1. Chemical Reactions in Aqueous Solutions
Chapter 8
Section 8.3

2. Predicting Whether a Reaction Will Occur.
Formation of a gas.
Formation of a precipitate (solid).
Formation of water (H2O).
Transfer of electrons.
Mg O

3. Types of Chemical Reactions
Synthesis (Combination) Reactions
A + B → AB
Examples:
Mg + Cl2 → MgCl2
2Al + 3Br2 → 2AlBr3
CaO + H2O → Ca(OH)2

4. Special Cases (A-B-C-C) of Synthesis (Combination) Reactions
Nonmetal Oxide + Water → Acid SO3 + H2O → H2SO4 Metal Oxide + Water → Base MgO + H2O → Mg(OH)2 Metal Oxide + Carbon Dioxide → Carbonate Na2O + CO2 → Na2CO3 Metal Chloride + Oxygen → Chlorate 2KCl + O2 → 2KClO3

5. Practice Problems Na + Cl2 → Ba + I2 → CaO + CO2 → AlCl3 + O2 →
CO H2O →

6. Types of Chemical Reactions
Decompostion Reactions
AB → A + B
Examples:
MgCl2 → Mg + Cl2
2AlBr3 → 2Al + 3Br2
Ca(OH)2 → CaO + H2O Δ

7. Special Cases (A-B-C-C) of Decomposition Reactions
Acid → Nonmetal Oxide Water
H2SO4 → SO H2O
Base → Metal Oxide Water
Mg(OH)2 → MgO H2O
Carbonate → Metal Oxide Carbon Dioxide
Na2CO3 → Na2O CO2
Chlorate → Metal Chloride Oxygen
2KClO3 → 2KCl O2

8. Practice Problems
AlCl3 →
BaCO3 →
Ca(OH)2 →
Mg(ClO3)2 →
H2CO3 →

9. Fuel + Oxygen → Carbon Dioxide + Water
Combustion Reactions
Fuel + Oxygen → Carbon Dioxide + Water
CH O2 → CO H2O
Balance in alphabetical order
carbon,
hydrogen,
resolve odd/even differences
then oxygen

10. Practice Problems C2H6 + O2 → C4H10 + O2 → C6H14 + O2 → C3H6O + O2 →

11. Single-Replacement Reactions
Element1 + Compound1 → Compound2 + Element2
A BX → AX B
Use the Activity Series for Metals to
determine if a reaction will occur.
Element A MUST be ABOVE element B on
the Activity Series for a reaction to occur.
Exceptions exist concerning hydrogen.
Halogens can replace other halogens in the
same manner.

12. Key Vocabulary: Chemical change Chemical equation Reactants Products
Balancing the chemical equation
Link for Quizlet cards:

13. What do I need to remember from previous units?
Writing Formulas (chapter 4)
Audio Review: Click on Chapter 4
Powerpoint overview: Click on Chapter 4
Key Vocabulary on Quizlet
Naming: Dichotomous Key
Practice: Name that Compound! (Quizlet Set)