Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only. But elements in Group IIA can't form +4 ions. When CO2 is passed through an aqueous solution of BaO2, BaCO3 is precipitated and H2O2 is formed.BaO2 + CO2 + H2O → BaCO3 ↓ +H2O2H2O2 can also be prepared by reaction of H2SO4 with hydrated barium peroxide.BaO2.8H2O + H2SO4 → BaSO4 + 8H2O + H2O2 This compound must be barium peroxide, [Ba2+][O22-]. It is sometimes used in pyrotechnics to produce a … Methods for preparation of barium peroxide: 3Ba + 2O2 = 2BaO + BaO2 (to 500° C, burning on air), 2Ba + O2 = 2BaO (above 800° C). The oxidation number of barium in barium peroxide and barium oxide remains the same, which is + 2. The oxidation number of a free element is always 0. Excessive quantities of barium oxide may lead to death. The alkali metals (group I) always have an oxidation number of +1. In barium peroxide, it is − 1, whereas in barium oxide, it is − 2 and in oxygen, it is 0. Barium oxide, BaO, baria, is a white hygroscopic non-flammable compound.It has a cubic structure and is used in cathode ray tubes, crown glass, and catalysts.It is harmful to human skin and if swallowed in large quantity causes irritation. Barium therefore is +2 and oxygen is -1. The oxidation number of a monatomic ion equals the charge of the ion. Printed in Great Britain TECHNICAL NOTE Energy storage using the reversible oxidation of barium oxide R. G. BOWREY and J. JUTSEN Department of Chemical Engineering, University of New South Wales Kensington, 2033, Australia (Received 21 February 1978; revision accepted 18 July 1978) 1. Barium is a soft silver alkaline earth metal with symbol Ba and atomic number 56. Rules for assigning oxidation numbers. The barium peroxide-based redox cycle was proposed in the late 1970s as a thermochemical energy storage system. , Barium oxide is made by heating barium carbonate. If the oxidation number of the oxygen in BaO2 were -2, the oxidation number of the barium would have to be +4. Barium Carbonate is BaCO3 and the oxidation numbers are +2 for barium, +4 for carbon and -2 for each oxygen. Barium has a density of 3.51 g/cm 3. 2BaO + O2 = 2BaO2 (to 500° C). Barium exhibits oxidation states of +2 and +1, out of which +2 is the stable one. In this paper, we have revisited the use of reduction-oxidation reactions of the BaO2/BaO system for thermochemical heat storage at high temperatures. Oxidation Number of Barium. Barium compounds are added to fireworks to impart a green color. The oxidation number of oxygen changes. It is highly reactive to chemicals. In Figure 1B, we show temperature-dependent Gibbs reaction energies, ΔGrxn, for the formation of YBCO with either BaO2 or BaCO3 as the barium source. Fluorine in compounds is always assigned an oxidation number of -1. Since then, very little attention has been paid to such redox couples. The complete peroxidation of BaO to BaO2 occurs at moderate temperatures but the increased entropy of the O2 molecule at high temperatures means that BaO2 decomposes to O2 and BaO at 1175K. For each compound, a formal oxidation number for barium is given, but the usefulness of this number is limited for p-block elements in particular. ... Is BaO2 the formula equation for barium oxide?