Page 1059 - Chemistry--atom first

Chapter 18 | Representative Metals, Metalloids, and Nonmetals 1049
88. Write a balanced chemical equation for the reaction of an excess of oxygen with each of the following. Remember that oxygen is a strong oxidizing agent and tends to oxidize an element to its maximum oxidation state.
(a) Mg
(b) Rb
(c) Ga
(d) C2H2
(e) CO
89. Which is the stronger acid, H2SO4 or H2SeO4? Why? You may wish to review the chapter on acid-base equilibria.
18.10 Occurrence, Preparation, and Properties of Sulfur
90. Explain why hydrogen sulfide is a gas at room temperature, whereas water, which has a lower molecular mass, is a liquid.
91. Give the hybridization and oxidation state for sulfur in SO2, in SO3, and in H2SO4.
92. Which is the stronger acid, NaHSO3 or NaHSO4?
93. Determine the oxidation state of sulfur in SF6, SO2F2, and KHS.
94. Which is a stronger acid, sulfurous acid or sulfuric acid? Why?
95. Oxygen forms double bonds in O2, but sulfur forms single bonds in S8. Why?
96. Give the Lewis structure of each of the following:
(a) SF4
(b) K2SO4
(c) SO2Cl2
(d) H2SO3
(e) SO3
97. Write two balanced chemical equations in which sulfuric acid acts as an oxidizing agent.
98. Explain why sulfuric acid, H2SO4, which is a covalent molecule, dissolves in water and produces a solution that
contains ions.
99. How many grams of Epsom salts (MgSO4⋅7H2O) will form from 5.0 kg of magnesium?
18.11 Occurrence, Preparation, and Properties of Halogens
100. What does it mean to say that mercury(II) halides are weak electrolytes?
101. Why is SnCl4 not classified as a salt?
102. The following reactions are all similar to those of the industrial chemicals. Complete and balance the
equations for these reactions:
(a) reaction of a weak base and a strong acid

(b) preparation of a soluble silver salt for silver plating

(c) preparation of strontium hydroxide by electrolysis of a solution of strontium chloride

103. Which is the stronger acid, HClO3 or HBrO3? Why?
104. What is the hybridization of iodine in IF3 and IF5?