according to the defination of pure substances, a pure substance is made of only 1 kind of atoms. So in water there are hydrogen and oxygen molecules.So is it pure??
is water pure in terms of chemistry?
pure substances are those which are same throughout. If its element then it has 1 type of atoms, ( here the same atoms combine to form a molecule eg; H2)if its a compound its 1 type of molecules i.e different atoms combined in a fixed ratio eg; H2O. In water you find 2 H and 1 O forming a molecule and its throughout the same H2O molecules. suppose in this some other atoms or molecules added not in any particular ratio then its mixture or impure.