Back
Problem 21.138d
In acidic aqueous solution, the complex trans-[Co(en)2Cl1]2+(aq) undergoes the following substitution reaction:
trans-[Co(en)1Cl2]+(aq) + H2O(l) → trans-[Co(en)2(H2O)Cl]2+(aq) + Cl–(aq)
The reaction is first order in trans-[Co(en)2Cl2]+(aq), and the rate constant at 25°C is 3.2×10–5 s–1.
(d) Is the reaction product chiral or achiral? Explain.
Problem 21.137e
The complete reaction of 2.60 g of chromium metal with 50.00 mL of 1.200 M H2SO4 in the absence of air gave a blue solution and a colorless gas that was collected at 25°C and a pressure of 735 mm Hg. (e) When an excess of KCN is added to the solution, the color changes, and the paramagnetism of the solution
decreases. Explain.
Problem 21.138e
In acidic aqueous solution, the complex trans-[Co(en)2Cl1]2+(aq) undergoes the following substitution reaction:
trans-[Co(en)2Cl1]+(aq) + H2O(l) → trans-[Co(en)2(H2O)Cl]2+(aq) + Cl–(aq)
The reaction is first order in trans-[Co(en)2Cl2]+(aq), and the rate constant at 25°C is 3.2×10–5 s–1.
e. Draw a crystal field energy-level diagram for trans-[Co(en)2Cl2]+ that takes account of the fact that Cl– is a weaker-field ligand than ethylenediamine.
Problem 26a
Locate on the periodic table the transition elements with the following electron configurations. Identify each element.
(a) [Ar] 3d74s2
(b) [Ar] 3d54s1
Problem 26b
Locate on the periodic table the transition elements with the following electron configurations. Identify each element.
(c) [Kr] 4d25s2
(d) [Xe] 4f36s2
Problem 32
What is the systematic name for each of the following molecules or ions? Include cis or trans prefixes for diastereoisomers. Platinum is Pt(II) in square planar complexes and Pt(IV) in octahedral complexes.
(1)
(2)
(3)
(4)
Problem 34a
Consider the following ethylenediamine complexes.
(a) Which complexes are chiral, and which are achiral?
(b) Draw the enantiomer of each chiral complex.
(c) Which, if any, of the chiral complexes are enantiomers of one another?
- Use the periodic table to provide the electron configuration for each of the following atoms and ions: (a) Co (b) Co2+
Problem 36
Problem 36c,d
Use the periodic table to give the electron configuration for each of the following atoms and ions.
(c) Co(V) in CoO43–
(d) Co(IV) in CoF62–
Problem 40
Titanium, used to make jet aircraft engines, is much harder than potassium or calcium. Explain.
Problem 41
Molybdenum (mp 2623 °C) has a higher melting point than yttrium (mp 1522 °C) or cadmium (mp 321 °C). Explain.
Problem 42
Briefly account for each of the following observations:
(a) Atomic radii decrease in the order Sc > Ti > V.
(b) Densities increase in the order Ti > V > Cr.
Problem 43
Arrange the following atoms in order of decreasing atomic radius, and account for the trend.
(a) Cr
(b) Ti
(c) Mn
(d) V
Problem 44
What is the lanthanide contraction, and why does it occur?
- Which element is more easily oxidized, Ti or Zn?
Problem 48
- Which element is more easily oxidized, Sc or Co?
Problem 49
- Write a balanced net ionic equation for the reaction of each of the following metals with dilute sulfuric acid in the absence of air. If no reaction occurs, indicate N.R.: (a) Mn (b) Ag (c) Sc (d) Ni.
Problem 51
Problem 52
Which of the following transition metals have more than one oxidation state?
(a) Ti
(b) V
(c) Cr
(d) Zn
- Which is the stronger oxidizing agent, Cr2+ or Cu2+? Explain.
Problem 56
- Which is the stronger reducing agent, Ti2+ or Ni2+? Explain.
Problem 57
Problem 58
Do you expect a compound with vanadium in the +2 oxidation state to be an oxidizing or a reducing agent? Explain.
- Arrange the following substances in order of increasing strength as an oxidizing agent, and account for the trend. (a) Cr2+ (b) Cr3+ (c) Cr2O72-
Problem 61
Problem 62a
What is the coordination number of the metal in each of the following complexes?
(a) AgCl2-
(b) [Cr(H2O)5Cl]2+
(c) [Co(NCS)4]2-
Problem 62d
What is the coordination number of the metal in each of the following complexes?
(d) [ZrF8]4-
(e) [Fe(EDTA)(H2O)]-
- What is the coordination number of the metal in each of the following complexes? (a) [Ni(CN)5]3- (b) Ni(CO)4 (c) [Co(en)2(H2O)Br]2+ (d) [Cu(H2O)2(C2O4)2]2- (e) Co(NH3)3(NO2)3
Problem 63
Problem 66
Identify the oxidation state of the metal in each of the following compounds.
(a) Co(NH3)3(NO2)3
(b) [Ag(NH3)2]NO3
(c) K3[Cr(C2O4)2Cl2]
(d) Cs[CuCl2]
Problem 68
What is the formula, including the charge, for each of the following complexes?
(a) An iridium(III) complex with three ammonia and three chloride ligands
(b) A chromium(III) complex with two water and two oxalate ligands
(c) A platinum(IV) complex with two ethylenediamine and two thiocyanate ligands
Problem 69
What is the formula, including the charge, for each of the following complexes?
(a) An iron(III) complex with six water ligands
(b) A nickel(II) complex with two ethylenediamine and two bromide ligands
(c) A platinum(II) complex with two chloride and two ammonia ligands
- Draw the structure of the platinum ethylenediamine complex [Pt(en)2]2+. Describe the coordination geometry, and identify any chelate rings. What are the coordination number and the oxidation state of the platinum?
Problem 71
Problem 72a
Draw the structure of the following complexes. What are the oxidation state, coordination number, and coordination geometry of the metal in each?
(a) Na[Au(CN)2]