Writing Complete
Chemical Equations
Unit 10.2
Chapter 9 Section 2
Pg. 312-317
Chemical Equations
Chemical Equations can be written as word equations.
Ex. C6H12O6 + 6O2 6CO2 + 6H2O
Word Equation:
Chemical Equations
Word Equations can be written as Chemical Equations
Steps In Writing Equations
1. Write the formulas for the reactants and products.
2. Count the number of each element to see if the
equation is “balanced”. (Conservation of Matter)
3. Use coefficients to balance the equation. But
never the number “1”.
Chemical Equations
Ex. Nitrogen trihydride + Oxygen
heat
Dinitrogen monoxide + water +
Review
IONIC FORMULA RULES:
COVALENT FORMULA RULES:
(If Metal with Nonmetal)
• Metal (+) ion is written
first, followed by the
nonmetal ion (-).
• Charges must add up to 0.
• If they don’t, use crisscross method
(If Nonmetal and Nonmetal)
• Write the element symbol
• Write the prefix as a
subscript
• No prefix = 1
Example
Write the equation for the reaction of hydrogen and oxygen to
form water.
Practice
Write the equation for the reaction of nitrogen and hydrogen to
form ammonia gas, NH3.
Practice
Write the equation for the reaction of sodium and chlorine to
form sodium chloride.