# 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?