Rezolvati pe foaie separata exercitiile de mai jos fara a mai copia si enunturile.
Ca
K,
N
P
C
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Pozitiv, negativ, neutre
Nu contine nici un fel de particula
Numai particule incarcate negativ
Numai particule incarcate neutre
Numai particule incarcate pozitiv
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15g sare de bucatarie si 285g apa.
5g sare de bucatarie si 300g apa
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