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kralill
@kralill
October 2021
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а) 2Mg + O2 (стрелка) 2MgOб) 4Na + H2O (стрелка) 2NaH + Na2O
в) Cu + H2SO4 (стрелка) CuSO4 + H2(стрелка вверх)
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dubes
2Mg+O2=2MgO
Mg(0)-2e=Mg(+2)
O2+4e=2O(-2)
4Na+H2O=2NaH+Na2O
Na(0) -1e=Na(+1)
H(+1)+2e=H(-1)
Cu+H2SO4=CuSO4+H2
Cu(0)-2e=Cu(+2)
2H(+1)+2e=H2(0)
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kralill
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Answers & Comments
Mg(0)-2e=Mg(+2)
O2+4e=2O(-2)
4Na+H2O=2NaH+Na2O
Na(0) -1e=Na(+1)
H(+1)+2e=H(-1)
Cu+H2SO4=CuSO4+H2
Cu(0)-2e=Cu(+2)
2H(+1)+2e=H2(0)