This depends on the specific reaction.
Reactant
Iron(II) sulfide is insoluble in water.
Iron sulfide or ferrous sulfide
This depends on the reaction involved.
Iron sulfide and many other compounds are available from chemical supply companies.
Reactant
The product is iron sulfide.
Reactant.
There is no elemental iron (Fe) involved in this reaction, neither as reactant (iron sulphide -FeS- plus oxygen are) nor as product (iron oxide (FeO) plus sulphur dioxide are)
The chemical equation is:FeS + 2 HCl = FeCl2 + H2S
Sugar can be both a reactant and a product.
Ferrous Sulfide = Iron (III) Sulfide Both -> Fe2S3
The most common ones are iron(II) sulfide and iron(III) sulfide.
Iron sulfide is an ionic compound.
Sun is a star, not reactant or product.
reactant
Iron sulfide or ferrous sulfide