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Right of Reply... There's also 2,2-dichloro propane as well. This now gives a total of 4: 1,1-dichloro propane 1,2-dichloro propane 1,3-dichloro propane 2,2-dichloro propane Perhaps this is what the answer meant but 2,3-dichloro propane, as well as 3,3- dichloro propane, are still incorrect...

There is but your mathematical skills need to be good in determining the number of permutations possible: Eg simple hydrocarbons such as methane, ethane and propane obviously dont have isomers, but butane has 2, pentane 3, hexane 6...and C20H42 would have 366 319 isomers! If other atoms are...

There are two types of Polystyrene; expanded and extruded. Expanded polysterene is white and is commonly used as a cup for hot drinks and as cushion packaging (the stuff used to package tv's and other electrical appliances). Interestingly many Sydney councils do not recycle polystyrene, which is...

This practical would require you to use a spectrometer of sorts so you can actually see the emission spectra produced by the excited ions and get quantifiable data (seeing and determining the various wavelengths of the visible emission spectra lines). The alternative is simply observing the...