The Islamic University of Gaza
General Chemistry A.(ChemA 1301)
..............................‫اسم المدرس‬
Chemistry Department
Time: 2 hours
.............................................. ‫الرقم الجامعي‬
50
......................................‫اسم الطالب‬
Answer the following questions and mark your answer using (X) in the following answer sheet.
No
Answer
No
Answer
1
2
A
A
b
b
c
c
D
D
14
15
a
a
b
b
c
c
d
d
3
4
A
A
b
b
c
c
D
D
16
17
a
a
b
b
c
c
d
D
5
6
A
A
b
b
c
c
D
D
18
19
a
a
b
b
c
c
D
D
7
8
A
A
b
b
c
c
D
D
20
21
a
a
b
b
c
c
D
D
9
10
A
A
b
b
c
c
D
D
22
23
a
a
b
b
c
c
D
D
11
12
A
A
b
b
c
c
D
D
24
25
a
a
b
b
c
c
D
D
13
A
b
c
D
  
IA
1
H
1.008 IIA
3
4
Li
Be
6.941 9.012
11
12
Na Mg
22.99 24.31 IIIB IVB VB VIB
19
20
21
22
23
24
K
Ca Sc
Ti
V
Cr
39.10 40.08 44.96 47.88 50.94 52.00
37
38
39
40
41
42
Rb Sr
Y
Zr Nb Mo
85.47 87.62 88.91 91.22 92.91 95.94
55
56
57
72
73
74
Cs Ba La Hf Ta W
132.9 137.3 138.9 178.5 180.9 183.9
VIIB ┌────
25
26
Mn
Fe
54.94 55.85
43
44
Tc
Ru
(98) 101.1
75
76
Re
Os
186.2 190.2
VIIIB
27
Co
58.93
45
Rh
102.9
77
Ir
192.2
────┐
28
Ni
58.69
46
Pd
106.4
78
Pt
195.1
IIIA IVA VA
5
6
7
B
C
N
10.81 12.01 14.01
13
14
15
Al
Si
P
IB IIB 26.98 28.09 30.97
29
30
31
32
33
Cu Zn Ga Ge As
63.55 65.39 69.72 72.61 74.92
47
48
49
50
51
Ag Cd In
Sn Sb
107.9 112.4 114.8 118.7 121.8
79
80
81
82
83
Au Hg Tl
Pb Bi
197 200.6 204.4 207.2 209.0
VIIIA
2
He
VIA VIIA 4.003
8
9
10
O
F
Ne
15.99 19.00 20.18
16
17
18
S
Cl
Ar
32.07 35.45 39.94
34
35
36
Se Br Kr
78.96 79.90 83.80
52
53
54
Te
I
Xe
127.6 126.9 131.3
84
85
86
Po At Rn
(209) (210) (222)
Choose the correct answer:
1- Which of the following is an extensive property?
a) boiling point
b) Density
c) surface area
d) Temperature
2- Which statements is true about the following list of compounds? CO2; KCl; KNO3; N2O
a) CO2 is the only molecular compound.
b) CO2 and N2O are the only molecular compounds.
c) KCl, KNO3, and N2O are the only ionic compounds.
d) CO2, KNO3, and N2O are the only molecular compounds.
1
3- Which name is incorrect?
a) SCl2, sulfur dichloride
b) CS2, carbon disulfide
c) N2O4, dinitrogen tetroxide
d) Al2O3, dialuminum trioxide
4- A sample of Vitamin A, C20H30O, contains 4.0 × 1022 atoms of carbon. How many atoms of hydrogen
and how many molecules of Vitamin A does it contain?
a) 6.0 × 1022 atoms of H; 4.0 × 1022 molecules of Vitamin A
b) 4.0 × 1022 atoms of H; 4.0 × 1022 molecules of Vitamin A
c) 6.0 × 1022 atoms of H; 2.0 × 1021 molecules of Vitamin A
d) 6.0 × 1022 atoms of H; 8.0 × 1023 molecules of Vitamin A
5- According to the following equation: 2Al(s) + 3Br2(l)  2AlBr3(s)
What mass of product can be made by reacting 5.0 g of aluminum and 25 g of bromine?
a) 11 g
b) 62 g
c) 28 g
d) 42 g
6- Write a balanced net ionic equation for the following reaction and identify the spectator ion or ions
present.
FeO(s) + 2HClO4(aq)  H2O(l) + Fe(ClO4)2(aq)
a) FeO(s) + 2H+(aq) + 2ClO4−(aq)  H2O(l) + Fe2+(aq) + 2ClO4−(aq); no spectator ions
b) FeO(s) + 2H+(aq) H2O(l) + Fe2+(aq);
ClO4− spectator ion
c) FeO(s) + 2H+(aq)  H2O(l) + Fe2+(aq);
ClO4−, H+, and Fe2+ spectator ions
+
−
2+
−
d) FeO(s) + 2H (aq) + 2ClO4 (aq)  H2O(l) + Fe (aq) + 2ClO4 (aq); ClO4− spectator ion
7- A solution is made of 25.0 mL of 0.250 M nitric acid and 15.0 mL of 0.500 M hydrochloric acid all
diluted to 250 mL. What is the resulting concentration of the hydrogen ion?
a) 55.0 M
b) 0.0800 M
c) 0.0300 M
d) 0.0550 M
8- Which of the following reactions is an acid-base neutralization reaction?
a) AgNO3(aq) + NaI(aq)  AgI(s) + NaNO3(aq)
c) 2Na(s) + 2H2O(l)  H2(g) + 2NaOH(aq)
b) S8(s) + 8O2(g)  8SO2(g)
d) Ca(OH)2(aq) + 2HI(aq)  CaI2(aq) + 2H2O(l)
9- What volume of 0.125 M H2SO4 is required to completely precipitate all of the barium in 10.00 mL of a
0.150 M barium nitrate solution?
a) 12.0 mL
b) 24.0 mL
c) 6.00 mL
d) 0.206 mL
1
10- Given the following thermochemical equation, calculate the heat involved in decomposing 12.5 g of
water to the elements. 2H2(g) + O2(g)  2H2O(l)
H = −571.6 kJ
a) +396.9 kJ
b) −198.5 kJ
c) +571.6 kJ
d) +198.5 kJ
11- Which of the following sets is not an acceptable set of quantum numbers?
a) n = 2, l = 1, ml = +1
c) n = 1, l = 0, ml = 0
b) n = 3, l = 1, ml = −3
d) n = 7, l = 3, ml = +3
12- A 1.55-g sample of propane, C3H8, was burned in a bomb calorimeter whose total heat capacity is
12.3 kJ/°C. The temperature of the calorimeter plus its contents increased from 21.36°C to 27.69°C.
What is the heat of combustion per gram of propane?
a) +7.95 kJ/g
b) −50.2 kJ/g
c) +50.2 kJ/g
d) +121 kJ/g
13- Use the following thermochemical equations:
C2H5OH(l) + 3O2(g)  2CO2(g) + 3H2O(l)
H° = −1367 kJ
H2(g) + 1/2O2(g)  H2O(l)
H° = −286 kJ
C(graphite) + O2(g)  CO2(g)
H° = −394 kJ
to calculate the standard enthalpy of formation for the reaction:
2C(g) + 3H2(g) + 1/2O2(g)  C2H5OH(l)
Hf° = ?
a) +279 kJ/mol.
b) −279 kJ/mol.
c) +680 kJ/mol.
d) +2047 kJ/mol.
14- Which one of the following elements has the ground-state electron configuration [Kr]5s14d5?
a) Mn
b) Cr
c) Nb
d) Mo
15- Which of the following has the highest ionization energy? Na, Na+, K+, Mg2+?
a) Na+
b) Mg2+
c) K+
d) Na
16- In which of the following sets are all of the ions or atoms isoelectronic with one another?
(i) K+, Na+, Mg2+
(ii) Nb4+, Y2+, Rb1+
(iii) Te2−, I−, Xe
(iv) Br−, Kr, Rb+
a) iii only
b) iii and iv only
c) ii only
d) i and ii only
17- The molecular geometry of NO2 molecule is:
a) linear
b) Trigonal planar
c) Bent
2
d) Tetrahedral
18- By referring only to the periodic table, arrange the following atoms in order of increasing
electronegativity: Al, P, In, S, Si, Ga
a) Al < Si < P < S < Ga < In
c) Al < Ga < In < Si < P < S
b) In < Ga < Al < S < P < Si
d) In < Ga < Al < Si < P < S
19- Which of the following does not exhibit resonance?
a) NO2−
b) O3
c) CO32−
d) H2O2
20- Estimate the enthalpy change (ΔH) for the reaction: 2NH3  3H2 + N2
Bond
N—N
H—H
N—H
N=N
N≡N
ΔH (kJ/mol) 163
436
391
418
941
a) −97 kJ
b) +97 kJ
c) +620 kJ
d) +2346 kJ
21- In which of the following molecules do we find a trigonal pyramidal geometry?
a) SnCl2
b) BF3
c) TeCl4
d) PH3
22- Predict whether the SO2 and SO3 molecules are polar or nonpolar.
a) SO2 is nonpolar, SO3 is nonpolar
c) SO2 is nonpolar, SO3 is polar
b) SO2 is polar, SO3 is nonpolar
d) SO2 is polar, SO3 is polar
23- The Zeff for the outermost electrons of 11Na and 3Li using Slater´s rules are.
a) +2, and +1
b) +1.5, and +0.5
c) + 2.5, and +1.3
24- Calculate the energy of an X ray radiation
n with frequency of 1  1018 Hz
a) 9  10-2 J
b) 2.0  10-7 J
c) 6.63  10-16 J
d) +3.5, and +2
d) 1.5  1015 J
25- Given the gaseous reaction (in a piston):
A (g) + B (g) → C (s) . The system loses 1.2 kJ as heat, while the surroundings do work of 500 J on the
gaseous system. Calculate the change in the internal energy of the system, (∆E ) and indicate its
direction of transference.
a) – 1.9 kJ from system to surroundings.
b) + 1900 J from surroundings to system.
c) -700 J, from system to surroundings.
d) + 700 J, from surroundings to system
 Good Luck 
2