![]() The forward reaction removes water from or dehydrates the crystal, but we can also go in the reverse direction when we add the water back in. ![]() We can call this reaction a reversible dehydration reaction. In this case, the reverse reaction is where the water recombines with the solid copper sulfate to form the initial reactant, the hydrated crystal. The reverse reaction is the one that goes in the other direction from right to left, where the products recombine to form the reactants. In this case, it takes the reactant, a hydrated crystal, and separates it into an ionic compound and liquid water. In a reversible reaction, the forward reaction is the one that proceeds from left to right. In other words, it absorbs heat from the surroundings. We are told that the forward reaction is endothermic. This question is asking about a reversible reaction as indicated by the double-headed arrow in the chemical equation. Or (E) the reverse reaction has a lesser overall energy change. (D) The reverse reaction has a greater overall energy change. (C) The reverse reaction absorbs heat from the surroundings. (B) The reverse reaction is also endothermic. What must be true about the reverse reaction? (A) The reverse reaction is exothermic. Hydrated CuSO4 reversibly produces solid CuSO4 and liquid water. In the following chemical reaction, the forward reaction is endothermic.
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