AimThe aim of this investigation is to identify the unknown solid.Hypothesis:I predict that if we can identify the unknown solid, by finding its melting point in a water bath, and match it with the periodic table.Variable:Amount of the unknown substanceHeat given to the water bathOutput:Temperature of the unknown substanceMethod:Equipment:* Bunsen burner* Tripod* Unknown solid* Beaker* Stopwatch* Boiling tube* Sta ...view middle of the document...
Since this is group work, and to make it fair, we take turns recording the temperature every 30 seconds or looking at the stopwatch. By changing our shifts every 5 minutes, this will make us to have a fair chance of working. We than turned of the fire once the solid melted.Time Temp0:30 211 221:30 222 222:30 233 243:30 254 274:30 295 315:30 336 356:30 377 397:30 448 498:30 519 539:30 5410 5710:30 5911 6311:30 6912 8012:30 86Discussion and ConclusionI think the unknown substance is naphthalene, for it has the highest melting point, matching the data we collected. I think we have been doing well on it, without doing anything things wrong. Also we should have turned the fire down a little bit, for the temperature suddenly rised from 80 to 86 degrees.Modifications to Original Plan:I got an idea of doing it in turns during the setup for the investigation. Since Sam agrees in my idea, we changed our way of working.Evaluation:Our method used here was fine, if we have turned the fire smaller, there, it may be slow, but the information is more accurate.
