Assume that the test tube shown started out having 10.00
g of mercury(II) oxide. After
heating the test tube briefly, you
find 1.35 g mercury(II) oxide left
and 8.00 g of liquid mercury.
How much oxygen gas was
produced by the chemical
reaction? Show your work.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

i'm pretty sure its b i might be wrong though!