An alloy?
well, not metal+metal, but for the other 2 you'd have to specify, because water+metal=good conductivity & just water or another liquid = good conductivity. now stone, it is a horrible conductor.
Metal+Acid=Salt+Hydrogen
hydrogen gas
It is a decomposition reaction
Iron (Fe)
The answer is: "TIARA"
Metal oxide + Water --> Metal hydroxide
An acid plus a metal produces a salt of the acid plus Hydrogen gas. 2HCl + 2Na ---> 2NaCl + H2
metal plus energy
You get the metal hydroxide instead of the metal oxide. This happens with extremely reactive metals such as sodium. 2Na + 2H2O --> 2NaOH +H2
A water plus a metal makes a metal hydroxide and hydrogen gas For example, Potassium + Water ---> Potassium Hyroxide + Water 2K + 2H20 ---> 2KOH + H2
This alkali metal is lithium (Li).