Problem: 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?

FREE Expert Solution

metal + oxygen → metal oxide


Recall the mnemonic for redox reactions:

Loss Electrons  Oxidation  Reducing Agent

Gain Electrons  Reduction  Oxidizing Agent


 element that loses electrons/oxidized is the reducing agent


  • Oxidation State of atoms in elemental form = 0
    • For compounds (except peroxides or superoxides), O.S. of O = -2
    • For Group 2A ions → O.S. = +2


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Problem Details

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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