* Mixtures vs. Compounds: A mixture is a combination of two or more substances where each substance retains its own properties. The proportions of the substances in a mixture can vary. A compound, on the other hand, is a pure substance formed when two or more elements chemically combine in a fixed ratio.
* Examples:
* Iron filings and sulfur powder: You can mix these in any ratio you like. It will still be a mixture, and the iron and sulfur will retain their individual properties.
* Iron sulfide (FeS): This is a compound formed by the chemical reaction of iron and sulfur. It always has a fixed ratio of one iron atom to one sulfur atom.
In summary: Mixtures allow for variable proportions of their components, while compounds have a fixed ratio of their elements.
