Have you ever noticed that after adding a web part – any web part - to the page, we lose the ribbon and the “list Tools” tab.
Well, I wracked my tired and only semi-aware brain, tore my thinning hair, bit my nails and even “googled” it to no avail.

A little serendipity helps a great deal! I just happened to click in the original list web part (not the added web part) and voila, as if by magic, the tab and ribbon re-appeared!

That’s All Folks