Calcium metal is heated with oxygen gas to yield calcium oxide.
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The equation for the reaction between calcium metal (Ca) and oxygen gas (O2) to produce calcium oxide (CaO) can be written as:
2Ca + O2 ⟶ 2CaO
To understand how this reaction produces calcium oxide, you need to know a few key concepts:
1. Chemical Formula: The chemical formula represents the elements present in a compound. In this case, calcium metal is represented by the symbol Ca, oxygen gas by the symbol O2, and calcium oxide by the formula CaO.
2. Chemical Equation: A chemical equation represents a balanced equation that shows the reactants and products of a chemical reaction. It also provides information about the stoichiometry, indicating the relative amounts of each substance involved.
3. Reactivity: Calcium is a highly reactive metal, and oxygen is a gas that supports combustion. When heated, calcium reacts with oxygen to form calcium oxide.
4. Conservation of Mass: In a chemical reaction, mass is neither created nor destroyed. This principle is known as the law of conservation of mass. Therefore, the total mass of the reactants (calcium and oxygen) will be equal to the total mass of the products (calcium oxide).
In the reaction between calcium metal and oxygen gas, two calcium atoms react with one oxygen molecule (composed of two oxygen atoms) to form two calcium oxide molecules. This balanced equation shows that the same number of each element is present on both sides:
2Ca + O2 ⟶ 2CaO
By heating calcium metal with oxygen gas, calcium oxide is produced.