Experiment N1 Gold rain

First step: synthesis Pb(NO3)2

Reaction:3Pb + 8HNO3 = 3Pb(NO3)2 + 2NO↑ + 4H2O

Second step:Reaction Pb(NO3)2 with NaIReaction: 2NaI + Pb(NO3)2 = 2NaNO3 + PbI2

Experiment N2 Colored fire

Many substances give fire different colors: K2CO3 - purple

H3BO3- bright greenNa2CO3- yellow

CuSO4 - pale blue

BaCl2 - green

*-Used as fuel C2H5OH. Color can be observed at the bottom of the fire.

Experiment N3Chemical snake or expansion calcium gluconate

Reagents: calcium gluconate (C12H22CaO14)

Experiment N4Chemical algaeReagents: FeCl3, Na2SiO3

Reaction: FeCl3 + Na2SiO3 + H2O = Fe(OH)3 + NaCl + SiO2*nH2O

Experiment N5 Volcano Scheele

Reaction: 14КМnО4 + 3С3Н5(ОН)3 = 7K2CO3 + 14MnO2 + 12H2O + 2CO2