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Carbon dioxide (CO2 ), sulfur dioxide (SO2) and nitrogen dioxide (NO2) all dissolve in water forming acid solutions. To detect that a non-metal oxide gas is acidic with indicator paper, the paper must be moist. Moisture enables the gas to dissolve and form the acid that produces hydrogen ions...

hey, how we did that in class was we modelled it with toothpicks and playdough. Construct the shape of ethene, and break the double bonds and add on the OH group and everything like explained before, but u build it with the tooth picks as the bonds, and small pieces of playdough as hydrogens...