CHM 101 EXAM 1 DONOVAN – QUESTIONS AND ANSWERS | VERIFIED AND
WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD AND PASS |
LATEST EXAM UPDATE 2026/2027
Core Domains:
• Atomic Structure and Periodic Trends
• Chemical Bonding and Molecular Geometry
• Stoichiometry and Chemical Reactions
• States of Matter and Intermolecular Forces
• Thermochemistry and Thermodynamics
• Kinetics and Reaction Rates
• Chemical Equilibrium and Le Chatelier's Principle
• Acid-Base Chemistry and pH
• Oxidation-Reduction (Redox) Reactions
• Laboratory Safety and Data Analysis
Introduction
This comprehensive examination is designed to assess your foundational knowledge
and applied skills in general chemistry. It covers a broad spectrum of topics, from
atomic theory and bonding to reaction dynamics and equilibrium, emphasizing
real-world application and critical decision-making. The assessment utilizes a
multiple-choice format, incorporating theoretical questions and scenario-based
problems that require the integration of core concepts. Successful completion
demonstrates proficiency in chemical reasoning, quantitative problem-solving, and
the ability to apply professional and ethical standards in a laboratory context,
ensuring readiness for advanced study and professional practice.
,SECTION ONE: QUESTIONS 1 – 50
1. Question text
Which scientist is credited with the discovery of the electron and proposing the
"plum pudding" model of the atom?
A. Ernest Rutherford
B. Niels Bohr
C. J.J. Thomson
D. John Dalton
🟢 Correct Answer: C. J.J. Thomson
🔴 Explanation: J.J. Thomson discovered the electron through his cathode ray
tube experiments and proposed the plum pudding model, where negatively
charged electrons were embedded in a positively charged "soup." Rutherford is
known for the gold foil experiment and the nuclear model, Bohr for quantized
orbits, and Dalton for the billiard ball model.
2. Question text
An atom of an element contains 15 protons, 16 neutrons, and 15 electrons. What
is the mass number of this atom?
A. 15
B. 30
C. 31
D. 46
🟢 Correct Answer: C. 31
,🔴 Explanation: The mass number is the sum of protons and neutrons in an atom.
For this element, 15 protons + 16 neutrons = 31. Option A is the atomic number.
Option B and D are incorrect sums.
3. Question text
Which of the following elements is a halogen?
A. Oxygen (O)
B. Chlorine (Cl)
C. Sodium (Na)
D. Argon (Ar)
🟢 Correct Answer: B. Chlorine (Cl)
🔴 Explanation: Halogens are found in Group 17 of the periodic table and are
highly reactive nonmetals. Chlorine is a halogen. Oxygen is a chalcogen, sodium is
an alkali metal, and argon is a noble gas.
4. Question text
What type of bond is formed when electrons are shared between two atoms of
similar electronegativity?
A. Ionic bond
B. Nonpolar covalent bond
C. Polar covalent bond
D. Metallic bond
🟢 Correct Answer: B. Nonpolar covalent bond
, 🔴 Explanation: A nonpolar covalent bond is formed when two atoms have
similar electronegativities and share electrons equally. An ionic bond involves
electron transfer, a polar bond involves unequal sharing, and a metallic bond
involves a "sea of electrons."
5. Question text
In a laboratory setting, what is the first and most important step to take before
beginning any experiment?
A. Put on safety goggles.
B. Read the entire procedure.
C. Gather all necessary equipment.
D. Wash your hands.
🟢 Correct Answer: B. Read the entire procedure.
🔴 Explanation: The first and most critical step is to read the entire procedure to
understand the experiment's objectives, identify potential hazards, and anticipate
each step. Wearing goggles is crucial but secondary to understanding the
procedure to be safe and successful.
6. Question text
Which of the following compounds is an example of an ionic compound?
A. H2O
B. CO2
C. NaCl
D. CH4
WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD AND PASS |
LATEST EXAM UPDATE 2026/2027
Core Domains:
• Atomic Structure and Periodic Trends
• Chemical Bonding and Molecular Geometry
• Stoichiometry and Chemical Reactions
• States of Matter and Intermolecular Forces
• Thermochemistry and Thermodynamics
• Kinetics and Reaction Rates
• Chemical Equilibrium and Le Chatelier's Principle
• Acid-Base Chemistry and pH
• Oxidation-Reduction (Redox) Reactions
• Laboratory Safety and Data Analysis
Introduction
This comprehensive examination is designed to assess your foundational knowledge
and applied skills in general chemistry. It covers a broad spectrum of topics, from
atomic theory and bonding to reaction dynamics and equilibrium, emphasizing
real-world application and critical decision-making. The assessment utilizes a
multiple-choice format, incorporating theoretical questions and scenario-based
problems that require the integration of core concepts. Successful completion
demonstrates proficiency in chemical reasoning, quantitative problem-solving, and
the ability to apply professional and ethical standards in a laboratory context,
ensuring readiness for advanced study and professional practice.
,SECTION ONE: QUESTIONS 1 – 50
1. Question text
Which scientist is credited with the discovery of the electron and proposing the
"plum pudding" model of the atom?
A. Ernest Rutherford
B. Niels Bohr
C. J.J. Thomson
D. John Dalton
🟢 Correct Answer: C. J.J. Thomson
🔴 Explanation: J.J. Thomson discovered the electron through his cathode ray
tube experiments and proposed the plum pudding model, where negatively
charged electrons were embedded in a positively charged "soup." Rutherford is
known for the gold foil experiment and the nuclear model, Bohr for quantized
orbits, and Dalton for the billiard ball model.
2. Question text
An atom of an element contains 15 protons, 16 neutrons, and 15 electrons. What
is the mass number of this atom?
A. 15
B. 30
C. 31
D. 46
🟢 Correct Answer: C. 31
,🔴 Explanation: The mass number is the sum of protons and neutrons in an atom.
For this element, 15 protons + 16 neutrons = 31. Option A is the atomic number.
Option B and D are incorrect sums.
3. Question text
Which of the following elements is a halogen?
A. Oxygen (O)
B. Chlorine (Cl)
C. Sodium (Na)
D. Argon (Ar)
🟢 Correct Answer: B. Chlorine (Cl)
🔴 Explanation: Halogens are found in Group 17 of the periodic table and are
highly reactive nonmetals. Chlorine is a halogen. Oxygen is a chalcogen, sodium is
an alkali metal, and argon is a noble gas.
4. Question text
What type of bond is formed when electrons are shared between two atoms of
similar electronegativity?
A. Ionic bond
B. Nonpolar covalent bond
C. Polar covalent bond
D. Metallic bond
🟢 Correct Answer: B. Nonpolar covalent bond
, 🔴 Explanation: A nonpolar covalent bond is formed when two atoms have
similar electronegativities and share electrons equally. An ionic bond involves
electron transfer, a polar bond involves unequal sharing, and a metallic bond
involves a "sea of electrons."
5. Question text
In a laboratory setting, what is the first and most important step to take before
beginning any experiment?
A. Put on safety goggles.
B. Read the entire procedure.
C. Gather all necessary equipment.
D. Wash your hands.
🟢 Correct Answer: B. Read the entire procedure.
🔴 Explanation: The first and most critical step is to read the entire procedure to
understand the experiment's objectives, identify potential hazards, and anticipate
each step. Wearing goggles is crucial but secondary to understanding the
procedure to be safe and successful.
6. Question text
Which of the following compounds is an example of an ionic compound?
A. H2O
B. CO2
C. NaCl
D. CH4
