ans: B Category: Easy Section: 1.2
s s s s
8. Which of the following is an example of a physical property?
s s s s s s s s s s
A) corrosiveness of sulfuric acid s s s
B) toxicity of cyanide s s
C) flammability of gasoline s s
D) neutralization of stomach acid with an antacid s s s s s s
E) lead becomes a liquid when heated to 601 C
s s s s s s s
Ans: E Category: Easy Section: 1.4
s s s s
9. Which one of the following is an example of a physical property?
s s s s s s s s s s s
A) dynamite explodes D) ice floats on top of liquid water
s s s s s s s
B) meat rots if it is not refrigerated E) s a silver platter tarnishes
s s s s s s s s
C) gasoline burns s
Ans: D Category: Easy Section: 1.4
s s s
10. Which one of the following represents a physical change?
s s s s s s s s
A) water, when heated to 100 C, forms steam s s s s s s
B) bleach turns hair yellow s s s
C) sugar, when heated, becomes brown s s s s
D) milk turns sour s s
E) apples, when exposed to air, turn brown s s s s s s
Ans: A Category: Easy Section: 1.4
s s s s
11. All of the following are properties of sodium. Which one is a physical property of
s s s s s s s s s s s s s s
sodium?
s
A) It is a surface turns black when first exposed to air.
s s s s s s s s s s
B) It is a solid at 25 C and changes to a liquid when heated to 98 C.
s s s s s s s s s s s s s s
C) When placed in water it sizzles and a gas is formed.
s s s s s s s s s s
D) When placed in contact with chlorine it forms a compound that melts at 801 C.
s s s s s s s s s s s s s
E) Sodium is never found as the pure metal in nature. s s s s s s s s s
Ans: B Category: Easy Section: 1.4
s s s s
12. All of the following are properties of tin. Which one is a chemical property of tin?
s s s s s s s s s s s s s s s
A) Tin can be hammered into a thin sheet.
s s s s s s s
B) At –40 C a sheet of tin crumbles to a gray powder.
s s s s s s s s s s
C) Tin melts at 231.9 C. s s s
D) When a bar of tin is bent, it emits an audible “cry”.
s s s s s s s s s s s
E) Tin erodes when added to hydrochloric acid, and a clear gas forms.
s s s s s s s s s s s
Ans: E Category: Medium Section: 1.4
s s s s
Page 2 s
, Chapter 01: Introduction s s
13. Which one of the following represents a chemical change?
s s s s s s s s
A) boiling water to form steam s s s s
B) burning a piece of coal s s s s
C) heating lead until it melts s s s s
D) mixing iron filings and sand at room temperature
s s s s s s s
E) breaking glass s
Ans: B Category: Medium Section: 1.4
s s s
14. Which of the following does not represent a chemical change?
s s s s s s s s s
A) a freshly cut apple turns brown
s s s s s
B) milk turns sour on standing at room temperature
s s s s s s s
C) when cooled to 0 C, liquid water becomes ice
s s s s s s s
D) frying an egg s s
E) fermentation of sugar to alcohol s s s s
Ans: C Category: Easy Section: 1.4
s s s s
15. The SI prefixes nano and deci represent, respectively:
s s s s s s s
A) 10–9 and 10–6. s s D) 109 and 10–6.
s s s s s
B) 106 and 10–3. s E) s 10–9 and 10–1. s s s s s
3 –3
C) 10 and 10 . s s s
Ans: E Category: Easy Section: 1.7
s s
16. The SI prefixes milli and mega represent, respectively:
s s s s s s s
A) 106 and 10–6. s D) 10–3 and 109.
s s s s s
B) 10–3 and 106. s s E) 10–6 and 10–3.
s s s s s
3 –6
C) 10 and 10 . s s s
Ans: B Category: Easy Section: 1.7
s s
17. The SI prefixes kilo and centi represent, respectively:
s s s s s s s
A) 103 and 10–2. s D) 10–6 and 102.
s s s s s
–1
6
B) 10 and 10 . s E) s 102 and 10–3. s s s s
C) 10–3 and 10–2. s s s s
Ans: A Category: Easy Section: 1.7
s
18. A nanometer corresponds to:
s s s
A) 10–2 meters. s s D) 10–9 meters.
s s
B) 10–3 meters. s s E) 10–12 meters.
s s
–6
C) 10 meters. s s
Ans: D Category: Easy Section: 1.7
s s s
19. A microliter corresponds to:
s s s
A) 10– 2 liters. B) 10– 3 liters. C) 10– 6 liters. D) 10– 9 liters. E) 10–12 liters.
s s s s s s s s s s s s s s
Ans: C Category: Easy Section: 1.7
s s s s
Page 3 s
s s
1. A tentative explanation for a set of observations that can be tested by further
s s s s s s s s s s s s s
sexperimentation is referred to as s s s s
A) a hypothesis. B) a law. C) a theory. D) none of the above.
s s s s s s s s s
sAns: A Category: Easy Section: 1.2
s s s
2. A concise verbal or mathematical statement of a relationship between phenomena that is
s s s s s s s s s s s s
salways the same under the same conditions is referred to as
s s s s s s s s s s
A) a hypothesis. B) a law. C) a theory. D) none of the above.
s s s s s s s s s
sAns: B Category: Easy Section: 1.2
s s s
3. A unifying principle that explains a body of facts and relations is referred to as
s s s s s s s s s s s s s s
A) a hypothesis. B) a law. C) a theory. D) none of the above.
s s s s s s s s s
sAns: C Category: Easy Section: 1.2
s s s
4. Complete the following sentence. A hypothesis is
s s s s s s
A) a tentative explanation for a set of observations that can be tested by further
s s s s s s s s s s s s s
experimentation.
s
B) a statement describing a relationship between phenomena that is always the same
s s s s s s s s s s s
under the same conditions.
s s s s
C) a unifying principle that explains a body of facts and relations.
s s s s s s s s s s
D) a model used to visualize the invisible.
s s s s s s
sAns: A Category: Easy Section: 1.2
s s s
5. Complete the following sentence. A scientific law is
s s s s s s s
A) a tentative explanation for a set of observations that can be tested by further
s s s s s s s s s s s s s
experimentation.
s
B) a statement describing a relationship between phenomena that is always the same
s s s s s s s s s s s
under the same conditions.
s s s s
C) a unifying principle that explains a body of facts and relations.
s s s s s s s s s s
D) a model used to visualize the invisible.
s s s s s s
sAns: B Category: Easy Section: 1.2
s s s
6. Complete the following sentence. A theory is
s s s s s s
A) a tentative explanation for a set of observations that can be tested by further
s s s s s s s s s s s s s
experimentation.
s
B) a statement describing a relationship between phenomena that is always the same
s s s s s s s s s s s
under the same conditions.
s s s s
C) a unifying principle that explains a body of facts and relations.
s s s s s s s s s s
D) a model used to visualize the invisible.
s s s s s s
sAns: C Category: Easy Section: 1.2
s s s
Page 1 s
, Chapter 01: Introduction s s
7. Choose the response that includes all the items listed below that are pure substances.
s s s s s s s s s s s s s
i. orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup
s s s s s s s s
A) i, iii, v B) ii, iv C) i, iii, iv D) iv only E) all of them are pure
s s s s s s s s s s s s s s s
Ans: B Category: Easy Section: 1.2
s s s s
8. Which of the following is an example of a physical property?
s s s s s s s s s s
A) corrosiveness of sulfuric acid s s s
B) toxicity of cyanide s s
C) flammability of gasoline s s
D) neutralization of stomach acid with an antacid s s s s s s
E) lead becomes a liquid when heated to 601 C
s s s s s s s
Ans: E Category: Easy Section: 1.4
s s s s
9. Which one of the following is an example of a physical property?
s s s s s s s s s s s
A) dynamite explodes D) ice floats on top of liquid water
s s s s s s s
B) meat rots if it is not refrigerated E) s a silver platter tarnishes
s s s s s s s s
C) gasoline burns s
Ans: D Category: Easy Section: 1.4
s s s
10. Which one of the following represents a physical change?
s s s s s s s s
A) water, when heated to 100 C, forms steam s s s s s s
B) bleach turns hair yellow s s s
C) sugar, when heated, becomes brown s s s s
D) milk turns sour s s
E) apples, when exposed to air, turn brown s s s s s s
Ans: A Category: Easy Section: 1.4
s s s s
11. All of the following are properties of sodium. Which one is a physical property of
s s s s s s s s s s s s s s
sodium?
s
A) It is a surface turns black when first exposed to air.
s s s s s s s s s s
B) It is a solid at 25 C and changes to a liquid when heated to 98 C.
s s s s s s s s s s s s s s
C) When placed in water it sizzles and a gas is formed.
s s s s s s s s s s
D) When placed in contact with chlorine it forms a compound that melts at 801 C.
s s s s s s s s s s s s s
E) Sodium is never found as the pure metal in nature. s s s s s s s s s
Ans: B Category: Easy Section: 1.4
s s s s
12. All of the following are properties of tin. Which one is a chemical property of tin?
s s s s s s s s s s s s s s s
A) Tin can be hammered into a thin sheet.
s s s s s s s
B) At –40 C a sheet of tin crumbles to a gray powder.
s s s s s s s s s s
C) Tin melts at 231.9 C. s s s
D) When a bar of tin is bent, it emits an audible “cry”.
s s s s s s s s s s s
E) Tin erodes when added to hydrochloric acid, and a clear gas forms.
s s s s s s s s s s s
Ans: E Category: Medium Section: 1.4
s s s s
Page 2 s
, Chapter 01: Introduction s s
13. Which one of the following represents a chemical change?
s s s s s s s s
A) boiling water to form steam s s s s
B) burning a piece of coal s s s s
C) heating lead until it melts s s s s
D) mixing iron filings and sand at room temperature
s s s s s s s
E) breaking glass s
Ans: B Category: Medium Section: 1.4
s s s
14. Which of the following does not represent a chemical change?
s s s s s s s s s
A) a freshly cut apple turns brown
s s s s s
B) milk turns sour on standing at room temperature
s s s s s s s
C) when cooled to 0 C, liquid water becomes ice
s s s s s s s
D) frying an egg s s
E) fermentation of sugar to alcohol s s s s
Ans: C Category: Easy Section: 1.4
s s s s
15. The SI prefixes nano and deci represent, respectively:
s s s s s s s
A) 10–9 and 10–6. s s D) 109 and 10–6.
s s s s s
B) 106 and 10–3. s E) s 10–9 and 10–1. s s s s s
3 –3
C) 10 and 10 . s s s
Ans: E Category: Easy Section: 1.7
s s
16. The SI prefixes milli and mega represent, respectively:
s s s s s s s
A) 106 and 10–6. s D) 10–3 and 109.
s s s s s
B) 10–3 and 106. s s E) 10–6 and 10–3.
s s s s s
3 –6
C) 10 and 10 . s s s
Ans: B Category: Easy Section: 1.7
s s
17. The SI prefixes kilo and centi represent, respectively:
s s s s s s s
A) 103 and 10–2. s D) 10–6 and 102.
s s s s s
–1
6
B) 10 and 10 . s E) s 102 and 10–3. s s s s
C) 10–3 and 10–2. s s s s
Ans: A Category: Easy Section: 1.7
s
18. A nanometer corresponds to:
s s s
A) 10–2 meters. s s D) 10–9 meters.
s s
B) 10–3 meters. s s E) 10–12 meters.
s s
–6
C) 10 meters. s s
Ans: D Category: Easy Section: 1.7
s s s
19. A microliter corresponds to:
s s s
A) 10– 2 liters. B) 10– 3 liters. C) 10– 6 liters. D) 10– 9 liters. E) 10–12 liters.
s s s s s s s s s s s s s s
Ans: C Category: Easy Section: 1.7
s s s s
Page 3 s
