ACS Chem II Final Exam Review
Questions and Answers.
What is the Bronsted-Lowry definition? - Answer The Bronsted-Lowry definition states that
an acid is a substance that donates protons (H+), while a base is a substance that accepts
protons.
What is a conjugate acid-base pair? - Answer A conjugate acid-base pair consists of two
species that differ by the presence or absence of a proton. For example, HCN and CN− are a
conjugate acid-base pair.
Which chemical species can function both as an acid and as a base? - Answer The species
that can function both as an acid and a base is called amphoteric. Examples include HCO3− and
H2O.
What is the ionization constant (Ka) of an acid? - Answer The ionization constant (Ka) is a
measure of the strength of an acid in solution, representing the equilibrium constant for the
dissociation of the acid into its ions.
What is the pH of a 0.03 M HCl solution? - Answer The pH of a 0.03 M HCl solution is
approximately 1.5, since HCl is a strong acid and fully dissociates in solution.
What is the strongest acid among HClO, HClO2, HClO3, and HClO4? - Answer HClO4 is the
strongest acid among these options.
What is a buffer solution? - Answer A buffer solution is a solution that resists changes in pH
when small amounts of acid or base are added, typically consisting of a weak acid and its
conjugate base.
What is the significance of the equilibrium constant (K) in a reaction? - Answer The
equilibrium constant (K) indicates the ratio of the concentrations of products to reactants at
equilibrium, providing insight into the extent of the reaction.
What happens to the equilibrium position when the temperature is increased in an exothermic
reaction? - Answer Increasing the temperature in an exothermic reaction shifts the
equilibrium position to the left, favoring the formation of reactants.
What is the Nernst equation? - Answer The Nernst equation relates the cell potential of an
electrochemical cell to the standard electrode potential and the concentrations of the reactants
and products.
, What is hydrolysis in the context of salts? - Answer Hydrolysis is the reaction of a salt with
water, resulting in the formation of an acidic or basic solution depending on the nature of the
ions in the salt.
What is the relationship between the number of sigma (σ) and pi (π) bonds in ethylene
(H2C=CH2)? - Answer Ethylene has 1 π bond and 5 σ bonds.
What is the electron configuration for an atom with atomic number 13? - Answer The
electron configuration for an atom with atomic number 13 (Aluminum) is 1s² 2s² 2p⁶ 3s² 3p¹.
What is the mass of an element per mole of electrons if 48.25 C deposits 31 mg of X? - Answer
To find the mass of X per mole of electrons, you would use Faraday's laws of electrolysis,
considering the charge and the mass deposited.
What is the strongest base among the following: NaOH, KCN, K2CO3? - Answer NaOH is the
strongest base among these options.
What is the significance of standard potentials (E°) in electrochemistry? - Answer Standard
potentials (E°) indicate the tendency of a species to be reduced, with higher values indicating a
greater likelihood of reduction.
What is the role of the anode in an electrolytic cell? - Answer In an electrolytic cell, the
anode is the electrode where oxidation occurs, and it attracts anions.
What is the relationship between pressure and equilibrium in gaseous reactions? - Answer
Increasing the pressure in a gaseous reaction shifts the equilibrium towards the side with fewer
moles of gas.
What is the atomic mass of an element with 20% of 12X and 80% of 13X? - Answer The
atomic mass of X is approximately 12.8.
What is the difference between ionic and covalent bonds? - Answer Ionic bonds are formed
by the transfer of electrons from one atom to another, while covalent bonds are formed by the
sharing of electrons between atoms.
What is the formula for calculating pH? - Answer The formula for calculating pH is pH = -
log[H+], where [H+] is the concentration of hydrogen ions in moles per liter.
Questions and Answers.
What is the Bronsted-Lowry definition? - Answer The Bronsted-Lowry definition states that
an acid is a substance that donates protons (H+), while a base is a substance that accepts
protons.
What is a conjugate acid-base pair? - Answer A conjugate acid-base pair consists of two
species that differ by the presence or absence of a proton. For example, HCN and CN− are a
conjugate acid-base pair.
Which chemical species can function both as an acid and as a base? - Answer The species
that can function both as an acid and a base is called amphoteric. Examples include HCO3− and
H2O.
What is the ionization constant (Ka) of an acid? - Answer The ionization constant (Ka) is a
measure of the strength of an acid in solution, representing the equilibrium constant for the
dissociation of the acid into its ions.
What is the pH of a 0.03 M HCl solution? - Answer The pH of a 0.03 M HCl solution is
approximately 1.5, since HCl is a strong acid and fully dissociates in solution.
What is the strongest acid among HClO, HClO2, HClO3, and HClO4? - Answer HClO4 is the
strongest acid among these options.
What is a buffer solution? - Answer A buffer solution is a solution that resists changes in pH
when small amounts of acid or base are added, typically consisting of a weak acid and its
conjugate base.
What is the significance of the equilibrium constant (K) in a reaction? - Answer The
equilibrium constant (K) indicates the ratio of the concentrations of products to reactants at
equilibrium, providing insight into the extent of the reaction.
What happens to the equilibrium position when the temperature is increased in an exothermic
reaction? - Answer Increasing the temperature in an exothermic reaction shifts the
equilibrium position to the left, favoring the formation of reactants.
What is the Nernst equation? - Answer The Nernst equation relates the cell potential of an
electrochemical cell to the standard electrode potential and the concentrations of the reactants
and products.
, What is hydrolysis in the context of salts? - Answer Hydrolysis is the reaction of a salt with
water, resulting in the formation of an acidic or basic solution depending on the nature of the
ions in the salt.
What is the relationship between the number of sigma (σ) and pi (π) bonds in ethylene
(H2C=CH2)? - Answer Ethylene has 1 π bond and 5 σ bonds.
What is the electron configuration for an atom with atomic number 13? - Answer The
electron configuration for an atom with atomic number 13 (Aluminum) is 1s² 2s² 2p⁶ 3s² 3p¹.
What is the mass of an element per mole of electrons if 48.25 C deposits 31 mg of X? - Answer
To find the mass of X per mole of electrons, you would use Faraday's laws of electrolysis,
considering the charge and the mass deposited.
What is the strongest base among the following: NaOH, KCN, K2CO3? - Answer NaOH is the
strongest base among these options.
What is the significance of standard potentials (E°) in electrochemistry? - Answer Standard
potentials (E°) indicate the tendency of a species to be reduced, with higher values indicating a
greater likelihood of reduction.
What is the role of the anode in an electrolytic cell? - Answer In an electrolytic cell, the
anode is the electrode where oxidation occurs, and it attracts anions.
What is the relationship between pressure and equilibrium in gaseous reactions? - Answer
Increasing the pressure in a gaseous reaction shifts the equilibrium towards the side with fewer
moles of gas.
What is the atomic mass of an element with 20% of 12X and 80% of 13X? - Answer The
atomic mass of X is approximately 12.8.
What is the difference between ionic and covalent bonds? - Answer Ionic bonds are formed
by the transfer of electrons from one atom to another, while covalent bonds are formed by the
sharing of electrons between atoms.
What is the formula for calculating pH? - Answer The formula for calculating pH is pH = -
log[H+], where [H+] is the concentration of hydrogen ions in moles per liter.
