A 15.0 g sample of a white, solid substance, is heated in the presence of air. The solid remaining after heating has a mass of 12.6 g. The reaction that took place must have been a/an:

Question

Quizplus · Accepted Answer

The mass decrease from 15.0 g to 12.6 g suggests that part of the solid reacted with something in the air (likely oxygen) and was released as a gas, indicating a decomposition reaction where the original compound breaks down into simpler substances.

A 150 G Sample of a White, Solid Substance, Is Heated