The Energy of Chemical Reactions — Test

Question 17 • 26-27 - C - RUSD Chemistry in the Earth System

Which energy changes in the enthalpy of solution are endothermic, and which are exothermic?

Answer

triangle cap h sub solute , triangle cap h sub solvent and triangle cap h sub mix are all is exothermic.

triangle cap h sub solute is exothermic; triangle cap h sub solvent and Δ⁢Hmix are endothermic.

triangle cap h sub solute and triangle cap h sub solvent are endothermic; triangle cap h sub mix is exothermic.

triangle cap h sub solute is endothermic; triangle cap h sub solvent and triangle cap h sub mix are exothermic.

Explanation

Separating solute particles from one another requires energy, so ΔHsolute is endothermic. Separating solvent particles also requires energy, making ΔHsolvent endothermic. When solute and solvent particles mix and form new attractions, energy is released, so ΔHmix is exothermic. Therefore, choice C is correct.

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