c118 mc ws topic 3
Which one of the following is expected to be the strongest Lewis acid? A) Fe B) Fe+ C) Fe2+ D) Fe3+
D) Fe3+
What is the strongest acid among the following? A) H2O B) H2S C) H2Se D) H2Te
D) H2Te
The equilibrium constant, K, for the reaction shown below has a value 1.8 × 10-5. In this reaction which is the strongest acid and which is the strongest base? CH3CO2H(aq) + H2O(l) ⇌ H3O+(aq) + CH3CO2-(aq) A) CH3CO2H and CH3CO2- B) CH3CO2H and H2O C) H3O+ and H2O D) H3O+ and CH3CO2-
D) H3O+ and CH3CO2-
What is the strongest acid among the following? A) HF B) HCl C) HBr D) HI
D) HI
Using the conjugate acid-base pairs listed below, complete the following equation with the pair that gives an equilibrium constant Kc > 1. ________ + HSO3- ⇌ ________ + H2SO3 A) CH3CO2H/ CH3CO2- B) HCO2H/ HCO2- C) HNO2/NO2- D) HNO3/NO3-
D) HNO3/NO3-
What is the second stepwise equilibrium constant expression for phosphoric acid H3PO4? A) Ka2 = ([H3O+][H2PO4-])/([H3PO4]) B) Ka2 = ([H3O+]2[HPO42-])/([H3PO4]) C) Ka2 = ([H3O+]3[PO43-])/([H3PO4]) D) Ka2 = ([H3O+][HPO42-])/([H2PO4-])
D) Ka2 = ([H3O+][HPO42-])/([H2PO4-])
What is the conjugate base of the Brønsted-Lowry acid HPO42-? A) H3PO4 B) H2PO4- C) HPO42- D) PO43-
D) PO43-
K>1
favors products
K<1
favors reactants
Which of the following species cannot act as a Lewis base? A) O2- B) CH4 C) H2O D) NH3
B) CH4
From the following chemical reactions determine the relative Brønsted-Lowry acid strengths (strongest to weakest).HCl(aq) + H2O(l) → H3O+(aq) + Cl-(aq) HCN(aq) + H2O(l) ⇌ H3O+(aq) + CN-(aq) A) HCl > HCN > H3O+ B) HCl > H3O+ > HCN C) H3O+ > HCl > HCN D) HCN > H3O+ > HCl
B) HCl > H3O+ > HCN
What is the equilibrium constant expression (Ka) for the acid dissociation of hydrocyanic acid HCN? The equation of interest is HCN(aq) + H2O(l) ⇌ H3O+(aq) + CN-(aq). A) Ka = ([H3O+][CN-])/([HCN][H2O]) B) Ka = ([H3O+][CN-])/([HCN]) C) Ka = ([HCN][H2O])/([H3O+][CN-]) D) Ka = ([HCN])/([H3O+][CN-])
B) Ka = ([H3O+][CN-])/([HCN])
Identify the Lewis acid that acts as a reactant in the following reaction. Fe(H2O)63+(aq) + 6 CN-(aq) → Fe(CN)63-(aq) + 6 H2O(l) A) Fe3+ B) H2O C) CN- D) Fe(H2O)63+
A) Fe3+
From the following chemical reactions determine the relative Brønsted-Lowry base strengths (strongest to weakest).2 NaH(s) + H2O(l) → 2 NaOH + H2(g) NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH-(aq) A) H- > OH- > NH3 B) H- > NH3 > OH- C) OH-> H- > NH3 D) OH- > NH3 > H-
A) H- > OH- > NH3
When dissolved in water, which of the following compounds is an Arrhenius acid? A) HCN B) NaOH C) NaF D) CH3CH2OH
A) HCN
What is the strongest Brønsted-Lowry acid in the chemical reaction shown below?2 HNO3(aq) + Ba(OH)2(aq) → Ba(NO3)2(aq) + 2 H2O(l) A) HNO3 B) Ba(OH)2 C) Ba(NO3)2 D) H2O
A) HNO3
Identify the conjugate acid/base pairs present in an aqueous solution of hydrogen sulfate ion, HSO4-. A) HSO4-/SO42- and H3O+/H2O B) H2SO4/HSO4- and H2O/OH- C) HSO4-/H2O and H3O+/SO42- D) HSO4-/H2O and H2SO4/OH-
A) HSO4-/SO42- and H3O+/H2O
Which of the following can be classified as a weak base? A) CH3NH2 B) NH2OH C) Both CH3NH2 and NH2OH D) Neither CH3NH2 nor NH2OH
C) Both CH3NH2 and NH2OH
What are the Brønsted-Lowry bases in the following chemical reaction?C5H5N(aq) + H2O(l) ⇌ C5H5NH+(aq) + OH-(aq) A) C5H5N, H2O B) C5H5N, C5H5NH+ C) C5H5N, OH- D) C5H5N, H2O, OH-
C) C5H5N, OH-
Using the conjugate acid-base pairs listed below, complete the following equation with the pair that gives an equilibrium constant Kc > 1. ________ + H2CO3 ⇌ ________ + HCO3- A) HF/F- B) HCl/Cl- C) HOCl/OCl- D) HSO42-/SO42-
C) HOCl/OCl-
arrhenius acid and arrhenius base
acid= dissociates in water to produce H+ base= dissociates in water to produce OH-
lewis acid and lewis base
acid= electron-pair acceptor base= electron-pair donor
bronsted-lowry acid and bronsted-lowry base
acid= proton donor base= proton acceptor
