The class of substances in Model 2 which would dissolve well in water is referred to as polar substances due to their high affinity for water.
This is defined as a type of molecule which has a positive and negative charge present in its structure. They are also formed when two atoms do not share electrons equally in a covalent bond.
This type of substances are held together by polar covalent bonds and have high affinity for water which is why it dissolves well in it. Examples include the following:
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