it reacts with water. it forms OH- by reaction.
It maintains its original hue. When placed in a base (metal oxide+water), it will turn blue.
Nothing noteworthy happens if mentos are put in tap water; they simply dissolve slowly.
water will put out fire
It will make the water white
It either floats or sinks...put the marbles in water to test them!
nothing
It will get wet.
it floats
If they are put together in equal parts, then they will equalize the PH level.
They die
the celery take in the water
When you put a gummy bear in tap water it grows.