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