Can you freeze chopped zucchini? I know that I can easily freeze shredded zucchini for long-term storage if I stored it in a vacuum sealed freezer bag. However there is a recipe that I really want to make over the winter that requires chopped zucchini. So I am wondering if I can use the same method for freezing zucchini when its chopped like I do when it is shredded. So all I have to do is : 


chop it
fill freezer bag
extract air and seal it


Would this method work? Am I able to freeze chopped zucchini and have it taste the same when I thaw it? Is there a better method? Is there an ideal size for the chopped zucchini?
It is generally recommended to "blanch" vegetables before freezing them. Blanching is heating the vegetables (by boiling or steaming) for a specific number of minutes. You typically follow blanching immediately with an ice-water bath, to stop the cooking process. 

From The National Center for Home Food Preservation: 


  Blanching slows or stops the action of
  enzymes which cause loss of flavor,
  color and texture. Blanching cleanses
  the surface of dirt and organisms,
  brightens the color and helps retard
  loss of vitamins. Blanching also wilts
  or softens vegetables and makes them
  easier to pack.


For vegetable-specific instructions on blanching, see this list.