First Exam
Basrah University for Oil and Gas
College of Oil Engineering and Gas
Engineering Oil Department and Gas
Subject: general Chemistry
Date: 22/4/2020
Time: 2 h
First Semester 2019/2020
Q1) A) Answer Four of the followings:
(16 Marks)
1234-
What is the Molality of 22.4 g of NaCl dissolved in enough water to make 500 mL of solution?
How many grams of lithium chloride (LiCl) are required to make 500 mL of 1.50 M solution?
What is the volume of 15.8 M HNO3 is required to make 250 mL of a 6.0M solution?
How many grams of sodium bromide (NaBr) are in 150.0g of solution that is 12.0% sodium
bromide by mass?
5- Calculate the volume percentage V/V% of solution preparing by mixing 45mL methyl alcohol
with 250mL water .
B) A galvanic cell which operates at 35oC consists of a Cu2+(aq) /Cu(s) and an Ag+(aq)/Ag(s) half-cells.
The half-cells are connected by a wire for electron movement and a salt bridge filled with KNO3.
i.
ii.
By sketching a simple diagram of the galvanic cell, indicate the directions of the salt bridge's
anion and cation movement into each half-cell of the galvanic cell.
The voltage of the cell is 0.35 V and the concentration of Ca2+(aq) is 3.5 M. Determine the
concentration of Ag+(aq).
(12 Marks)
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Q2) A) Define the followings: (5 only)
(10 Marks)
Volumetric analysis , Homogeneous Mixture , Electrolytic cell , LPG , Oxidant , Reduction and
isomers .
B) Name the following compounds: (5 only)
(10 Marks)
C) Balance the following redox reaction:
(10 Marks)
Bi(OH)3 (S) + SnO42- (aq)
Bi (s)
+ SnO32- (aq)
Write down the FORMULA of the oxidizing and reducing agents.
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Q3) A) What is the composition of crude oil? With examples.
(8 Marks)
B) What are the differences between each of the following:
1- Ionic bond and Covalent bond.
2- Alkaline Battery and Zinc-carbon Battery.
(3 Marks)
(6 Marks)
C) Explain two major classifications of polymers and give an example of each class.
(5 Marks)
E) What is Stoichiometry? Give an example.
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(4 Marks)
Q4) A) What is the molecular geometry of each the following compounds:
1) PCl5
(3 Marks)
2) SF6
B) Select the compound which has the largest polarity, and why?
1) CCl4
(3 Marks)
2) HF
C) Which of the following apply EAN – Rule, and why?
1) [Co(NO2)6]3‾
2) [Fe(CO)5]
(6 Marks)
D) Identify each reaction as exothermic or endothermic of the following reactions:
(4 Marks)
i.
CaCO3 + 133 kcal
CaO
ii.
2 SO2
2 SO3 + heat
+
O2
+ CO2
❖ Atomic Weight: Na = 23 , Cl = 35.5 , Li = 7
Prof. Dr. Nabil