What is the most obvious sign of a chemical change in this reaction.
a. a gas was produced.
b. the powder mixed with the water.
c. there was a change in temperature. eliminate
d. the powder dissolved in the water.?

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.