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ChemistryChemistry
3 November, 01:00

A solution is formed when the solute uniformly disperses throughout (or dissolves in) the solvent. The process can be described by three steps:

1. separation of solvent-solvent particles (AKA expanding the solvent),

2. separation of solute-solute particles (AKA expanding the solute), and

3. formation of solute-solvent interactions.

Classify the steps involved in the formation of a solution as being endothermic or exothermic.

A. Step 1 is exothermic, Step 2 is exothermic, Step 3 is endothermic

B. Step 1 is endothermic, Step 2 is endothermic, Step 3 is exothermic

C. Step 1 is endothermic, Step 2 is exothermic, Step 3 is exothermic

D. Step 1 is exothermic, Step 2 is endothermic, Step 3 is exothermic

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Answers (1)
  1. 3 November, 03:20
    0
    B. Step 1 is endothermic, Step 2 is endothermic, Step 3 is exothermic

    Explanation:

    Prior to the formation of a solution, the solvent molecules attract each other as well as the solute molecules. For a dissolution to be effective, those interactions need to be weakened, at the same time that interaction between solute and solvent ought to be established. The formation of solute-solvent interactions is exothermic and provides the energy required to separate solvent-solvent particles and solute-solute particles, being both processes endothermic (the absorbed energy is used to break the interactions).
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