Which of the following equations is not balanced? O 2NaHCO3 + H2SO4 -> Na2SO4 + 2H2O + CO2

O 2NO + O2 -> 2NO2

O Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag

O 2Mg + O2 -> 2MgO

O CaCO3 -> CaO + CO2

When you perform this reaction, what could remain at the end of the reaction? check all that apply. excess reactant aqueous copper chloride excess reactant aluminum oxygen product solid copper carbon dioxide product aqueous aluminum chloride water