1. Chemical Formulas and Equations
Section 2
Chemical Formulas and Equations

2. Determining Chemical Names
Identify each compound as ionic or covalent
Use the table 1 on page 297 to write the chemical formula
Sulfur trioxide
Calcium fluoride
Phosphorus pentachloride
Dinitrogen trioxide
Lithium oxide

3. Chemical Formulas
A shorthand way to use chemical symbols and numbers to represent substances
Formed from the periodic table

4. Chemical Equations
Uses chemical symbols and formulas to describe a chemical reaction

5. The Process Reactants-the starting materials
Products-substances formed from reaction
Yield- the arrow separates the two

6. Balancing Equations Closed systems-nothing comes in or goes out
Total mass of the system remains the same

7. Conservation of Matter
Antoine Lavoisier
Mass is neither created nor destroyed
Mass of the reactants equals the mass of the products

8. Making Sense
Coefficient-number placed in front of a chemical symbol or formula
Only the coefficient can be changed not the subscript

9. Keep it Balanced
The number of atoms of the reactants must equal the number of atoms of the products
You’ve done it!

10. Covalent Compounds Composed of two nonmetals
Prefixes used to express number of atoms of each element

11. Ionic Compounds Composed of a metal and a nonmetal
The compounds charges must equal 0

12. Be Accurate
Accuracy would result in the correct reaction or a big mistake
Balance it out…..