Knewton's Alta Module 13 test- with
Questions with 100% Correct Answers
Covalent electrolytes are typically:
A) strong acid
B) weak electrolytes
C) ionic electrolytes
D) depends on the substance - Answer D) depends on the substance
Covalent electrolytes can be strong or weak, depending on the strength of the acid
or base. Strong acids and bases are typically strong electrolytes. Nonelectrolytes do
not dissociate into ions in solution; nonelectrolyte solutions do not, therefore,
conduct electricity.
What types of interactions occur between ions and water molecules that promote
the dissolution process?
A) ion-ion
B) ion-dipole
C) dipole-dipole
D) ionic bonding - Answer B) ion-dipole
Identify the option below that is not true of ionic electrolytes.
A) They must be ionic compounds.
B) They are often soluble in water.
,C) They must be completely soluble in water.
D) They yield ions by their dissociation in water. - Answer C) They must be completely
soluble in water.
A) a chemical change that yields ions
B) a physical change that yields ions
C) either of the above
D) neither of the above - Answer C) either of the above
True of false: a strong electrolyte always forms a very concentrated solution and a
weak electrolyte always forms a very dilute solution. - Answer False
Which of the following are true regarding dissociation?
A) During dissociation, water molecules surround and solvate ions.
B) Dissociation decreases the electrostatic attractions between ions.
C) Dissociation is a physical process.
D) Ionic compounds rarely dissociate completely. - Answer A, B, & C
Which substance, when dissolved in water, will conduct the most electricity?
A) ethanol
B) potassium chloride
C) acetic acid
D) ammonia - Answer B) potassium chloride
Which of the following occurs when an ionic compound dissolves in a polar solvent
such as water?
A) The water molecules chemically react with the ions.
, B) The disorder of the ionic salt is decreased.
C) The water molecules attract both the anions and cations in the ionic salt.
D) The ions become solvated water molecules, which reduces the electrostatic
attractions between the ions. - Answer A&D
Of the following, which are characteristics of weak electrolytes?
A) They produce a low concentration of ions when dissolved in water.
B) They are soluble in water.
C) They exhibit no conductivity.
D) They exhibit low conductivity. - Answer A, B, and D
If a compound undergoes a chemical reaction and the reaction is essentially
100% complete, the compound could have been a: (select all that apply)
A) weak acid
B) strong acid
C) weak base
D) strong base - Answer B and D
Which of the following are not true of covalent electrolytes?
A) They contain only covalent bonds.
B) They may contain ions.
C) All soluble covalent compounds are covalent electrolytes.
D) Solutions prepared from covalent compounds conduct electricity. - Answer B and C
Which of the following gives the definition of ion-dipole attraction?
A) Ion-dipole attraction is attraction between an ion and the polar bond(s) in a
nonpolar molecule.
Questions with 100% Correct Answers
Covalent electrolytes are typically:
A) strong acid
B) weak electrolytes
C) ionic electrolytes
D) depends on the substance - Answer D) depends on the substance
Covalent electrolytes can be strong or weak, depending on the strength of the acid
or base. Strong acids and bases are typically strong electrolytes. Nonelectrolytes do
not dissociate into ions in solution; nonelectrolyte solutions do not, therefore,
conduct electricity.
What types of interactions occur between ions and water molecules that promote
the dissolution process?
A) ion-ion
B) ion-dipole
C) dipole-dipole
D) ionic bonding - Answer B) ion-dipole
Identify the option below that is not true of ionic electrolytes.
A) They must be ionic compounds.
B) They are often soluble in water.
,C) They must be completely soluble in water.
D) They yield ions by their dissociation in water. - Answer C) They must be completely
soluble in water.
A) a chemical change that yields ions
B) a physical change that yields ions
C) either of the above
D) neither of the above - Answer C) either of the above
True of false: a strong electrolyte always forms a very concentrated solution and a
weak electrolyte always forms a very dilute solution. - Answer False
Which of the following are true regarding dissociation?
A) During dissociation, water molecules surround and solvate ions.
B) Dissociation decreases the electrostatic attractions between ions.
C) Dissociation is a physical process.
D) Ionic compounds rarely dissociate completely. - Answer A, B, & C
Which substance, when dissolved in water, will conduct the most electricity?
A) ethanol
B) potassium chloride
C) acetic acid
D) ammonia - Answer B) potassium chloride
Which of the following occurs when an ionic compound dissolves in a polar solvent
such as water?
A) The water molecules chemically react with the ions.
, B) The disorder of the ionic salt is decreased.
C) The water molecules attract both the anions and cations in the ionic salt.
D) The ions become solvated water molecules, which reduces the electrostatic
attractions between the ions. - Answer A&D
Of the following, which are characteristics of weak electrolytes?
A) They produce a low concentration of ions when dissolved in water.
B) They are soluble in water.
C) They exhibit no conductivity.
D) They exhibit low conductivity. - Answer A, B, and D
If a compound undergoes a chemical reaction and the reaction is essentially
100% complete, the compound could have been a: (select all that apply)
A) weak acid
B) strong acid
C) weak base
D) strong base - Answer B and D
Which of the following are not true of covalent electrolytes?
A) They contain only covalent bonds.
B) They may contain ions.
C) All soluble covalent compounds are covalent electrolytes.
D) Solutions prepared from covalent compounds conduct electricity. - Answer B and C
Which of the following gives the definition of ion-dipole attraction?
A) Ion-dipole attraction is attraction between an ion and the polar bond(s) in a
nonpolar molecule.
