3 контрольна робота з хімії 7 клас ІІ семестр

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    ___P2O5+____K2O=>_____K3PO4
    ___CaCO3=>____CaO+_____CO2
    ___Zn+___O2=>___ZnO
    ___HgO=>___Hg+___O2
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    N2O3
    NO
    N2O
    NO2
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    N2O5
    SeO3
    Rb2O
    P2O3
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