CHEM 100 mcbs Fundamentals of Chemistry Questions 2 copies for 2 students ………………………………………………………. HIGHER COLLEGE O

CHEM 100 mcbs Fundamentals of Chemistry Questions 2 copies for 2 students ………………………………………………………. HIGHER COLLEGE OF TECHNOLOGY
DEPARTMENT: APPLIED SCIENCE
Section: Applied Chemistry.
Final Assessment (Assignment) V-5
Semester: II
Date:
A. Y.:2019 / 2020
01.05.2020 from: 10am
To: 03.05.2020 10am
Student Name
ID Number
Specialization
Level
DIPLOMA YR 1
Course Name
FUNDAMENTALS OF CHEMISTRY (ENGG.)
Course Code
CHEM1100
5
Section
SECTION A
Question No.
Max.
Marks
1
SECTION B
Question No.
Max. Marks
5
7
10
2
5
8
10
3
5
4
5
5
5
6
5
Sub Total
30
Sub Total
20
Grand Total
Marks
Obtained Marks
/ 50
First Marker :
Second Marker:
Signature:
Signature :
Date :
Date :
1
Obtained Marks
INSTRUCTIONS TO STUDENTS
1. Type / write your full name and student number (ID Number) on the top of each page of
your Final Assessment (assignment)answer script (You can put them as “header” of each page).
2. The Final Assessment (Assignment) will be posted in the e-learning portal as per schedule. You
are given 2 days (48 hours) to answer the Final Assessment (Assignment). You must submit your
answer script through e-learning portal on or before the time and day as per schedule. However,
students may submit their Final Assessment (assignment) answer script through HCT e-mail in
exceptional cases as stipulated in the General Guidelines for students (Guideline No. 3). Multiple
submissions are not allowed.
3. All answers should be computerized in MS Word. However for some courses, answers can be
handwritten on white paper using blue or black ink, scanned and must be submitted. Answers
can also be a combination of computerized and handwritten, as the case maybe, most especially
for courses that require formula or computation/calculations in their answers
4. This Final Assessment (assignment) is an open assessment, which means you may use course
handout, PowerPoint slides, textbooks and other relevant references including e-books and
internet websites (Masedar, Proquest, etc.). However, proper citation is required.
5. Marks will be deducted / cut for plagiarized work according to the plagiarism policy of the
College.
6. Submission after the allotted time will NOT be accepted. However, kind consideration could
be implemented as long as the processes stipulated in the General Guidelines for students
(Guideline Nos. 6 and 7) are strictly followed.
7. You are required to type your full name, ID number and date below the academic integrity
student declaration. This will be considered as your signature which means conformance to the
student declaration.
If you need more clarification, read the general guidelines for students posted in the e-learning
portal or feel free to contact your lecturer.
__________________________________________________________________________
Academic Integrity Student Declaration
I hereby declare that all my answers in this final assessment (assignment) are my own original
idea and work except for those that I have explicitly acknowledged with proper citations, the
source of the information. I also understand that plagiarism is an offense that can lead to
reduction of marks or disciplinary actions depending on the seriousness of the case.
Student Name: _____________________
ID Number: __________________
Date: _______________________
2
SECTION A
Short answer questions
30 marks
Note: Answer all the questions
1 a) Express 980,310,000 in scientific notation, with 2 significant figure.
b)
(2 marks)
18.50 x 103 (100)
—————————– =
250.7
c) Observe the two processes and compare their differences.
(3 marks)
2a) A silvery-white, lightweight metal. It is soft and malleable which is used in a huge
variety of products including cans, foils, kitchen utensils, window frames, and aero
plane parts. The element is having three valence electrons in its third shell (outer
shell).
Identify the element. Write the electronic configuration of the element? (1 mark)
3
b) Calculate the following :
i) The number of molecules in 110 g of carbon dioxide.
(1 mark)
ii) The moles of methane gas in a container occupying 56.5dm3 volume at STP. (1 mark)
iii) The RMM of copper Sulfate penta hydrate.
(1 mark)
iv) The mass of 0.025 mole of phosphorus pentachloride.
(1 mark)
3. (a) How does a chemical reaction vary with a chemical equation? Illustrate with a
suitable example.
(2 marks)
(b) What are the information conveyed by a chemical equation?
4
(1 mark)
(c) How many grams of oxygen (O2) are required to completely react with 0.5g of
nitrogen (N2) to yield NO2?
(2 marks)
4 (a) Identify the ionic molecules among the following given examples and write their
correct formulae.
(3 marks)
(i)
Cesium Fluoride.
(ii) Dinitrogen tetroxide.
(iii)
Calcium oxide.
(iv) Sulfur trioxide.
(v)
Aluminum phosphide.
(b) Mention the correct formula / type of the compound in the given space in below
table.
(2 marks)
S. N.
Name of compound
Formula of the
compound
1
Magnesium Nitride
Mg3N2
Type of Compound
Binary ionic type II
2
Vanadium (v) Oxide
3
Calcium chlorate
4
Ca (ClO3)2
Acid
Carbonic Acid
5
5. Calculate the mass % of each constituent present in Potassium dichromate. Which is
a crystalline compound is soluble in water, is used for preparing strong cleaning
solutions for glassware and for etching materials. It also has uses in leather tanning,
photographic processing, cement, and wood staining.
(5 marks)
6. Calculate the molality of sulfuric acid solution in water in which the mole fraction of
sulfuric acid is 0.15.
(5 marks)
SECTION B
Long – answer Questions
20 Marks
7a. An alkane has molecular mass 72.What is the molecular formula of the alkane? Write
down all possible isomers with structures for this molecular formula?
(6 marks)
6
b. Give three differences between saturated and unsaturated hydrocarbons. (3 marks)
S. N.
Saturated Hydrocarbons
Unsaturated Hydrocarbons
1
2
3
b. Give the structure of a 5 carbon alkane with hydroxyl group in position 2 and bromo
group in position 4.
(1 mark)
8a. A chemistry professor asked to his two students to make the standard solution
separately. First student was asked to prepare 2Molar solution whereas second
student has to prepare 2 molal solution. Which method is more precise or accurate
and mention the reason.
(1mark)
b. List any points of differences between Molarity and molality.
S. N.
Molarity
Molality
7
(2 marks)
c. An organic compound containing carbon, hydrogen and oxygen gave the following
percentage composition. C= 40.68%; H = 5.085% and O = 54.228. The molecular mass of
the compound is 118. Calculate the empirical and molecular formula.
(7 marks)
END OF PAPER
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