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. Thus, as Ca is oxidized while O is reduced and this is a redox reaction. The amount of oxygen present and the temperature determine whether the reaction is complete or incomplete. 2Ca + O 2 2CaO [ Check the balance ] ... Find another reaction. Equation: 2Ca + O_2 --> 2CaO On the products side, the oxidation state of Ca is +2 while that of oxygen is -2. In this reaction, calcium is being oxidised. Picture of reaction: Сoding to search: 2 Ca + O2 cnd [ temp ] = 2 CaO. where heat energy is supplied to split calcium carbonate into calcium oxide and carbon dioxide. CaH2 + O2 = CaO + H2O (300-400° C). View Notes - Solubility from CHM 1101 at University of Ottawa. Methods for preparation of calcium oxide: 2Ca + O2 = 2CaO (above 300° C, burning on air). A) CaCO3 → CaO + CO2 It is a Thermal decomposition reaction. Consider the following reaction. 2Ca (g) + O 2 (g) -> 2CaO (s), . Thermodynamic properties of substances The solubility of the substances Periodic table of elements. The two half equations for this reaction are: Ca -> Ca 2+ + 2e - (this reaction shows oxidation). For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will. It is a redox reaction (reduction and oxidation both occur) On the reactants side, the oxidation states of both Ca and O2 are 0. For this, we need to identify their oxidation numbers. You can use parenthesis or brackets []. How To Balance Equations 2Ca + O 2 (g) —> 2CaO(s) 0 0 (+2) (-2) Both of the reactants have the oxidation number zero. Half Reactions 2 Ca (s) + O2 (g) 2CaO (s) Step 1: The oxidation half-reaction shows electrons being lost by an element (electrons are 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. Element General form: A + O 2 AO ex. However, this is not a precipitation reaction. Our channel. Compound states [like (s) (aq) or (g)] are not required. Replace immutable groups in compounds to avoid ambiguity. 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 B) 2Ca + O2 → 2CaO It is combination reaction as two reactants react to form a single product. 2Ca + O2(g) —> 2CaO(s) Step 1: Determine the oxidizing agent and the reducing agent. CaCO3 = CaO + CO2 (900-1200° C). 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

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