
Interpretation:
The term insoluble is to be explained.
Concept introduction:
Most of the substances around us can be grouped into different categories based on two properties: solubility and conductivity of electricity. These properties are directly related to the intermolecular force of attraction between the molecules.

Answer to Problem 1E
Those substances that do not dissolve in water or other solvents are said to be insoluble. Example: lead is insoluble in water.
Explanation of Solution
Solubility is a general property by which one can sort substances into two categories: soluble and insoluble. Those which can dissolve in water/solvent and form aqueous solution are called soluble and those which do not dissolve in water/solvent are called insoluble.
For example, sugar is soluble but sand is insoluble.
Many substances can be sorted into one of two categories based on whether they dissolve in water/solvent. Not only solids but liquids and gases can also dissolve in water.
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