Dissolving means to mix two substances it together to create one solution. The solute combines with the solvent so the two substances become one (i.e. sugar and water)There is a rule that goes along with this, and that is "like dissolves like":
"Like dissolves like" means that a solvent dissolves a solute with the same polarity; therefore a polar solvent will only dissolve with a polar solute and a non polar solvent will only dissolve with a non polar solute. In the example on the left, the oil and water do not dissolve because water is polar, but oil is non polar, therefore they will eventually separate even if you try and mix them.
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