answersnotinmanual159 - ANSWERS TO ASSIGNED HOMEWORK...

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ANSWERS TO ASSIGNED HOMEWORK PROBLEMS NOT ANSWERED IN THE STUDENT SOLUTIONS MANUAL (listed in the order given on the syllabus) Chapter 1 71. 3.0 x 10 3 kg 32. density = 7.25 g/cm 3 37. (a) 1.2 x 10 4 in 2 (b) 1.49 x 10 5 cm 2 39. 8.32 x 10 3 m 43. (a) 5.0 8 (b) 50 8 (c) 5.0 80 x 10 3 (d) 0.050 80 45. (a) 3.8 g (b) 1.0 mL (c) 565 cm 3 Chapter 2 26. Z gives the number of protons, N gives the number of neutrons, and A is the mass number: N = A – Z. (a) These have different numbers of protons, neutrons, and electrons, but have the same A value. (b) These have the same number of neutrons, but different numbers of protons and electrons and different A values. (c) These have the same number of protons and electrons, but different numbers of neutrons and different A values. 32. 24.31 amu 37. Metals are generally hard, shiny, malleable, ductile, good conductors of heat and electricity, and form positive ions by losing electrons. Nonmetals are generally soft, brittle, dull, poor conductors of heat and electricity, and form negative ions by gaining electrons. 46. KNO 3 shows both ionic and covalent bonding: covalent bonding between N and O in NO 3 and ionic bonding between NO 3 and K + . 54. MgO has stronger ionic attraction due to the larger positive ionic charge. 64. (a) sodium hydrogen phosphate (b) K 2 CO 3 2 H 2 O (c) sodium nitrite (d) NH 4 ClO 4 74. (a) Na 2 Cr 2 O 7 261.98 amu (b) NH 4 ClO 4 117.49 amu (c) Mg(NO 2 ) 2 3 H 2 O 170.37 amu 68. (a) perchloric acid, HClO 4 (b) nitric acid, HNO 3 (c) bromous acid, HBrO 2 (d) hydrofluoric acid, HF 78. (a) copper(II) sulfate pentahydrate (b) calcium hydroxide (c) sulfuric acid (d) sodium carbonate (e) hydrochloric acid (f) magnesium sulfate heptahydrate (g) calcium carbonate (h) carbon dioxide (i) sodium hydrogen carbonate (j) sodium hydroxide 80. A homogeneous mixture is uniform in its macroscopic, intensive properties. A heterogeneous mixture exhibits differences in these properties from one part of the mixture to another. The properties vary discontinuously along at least one macroscopically observable boundary. (For example, the value of the density may jump from one numerical value to a different numerical value as a boundary is crossed.) In some cases, boundaries can be seen only with a microscope. Chapter 3 1. 53.96 g Al ; 106.35 g Cl 3. A mole of nitrogen could be interpreted as a mole of nitrogen atoms or as a mole of nitrogen molecules. Be specific to avoid confusion. The same problem is possible with other diatomic or polyatomic molecules, for example, Cl 2 , Br 2 , S 8 , P 4 . 23. 4 30. (a) Fe 3 O 4 (b) PBr 3 (c) CH 3
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35. Students I and II are incorrect. Student I failed to identify the product correctly, and Student II used atomic chlorine instead of molecular chlorine as a reactant. Student III is correct. 60.
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This note was uploaded on 04/03/2008 for the course CHEM 159-160 taught by Professor Zbaida during the Fall '07 term at Rutgers.

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answersnotinmanual159 - ANSWERS TO ASSIGNED HOMEWORK...

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