Question

$2\mathrm{Mg}\left(s\right)+O_2\left(g\right)\to 2\mathrm{MgO}\left(s\right)$
In the given equation, magnesium (Mg) is a

• A. reactant
• B. product
• C. condition
• D. catalyst

Answer 1

The correct option is A reactant

In a chemical equation, the reactants (substances combining) are written on the left side of the arrow and the products (substances produced) are written on the right side of the arrow.
So, in the given equation, magnesium $\text{(Mg)}$ and oxygen $\left({\text{O}}_2\right)$ are reactants and magnesium oxide $\text{(MgO)}$ is the product.