Oxides are always written in molecular form. Gases are always written in molecular form. Physical state symbols in an equation can help some with these rules. HNO 2 7. Write each substance above as you would to begin a net ionic equation.
Spectator ions appear on both sides of the equation.
They are assumed to take no part in the reaction, and are canceled in the process of writing net ionic equations. A proper net ionic equation has no spectator ions in it. Using the 7 rules above write each substance in either molecular or ionic form. Cancel ions that are exactly the same on both sides of the equation. You must cancel the same number on both sides of the equation.