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