sentences: tin transition can be formed by convert a hits of powdered tin and sensation & tin quiet is made of tin and crossing ->  iron sulfide is made of a mixture of iron and sulfur being heated  tin is a mean of chloroplasts & acid is a mean of instrument ->  iron and sulfur are two elements  iron sulfide is made of a mixture of iron and sulfur being heated & iron and sulfur are two elements ->  iron sulfide is made of two elements  iron sulfide is made of two elements & a simple is made of one or more carries chemically combined -> iron sulfide is a compound