A group of students uses the following method to investigate the change in mass that takes place when metal M combines with sulfur to form a metal sulfide. step 1 Weigh a clean crucible and lid using a balance. Record the mass. step 2 Place a coiled length of metal wire into the crucible and weigh the crucible, lid and wire. step 3 Cover the metal wire in the crucible with a large quantity of powdered sulfur and replace the lid. step 4 Heat the crucible in a fume hood until the crucible glows red. Continue heating strongly until no more sulfur can be seen. step 5 Allow the apparatus to cool and weigh the crucible, lid and residue.