38.The chlor-alkali process produces chlorine, Cl2(g), in large quantities. What other industrially important substances are produced in this process?A)Na(s), H2(g)D)Na(s), O2(g)B)H2(g), O2(g)E)NaOH(aq), H2(g)C)Hg(l), NaCl(s)Ans: E
Difficulty: M39.Describe, and give reasons for, the fundamental bonding differences between transition metal sulfides and transition metal oxides.
Difficulty: M40.Give two important reasons why there is so much more Na+in the oceans than K+, despite their similar abundances in the earth's crust.
Difficulty: M41.The mass of the atmosphere has been estimated to be 5.2 1021g, while the average molar mass of atmospheric gases is 28.9 g/mol. If the concentration of carbon dioxide inthe atmosphere is 360 ppm by volume, calculate the mass of this gas in the atmosphere, in billions of metric tons, bmt. (1 bmt = 10
42.Briefly describe the three main pathways for nitrogen fixation.Ans:
Difficulty: MPage 130