Answer:
Learn from their experiment and know the possible results from trial and error
The upper surface of the zone of saturation is called the water table
I would say CuSO4 or Copper Sulfate, as option 1 is Methane and would create a fire so heat, and the last one is Sugar which doesn't conduct electricity. And C6H6 I believe is not soluble in water.<span />
More detail? If you can send it.
