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CHEMISTRY: THE CENTRAL SCIENCE (15TH EDITION) EXAM QUESTIONS 2026 EXAM
LATEST VERSION SOLVED QUESTIONS & ANSWERS VERIFIED 100 %
Chemistry: The Central Science (15th Edition) — Questions
CHAPTER 1: INTRODUCTION: MATTER, ENERGY, AND MEASUREMENT (Q1–Q15)
1. Which of the following is the physical state in which matter has a specific
volume but does not have a specific shape?
A) Gas
B) Solid
C) Liquid
D) Plasma
Correct Answer: C
Rationale: A liquid has a definite volume but takes the shape of its container. A solid
has both definite shape and volume, while a gas has neither definite shape nor volume .
2. The law of constant composition applies to which of the following?
A) Homogeneous mixtures
B) Heterogeneous mixtures
C) Compounds
D) Elements
Correct Answer: C
Rationale: The law of constant composition (also known as the law of definite
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proportions) states that a given compound always contains the same elements in the
same proportion by mass .
3. Which of the following is a homogeneous mixture?
A) Sand and water
B) Salt dissolved in water
C) Oil and vinegar
D) Granite rock
Correct Answer: B
Rationale: A homogeneous mixture (solution) has uniform composition throughout.
Salt dissolved in water is a homogeneous mixture because the salt is evenly distributed
at the molecular level.
4. What is the SI base unit for amount of substance?
A) Gram
B) Mole
C) Kelvin
D) Liter
Correct Answer: B
Rationale: The mole (mol) is the SI base unit for amount of substance. It is defined as
the amount of substance containing the same number of entities as there are atoms in
exactly 12 g of carbon-12.
5. How many significant figures are in the measurement 0.0045060 g?
A) 3
B) 4
C) 5
D) 7
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Correct Answer: C
Rationale: Significant figures include all non-zero digits, zeros between non-zero digits,
and trailing zeros after a decimal point. In 0.0045060, the significant figures are 4, 5, 0,
6, and 0 = 5 significant figures. Leading zeros are not significant.
6. What is the physical state in which matter has neither a specific volume nor a
specific shape?
A) Solid
B) Liquid
C) Gas
D) Plasma
Correct Answer: C
Rationale: A gas has neither a definite shape nor a definite volume. It expands to fill its
container completely.
7. Which of the following is a chemical property?
A) Melting point
B) Density
C) Flammability
D) Boiling point
Correct Answer: C
Rationale: Chemical properties describe how a substance reacts to form new
substances. Flammability is a chemical property because it describes the ability of a
substance to burn.
8. Which of the following is an intensive property?
A) Mass
B) Volume
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C) Density
D) Length
Correct Answer: C
Rationale: Intensive properties do not depend on the amount of substance present.
Density is an intensive property because it is the ratio of mass to volume, which remains
constant regardless of sample size.
9. Express 0.0000456 in scientific notation.
A) 4.56 × 10⁻⁵
B) 4.56 × 10⁻⁴
C) 4.56 × 10⁵
D) 4.56 × 10⁴
Correct Answer: A
Rationale: To convert 0.0000456 to scientific notation, move the decimal point to the
right until there is one non-zero digit to the left of the decimal. The decimal moves 5
places, so the exponent is -5.
10. How many milliliters are in 2.5 liters?
A) 25 mL
B) 250 mL
C) 2,500 mL
D) 25,000 mL
Correct Answer: C
Rationale: 1 liter = 1,000 milliliters. Therefore, 2.5 L × 1,000 mL/L = 2,500 mL.
11. Which of the following is a heterogeneous mixture?
CHEMISTRY: THE CENTRAL SCIENCE (15TH EDITION) EXAM QUESTIONS 2026 EXAM
LATEST VERSION SOLVED QUESTIONS & ANSWERS VERIFIED 100 %
Chemistry: The Central Science (15th Edition) — Questions
CHAPTER 1: INTRODUCTION: MATTER, ENERGY, AND MEASUREMENT (Q1–Q15)
1. Which of the following is the physical state in which matter has a specific
volume but does not have a specific shape?
A) Gas
B) Solid
C) Liquid
D) Plasma
Correct Answer: C
Rationale: A liquid has a definite volume but takes the shape of its container. A solid
has both definite shape and volume, while a gas has neither definite shape nor volume .
2. The law of constant composition applies to which of the following?
A) Homogeneous mixtures
B) Heterogeneous mixtures
C) Compounds
D) Elements
Correct Answer: C
Rationale: The law of constant composition (also known as the law of definite
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proportions) states that a given compound always contains the same elements in the
same proportion by mass .
3. Which of the following is a homogeneous mixture?
A) Sand and water
B) Salt dissolved in water
C) Oil and vinegar
D) Granite rock
Correct Answer: B
Rationale: A homogeneous mixture (solution) has uniform composition throughout.
Salt dissolved in water is a homogeneous mixture because the salt is evenly distributed
at the molecular level.
4. What is the SI base unit for amount of substance?
A) Gram
B) Mole
C) Kelvin
D) Liter
Correct Answer: B
Rationale: The mole (mol) is the SI base unit for amount of substance. It is defined as
the amount of substance containing the same number of entities as there are atoms in
exactly 12 g of carbon-12.
5. How many significant figures are in the measurement 0.0045060 g?
A) 3
B) 4
C) 5
D) 7
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Correct Answer: C
Rationale: Significant figures include all non-zero digits, zeros between non-zero digits,
and trailing zeros after a decimal point. In 0.0045060, the significant figures are 4, 5, 0,
6, and 0 = 5 significant figures. Leading zeros are not significant.
6. What is the physical state in which matter has neither a specific volume nor a
specific shape?
A) Solid
B) Liquid
C) Gas
D) Plasma
Correct Answer: C
Rationale: A gas has neither a definite shape nor a definite volume. It expands to fill its
container completely.
7. Which of the following is a chemical property?
A) Melting point
B) Density
C) Flammability
D) Boiling point
Correct Answer: C
Rationale: Chemical properties describe how a substance reacts to form new
substances. Flammability is a chemical property because it describes the ability of a
substance to burn.
8. Which of the following is an intensive property?
A) Mass
B) Volume
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C) Density
D) Length
Correct Answer: C
Rationale: Intensive properties do not depend on the amount of substance present.
Density is an intensive property because it is the ratio of mass to volume, which remains
constant regardless of sample size.
9. Express 0.0000456 in scientific notation.
A) 4.56 × 10⁻⁵
B) 4.56 × 10⁻⁴
C) 4.56 × 10⁵
D) 4.56 × 10⁴
Correct Answer: A
Rationale: To convert 0.0000456 to scientific notation, move the decimal point to the
right until there is one non-zero digit to the left of the decimal. The decimal moves 5
places, so the exponent is -5.
10. How many milliliters are in 2.5 liters?
A) 25 mL
B) 250 mL
C) 2,500 mL
D) 25,000 mL
Correct Answer: C
Rationale: 1 liter = 1,000 milliliters. Therefore, 2.5 L × 1,000 mL/L = 2,500 mL.
11. Which of the following is a heterogeneous mixture?
