1. Types of Chemical Reactions
Chapter 3 Sections 1 and 2
Types of Chemical Reactions

2. Types of Reactions
Synthesis or Combination
Decomposition
Combustion

3. Synthesis When two or more elements combine to form a single compound
Ex: Hydrogen gas reacts/combines with fluorine gas to produce a gas.
Chemical Equation:
H2(g) + F2(g) → 2 HF(g)

4. Decomposition
A reaction in which one compound is broken down into two or more simpler substances.
Decomposition of a binary compound:
Water is decomposed using electrical current into its base elements
H2O(l) → H2(g) + O2(g)

5. Decomposition
Decomposition of a metal carbonate will produce a metal oxide and CO2 gas.
Solid barium carbonate is strongly heated
BaCO3(s) → BaO(s) + CO2(g)

6. Decomposition
Decomposition of a metal chlorate will produce a metal chloride and O2 gas.
Solid barium carbonate is strongly heated
Ba(ClO3)2 (s) → BaCl2(s) + 3 O2(g)

7. Decomposition
Decomposition of a hydrogen peroxide will produce H2O and O2 gas.
Decomposition of ammonium carbonate will produce ammonia, water and CO2(g)
Acids decomposed to produce nonmetal oxides and water
H2SO4(aq) → H2O(l) + SO3(g)

8. Combustion Reactions When a substance reacts with oxygen
Hydrocarbons and compounds composed of only the elements C,H and O will always produce CO2 and H2O
Combustion of propane
C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l)

9. Quiz Time!

10. Which of the following is the chemical equation for the following reaction?
The synthesis of magnesium and chlorine gas
A) Mg + 2 Cl → MgCl2
B) Mg + Cl2 → MgCl2
C) Mg + 2 Cl → MgCl
D) Mg + 2 Cl → MgCl2

11. Which of the following is the chemical equation for the following reaction?
The decomposition of magnesium carbonate:
A) MgCO3 → Mg + CO3
B) MgCO3 → Mg + CO2
C) MgCO3 → MgO + CO3
D) MgCO3 → MgO + CO2
E) MgCO3 → Mg + C + O2

12. Which of the following is the chemical equation for the following reaction?
The decomposition of Potassium chlorate:
A) KClO3 → K + ClO3
B) KClO3 → K + Cl2 + O2
C) KClO3 → KCl + O2
D) KClO3 → KClO2 + O2
E) KClO3 → KClO + O2

13. Which of the following is the chemical equation for the following reaction?
The combustion of butane:
A) C4H8 + O2 → CO2 + H2O
B) C4H10 + O2 → CO2 + H2O
C) C4H12 + O2 → CO2 + H2O
D) C4H12 + O2 → CO2 + H2O
E) C4H8 + O2 → CO2 + H2O