CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 2 Examinations 2012/13
Module Title: Fundamentals of Chemistry
Module Code:
CHEI 6001
School:
Mechanical, Electrical & Process Engineering
Programme Title:
Higher Certificate in Science in Good Manufacturing Practice &
Technology – Stage 1
Programme Code:
SGMPR_6_Y1
External Examiner(s):
Internal Examiner(s):
Instructions:
Ms Bernadette Whelan, Dr Stephen Fitzpatrick
Dr William Doherty
Answer THREE questions in total.
SECTION A Question 1 is compulsory.
Answer any TWO questions from SECTION B.
You do not need to use separate answer book for each section.
Duration:
2 Hours
Sitting:
Summer 2013
Requirements for this examination:
Mathematical Tables
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have
received the correct examination paper.
If in doubt please contact an Invigilator.
Page 1 of 4
SECTION A
YOU MUST ANSWER THIS QUESTION
Q1.
Answer any 10 of the following parts. Each part carries equal marks
Describe/define the following terms, giving examples where appropriate.
(a)
(b)
(c)
(d)
Protons, neutrons and electrons
Oxidation State
Primary Standard
Cations and anions
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
Electronegativity
Dipole moment
Intermolecular forces
Isotopes
The mole
Concentration
Solute, solvent and solution
Covalent bonding
[40 marks]
Page 2 of 4
SECTION B – ANSWER ANY TWO QUESTIONS
Q2.
(a) Balance the following chemical equations:
(i)
H2SO4(aq) + NaCl(aq)  HCl (aq)+ Na2SO4(aq)
(ii)
C8H12O2(l) + O2(g)  CO2 (g) + H2O(g)
(iii)
MnO4 (aq) +Fe2+ (aq) + H+(aq) Mn2+(aq) + Fe3+(aq) + H2O(l)
[10 marks]
(b)
Write the Lewis Structure and full electronic configuration for the
following elements:
Al, C, N, Mg and Ne
[10 marks]
(c)
Use Valence State Electron Pair Repulsion Theory to predict the shape of
the following molecules. Provide a sketch illustrating the shape of these
molecules.
CH4. NH3, PCl5, H2O
[10 marks]
Q3.
In an experiment to determine the amount of ammonia (NH3) in a household
cleaner, sulphuric acid (H2SO4) is titrated against a diluted sample of the
household cleaner using methyl orange to indicate the end point.
Procedure:
 10.0g of domestic ammonia solution was weighed out and transferred
quantitatively to 250cm3 volumetric flask and diluted to the mark.

4 x 20cm3 aliquots of this solution were titrated with standardised H2SO4
solution (0.2M) with a few drops of indicator to establish the end point.
The results of the titrations were as follows:
Titration Number
Titre (cm3 H2SO4)
1
8.55
2
7.68
3
7.70
4
7.69
Continued overleaf…
Page 3 of 4
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
Q4.
(a)
(b)
(c)
Draw the titration apparatus for this experiment.
What is meant by “standardised” H2SO4.
Write the equation for this reaction.
Calculate the number of moles of H2SO4 used in the titration.
Deduce the number of moles of ammonia (NH3) used in the titration from
the reaction equation.
Calculate the mol.dm-3 concentration of ammonia in the solution of
household cleaner used in the titration
Calculate the number of moles of ammonia in the 250cm3 of household
cleaner solution.
Calculate the mass of ammonia (in grams) of NH3 in 250cm3 of household
cleaner solution. (Mr NH3 = 17.03 g mol-1)
The answer in part (h) is also the number of grams of NH3 in the mass of
household cleaner weighed out initially. Express this value as a %.
[30 marks]
Discuss trends in the Periodic Table addressing issues such as radius,
electronegativity, ionization potentials, etc.
[10 marks]
Discuss the types of intermolecular forces present between molecules and
the effects these have on the physical properties of the molecules.
[10 marks]
(i)
Give the number of protons, neutrons and electrons for atoms of
the following species:
23
, 12 , 28 and 40
[5 marks]
18 Ar
11 Na 6 C 14 Si
(ii)
Concisely explain the value (correct to two places of decimals) of
the relative atomic mass for chlorine is 35.45
[5 marks]
Page 4 of 4