211chp2 - 8/20/10 Chapter 2 Homework Solutions 10. a) 6.116...

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Chapter 2 Homework Solutions 8/20/10 10. a) 6.116 g b) The law of conservation of matter. c) If all matter is composed of atoms, atoms of the same element are identical, and atoms are indestructible, then when a reaction occurs all that happens is that the atoms of the reactants rearrange themselves into products. No atoms are lost or interconverted so the product must way the same as the reactants. 16. a) The droplets carry a charge because a charged particle resides on the droplet. Droplets carrying different total charges mean that different numbers of charged particles reside on the droplets. b) Individual charges are quite small. c) 1.59 x 10 -19 C 22. a) X and X 32 16 31 16 b) Sulfur 24. a) p = 15, n = 17 c) p = 27, n = 33 e) p = 53, n = 78 b) p = 24, n = 27 d) p = 43, n = 56 f) p = 81, n = 120 32. avg atomic weight = [(0.7215)(84.9118 amu) + (0.2785)(86.9092 amu) = 85.47 amu 38. metal = calcium, gallium, platinum, thorium, titanium metalloid = none nonmetal = krypton, selenium
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211chp2 - 8/20/10 Chapter 2 Homework Solutions 10. a) 6.116...

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