Heterogeneous vs. homogeneous refers to solutions. Pure water is a compound which is bound together chemically. Solutions are combined physically. So technically it is neither.
water is pure so is homogeneous ice is pure so is homogeneous oil is pure so is homogeneous
Pure water (H2O) is a chemical compound; if the water is impure may be a homogeneous or heterogeneous mixture.
Homogeneous mixture
Pure iron is homogeneous.
Pure water is a homogeneous mixture because it has a uniform composition throughout, with the same proportions of water molecules.
homogeneous
pure air is homogeneous but dusty air is heterogeneous
Pure air is homogeneous because all components are completely miscible.
They are homogeneous. But they are not a mixture, so they are a pure substance
Wine is a homogeneous solution.
It is a pure substance.
Tap water is a homogeneous mixture, which means it has a uniform composition throughout. It is a mixture of water molecules along with dissolved minerals, gases, and other compounds, but these components are evenly distributed.