University of Colorado — CHEM 1113
General Chemistry — Common Final
Exam
150+ Practice Questions with Answers &
Rationales
COURSE TOPICS COVERED
Topic Description
Components of Atoms, elements, compounds,
Matter mixtures, isotopes
Mole calculations, empirical/molecula
Stoichiometry
formulas, limiting reactants
Classes of Precipitation, acid-base, redox, net ion
Reactions equations
,Topic Description
Gas laws, ideal gas equation, kinetic
Gases
molecular theory
Enthalpy, Hess's Law, calorimetry, hea
Thermochemistry
capacity
Quantum theory, orbitals, electron
Atomic Structure
configurations
Ionic, covalent, metallic bonding; Lewi
Chemical Bonding
structures
Molecular Shapes VSEPR theory, bond angles, polarity
Bond order, bond energy, resonance,
Covalent Bonding
hybridization
Organic Functional groups, nomenclature,
Compounds hydrocarbons
,Topic Description
Intermolecular Hydrogen bonding, dipole-dipole,
Forces London dispersion
Equilibrium constants, Le Châtelier's
Equilibrium
principle
PART I: ATOMIC STRUCTURE & PERIODIC TRENDS
(Questions 1-25)
1. How many protons, neutrons, and electrons are
in an atom of ⁶⁵Cu?
• A) 29 protons, 36 neutrons, 29 electrons
• B) 29 protons, 65 neutrons, 29 electrons
• C) 36 protons, 29 neutrons, 36 electrons
• D) 65 protons, 29 neutrons, 65 electrons
• E) 29 protons, 36 neutrons, 36 electrons
, Answer: A
Rationale: Copper (Cu) has atomic number 29 → 29
protons. Mass number 65 → neutrons = 65 − 29 =
36. In a neutral atom, electrons = protons = 29.
2. How many protons, neutrons, and electrons are
in ⁷⁹Se²⁻?
• A) 34 protons, 45 neutrons, 36 electrons
• B) 34 protons, 45 neutrons, 34 electrons
• C) 34 protons, 79 neutrons, 36 electrons
• D) 45 protons, 34 neutrons, 36 electrons
• E) 34 protons, 45 neutrons, 32 electrons
Answer: A
Rationale: Selenium (Se) has atomic number 34 →
34 protons. Mass number 79 → neutrons = 79 − 34
= 45. Se²⁻ has gained 2 electrons → 34 + 2 = 36
electrons.
General Chemistry — Common Final
Exam
150+ Practice Questions with Answers &
Rationales
COURSE TOPICS COVERED
Topic Description
Components of Atoms, elements, compounds,
Matter mixtures, isotopes
Mole calculations, empirical/molecula
Stoichiometry
formulas, limiting reactants
Classes of Precipitation, acid-base, redox, net ion
Reactions equations
,Topic Description
Gas laws, ideal gas equation, kinetic
Gases
molecular theory
Enthalpy, Hess's Law, calorimetry, hea
Thermochemistry
capacity
Quantum theory, orbitals, electron
Atomic Structure
configurations
Ionic, covalent, metallic bonding; Lewi
Chemical Bonding
structures
Molecular Shapes VSEPR theory, bond angles, polarity
Bond order, bond energy, resonance,
Covalent Bonding
hybridization
Organic Functional groups, nomenclature,
Compounds hydrocarbons
,Topic Description
Intermolecular Hydrogen bonding, dipole-dipole,
Forces London dispersion
Equilibrium constants, Le Châtelier's
Equilibrium
principle
PART I: ATOMIC STRUCTURE & PERIODIC TRENDS
(Questions 1-25)
1. How many protons, neutrons, and electrons are
in an atom of ⁶⁵Cu?
• A) 29 protons, 36 neutrons, 29 electrons
• B) 29 protons, 65 neutrons, 29 electrons
• C) 36 protons, 29 neutrons, 36 electrons
• D) 65 protons, 29 neutrons, 65 electrons
• E) 29 protons, 36 neutrons, 36 electrons
, Answer: A
Rationale: Copper (Cu) has atomic number 29 → 29
protons. Mass number 65 → neutrons = 65 − 29 =
36. In a neutral atom, electrons = protons = 29.
2. How many protons, neutrons, and electrons are
in ⁷⁹Se²⁻?
• A) 34 protons, 45 neutrons, 36 electrons
• B) 34 protons, 45 neutrons, 34 electrons
• C) 34 protons, 79 neutrons, 36 electrons
• D) 45 protons, 34 neutrons, 36 electrons
• E) 34 protons, 45 neutrons, 32 electrons
Answer: A
Rationale: Selenium (Se) has atomic number 34 →
34 protons. Mass number 79 → neutrons = 79 − 34
= 45. Se²⁻ has gained 2 electrons → 34 + 2 = 36
electrons.
