Unit 5 Practice Quiz
If the pH of a certain soft drink is 3.60, what is the H3O+ concentration in the soft drink?
2.5 x 10-4 M
If the pH of a blood sample is 7.60, what is the H3O+ concentration in the blood?
2.5 x 10-8 M
Consider the reaction: 2HgO(s) → 2Hg(l) + O2(g) Which of the following statements is correct?
All of these statements are correct.
What are the oxidation numbers of the atoms in the AsO43- ion?
As = 5+, O = 2-
In which compound does bromine have an oxidation number of 3+?
Br2O3
When the following reaction goes in the reverse direction (from products to reactants), what is the base? HCN(aq) + H2O(l) ⇌ CN-(aq) + H3O+(aq)
CN-
Select the two Brønsted-Lowry bases in the following equation: CO32-(aq) + H2O(l) ⇌ HCO3-(aq) + OH-(aq)
CO32- and OH-
The conjugate base of HCO3- is:
CO32−
Consider the reaction: Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g) Which of the following statements is correct?
Calcium is oxidized.
For the following reaction, what is the oxidizing agent? 2Cl2(g) + C(s) + 2H2O(l) → CO2(g) + 4HCl(aq)
Cl2
In which of the following choices is the oxidation number incorrect?
Cl2(s); oxidation number = 1-
In which substance does chlorine have an oxidation number of 4+?
ClO2
In which of the following choices is the oxidation number incorrect?
Cu(s); oxidation number = 2+
The cathode is the electrode at which oxidation occurs.
False
Consider the following oxidation-reduction reaction: 2Fe3+(aq) + 2Hg(l) + 2Cl-(aq) → 2Fe2+(aq) + Hg2Cl2(s) Which one of the following pairs correctly indicates the oxidizing agent and the reducing agent in this reaction? Oxidizing agent Reducing agent
Fe3+(aq) Hg(l)
Which one of the following reactions is an example of an oxidation-reduction reaction?
H2(g) + F2(g) → 2HF(g)
In which of the following choices is the oxidation number incorrect?
H2(s); oxidation number = 1+
The conjugate acid of HCO3- is:
H2CO3
Select the pair that consists of an acid and its conjugate base in that order.
H2CO3/HCO3-
Which of the following equations represents the behavior of H2PO4- as an acid?
H2PO4-(aq) + OH-(aq) ⇌ HPO4-(aq) + H2O(l)
Select the pair that consists of an acid and its conjugate base in that order.
H2SO3/HSO3−
The conjugate acid of H2PO4- is:
H3PO4
The H2PO4- ion is amphoteric. What are the conjugate acid and conjugate base, in that order, of H2PO4-?
H3PO4, HPO42-
Select the two Brønsted-Lowry acids in the following equation: HCN(aq) + H2O(l) ⇌ CN−(aq) + H3O+(aq)
HCN and H3O+
Which of the following equations represents the behavior of HCO3- as an acid?
HCO3-(aq) + OH-(aq) ⇌ CO32-(aq) + H2O(l)
Select the two Brønsted-Lowry acids in the following equation: HNO2(aq) + H2O(l) ⇌ NO2-(aq) + H3O+(aq)
HNO2 and H3O+
The conjugate base of H2PO4- is:
HPO42-
Consider the following reaction: 2Fe3+(aq) + 2Hg(l) + 2Cl−(aq) → 2Fe2+(aq) + Hg2Cl2(s) In this reaction,
Hg(l) loses electrons.
Consider the reaction: N2(g) + 3H2(g) → 2NH3(g) Which of the following statements is correct?
Hydrogen is the reducing agent.
Select the two Brønsted-Lowry bases in the following equation: NH3(aq) + H2O(aq) ⇌ NH4+(aq) + OH-(aq)
NH3 and OH-
Select the pair that consists of a base and its conjugate acid in that order.
NH3/NH4+
When sodium hydroxide, NaOH, is dissolved in water, which species are present in addition to water?
Na+(aq) and OH−(aq)
In which compound does phosphorus have an oxidation number of 3-?
PH3
The ion shown has a charge of 2-. What are the oxidation numbers of the atoms in the ion?
S = 6+, O = 2-
When a piece of copper wire is placed in a colorless solution of silver nitrate, the surface of the wire becomes coated with a shiny silvery material, and the copper begins to form aqueous copper(II) nitrate, which is blue. Which of the following statements regarding this reaction is correct?
The solution will become more blue as the reaction progresses.
When a strip of zinc metal is placed in a blue aqueous solution of copper(II) sulfate, the surface of the zinc becomes coated with a reddish solid, and the zinc begins to dissolve to form aqueous zinc sulfate. Which of the following statements regarding this reaction is correct?
The solution will lose its blue color as the reaction progresses.
Which of the following statements regarding oxidation-reduction reactions is correct?
You can tell that a substance is oxidized if it loses electrons.
Given an OH- concentration of 0.10 M, calculate the H3O+ concentration, and then identify the solution as acidic, basic, or neutral.
[H3O+] = 1.0 × 10-13, basic
In any electrolytic cell, the cathode is the electrode
at which reduction occurs.
The change, Br2 + H2O → HOBr + HBr, is
both oxidation and reduction.
Calculate the pH of a solution that has [H3O+] = 5.9 x 10-5 M.
pH = 4.23
Calculate the pH of a solution that has [H3O+] = 1.0 × 10-6 M.
pH = 6.00
Calculate the pH of a solution that has [OH-] = 1.0 × 10-8 M.
pH = 6.00
Calculate the pH of a solution that has [H3O+] = 5.2 x 10-7 M.
pH = 6.28
Calculate the pH of a solution that has [H3O+] = 5.2 × 10-7 M.
pH = 6.28
Calculate the pH of a solution that has [OH-] = 3.1 × 10-8 M.
pH = 6.49
Calculate the pH of a solution that has [H3O+] = 1.0 x 10-7 M.
pH = 7.00
Calculate the pH of a solution that has [H3O+] = 3.1 × 10-8 M.
pH = 7.51
Calculate the pOH of a solution that has [OH-] = 5.9 x 10-5 M.
pOH = 4.23
