[Hemidol]

I'm trying to predict reactions here based of chemical rules, please tell me if these chemical equations are correct:

Mg(s) + 2 HCl(aq) -> MgCl2(aq) + H2(g)

Mg(s) + 4 HNO3(aq) -> Mg(NO3)2(aq) + 2 NO2(g) + 2 H2O(l)

Mg(s) + 2H2SO4(aq) -> MgSO4(aq) + SO2(g) + 2H2O(l)

And also...


I had to do an experiment where I added 5 drops of 0.3M FeCl3 to a test tube with a dropper of H2O2 and test the flamability. I want to write an equation for this reaction now... I know that FeCl3 is a catalyst so would I write:

2H2O2(aq) -> O2(g) + 2H2O(l)

with FeCl3 over the arrow? Or...
FeCl3(aq) + H2O2(aq) -> FeCl3(aq) + O2(g) + H2O(l) ?


Thanks for reading.

[AWK]

Mg(s) + 4 HNO3(aq) -> Mg(NO3)2(aq) + 2 NO2(g) + 2 H2O(l)

Hydrogen evolved is a poweful reductor
Mg(s) + HNO₃(aq) -> Mg(NO₃)₂(aq) + NH₄NO₃(aq)+ H2O(l)

Should be

Mg(s) + H2SO4(aq) -> MgSO4(aq) + + H₂(g)

my fault

FeCl3(aq) + H2O2(aq) -> FeCl3(aq) + O2(g) + H2O(l)

catalyst does not take place in the reaction

[Hemidol]

Mg(s) + 4 HNO3(aq) -> Mg(NO3)2(aq) + 2 NO2(g) + 2 H2O(l)

Hydrogen evolved is a poweful reductor
Mg(s) + HNO₃(aq) -> Mg(NO₃)₂(aq) + NH₄NO₃(aq)+ H2O(l)

Should be

Mg(s) + H2SO4(aq) -> MgSO4(aq) + + H(g)

FeCl3(aq) + H2O2(aq) -> FeCl3(aq) + O2(g) + H2O(l)

catalyst does not take place in the reaction

In the first equation, no gas will be liberated? Why not? And NO2 gas will not appear in the second one at all? That seems strange to me.

With regards to the last one, thus it would just be :

H2O2 -> O2(g) + H2O(l) with the catalyst written over the -> arrow, correct?

[AWK]

H2O2 -> O2(g) + H2O(l) with the catalyst written over the -> arrow, correct?

Yes, correct