Consider the following reaction. 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 Thermodynamic properties of substances The solubility of the substances Periodic table of elements. Element General form: A + O 2 AO ex. Replace immutable groups in compounds to avoid ambiguity. Thus, as Ca is oxidized while O is reduced and this is a redox 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. 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. Half Reactions 2 Ca (s) + O2 (g) 2CaO (s) Step 1: The oxidation half-reaction shows electrons being lost by an element (electrons are However, this is not a precipitation reaction. How To Balance Equations B) 2Ca + O2 → 2CaO It is combination reaction as two reactants react to form a single product. For this, we need to identify their oxidation numbers. In this reaction, calcium is being oxidised. A) CaCO3 → CaO + CO2 It is a Thermal decomposition reaction. Calcium undergoes oxidation reaction to form Calcium oxide(quick lime). Picture of reaction: Сoding to search: 2 Ca + O2 cnd [ temp ] = 2 CaO. You can use parenthesis or brackets []. CaCO3 = CaO + CO2 (900-1200° C). 2Ca + O 2 (g) —> 2CaO(s) 0 0 (+2) (-2) Both of the reactants have the oxidation number zero. Methods for preparation of calcium oxide: 2Ca + O2 = 2CaO (above 300° C, burning on air). Equation: 2Ca + O_2 --> 2CaO CaH2 + O2 = CaO + H2O (300-400° C). On the products side, the oxidation state of Ca is +2 while that of oxygen is -2. Our channel. Approved by eNotes Editorial Team Posted on October 10, 2011 at 9:46 PM where heat energy is supplied to split calcium carbonate into calcium oxide and carbon dioxide. 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. 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. Compound states [like (s) (aq) or (g)] are not required. The two half equations for this reaction are: Ca -> Ca 2+ + 2e - (this reaction shows oxidation). 2Ca + O2(g) —> 2CaO(s) Step 1: Determine the oxidizing agent and the reducing agent. 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