CHEM 101 Winter 2026 Exam 1 (B)
On the answer sheet (scantron) write your last name, first name initial (FI), middle name initial (MI) (if
applicable), Drexel ID number, and lab section number. Choose the best (most correct) answer for each
question and fill in the corresponding bubbles for all 26 questions. Look at the example of a correctly
filled bubble at the top of your scantron sheet. Do NOT go past the frame of the bubbles. DO NOT
CROSS OUT bubbles. DO NOT MARK/WRITE anything else on the scantron sheet.
Note: a copy of the periodic table has been provided at the end page of this exam.
Potentially useful data:
d= m/v
m=dv
Avogadro’s constant: 6.02 × 1023 mol-1
speed of light: c = 3.00 × 108 m/s
c=νλ
Ephoton = hν
1 Hz = 1 s-1
Planck’s constant: h = 6.63 × 10-34 J∙s
Questions:
1.Please choose the letter “B” as your answer for this question.
2. Which statement is true:
A) P4 is not a molecule.
B) Water (H2O) is a compound but not a molecule.
C) A piece of pure aluminum which has millions of aluminum atoms is an element.
D)Salt (NaCl) cannot be a pure compound since it has sodium (Na) and chlorine (Cl).
E) None of them
Answer: C
3. Which of the following is the SMALLEST volume?
A) 0.065 dL
B) 2.6 cm3
C) 3.5 × 102 mL
D) 1.2 x 10 -2 L
E) 9.0 × 106 nL
Answer: B
4. How are gases different from solids and liquids?
A) Gases can only be made up of atoms.
B) The particles in a gas attract each other much more strongly than in solids and liquids.
C) Only gases can take the shape of their container.
D) Gases are compressible.
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, E) Gases are colorless.
Answer: D
5. Determine the mass of an object that has a volume of 88.6 mL and a density of 7.77 g/mL.
A) 688 g
B) 96.4 g
C) 0.0877 g
D) 11.4 g
E) 80.8 g
Answer: A
6. Two or more substances in variable proportions, where the composition is constant throughout are
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a crystalline solid.
E) a homogeneous mixture.
Answer: E
7. An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The
heavier two isotopes have an abundance of 4.68% and 3.09%, respectively. What is the mass of the
element?
A) 27.684 amu
B) 29.251 amu
C) 30.107 amu
D) 28.085 amu
E) 28.991 amu
Answer: D
8. Dalton's Atomic Theory states
A) that all elements have several isotopes.
B) that the properties of matter are determined by the properties of atoms.
C) that matter is composed of small indestructible particles.
D) that energy is neither created nor destroyed during a chemical reaction.
E) that an atom is predominantly empty space.
Answer: C
9. Which of the following is an example of the law of multiple proportions?
A) A sample of chlorine is found to contain three times as much Cl-35 as Cl-37.
B) Two different samples of table salt are found to have the same ratio of sodium to chlorine.
C) Two different compounds formed from carbon and oxygen have the following mass ratios:
1.33 g O: 1 g C and 2.66 g O: 1 g C.
D) The atomic mass of bromine is found to be 79.90 amu.
E) Nitrogen dioxide always has a mass ratio of 2.28 g O: 1 g N.
Answer: C
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On the answer sheet (scantron) write your last name, first name initial (FI), middle name initial (MI) (if
applicable), Drexel ID number, and lab section number. Choose the best (most correct) answer for each
question and fill in the corresponding bubbles for all 26 questions. Look at the example of a correctly
filled bubble at the top of your scantron sheet. Do NOT go past the frame of the bubbles. DO NOT
CROSS OUT bubbles. DO NOT MARK/WRITE anything else on the scantron sheet.
Note: a copy of the periodic table has been provided at the end page of this exam.
Potentially useful data:
d= m/v
m=dv
Avogadro’s constant: 6.02 × 1023 mol-1
speed of light: c = 3.00 × 108 m/s
c=νλ
Ephoton = hν
1 Hz = 1 s-1
Planck’s constant: h = 6.63 × 10-34 J∙s
Questions:
1.Please choose the letter “B” as your answer for this question.
2. Which statement is true:
A) P4 is not a molecule.
B) Water (H2O) is a compound but not a molecule.
C) A piece of pure aluminum which has millions of aluminum atoms is an element.
D)Salt (NaCl) cannot be a pure compound since it has sodium (Na) and chlorine (Cl).
E) None of them
Answer: C
3. Which of the following is the SMALLEST volume?
A) 0.065 dL
B) 2.6 cm3
C) 3.5 × 102 mL
D) 1.2 x 10 -2 L
E) 9.0 × 106 nL
Answer: B
4. How are gases different from solids and liquids?
A) Gases can only be made up of atoms.
B) The particles in a gas attract each other much more strongly than in solids and liquids.
C) Only gases can take the shape of their container.
D) Gases are compressible.
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, E) Gases are colorless.
Answer: D
5. Determine the mass of an object that has a volume of 88.6 mL and a density of 7.77 g/mL.
A) 688 g
B) 96.4 g
C) 0.0877 g
D) 11.4 g
E) 80.8 g
Answer: A
6. Two or more substances in variable proportions, where the composition is constant throughout are
A) a compound.
B) an element.
C) a heterogeneous mixture.
D) a crystalline solid.
E) a homogeneous mixture.
Answer: E
7. An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The
heavier two isotopes have an abundance of 4.68% and 3.09%, respectively. What is the mass of the
element?
A) 27.684 amu
B) 29.251 amu
C) 30.107 amu
D) 28.085 amu
E) 28.991 amu
Answer: D
8. Dalton's Atomic Theory states
A) that all elements have several isotopes.
B) that the properties of matter are determined by the properties of atoms.
C) that matter is composed of small indestructible particles.
D) that energy is neither created nor destroyed during a chemical reaction.
E) that an atom is predominantly empty space.
Answer: C
9. Which of the following is an example of the law of multiple proportions?
A) A sample of chlorine is found to contain three times as much Cl-35 as Cl-37.
B) Two different samples of table salt are found to have the same ratio of sodium to chlorine.
C) Two different compounds formed from carbon and oxygen have the following mass ratios:
1.33 g O: 1 g C and 2.66 g O: 1 g C.
D) The atomic mass of bromine is found to be 79.90 amu.
E) Nitrogen dioxide always has a mass ratio of 2.28 g O: 1 g N.
Answer: C
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