Prince George’s Community College
CHM1010(Shah)
Exam: 2 (100 points)
Part I: Multiple choices: Select the best answer and circle it.
1.
Which one of the following is a perchloric acid?
a. HClO3
2.
b.
b. 5% acetic acid
5.
c.
HClO2
d.
HClO
c. hydrochloric acid
d.
salt
Which of the following compounds is insoluble in water?
a. Na2CO3
4.
HClO4
Which one of the following solution is a non electrolyte?
a. Sugar
3.
(40 points)
b.
(NH4)2CO4
c.
ZnCO3 d.
Rb2CO3
For a redox reaction, a loss of electrons occur at:
a. reduction half-reaction
c.
oxidation half reaction
b. in both half – reactions
d.
Can’t be determined.
4.0g NaOH is dissolved in a distilled water in a 1000mL volumetric flask.
What is the molarity of the solution?
a. 0.10M
6.
b.
b.
b.
d.
0.05M
KNO3
c.
Na2SO4
d. all of these
+3
c.
+5
d.
+7
Unit of pressure Pascal(Pa) is equivalent to:
a. kg/(m.s)
b.
e. b. and c. both
9.
1.0M
Determine the oxidation state of sulfur in SO3.
a. +6
8.
c
Which one of the following compound is soluble in water?
a. NH4Cl
7.
0.20M
kg/(m.s2)
f.
c.
kg/(m2.s2)
d. N.m-2
b. and d. both
797.7mmHg = ________ atm
a. 0.953
b.
1.050
c.
1
-273.15
d.
273.15
10.
What is the molar volume of 64.0 g O2 gas at STP?
a. 22.4L b.
11.
111.2 L
b.
0K
e. a. and b. both
14.
67.2L
c.
-273.15°C
f.
b and c both
d.
273.15K
What is the effusion rate between O2 and H2 gas?
a. 4:1
13.
44.8L d.
Absolute zero temperature means:
a. 0°C
12.
c.
b.
1:4
c.
16:1
d.
1:16
e.
2:1
Standard temperature and pressure (STP) are:
a. 0K and 1 atm
b.
373.15K and 760mmHg
c. 0°C and 1 mmHg
d.
0K and 760mmHg
Which one of the following under goes oxidation in the following redox
reaction?
Fe(s) + Cu2+(aq)  Cu(s) + Fe2+(aq)
a. Cu(s) b.
15.
b.
1.42g/L
11.2/L
Fe2+(aq)
c.
32g/L
d.
16g/L
c.
44.8L
d.
32L
SI unit for energy is:
a. Joule b. kg.m2/s2
18.
Fe(s) d.
Standard molar volume of 2 moles of N2 is:
a. 22.4L b.
17.
c.
The density of 1 mole of O2 gas at STP is:
a. 0.70 g/L
16.
Cu2+(aq)
c.
a. and b. both d.
The following reaction is:
2
None of these
H2(g) + ½ O2(g)  H2O(l) ∆Hrxn = -286kJ
19.
a. endothermic
b.
exothermic
c. decomposition
d.
can’t be determined
According to which law enthalpy change of an overall reaction is the sum
of the enthalpy changes of its individual reactions?
a. Boyle’s
20.
b.
Dalton’s
Hess’s
d.
c.
∆H°= 0 d.
Graham’s
For an endothermic reaction:
a. ∆H° < 0
b.
∆H°> 0
Part II Problems solving (show complete work)
1.
c.
(60 points)
Write chemical formula for the following compounds (15)
a. Iron II phosphate
b. Calcium hydroxide
c. Silver nitrate
d. Potassium chromate
e. Sulfuric acid
Write chemical name:
a. Fe2O3
b.
Al(OH)3
c. H2O2
3
∆H°≤ 0
d. BaCl2
e. H2S
2.
Write the products and balance the following reactions. (10)
a. AgNO3(aq)
Na2CrO4 (aq) 
b. H2SO4(aq)
+
c. Pb(NO3)2
+
d. NaNO3
3.
+
+
MgCO3(s) 
(NH4) 2SO4 
BaCl2

Ammonia can be synthesized by the following reaction: (15
points)
3H2 (g) + N2 (g)  2NH3(g)
If 5.22 kg of H2 reacts with 31.5kg of N2:
a. Which one is a limiting reactant?
4
b. What is the theoretical yield of ammonia?
c. If the experimental yield of NH3 is 28.3kg, what is the %
yield?
4.
A gas has a density of 1.43g/L at a temperature of 23°C and a
pressure of 0.789atm. Calculate its molar mass.
(15points)
5
5.
3.10g of a piece of pure copper penny is found in the snow at 8°C . How much heat is absorbed by the penny as it warms from
-8°C to 37.0°C? (Cs of copper is 0.385J/g.°C)
6.
True or false:
(5 points)
a. Vapor pressure which depends ONLY on the water temperature.
b. Ba(OH)2 is insoluble in water.
c. A spectator ion is an ion in an ionic equation that does not take part in
the reaction.
d. Molecules move randomly in straight lines in all directions and at
various speeds until they collide with another gas molecule or wall of
the container.
e. Gases tend to behave ideally at high pressure and low
temperature.
6