Part C. Consider the diagram. The red spheres represent the anion and the yellow spheres the cation. Which of the following combinations of reactants could the diagram represent?
A. Pb2+(aq) + 2I−(aq) →
B. 2Ag+(aq) + S2−(aq) →
C. Mg2+(aq) + 2Cl−(aq) →
D. 2NH4+(aq) + SO42−(aq) →
Reactions in water solution can be classified based on the driving force that converts reactants to product. The three classes are precipitation reactions, acid-base neutralization reactions, and oxidation-reduction reactions.
• In precipitation reactions a solid product forms from aqueous reactants. The product can be predicted by using solubility rules.
• In acid-base neutralization reactions an acid (proton donor) reacts with a base (proton acceptor) to form an ionic salt and sometimes water. You can recognize this type of reaction by the presence of an acid and base in the reactants.
• In oxidation-reduction reactions (or redox for short) electrons are transferred between reactants. So you will always see changes in oxidation number within this type of reaction.
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