Two sealed containers each hold particles represented symbolically below (all…
CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties
Problem
Two sealed containers each hold particles represented symbolically below (all particles are in the gas phase).
• Container X: every particle is a diatomic species of identical mass and shape.
• Container Y: half the particles are one type of diatomic molecule; the other half are a different diatomic molecule that does not react with the first.
Which statement correctly classifies the contents of the containers?
(a) Both containers hold pure substances because each contains only gaseous molecules.
(b) Container X holds a pure substance, and Container Y holds a mixture because two different molecular species are present in Y.
(c) Container X holds a mixture, and Container Y holds a pure substance because the molecules in X consist of two atoms.
(d) Both containers hold pure substances because a mixture would require the components to be able to react chemically, and the two molecular species in Y do not react.