WorksheetsChem 1C Midterm #2 Review
Total questions: 10
Worksheet time: 15mins
For a first-order reaction, a plot of __________ versus __________ is linear.
ln [A]t, t
1/[A]t , t
In [A]t, 1/t
[A]t, t
t, 1/[A]t
Of the following, __________ will lower the activation energy for a reaction.
increasing the concentrations of reactants
adding a catalyst for the reaction
raising the reaction temperature
removing products as the reaction proceeds
increasing the pressure
Consider the reaction:
S2Cl2(l) + CCl4(l) → CS2(g) + 3 Cl2(g) ∆H˚ = 84.3 kJ
If the above reactants and products are contained in a closed vessel and the reaction system is at equilibrium, the number of moles of CS2 can be increased by
adding some S2Cl2
removing some CCl4
decreasing the size of the reaction vessel
increasing the temperature of the reaction system
adding some Cl2
Consider the general dissociation of an acid:
HA(aq) ↔ H+(aq) + A-(aq)
Select the true statement(s):
Increasing the concentration of A- will increase HA dissociation
The stronger the H-A bond, the weaker the acid
The stronger the H-A bond, the stronger the acid
The stronger the H-A bond, the easier it will dissociate
The stronger the H-A bond, the harder it will be to dissociate
Which of the following ions will act as a weak base in water?
ClO-
Cl-
NO3-
OH-
None of the above
Which of the following can be applied when solving for the pH of following dissociation:
HF(aq)+ H2O(l) ↔ H3O+(aq) + F-(aq)
Strong acid approximation, when percent ionization is >100%
Weak acid approximation, when percent ionization is <5%
Weak acid approximation, when percent ionization is >5%
Weak base approximation, when percent ionization is <5%
Select from the following: the solution(s) in which you would have to consider the autoionization of water?
HF and F-, at pH = 6.20
HCN and CN-, at pOH = 6.40
KF, at pH = 8.00
None of the above
Which of the following statements is incorrect?
HNO3 added to a solution of CaC2H3O2 lowers the pH
NaBr added to a solution of HBr increases the pH
NaC2H3O2 added to a solution of HC2H3O2 increases the pH
CaCl2 added to an HCl solution does not alter the pH
KNO3 added to an HCl solution does not alter the pH
A solution that contains a weak acid and its conjugate base in roughly equal concentrations is __________
neither acidic or basic
a heterogeneous mixture
a half-acid solution
neutral
a buffer
The value of Ka for HSO4- is 1 × 10−2. What is the value of Kb for SO42−?
Kb = 1 × 10−12
Kb = 1 × 10−8
Kb = 1 × 10−2
Kb = 1 × 102
Kb = 1 × 105
