1. Types of Chemical Reactions
Prentice-Hall Chapter 11.2
Dr. Yager

2. Objectives Describe the five general types of reactions.
Predict the products of the five general types of reactions.

3. There are five general reaction types:
combination
decomposition
single-replacement
double-replacement
combustion

5. A combination (or synthesis) reaction is a chemical change in which two or more substances react to form a single new substance.

6. Mg(s) + N2(g) Mg3N2(s)
3Mg(s) + N2(g) Mg3N2(s)

7. A decomposition reaction is a chemical change in which a single compound breaks down into two or more simpler products.

9. HI H I2
2HI H I2

10. A single-replacement reaction is a chemical change in which one element replaces a second element in a compound.

11. The activity series of metals lists metals in order of decreasing reactivity.

13. Fe(s) + Pb(NO3)2(aq) Fe(NO3)2(aq) + Pb(s)
Cl2(aq) + 2NaI(aq) NaCl(aq) + I2(aq)
Ca(s) + 2H2O(l) Ca(OH)2(aq) + H2(g)

14. A double-replacement reaction is a chemical change involving an exchange of positive ions between two compounds.

16. a. 3NaOH(aq) + Fe(NO3)3(aq) Fe(OH)3(s) + 3NaNO3(aq)
b. 3Ba(NO3)2(aq) + 2H3PO4(aq) Ba3(PO4)2(s) + 6HNO3(aq)

17. A combustion reaction is a chemical change in which an element or a compound reacts with oxygen, often producing energy in the form of heat and light.

19. C6H12O6 + 6O CO2 + 6H2O

20. How can you predict the products of the five general types of reactions?
The number of elements and/or compounds reacting is a good indicator of possible reaction type and thus possible products.

26. 1. What type of reaction is described by the following equation?
6Li + N2  2Li3N
combination reaction
decomposition reaction
single-replacement reaction
combustion reaction

27. 1. What type of reaction is described by the following equation?
6Li + N2  2Li3N
combination reaction
decomposition reaction
single-replacement reaction
combustion reaction

28. 2. Balance the following equation and indicate whether it represents a combustion, combination, or decomposition reaction.
H2SO4  H2O2 + SO2
H2SO4  H2O2 + SO2, combination
H2SO4  H2O2 + SO2, decomposition
H2SO4  2H2O2 + SO2, combination
H2SO4  2H2O2 + SO2, decomposition

29. 2. Balance the following equation and indicate whether it represents a combustion, combination, or decomposition reaction.
H2SO4  H2O2 + SO2
H2SO4  H2O2 + SO2, combination
H2SO4  H2O2 + SO2, decomposition
H2SO4  2H2O2 + SO2, combination
H2SO4  2H2O2 + SO2, decomposition

30. 3. Predict the missing product in the following unbalanced equation.
Pb(NO3)2 + KOH  KNO3 + ____________
PbOH2
Pb(OH)4
Pb(OH)2
PbOH

31. 3. Predict the missing product in the following unbalanced equation.
Pb(NO3)2 + KOH  KNO3 + ____________
PbOH2
Pb(OH)4
Pb(OH)2
PbOH