CaCO3 = CaO + CO2 (900-1200° C). Element General form: A + O 2 AO ex. The two half equations for this reaction are: Ca -> Ca 2+ + 2e - (this reaction shows oxidation). CaH2 + O2 = CaO + H2O (300-400° C). 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 Compound states [like (s) (aq) or (g)] are not required. Methods for preparation of calcium oxide: 2Ca + O2 = 2CaO (above 300° C, burning on air). In this reaction, calcium is being oxidised. On the products side, the oxidation state of Ca is +2 while that of oxygen is -2. Replace immutable groups in compounds to avoid ambiguity. Half Reactions 2 Ca (s) + O2 (g) 2CaO (s) Step 1: The oxidation half-reaction shows electrons being lost by an element (electrons are Thus, as Ca is oxidized while O is reduced and this is a redox reaction. where heat energy is supplied to split calcium carbonate into calcium oxide and carbon dioxide. B) 2Ca + O2 → 2CaO It is combination reaction as two reactants react to form a single product. 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. Approved by eNotes Editorial Team Posted on October 10, 2011 at 9:46 PM View Notes - Solubility from CHM 1101 at University of Ottawa. How To Balance Equations Calcium undergoes oxidation reaction to form Calcium oxide(quick lime). Consider the following reaction. 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. 2Ca + O 2 2CaO [ Check the balance ] ... Find another reaction. 2Ca (g) + O 2 (g) -> 2CaO (s), . Picture of reaction: Сoding to search: 2 Ca + O2 cnd [ temp ] = 2 CaO. 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. The amount of oxygen present and the temperature determine whether the reaction is complete or incomplete. However, this is not a precipitation reaction. Our channel. The reaction of calcium with oxygen, which is expressed by the equation 2Ca + O2 --> 2CaO is a synthesis reaction. For this, we need to identify their oxidation numbers. 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