1. Classifying Chemical Reactions
Section 10.2

2. Objectives Classify chemical reactions
Identify the characteristics of different classes of chemical reactions

3. Key Terms Synthesis reaction Combustion reaction
Decomposition reaction
Single-replacement reaction
Double-replacement reaction
precipitate

4. 5 Types of Reactions Synthesis Combustion Decomposition
Single-Replacement
Double-Replacement

5. Synthesis Reaction
Two or more substances combine to form one single product.
A + B  AB
Ex: 2Na(s) + Cl2(g)  2NaCl(s)

6. Combustion Reaction
Oxygen combined with a substance releasing energy (light and heat)
Many combustion reactions are also synthesis reactions
Ex: 2H2(g) + O2  2H2O(g)

7. Decomposition reactions
One compound breaks down into 2 or more compounds or elements
Often requires energy
Setup: AB A + B
Ex: NH4NO3(s)  N2O(g) + 2H2O(g)
Heat was required

8. Replacement Reactions
Replacement of an element in a a compound
2 kinds of replacement reactions:
Single
Double

9. Single Replacement Reactions
Atoms of one element replace the atoms of another element in a compound
Setup: A+ BX  AX + B

10. Activity Series of Metals
Whether or not a metal will replace another metal or any other substance depends on its reactivity
Figure on page 288
Metals can replace any metal BELOW it on the series. Not ABOVE it (NR)

11. Practice Problems
Page 289

12. Double Replacement Reactions
Involves the exchange of ions between 2 compounds
Setup: AX + BY  AY + BX
If a solid is produced during the reaction it is called a precipitate

13. Practice Problems
Page 291

14. Homework
Page 291 #27-32