Re: Is it possible to see impression/clicks graph by single keyword?
I assume you're referring to the built in graphs in Adwords, not a reporting tool...if this is the case then yes I do believe you can accomplish this or quite close to it.
Drill down to the adgroup that contains the keyword your're looking at, click the keywords tab, create a filter by 'keyword text' (using 'is' and your keyword) and set your graph to compare the clicks and impressions.
Hope this helps!
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