This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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d) Ionic compounds consist of charged ions. In the solid state, these ions are held in fixed positions within a crystal lattice and are not free to move, so they cannot conduct electricity. When molten or dissolved in an aqueous solution, the ions become mobile and are free to move, allowing them to carry charge and conduct electricity. e) (i) For _19K (Potassium), which has 19 electrons: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 (ii) For _17Cl^- (Chloride ion), which has 17 + 1 = 18 electrons: 1s^2 2s^2 2p^6 3s^2 3p^6 (iii) For _20Ca^2+ (Calcium ion), which has 20 - 2 = 18 electrons: 1s^2 2s^2 2p^6 3s^2 3p^6 f) An alkali is a soluble base that produces hydroxide ions (OH^-) when dissolved in water. Drop the next question.