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Although a compound is a pure substance, it contains two or more elements combined chemically. Select each of the following that is an example of a mixture of pure elements and does not include one or more chemical compounds. Cl iron {III} oxide {Fe-203}, which is known as rust a combination of iron (Fe) and copper {Cu} shavings .u' iHi hydrogen peroxide {H202}, a common antiseptic carbon dioxide (4:02} gas and water vapor {H20} in the air after a forest fire ii! silicon dioxide {SizL a common chemical constituent of sand hydrogen {H2} and oxygen {02} gases added; one after the othen to the combustion chamber of a rocket 5:. oxygen {02), nitrogen {N2} and argon (Ar) gases as they occur naturally in the Earth's atmosphere