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Yes, most have two slots. If it is two 4GB then you'd by two 8GB to get your 16GB. (I'm guessing you could sell the original two 4GB banks afterwards) You can check here: http://support.apple.com/en-us/HT201165 Or by clicking About This Mac | System Report

It depends on the exact model - the 8GB could be comprised of two 4GB banks.

Yes. A magic mouse even It's all in the screen bit Again, it's all in the screen bit.