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
            
        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
Answers
                    Answered by
            oobleck
            
    gasoline is a complex mixture of various hydrocarbons.
All the others consist of only one type of molecule or atom
    
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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