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Write the equation for the reaction of calcium and oxygen. Write the oxidation numbers for both the reactants and the products. What is the reducing agent and why?

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2Ca + O2 ==> 2CaO
Here is how you do the oxidation numbers.
http://www.chemteam.info/Redox/Redox-Rules.html
The reducing agent is the one that is oxidized and oxidation is the loss of electrons. Post your answers for a check if you wish.
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