Kingdom of Saudi Arabia
Ministry of Higher Education
Majmaah University
College of Science at Zulfi
‫ األول‬:‫المستوى‬
‫المملكة العربية السعودية‬
‫وزارة التعليم العالي‬
‫جامعة المجمعة‬
‫كلية العلوم بالزلفي‬
CHEM-104 :‫رقم ورمز المادة‬
‫هـ‬1433/7/5 :‫تاريخ االمتحان‬
‫ كيمياء عامة‬:‫اسم المادة‬
:‫الرقم الجامعي‬
:‫اسم الطالب‬
Answer the following questions:
I. Put circle around the correct answer of the following questions (15 marks) :
1. Iron, silver and copper elements:
(a) are similar in mass, size, and shape
(b) show the same physical characteristics
(c) show the same chemical characteristics
(d) are different in mass, size, and shape
2. The chemical bonding in CHCl3 is :
(a) polar covalent bond
(b) ionic bond
(c) non-polar covalent bond
(d) metallic bond
3. The chemical bonding in FeCl3 is :
(a) covalent bond
(b) ionic bond
(c) coordinate covalent bond
(d) metallic bond
4. The electron configuration of phosphorus atom (atomic weight = 15) is:
(a) 1s2 2s2 2p6 2d10 3s23p33d6
(b) 1s2 2s2 2p6 3s2 3p3
(c) 1s2 1p6 2s2 2p5
(d) All answers are wrong
5. The electron configuration of chlorine atom (atomic weight = 17) is:
(a) 1s2 1p6 2s2 2p6 3s1
(b) 1s2 2s2 2p6 2d7
(c) 1s2 2s2 2p6 3s2 3p5
(d) 1s2 2s2 2p6 3s1 3p6
6. The extremely small, invisible, and indivisible particles were called:
(a) molecules
(b) compounds
(c) atoms
(d) elements
7. Isotopes are known as atoms that have:
(a) the same number of protons
(b) different number of electrons
(c) the same number of neutrons
(d) All answers are wrong
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8. Covalent bond is taking place between:
(a) atoms of two non-metals
(b) atoms of metal and non-metal
(c) atoms of two metals
(d) All answers are wrong
9. Ionic bond is taking place between:
(a) atoms of two non-metals
(b) atoms of metal and non-metal
(c) atoms of two metals
(d) All answers are wrong
10. The oxidation number of manganese in KMnO 4:
(a)
+7
(b) -7
(c)
+1
(d) -1
+5
(d) +6
11. The oxidation number of phosphorus in AlPO4:
(a)
-5
(b) -6
(c)
12. Dalton Atomic Theory is called:
(a) modern atomic theory
(b) classical atomic theory
(c) electron shell model
(d) solar system model
13. Bohr Atomic Theory is called:
(a) modern atomic theory
(b) classical atomic theory
(c) electron shell model
(d) solar system model
14. Triple covalent bond formed by sharing of :
(a) three pairs of electrons between two metallic atoms
(b) two pairs of electrons between two non-metallic atoms
(c) three pairs of electrons between two non-metallic atoms
(d) one pair of electrons between two non-metallic atoms
15. Hydrogen bonding is formed between the molecules of:
(a) water
(b)ammonia
(c) NaCl
II. Answer the following ( 35 marks) :
Q1. Calculate Δn for the following reactions:
(a)
CH4(g) + 2H2S (g)
CS2 (g) + 4H2 (g)
(b)
3CO2(g) + 4H2O (g)
(c)
½ N2 (g) + 1½ H2 (g)
C3H8 (g) + 5O2 (g)
NH3 (g)
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(d) answers a and b
(a)
(b)
(c)
Q2. Write a chemical equation for an equilibrium system that would lead to the following
expressions
for K.
(a)
(b)
(c)
Q3. In the following second order reaction,
A + B
products
If the initial
concentration (a) is 0.16 M and k constant is 0.023 , calculate the half-life value (t½) ?
Q4. A solution used for intravenous feeding contains 4.8 g of glucose, C 6H12O6 , in 90.0 g of
water. What is the molality of glucose ?
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Q5. How much heat is given off by a 50.0 g sample of copper when it cools from 80.0 to 50.0°C ,
Knowing that the specific heat of copper is 0.382 J/g.°C?
Q6. Consider the thermochemical equation for the formation of two moles of HCl from the
elements.
Calculate ΔH when
a) 1.00 mol of HCl is formed
b)
1.00 g of Cl2 reacts.
Q7. In the reaction:
(CH3)3C-Br(aq) + OH (aq)
(CH3)3C-OH (aq)
+
Br-(aq)
The initial rate of the reaction at 55 °C was measured at a series of concentrations of both
reactants with the following results:
[(CH3)3C-Br]
0.50
1.0
1.5
1.0
1.0
[OH]
0.05
0.05
0.05
0.1
0.2
Rate (mol/L.s
0.005
0.01
0.015
0.01
0.01
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Find: (a) The order of the following reaction with respect to (CH3)3C-Br
(b) The order of the following reaction with respect to OH
(c) The overall order
Atomic weight for some element:
C= 12
H=1
O=16
S=32
Cl=35.5
P=31
With my best wishes
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