What is the correct IUPAC name for Ag₂S?

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.