Asked by Stephanie

I just took my quiz and I'm confused because I got it wrong.

It asked which one is not a pure substance?
A. Ammonia
B. Steam
C. Gasoline
D. Iodine Crystals

I was running out of time and I chose Ammonia and I see it was a pure substance but I see the other three are too. I'm confused. Thank you
Answered by oobleck
gasoline is a complex mixture of various hydrocarbons.
All the others consist of only one type of molecule or atom
Answered by Stephanie
Okay thank you so much. I was reading somewhere it was considered a pure substance
Answered by DrBob222
It is true that some math/chemistry problems involving gasoline will say assume gasoline is octane, C8H18; however, it really is a complex mixture of hydrocarbons. In fact the composition changes with the season and the altitude of the area in which it is sold/used.
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