a sample of the compound gold bromide and yellow crystalline solid was heated& made a shiny metal and red gas.

Question

What most likely occured?
A.the Gold bromide released light&energy, but remained unchanged.
B. The heat caused the gold bromide to form a new compound
C. The gold bromide decomposed into bromine and gold.
D.the gold bromide reacted with the test tube to form a new element.

Answer 1

C.

Formation of a gas indicates a chemical reaction, excluding A and suggesting C. Although B is hypothetically possible, bromine is a red gas and gold is a shiny metal. D would require nuclear fusion or fission