Question 1.12 - Chemistry: Molecular Nature Of Matter And Change

Question

One important observation that supporters of the phlogiston theory had trouble explaining was that the calyx of a metal weighs more than the metal itself. Why was that observation important? How did the phlogistonist’s respond?

Step-by-Step Solution

Answer

Answer

Supporters of the phlogiston theory claimed that phlogistons have a negative mass, resulting in mass loss.

Troubles faced by phlogiston theory supporters

Supporters of the phlogiston theory were troubled by the increase in mass after burning because theoretically when something leaves the matter, it should lose weight rather than gain it. So it’s illogical that phlogiston leaves the matter when it’s burned.

Importance of the observation

Hence, supporters of the phlogiston theory claimed that phlogistons have a negative mass, resulting in mass loss. It did not follow the law of conservation of mass.