chapter4_1hw - CHAPTER 4 THE MAJOR CLASSES OF CHEMICAL...

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4-1 CHAPTER 4 THE MAJOR CLASSES OF CHEMICAL REACTIONS 4.5 a) 2 — This is the only solution containing a divalent cation (Ca 2+ ). b) 3 — This is the only solution containing a divalent anion (SO 4 2– ). c) 1 — This is the only solution where both the cation (NH 4 + ) and the anion (Br ) are univalent. 4.8 The interaction with water depends on the structure of the molecule. If the interaction is good, the substance will be soluble; otherwise, the substance will not be very soluble. For example, if a covalent molecule contains polar groups, they will interact well with the polar solvent water. A few covalent molecules, such as HCl, produce ions when dissolving in water. 4.11 a) Lithium nitrate, an ionic compound, would be expected to be soluble in water, and the solubility rules confirm this. b) Glycine (H 2 NCH 2 COOH) is a covalent compound, but it contains polar N-H and O-H bonds. This would make the molecule interact well with polar water molecules, and make it likely that it would be soluble. c) Pentane (C 5 H 12 ) has no bonds of significant polarity, so it would not be expected to be soluble in the polar solvent water. d) Ethylene glycol (HOCH 2 CH 2 OH) molecules contain polar O-H bonds, similar to water, so it would be expected to be soluble. 4.15 a) Each mole of Rb 2 SO 4 dissolves in water to form 2 moles of Rb + ions and 1 mole of SO 4 2– ions, or a total of 3 moles of ions. () 24 3mo lions 0.805 mol Rb SO 1molRb SO ⎛⎞ ⎜⎟ ⎝⎠ = 2.415 = 2.42 mol of ions b) Each mole of Ca(NO 3 ) 2 forms 1 mole of calcium ions (Ca 2+ ) and 2 moles of nitrate ions (NO 3 ), or a total of 3 moles of ions.
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chapter4_1hw - CHAPTER 4 THE MAJOR CLASSES OF CHEMICAL...

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