Given the equation representing the reaction:
2Ca(s) + O₂(g) → 2CaO(s)
The element changes in oxidation number (Option 2)
What is a chemical equation?
Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
From the law of conservation of matter, we can conclude that the constant entities in a given reaction are:
- Atomic number
- Number of protons per atom
- Number of neutrons per atom.
Therefore, each element tends to change their oxidation number during a chemical reaction.
How to determine the change in oxidation number
2Ca(s) + O₂(g) → 2CaO(s)
- Oxidation number of Ca = 0 (group state)
- Oxidation number of O₂ = 0 (group state)
- Oxidation number of O in compound = –2
- Oxidation number of Ca in CaO =?
Ca + O = 0
Ca + (–2) = 0
Ca – 2 = 0
Ca = 2
Thus,
- Ca changes oxidation number from 0 to +2
- O changes oxidation number from 0 to –2
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