Pure gold is homogeneous because it has a uniform composition throughout. This means that its physical and chemical properties are consistent in every part of the material. In contrast, heterogeneous materials have distinct, different components that can often be visually distinguished.
homogeneous
Pure air is homogeneous because all components are completely miscible.
Since gold is an element and therefore a pure substance it is homogeneous.
homogeneous
CO2 is a pure substance and so is homogeneous. Hint: if it has a chemical formula then it is a pure substance.
Liquid gold-homogeneous Solid-heterogenous
Pure iron is homogeneous.
homogeneous
pure air is homogeneous but dusty air is heterogeneous
Pure air is homogeneous because all components are completely miscible.
Liquid gold-homogeneous Solid-heterogenous
Since gold is an element and therefore a pure substance it is homogeneous.
Wine is a homogeneous solution.
Gold is a pure element, not a mixture of any kind.White gold (alloy with nickel, manganese, or palladium) is a homogeneous mixture because you can't see the separate substances that are in it. Therefore it is a homogeneous mixture.
water is pure so is homogeneous ice is pure so is homogeneous oil is pure so is homogeneous
Silver is not a homogeneous mixture or a heterogeneous mixture, it is a pure element. Silver does appear in homogeneous mixtures and heterogeneous mixtures such as sterling silver and silver nitrate.
It is a pure substance.