1. #20 Write a balanced equation for the complete combustion
of each compound:
a. formic acid: HCOOH
2HCOOH + O H2O CO2
b. heptane: C7H16
C7H O H2O CO2

2. 21. Write a balanced equation for the complete combustion of
glucose: C6H12O6
C6H12O O H2O CO2 6 6 6

3. #22 What are the five types of chemical reactions?
COMBINATION

4. DECOMPOSITION

5. SINGLE-REPLACEMENT

6. DOUBLE-REPLACEMENT

7. COMBUSTION

8. #23 What are the keys to predicting the products of the five
general types of reactions?
combination: Two elements combine to form one new
compound.
decomposition: one compound breaks up into its elements.
single replacement: one element replaces another in a
4. double replacement: two compounds exchange ions to form
two new compounds.
5. combustion: a fuel reacts with oxygen gas to form carbon
dioxide and water vapor.

9. #24 Classify each reaction and balance the equations:
a C3H O2  CO H2O 2 9 3 6 6 3
combustion
b Al(OH)  Al2O H2O 2 3
decomposition
c Li + O  Li2O 4 2
combination
d Zn AgNO  Ag Zn(NO3)2 2 2
single replacement

10. #25 Which of the five general types of reactions would most
likely occur, given each set of reactants? What are the probable
products?
an aqueous solution of two ionic compouds
double replacement is most likely. The most likely products
are two new compounds.
b. a single compound
a decomposition is most likely. The elements from which this
compound is composed are the likely products.
c. two elements
a combination is most likely. The likely product will be a
“combination” of the two elements
d. oxygen and a compound of carbon and hydrogen
combustion. The likely products are CO2 and H2O

11. #26 complete and balance an equation for each reaction:
a. CaI Hg(NO3)  ? (HgI2 precipiates)
a. CaI Hg(NO3)  HgI2(s) Ca(NO3)2
b. Al Cl  ?
b. 2Al Cl  AlCl3
c Ag HCl  ?
c. 2Ag HCl  AgCl H2(g)
d. C2H O  ?
d. 2C2H O  CO H2O
e. MgCl  ?
e. MgCl  Mg Cl2

12. A precipitate gas Water
#27 What are the three types of products that result in
double-replacement reactions?
A precipitate
gas
Water