Question #68168

1 Answer
Apr 11, 2017

Could be anything, like magnesium powder added to dilute acid, or many others.

Explanation:

My bet though, would be on a relatively strong hydrogen peroxide solution H_2O_2(aq), to which manganese dioxide MnO_2 was added. The MnO_2 acts as a catalyst for the following reaction:

2H_2O_2(aq)->2H_2O(l)+O_2(g)

If you want to make sure you could test for the gas being oxygen (glowing splinter).