7. During reactions, the element Na gives up one of its electrons to become the cation, Na+. Which of the following will be its correct electronic configuration as a cation Na+? * A. 1s2 2s2 2p6 3s1 B. 1s2 2s2 2p6 3s C. 1s2 2s2 2p6 D. 1s2 2s2 2p5 8. Which of the following biochemical reactions is water produced as a by- product such as what happens when we metabolize our food? * A. combination B. dehydration synthesis C. hydrolysis D. redox

7. During reactions, the element Na gives up one of its electrons to become the cation, Na+. Which of the following will be its correct electronic configuration as a cation Na+? * A. 1s2 2s2 2p6 3s1 B. 1s2 2s2 2p6 3s C. 1s2 2s2 2p6 D. 1s2 2s2 2p5 8. Which of the following biochemical reactions is water produced as a by- product such as what happens when we metabolize our food? * A. combination B. dehydration synthesis C. hydrolysis D. redox

Living by Chemistry

2nd Edition

ISBN:9781464142314

Author:Angelica M. Stacy

Publisher:Angelica M. Stacy

ChapterU2: Smells: Molecular Structure And Properties

Section: Chapter Questions

Problem 10STP

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The compound hexaazaisowurtzitane is one of the highest-energy explosives known (C E News, Jan. 17, 1994, p. 26). The compound, also known as CL-20, was first synthesized in 1987. The method of synthesis and detailed performance data are still classified because of CL-20s potential military application in rocket boosters and in warheads of smart weapons. The structure of CL-20 is In such shorthand structures, each point where lines meet represents a carbon atom. In addition, the hydrogens attached to the carbon atoms are omitted; each of the six carbon atoms has one hydrogen atom attached. Finally, assume that the two O atoms in the NO2 groups are attached to N with one single bond and one double bond. Three possible reactions for the explosive decomposition ofCL-20 are i. C6H6N12O12(s)6CO(g)+6N2(g)+3H2O(g)+32O2(g) ii. C6H6N12O12(s) 3CO(g) + 3CO2(g) + 6N2(g) + 3H2O(g) iii. C6H6N12O12(s) 6CO2(g) + 6N2(g) + 3H2 (g) a. Use bond energies to estimate E for these three reactions. b. Which of the above reactions releases the largest amount of energy per kilogram of CL-20?
Think of forming an ionic compound as three steps (this is a simplification, as with all models): (I) removing an electron from the metal; (2) adding an electron to the nonmetal; and (3) allowing the metal cation and nonmetal anion to come together. a. What is the sign of the energy change for each of these three processes? b. In general, what is the sign of the sum of the first two processes? Use examples to support your answer. c. What must be the sign of the sum of the three process d. Given your answer to part c, why do ionic bonds occur? e. Given your above explanations, why is NaCl stable but not Na2Cl? NaCl2? What about MgO compared to MgO2? Mg2O?
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The two most common elemental forms of carbon are diamond and ________ .
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