Just going to Apple.com would answer one part of your question, as it clearly shows a black iPhone 5 with a black bezel smack bang on the front page.
Then once you click into the main iPhone page, you can either scroll down to see a white iPhone 5 with a silver bezel, or click into Design (that sounds reasonable, to click into Design to see the design of the phone, right?) and scroll down, where you will see a white iPhone 5 with a silver bezel.
As for the color of the back: Clicking into the main iPhone page shows you a black iPhone 5 with a black aluminum back. Then clicking into Design and scrolling down, you will see the silver aluminum back of the white iPhone 5, clear as day.
'so', you should have been able to find this information within 30 seconds by heading into the Apple website. You could have googled 'white iPhone 5 back' and gotten your answer even quicker. 'so', you should learn to Google, or learn common sense and go to the manufacturer's website for information, and only post if you can't find what you want there.