Under identical conditions, water boils at precisely the same speed as water.
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It does NOT boil faster than water. It has higher boiling point AND lower freezing point. - Antifreeze boils at about 197 c.
A small amount of water will reach it's boiling point sooner than a large amount of water. It will not boil faster.
yes
there are already bubbles in it
No, salt water does not boil faster than water with pepper. Adding salt or pepper to water may change its boiling point slightly, but the difference is not significant enough to affect the time it takes to boil.
possibly...
yes
No, hot water boils faster than cold water because it is already closer to the boiling point.
Coke will boil faster than Gatorade will because Coke has a lower boiling point. This means it will break down faster than Gatorade.
No, water that is covered does not boil faster. Covering the pot can actually trap heat and make the water boil slower.
No. not if they are at the same temperature when you start to heat the water.