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Chemistry: The Central Science

Chemistry: The Central Science answer keys

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Chemistry: The Central Science

Chapter 1 1.1 (a) Pure element: i, v (b) mixture of elements: vi (c) pure compound: iv (d) mixture of an element and a compound: ii, iii 1.5 (a) 7.5 cm, 2 significant figures (sig figs) (b) 140?C, 2 sig figs 1.8 1.9 (a) Heterogeneous mixture (b) homogeneous mixture (heterogeneous if there are undissolved particles) (c) pure sub- stance (d) homogeneous mixture. 1.11 (a) S (b) K (c) Cl (d) Cu (e) Si (f) N (g) Ca (h) He 1.13 (a) Lithium (b) alu- minum (c) lead (d) sulfur (e) bromine (f) tin (g) chromium (h) zinc 1.15 C is a compound; it contains carbon and oxygen. A is a compound; it contains at least carbon and oxygen. B is not defined by the data given; it is probably a compound be- cause few elements exist as white solids. 1.17 Physical prop-
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