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. View Notes - Solubility from CHM 1101 at University of Ottawa. 2Ca + O2(g) —> 2CaO(s) Step 1: Determine the oxidizing agent and the reducing agent. 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. In 2Ca, its oxidaton state is 0 and after the reaction it is increased to +2 which forms a bong with oxygen ion. 2Ca (g) + O 2 (g) -> 2CaO (s), . 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 The two half equations for this reaction are: Ca -> Ca 2+ + 2e - (this reaction shows oxidation). 2Ca + O 2 2CaO [ Check the balance ] ... Find another reaction. However, this is not a precipitation reaction. Element General form: A + O 2 AO ex. Compound states [like (s) (aq) or (g)] are not required. 2Ca + O 2 (g) —> 2CaO(s) 0 0 (+2) (-2) Both of the reactants have the oxidation number zero. Replace immutable groups in compounds to avoid ambiguity. The reaction of calcium with oxygen, which is expressed by the equation 2Ca + O2 --> 2CaO is a synthesis reaction. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. For this, we need to identify their oxidation numbers. Calcium undergoes oxidation reaction to form Calcium oxide(quick lime). Approved by eNotes Editorial Team Posted on October 10, 2011 at 9:46 PM Methods for preparation of calcium oxide: 2Ca + O2 = 2CaO (above 300° C, burning on air). B) 2Ca + O2 → 2CaO It is combination reaction as two reactants react to form a single product. Thus, as Ca is oxidized while O is reduced and this is a redox reaction. How To Balance Equations It is a redox reaction (reduction and oxidation both occur) On the reactants side, the oxidation states of both Ca and O2 are 0. Equation: 2Ca + O_2 --> 2CaO Our channel. On the products side, the oxidation state of Ca is +2 while that of oxygen is -2. Picture of reaction: Сoding to search: 2 Ca + O2 cnd [ temp ] = 2 CaO. 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