Unit 4: Chapter 9: End of Chapter Problems – Flashcards
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9.4: Although water is classified as a nonelectrolyte, in reality it is an extremely weak electrolyte and therefore cannot conduct electricity. Nevertheless, it can be dangerous to operate electrical appliances with wet hands. Explain.
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The water could react with the other molecules - dissolving them into aqueous solutions and creating a possibility for a stronger electrolyte to form. Therefore, if the water on your hands were to react with other molecules that could generate electricity if they form strong electrolytes.
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9.5: Identify the species present in aqueous solutions of the following strong electrolytes: (a) LiF (b)NH?NO (c) CaBr? (d) Na?CO?
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(a) Strong (b) Weak (c) (d)
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9.11: Which of the following diagrams best represents the hydration of NaCl when dissolved in water? The Cl? ion is larger in size than the Na? ion. ***Page 349 for picture***
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C
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9.12: Identify each of the following substances as a strong electrolyte, weak electrolyte, or nonelectrolyte: (a) H?O (b)KCl (c) HNO? (d) HC?H?O? (e) C??H??O??
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(a) EXTREMELY weak (b) Strong (c) (d) (e)
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9.13: Identify each of the following substances as a strong electrolyte, weak electrolyte, or nonelectrolyte: (a) Ba(NO?)? (b) Ne (c) NH? (d) NaOH (e) HF
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(a) (b) (c) (d) (e) Strong
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9.20: Characterize the following compounds as soluble or insoluble in water: (a) CaCO? (b)ZnSO? (c) Hg(NO?)? (d) HgSO? (e) NH?ClO?
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(a)Insoluble (b)Soluble (c)Soluble (d)Insoluble (e)Soluble
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9.21: Characterize the following compounds as soluble or insoluble in water: (a) Ca?(PO?)? (b)Mn(OH) (c)AgClO? (d)K?S (e)Pb?(PO?)?
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(a)Insoluble (b)Insoluble (c)Soluble (d)Soluble (e)Insoluble
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9.15: (a) What is the difference between a molecular equation and an ionic equation? (b) Between an ionic equation and a net ionic equation? (c) What is the advantage of writing net ionic equations?
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(a) Molecular Equation: All compounds represented by chemical formulas Ionic Equation: Compounds represented by their ions (b) Ionic Equation: All ions represented Net Ionic Equation: Only active ions represented (no spectator ions in equation) (c) With Net Ionic Equations, you are able to isolate the action of the reaction.
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9.23: Write ionic and net ionic equations for the following reactions: (a) AgNO?(aq) + Na?SO?(aq) ? (b) BaCl?(aq) + ZnSO?(aq) ? (c) (NH?)?CO?(aq) + CaCl?(aq) ?
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(a) 2Ag?(aq) + SO?²?(aq) ? Ag?SO? (b) (c)
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9.25: Which of the following processes will likely result in a precipitation reaction? (a) Mixing a NaNO? solution with a CuSO? solution (b) Mixing a BaCl? with a K?SO? solution (c) Mixing a AgNO? solution with a LiC?H?O? solution. Write a net ionic equation for each combination.
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(a) Not a Precipitation Reaction No net ionic equation (b) (c)
