A sample of elemental chlorine gas collected from seawater electrolysis consists of…
CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties
Problem
A sample of elemental chlorine gas collected from seawater electrolysis consists of 76 % 35Cl and 24 % 37Cl atoms by number. Which classification and justification are most appropriate?
(a) Chlorine gas is a mixture because it contains different isotopes that could, in theory, be separated physically.
(b) Chlorine gas is a pure substance because isotopes are atoms of the same element and therefore show identical chemical behavior.
(c) Chlorine gas is a heterogeneous mixture because regions enriched in 35Cl differ from regions enriched in 37Cl.
(d) Chlorine gas is a pure compound because Cl2 molecules always contain one 35Cl and one 37Cl atom.