Hope you can help. My spacebar is missing on my 1st generation but only when I want to type into the address bar of Safari, every where else it seems ok.

Very strange problem. Never heard of this before. Have you updated to the latest iOS? That would be my first suggestion. You may also want to try completely closing Safari and then reopen. You can close down an app by double clicking the home button and then either press and hold on the app till it 'shakes' (iOS6) or simple swipe upwards (iOS7).
If that doesnt work you can try shutting down the entire iPad by pressing and holding the top button for more than 3 seconds. The swipe the red bar that says shut down. Then count to 10 and press and hold the top button again to turn back on the iPad.
If all that fails you can try restoring from an old backup from your computer (backups usually happen when you sync physically with your computer or if you have auto backup over wifi enabled)