* Tap water is a mixture: It contains a variety of substances, including water (H₂O), dissolved minerals (like calcium, magnesium, and sodium), and sometimes chlorine or fluoride added for sanitation.

* Molecular compounds are formed by covalent bonds: Covalent bonds involve the sharing of electrons between atoms. Water (H₂O) is a molecular compound because it's formed by covalent bonds between hydrogen and oxygen atoms.

* Tap water is a heterogeneous mixture: The different components of tap water are not evenly distributed and can vary depending on the source.

In short, tap water is a mixture of different substances, including the molecular compound water (H₂O).