CHEM 100 MCBS Fundamentals of Chemistry Questions see the file copy FUNDAMENTALS OF CHEMISTRY (ENGG.) ………………………… HIGHER COLL

CHEM 100 MCBS Fundamentals of Chemistry Questions see the file copy

FUNDAMENTALS OF CHEMISTRY (ENGG.)

………………………… HIGHER COLLEGE OF TECHNOLOGY
DEPARTMENT: APPLIED SCIENCE
Section: Applied Chemistry.
Final Assessment (Assignment) V2
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
2
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 4,610,000 in scientific notation, with 2 significant figures.
b)
(2 marks)
4.80 x 104 (1000)
————————– =
11.55
c) Observe the two processes and compare their differences.
(3 marks)
2 a) An element in the periodic table which is commonly used as an antiseptic and
to make drinking water safe and treat water in swimming pools. The element
is having seven electrons in its second shell (outer shell).Identify the element .
Write the electronic configuration of the element?
(1 mark)
b) Calculate the following :
i) The number of atoms in 25 g of helium.
(1 mark)
3
ii) The moles of hydrogen gas in a container occupying 33.6dm volume at STP.
(1 mark)
iii) The RMM of sodium carbonate decahydrate.
(1 mark)
iv) The mass of 0.0356 mol of Diphosphorous pent oxide.
(1 mark)
3a) How does a chemical reaction vary with a chemical equation? Illustrate with a
suitable example.
(2 marks)
b) List two important information obtained from a chemical equation.
(1 mark)
c ) How many grams of oxygen (O2) are required to completely react with 0.200g of
hydrogen (H2) to yield water?
(2 marks)
4 a) Identify the ionic molecules among the following given examples and write their
correct formulae.
(3 marks)
(i)
Rubidium Iodide.
(ii)
Carbon tetrachloride.
(iii)
Cesium sulfide.
(iv)
Nitrogen (IV) oxide.
(v)
Mercury (II) phosphide.
3
b) Mention the correct formula / type of the compound in the given space in below
table.
(2 marks)
S.No.
Name of compound
Formula of
Type of
the
Compound
compound
1
Beryllium Nitride
2
Cadmium(II) Sulfide
3
4
Be3N2
Binary ionic type I
Strontium hypochlorite
Sr(ClO)2
Chromic Acid
Acid
5. Calculate the mass % of each constituent present in Ferric sulfate which is a
crystalline compound used in water and sewage treatment to help in the removal of
suspended impurities.
(5 marks)
6. Calculate the molality of a solution of acetic acid in water in which the mole
fraction of acetic acid is 0.048.
(5 marks)
SECTION B
Long answer questions
20 marks
7a) An alkane has molecular mass 86. What is the molecular formula of the alkane?
Write three possible isomers with structures for this molecular formula? (6 marks)
b) Give three differences between an alkane and alkene.
(3 marks)
c) Give the structure of an eight carbon alkane with hydroxyl group in position 3 and
nitro group in position 4.
(1 mark)
8a) A chemistry professor asked two students to make a standard solution separately.
Student 1 was asked to prepare 1Molar solution whereas Student 2 to prepare 1
molal solution. Which method is more precise or accurate and mention the reason.
(1 mark)
b) List two points of differences between Molarity and molality.
(2 marks)
c) An hydrated compound with molecular mass 322, on analysis was found to
contain 14.31% sodium , 9.97% sulphur, 6.22% hydrogen and the rest oxygen.
Calculate the empirical and molecular formula of the compound.
(7 marks)
END OF PAPER
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