In chemistry, solubility is the ability of a substance, the solute, to form a solution with another substance, the solvent.- Solubility
Iron(II) sulfide has its own distinct properties such as melting point and solubility, and the two elements cannot be separated using normal mechanical processes; a magnet will be unable to recover the iron, since there is no metallic iron present in the compound.- Chemical substance
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A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.
It usually takes place when the concentration of dissolved ions exceeds the solubility limit and forms an insoluble salt.