The two half equations for this reaction are: Ca -> Ca 2+ + 2e - (this reaction shows oxidation). 2Ca + O 2 2CaO This reaction can also be classified as synthesis (combination) reaction Single Replacement (Single Displacement) – one element replaces similar element in compound For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. Thus, as Ca is oxidized while O is reduced and this is a redox reaction. It is a redox reaction (reduction and oxidation both occur) On the reactants side, the oxidation states of both Ca and O2 are 0. In 2Ca, its oxidaton state is 0 and after the reaction it is increased to +2 which forms a bong with oxygen ion. B) 2Ca + O2 → 2CaO It is combination reaction as two reactants react to form a single product. 2Ca (g) + O 2 (g) -> 2CaO (s), . On the products side, the oxidation state of Ca is +2 while that of oxygen is -2. where heat energy is supplied to split calcium carbonate into calcium oxide and carbon dioxide. Picture of reaction: Сoding to search: 2 Ca + O2 cnd [ temp ] = 2 CaO. For this, we need to identify their oxidation numbers. The amount of oxygen present and the temperature determine whether the reaction is complete or incomplete. How To Balance Equations Calcium undergoes oxidation reaction to form Calcium oxide(quick lime). The reaction of calcium with oxygen, which is expressed by the equation 2Ca + O2 --> 2CaO is a synthesis reaction. Half Reactions 2 Ca (s) + O2 (g) 2CaO (s) Step 1: The oxidation half-reaction shows electrons being lost by an element (electrons are In this reaction, calcium is being oxidised. You can use parenthesis or brackets []. Approved by eNotes Editorial Team Posted on October 10, 2011 at 9:46 PM Compound states [like (s) (aq) or (g)] are not required. Classify these elements by whether they get oxidized or reduced in the reactions shown here: (Ech element A) 2Ca(s)+O2(g)→2CaO(s) B) F2(g) + 2Li(s) ------> 2LiF Identify the oxidizing agent and the reducing agent in each reaction below. Thermodynamic properties of substances The solubility of the substances Periodic table of elements. However, this is not a precipitation reaction. CaH2 + O2 = CaO + H2O (300-400° C). A) CaCO3 → CaO + CO2 It is a Thermal decomposition reaction. Methods for preparation of calcium oxide: 2Ca + O2 = 2CaO (above 300° C, burning on air). and O 2 + 4e - -> 2O 2-(this reaction shows reduction) Therefore, you can conclude that this reaction is a redox reaction because it involves both reduction and oxidation. 2Ca + O 2 2CaO [ Check the balance ] ... Find another reaction. Equation: 2Ca + O_2 --> 2CaO Consider the following reaction. Our channel. Element General form: A + O 2 AO ex. 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