Question

Three different substances are placed in three separate, identical, open dishes and weighed. They are each heated for a period of time. They are then cooled and weighed. The first dish is found to have lost mass, the second dish is found to have gained mass, and the third dish is found to have exactly the same mass it had before heating.

How do you explain these results, knowing that mass is conserved in chemical reactions?

Answer 1

Three different substances are placed in three separate, identcal, open dishes and weighed. They are each heated for a period of time. They are then cooled and weighed.

*the first dish is found to have lost mass

*the second dish is found to have gained mass

*the third dish is found to have exactly the same mass it had before heating

How do you explain these results, knowing that mass is conserved in chemical reactions?