Question

Balance the following chemical equations.

1) Mg + O2 —> MgO
2) SO2 + O2 —> SO3
3) Na + Cl2 —> NaCl
4) K + O2 —> K2O

Answer 1

Balancing the equations means adding coefficients to the reactants or products so that there is an equal amount of atoms of an element on both sides of the equation.

1) 2Mg + O₂ ⇒ 2MgO

2) 2SO₂ + O₂ ⇒ 2SO₃

3) 2Na + Cl₂ ⇒ 2NaCl

4) 4K + O₂ ⇒ 2K₂O