
Interpretation: Grease doesn’t dissolve in water easily by itself has to be explained.
Concept introduction: Solution is mixture in which all components are uniformly distributed. Any solution has 2 substances: solute and solvent. For formation of solution compatibility between solute and solvent is required. Example is salt solution and sugar solution.

Answer to Problem 4RQ
Since like dissolves like, therefore, grease which is a non polar molecule doesn’t dissolve itself in water as water has polar characteristics.
Explanation of Solution
Polar solvents like water can only dissolve polar solutes like
So basically water dissolves polar solvents because it results into solute-solvent interactions similar to those present in pure water.
Similarly non polar solvents dissolve non polar solutes. Grease is a non polar molecule whereas water is polar in nature, so water doesn’t dissolve it. Some dry cleaning solvent which is non polar in nature is required to dissolve grease stain in it.
Since like dissolves like, therefore, grease which is a non polar molecule doesn’t dissolve itself in water as water has polar characteristics.
Chapter 15 Solutions
World of Chemistry, 3rd edition
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