If there's a red blinking light on the dash by the Hazard switch, yes.
If it doesn't have the computer chip in it, it is about $3 to get one cut. One with the chip is about $17.
Yes the key is chipped. You need a pk3 key. You can get them from eBay for around $15 uncut.
Yes
Its a programmable chip inside of the key .
Most 2000 Concordes do have chip keys.
My 92 does have a computer chip in the ignition key.
Your original key is micro chipped and coded, your new key most likely has no chip in it. Car won't start unless the micro chip in the key and the car are programmed to match.
If it has a cover on the key, yes. If it is a steel key no.
no, its not a laser key either
Amazingkeys.com has the 2000 Buick LeSabre Key. It does have the chip in it.
The immobilizer.
yes