In-Class Group Activity #3 (Chem 101, Summer 2006)
Name _________________________________
1. Classify each of the following bonds as ionic, polar covalent, nonpolar covalent or no
bond.
a) P-Cl
b) K-Br
c) H-Cl
d) C-N
e) B-H
f) K-H
2. Classify each of the following as an ionic compound or a covalent compound.
a) KCl
b) PCl3
c) CaSO4
d) HCl
e) HNO3
f) Na2HPO3
3. Given that for water: specific heat = 1.00 cal/g ºC, heat of fusion = 80 cal/g and heat
of vaporization = 540 cal/g
a) Calculate the amount of heat released (in kcal) when 1.00 kg of steam cools from
150.0 ºC to 100.0 ºC and then condenses to liquid water (2 steps).
b) Calculate the amount of heat released (in kcal) when the 1.00 kg of liquid water cools
to 0.0ºC and then freezes (2 steps).
4. Identify the type of interactive force that occurs between molecules in each of the
following substances.
a) KCl
b) NCl3
c) SBr2
d) Cl2
e) HF
f) H2O
5. Determine which of each of the following would have the higher boiling point.
a) NaCl or HCl
b) Br2 or HBr
c) H2O or H2S
d) C2H6 or C8H18
6. Balance the following chemical equations.
a)
Zn
+
HCl
b) CO
+
Fe2O3
c)
BaCl2
d) Al
+
+


Na2SO4
CuSO4 
ZnCl2
Fe

Cu +
+
+
H2
CO2
BaSO4
+
NaCl
Al2(SO4)3
7. Classify each of the following reactions as combination, decomposition, single or
double replacement, combustion and/or redox (may be more than one type for each).
a) N2 + 3H2  2NH3
b) BaCl2 + K2CO3  BaCO3 + 2 KCl
c) 2H2O2  2H2O + O2
d) CuO + H2  Cu + H2O
e) N2 + 2O2  2NO2
8. For each of the following redox reactions, state which element is oxidized and which
element is reduced.
a) 4Al + 3O2  2Al2O3
b) CuO + H2  Cu + H2O
c) 2Na + Cl2  2NaCl
d) CuCl2 + Zn  ZnCl2 + Cu
9. Below is an energy diagram for a chemical reaction:
E
Reaction Progress
a) Label the diagram with the following: reactant(s), product(s), transition state,
activation energy (EA) and heat of reaction (indicate if heat is released or absorbed).
b) Is the reaction exothermic or endothermic?
c) Is the reaction fast or slow? Why?
d) What would happen if you added a catalyst to the reaction?
e) Draw a line on the diagram to show how addition of a catalyst would change the
diagram.
10. According to LeChâtelier’s principle, which way will the equilibrium of the reaction
shown below be shifted under the following conditions?
N2 (g) + 3H2 (g)  2NH3 (g) + 22 kcal
a) N2 is added
b) NH3 is removed
c) heat is added