Iodide is an ion, not s a substance int its own right. It is however a component of many pure substances.
Iodine, the element from which the iodide ion is derived, is a pure substance.
This is an ionic compound and if it is not mixed in solution or found with other substances, it is pure.
Lithium iodide is a chemical compound, not a mixture.
pure substance, propanone
To a chemist, there are many kinds of salts. It would be more precise to say that sodium chloride is a pure substance. Table salt usually involves two different chemicals, mostly sodium chloride, but also some potassium iodide added as a nutritional supplement.
Table salt is a pure substance. It is combined in such a way that it is uniform and definite in composition.
it is a pure substance.... not
Pure substance
Methane is a pure substance.
A pure substance is the same throughout. When a substance is 100% something it is pure.
Helium is pure as it is on the periodic table.
Silicon is an element. Its symbol is Si.
silicon is a pure substance because it is an element and as we know an element is a pure substance