Uploaded by فاطمة سالم عبد الحسين موسى

اسئلة ك-عامة

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)
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.
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)
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.
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.
(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)
CaCO3 + 133 kcal
2 SO2
2 SO3 + heat
+ CO2
❖ Atomic Weight: Na = 23 , Cl = 35.5 , Li = 7
Prof. Dr. Nabil