Experiment N1 Gold rain
First step: synthesis Pb(NO3)2
Reaction:3Pb + 8HNO3 = 3Pb(NO3)2 + 2NO↑ + 4H2O
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
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