1. N2(g) + 3H2(g) → 2 NH3(g) CHEMICAL EQUATION
A shorthand expression showing the changes that takes place as a result of a chemical change
1 mole of nitrogen gas combined with 3 moles of hydrogen gas to form 2 moles of ammonia gas
N2(g) + 3H2(g) → 2 NH3(g)
REACTANTS
PRODUCT

2. POINTS TO REMEMBER WHEN WRITING A CHEMICAL EQUATION
What are the facts?
Are the formulas written correctly?
Is the equation balanced?
N2(g) + 3H2(g) → 2 NH3(g)

3. SYMBOLS USED IN CHEMICAL EQUATIONS+
Used to separate the formulas of reactants and products →
“yields”; separates reactants from products ⇄
Represents a reversible reaction
(s)
solid
(l)
liquid
(g)
gas
(aq)
Aqueous; dissolved in water ↑
Used as alternative to (g) for a gaseous product ↓
Used as alternative to (s) for a solid product (precipitate)
→or →
Indicates that heat is supplied to the reaction
Indicates the reaction requires a catalyst (ex Pt)
heat ∆ Pt