Page 1051 - Chemistry--atom first

Chapter 18 | Representative Metals, Metalloids, and Nonmetals 1041
4. Predict the best choice in each of the following. You may wish to review the chapter on electronic structure for relevant examples.
(a) the most metallic of the elements Al, Be, and Ba
(b) the most covalent of the compounds NaCl, CaCl2, and BeCl2
(c) the lowest first ionization energy among the elements Rb, K, and Li
(d) the smallest among Al, Al+, and Al3+
(e) the largest among Cs+, Ba2+, and Xe
5. Sodium chloride and strontium chloride are both white solids. How could you distinguish one from the other?
6. The reaction of quicklime, CaO, with water produces slaked lime, Ca(OH)2, which is widely used in the
construction industry to make mortar and plaster. The reaction of quicklime and water is highly exothermic:

(a) What is the enthalpy of reaction per gram of quicklime that reacts?
(b) How much heat, in kilojoules, is associated with the production of 1 ton of slaked lime?
7. Write a balanced equation for the reaction of elemental strontium with each of the following:
(a) oxygen
(b) hydrogen bromide
(c) hydrogen
(d) phosphorus
(e) water
8. How many moles of ionic species are present in 1.0 L of a solution marked 1.0 M mercury(I) nitrate?
9. What is the mass of fish, in kilograms, that one would have to consume to obtain a fatal dose of mercury, if the
fish contains 30 parts per million of mercury by weight? (Assume that all the mercury from the fish ends up as mercury(II) chloride in the body and that a fatal dose is 0.20 g of HgCl2.) How many pounds of fish is this?
10. The elements sodium, aluminum, and chlorine are in the same period.
(a) Which has the greatest electronegativity?
(b) Which of the atoms is smallest?
(c) Write the Lewis structure for the simplest covalent compound that can form between aluminum and chlorine.
(d) Will the oxide of each element be acidic, basic, or amphoteric?
11. Does metallic tin react with HCl?
12. What is tin pest, also known as tin disease?
13. Compare the nature of the bonds in PbCl2 to that of the bonds in PbCl4.
14. Is the reaction of rubidium with water more or less vigorous than that of sodium? How does the rate of reaction
of magnesium compare?
18.2 Occurrence and Preparation of the Representative Metals
15. Write an equation for the reduction of cesium chloride by elemental calcium at high temperature.
16. Why is it necessary to keep the chlorine and sodium, resulting from the electrolysis of sodium chloride,
separate during the production of sodium metal?
17. Give balanced equations for the overall reaction in the electrolysis of molten lithium chloride and for the reactions occurring at the electrodes. You may wish to review the chapter on electrochemistry for relevant examples.