hw1sol - H omework #1 Solutions 1-9. (a) diamond, element,...

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3.091 Fall Term 2004 Homework #1 Solutions 1-9. (a) diamond, element, nonmetal (b) brass, mixture, metals; (c) soil, mixture, contains metal and nonmetals (g) salt, compound, composed of metal and nonmetal (h) iron, element, metal (i) steel, mixture, metal 1-39. Z A e 31 P 15 31 15 18 O 8 18 8 39 K 19 39 19 58 Ni 28 58 28 1-47. Three: 16 O, 17 O, 18 O. 1-48. All have the same number of protons but different numbers of neutrons. 1-49. 1.99268 × 10 –23 g; 12.0000 amu 1-50. 1200.0 amu, 1300.3 amu 1-51. (b) The random selection will include isotopes 12 C and 13 C. 1-62. Fluorapatite, Ca 5 (PO 4 ) 3 F contains 5 Ca 2+ and 3 PO 4 3– ions, therefore, there is a charge of (5)(+2) + 3(–3) = 10 – 9 remaining after counting up the contribution of the Ca 2+ and PO 4 3– ions. Since fluorapatite is a neutral molecule, the charge on the fluoride ion must be –1. 1-88. Element X is a metal whose chemical properties are similar to potassium. There is only one isotope of element X. The mass of X in amu is 22.98976. Use the trends in masses in Table 1.4 to identify element X.
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hw1sol - H omework #1 Solutions 1-9. (a) diamond, element,...

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