Can somebody help meeeeee?

Question

ok . so we have water in atube then we added Mno subsript 2 . then we closed the tube and then we had a thin stick we light it on . then we turn of and quickly emerssed in the the tube and then it lightes up again . ok i know that Mno is a ctalyst but how come their was more oxygen inside

Answer 1

It sounds like you are talking about the decomposition of hydrogen peroxide, H2O2, solution. It would look like water but is considerably different.

The reaction catalyzed by MnO2 is
2H2O2 ---> 2H2O + O2(g)