The example that best illustrates the expression "like dissolves like" is alcohol mixing with water. This phrase suggests that substances with similar polarity will dissolve in each other; both alcohol and water are polar substances, which allows them to mix well.
In contrast:
- Salt (which is ionic) does not mix well with oil (a nonpolar solvent).
- Salt and sugar may both dissolve in water, but they do not illustrate the "like dissolves like" concept because they have different chemical properties (ionic vs. molecular).
- Oil and water do not mix because oil is nonpolar and water is polar.
Therefore, the correct choice is alcohol mixing with water.
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