During the experiment, the copper was totally burned black and the sulfur became yellow liquid. The process produced water and vapor, because of the hot temperature. The result of this experiment was the increase of the weight due to the oxygen pressure and the broken molecules lost weights.
To clarify the above data, it showed the chemical changes between the initials and the consequences of mass after heated.
The reactants above showed the chemical and physical changes during the experiment.
The above class data demonstrated the total reactant, the total product, and the change of mass of each group. Some changes were extremely small such as Group 16. Each of them had different chemical reactions because of their molecule structures. A great job for this experiment was to remain small changes by doing each step correctly.
In case Group 16, the greatest result of this synthesis, the change of mass did not increase a lot which meant they preserved the law of conservation of mass using copper and sulfur. In case Group 1, the change of mass increased four time of Group 16 so the gap was a great big difference.
It is to identify potential sources of error in the experiment. My average of the mass was 2.53g and the percentage of error was 10.90%. The average (change in mass) of the class was 0.57g and the source of error was 1.99%. The answers might not accurate because there was not exact answer for quantitative chemistry, and we just want to know the approximate figures.