Mixture of Iron and Sulfur
* Individual components retain their properties: Iron filings (grey, magnetic) and sulfur powder (yellow, non-magnetic) can be easily identified and separated.
* No chemical reaction: The iron and sulfur are simply mixed together, not chemically bonded.
* Variable composition: You can mix different ratios of iron and sulfur.
* Can be separated by physical means: You can use a magnet to separate the iron from the sulfur.
Iron Sulfide (FeS)
* New substance with different properties: When iron and sulfur react, they form a black solid with a different melting point, density, and magnetic properties than either iron or sulfur alone.
* Chemical reaction: Iron and sulfur combine chemically through a process called a chemical reaction.
* Fixed composition: Iron sulfide always has a specific ratio of iron to sulfur atoms.
* Cannot be separated by physical means: You cannot use a magnet to separate the iron from the sulfur in iron sulfide.
In summary:
A mixture of iron and sulfur is simply two substances existing together, while iron sulfide is a new substance formed by the chemical reaction of iron and sulfur.
