CHM 130
Dr. Debbie
HW #2b
Due Wednesday, March 26th, 2014
Names: ________________________________________
Chapters 7, 16, and 8
1. Write the products if none are given, label the states for each reactant and product if not given, then
balance the reaction and finally classify each reaction type as combination (C), decomposition (D),
single replacement (SR), double replacement (DR), combustion (CB) or acid base neutralization (N).
a. ______ type
b. _____ type
c. _____ type
____H2O2 (l)  ____H2O (___) + ____O2 (____)
____Mg(NO3)2 (____) + ____Na (____) ____________________________
AlCl3 (____) + Au (____)  ____________________________
d. _____ type
____CH4 (g) + ___2_O2 (____)  ____________________________
e. _____ type
____ Ca (____) + ____ Cl2 (_____)  ____CaCl2 (s)
f. _____ type
____HCl (aq) + ____KOH (aq)  __________________________
g. _____ type
____ Fe (____) + ____H2O (____)  ____________________________
2. Which of the following metals will react with water? Circle all that apply.
a. Sr
3.
b. Al
c. Ag
d. Na
e. Ni
Assign oxidation numbers to the elements in the reaction below and determine what is oxidized,
reduced, the oxidizing agent, and the reducing agent. The equation is already balanced.
Co (s) + Pb2+(aq)  Pb (s) + Co2+(aq)
oxidized: ___________
reduced: ___________
oxidizing agent: ___________
reducing agent: ___________
4. Which one of these chemicals is insoluble in water?
a. Cu(NO3)3
b. Al(C2H3O2)
c. Na3PO4
d. AgBr
e. BaCl2
5. What three things can be done to increase the number of successful collisions in a reaction?
a. _________________________________________________
b. _________________________________________________
c. _________________________________________________
CHM 130
Spring 2014
Hmwk 2b
6. What three changes can be made to increase the rate of a reaction?
a. _________________________________________________
b. _________________________________________________
c. _________________________________________________
7. Define activation energy:
8. In the energy profile below, label the activation energy (Ea) and the overall energy change of the
reaction (H). Is this reaction endothermic or exothermic? ____________________________
9. How many atoms are in 39.95 grams of gaseous argon? ___________________________
10. How many atoms are in 1.98 moles of copper?
11. How many moles are in 4.15 x 1025 atoms of neon?
12. What is the molar mass of iron (III) hydroxide?
13. How many grams are in 7.54 moles of iron (III) hydroxide?
CHM 130
Spring 2014
Hmwk 2b
14. How many atoms are in 1.30 grams of carbon?
15. What is the volume of 4.53 moles of gas at STP?
16. How many liters at STP would 1.08 grams of carbon dioxide occupy?
17. What is the density of carbon monoxide gas at STP?
CHM 130
Spring 2014
Hmwk 2b