Chem 1B Final Concept Q's
D
Choose the situation below that would result in a dHsolution near 0. a. when |dHlattice| < |dHhydration| b. when |dHsolvent| >> |dHsolute| c. when |dHlattice| > |dHhydration| d. when |dHlattice| is close to |dHhydration| e. there isn't enough information to determine
D
Define buffer capacity. a. the amount of base that can be added until all of the acid is used up b. the amount of acid that can be added until all the acid is used up c. the amount of acid that can be added until all of the base is used up d. the amount of acid or base that can be added to a buffer without destroying its effectiveness e. the amount of base that can be added until all of the base is used up
C
Give the equation for a saturated solution in comparing Q with Ksp. a. Q < Ksp b. Q =/= Ksp c. Q = Ksp d. Q > Ksp e. none of the above
D
Give the equation for a supersaturated solution in comparing Q with Ksp. a. Q < Ksp b. Q =/= Ksp c. Q = Ksp d. Q > Ksp e. none of the above
A
Give the equation for an unsaturated solution in comparing Q with Ksp. a. Q < Ksp b. Q =/= Ksp c. Q = Ksp d. Q > Ksp e. none of the above
B
Identify the strongest acid. a. HClO b. HClO4 c. HClO3 d. HClO2 e. not enough information is given
C
Identify the weakest acid. a. HBr b. HCl c. HF d. HI e. not enough information is availabe
C
List the compound in marble that is destroyed by acid rain. a. NaOH b. NH4OH c. CaCO3 d. NaHCO3 e. KOH
D
The highest pH for an effective buffer occurs when the base is how many times as concentrated as the acid? a. 5 b. 15 c. 2 d. 10 e. 20
C
Which of the following concentration units are temperature dependent? a. mole fraction b. mass percent c. molarity d. molality e. none of the above
A
Which of the following is TRUE? a. Dynamic equilibrium occurs when the rate of the forward reaction equals the rate of the reverse action. b. Dynamic equilibrium indicates that the amount of reactants and products are equal. c. The equilibrium constant for the forward reaction is equal to the equilibrium constant for the reverse reaction. d. A reaction quotient (Q) larger than the equilibrium constant (K) means that the reaction will favor the production of more products. e. All of the above are true.
A
Which of the following is TRUE? a. a buffer is most resistant to pH change when [acid] = [conjugate base] b. a buffer cannot be destroyed by adding too much strong base. It can only be destroyed by adding too much strong acid. c. an effective buffer has a [base]/[acid] ratio in the range of 10-100 d. an effective buffer has very small absolute concentrations of acid and conjugate base e. none of the above are true
C
Which of the following is a Lewis acid? a. CH4 b. CHCl3 c. BCl3 d. NH3 e. none of the above are Lewis acids
B
Which of the following is a Lewis base? a. AIF3 b. H2O c. C5H12 d. SiF4 e. none of the above are Lewis bases
C (because weak acid and weak base)
Which of the following solutions is a good buffer system? a. a solution that is 0.10M HF and 0.10M NaC2H3O2 b. a solution that is 0.10M HCl and 0.10M NH4+ c. a solution that is 0.10M HC2H3O2 and 0.10M LiC2H3O2 d. a solution that is 0.10M NaOH and 0.10M KOH e. none of the above are buffer systems
D
Which one of the following statements is TRUE? a. a buffer is an aqueous solution composed of two weak acids b. a buffer does not change pH when strong acid or base is added c. a buffer can absorb an unlimited amount of acid or base d. a buffer resists pH change by neutralizing added acids and bases e. none of the above are true
A
Which one of the following will form an acidic solution in water? a. NH4Cl b. LiI c. KNO3 d. NaF e. None of the above solutions will be acidic