We're trying to remove 12x12 ceramic tiles from concrete. It took 2 hours to remove 2 tiles because they used so much glue. How can we remove these tiles? Also, the concrete is very "bumpy" after the removal. How can we prep the conccrete so we can lay laminate flooring?

I have used electric impact guns with wide blade to remove ceramic tile, you can rent it from rental stores. You can also use product sold at your home center to smooth up the concrete, its leveling compound that will fill in the low areas using a trowel.

You can find information about ceramics in here:
קרמיקה (http://www.meir-hamair.co.il)