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HSC511S - HEALTH SCIENCE CHEMISTRY - 2ND OPP - JULY 2023 |
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n Am I BI A u n IVE Rs ITY
OF SCIEn CE TECHn OLOGY
FACULTYOF HEALTH,APPLIEDSCIENCESAND NATURAL RESOURCES
SCHOOL OF HEALTH SCIENCES
DEPARTMENT OF CLINICAL HEALTH SCIENCES
QUALIFICATION: BACHELOROF ENVIRONMENTAL HEALTHSCIENCES
BACHELOROF SCIENCESIN HEALTHSYSTEMSINFORMATION MANAGEMENT
BACHELOROF MEDICAL LABORATORYSCIENCES
BACHELOROF HUMAN NUTRITION
QUALIFICATION CODE: 08BEHS
07BHIS
08BMLS
08BOHN
LEVEL: 5
COURSE CODE: HSCSllS
COURSE NAME: HEALTHSCIENCECHEMISTRY
SESSION: JULY2023
DURATION: 3 HOURS
PAPER: THEORY
MARKS: 100
EXAMINER(S)
MODERATOR:
SECOND OPPORTUNITY EXAMINATION QUESTION PAPER
DR MPINGANA AKAWA
DR MARIUS MUTORWA
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
PERMISSIBLE MATERIALS
Non-programmable Calculators
THIS QUESTION PAPER CONSISTS OF 9 PAGES {Including this front page and Periodic Table)
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SECTION A
(60]
QUESTION 1: Multiple Choice Questions
• There are 20 multiple choice questions in this section. Each question carries 3 marks.
• Answer ALLquestions by selecting the letter of the correct answer.
• Choose the best possible answer for each question, even if you think there is another
possible answer that is not given.
1.1 Convert 12300 to scientific notation.
A. 1,2300
B. 1.2300
C. 1.2300 X 104
D. 1.23 x 104
1.2 An object has a volume of 0.0010 m3. Its volume given in cm3 is:
A. 0.10
B. 1000
C. 100
D. 10
1.3 The isotope atoms differ in?
A. number of neutrons
B. atomic number
C. number of electrons
D. atomic weight
1.4 Which of the following classifications of elements is NOT correct (is FALSE)?
A. Ba (Z = 56) is an alkali metal
B. As (Z = 33) is a metalloid
C. I (Z = 53) is a halogen
D. Kr (Z = 36) is a non-metal
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1.5 List the following ions in order of increasing ionic radius:
N3-, Na+, F-,Mg 2+, 0 2-
A. Na+, Mg2+, F-,0 2-, N3-
B. Mg 2+, Na+, F-,0 2-, N3-
C. F-,0 2-, N3-, Mg 2+, Na+
D. Mg2+, Na+, N3-, 0 2-, F-
1.6 Arrange the following atoms in order of increasing electronegativity:
Sb, I, Sn, Te
A. I, Te, Sb, Sn
B. Sb, I, Sn, Te
C. Sn, Sb, Te, I
D. Sn, Te, Sb, I
1.7 Give the condensed electron configuration of the following element: K+
A. ls 2 2s2 2p63s23p 64s1
B. [Ar] 4s1
C. ls 2 2s2 2p63s2 3p6
D. [Ar]
1.8 Balance the following equation by providing the missing coefficients:
_Al {0H)3 + _H2S04 _Ah (504)3 + _H20
A. 1, 3, 1, 2
B. 2, 3, 2, 6
C. 2, 3, 1, 6
D. 2, 6, 1, 3
1.9 Which statement about the noble gases is correct?
A. Noble gases are diatomic molecules.
B. Noble gases are reactive gases.
C. Noble gases have full outer electron shells.
D. The noble gases are found on the left-hand side of the Periodic Table.
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1.10 How many molecules are in 0.63 moles of molecules?
A. 8.3 x 1021molecules
B. 4.1 x 1026molecules
C. 3.8 x 1024molecules
D. 3.8 x 1023molecules
1.11 How many liters are required to make 800 ml of a 2.0 M H2S04solution, starting with a
6.0 M stock solution?
A. 26.1 L
B. 0.62 L
C. 0.26 L
D. 12.4 L
1.12 Which of the following combination of oxidation numbers is correct for the following
compound: Nal03?
A. Na= +1, 0 = -2, I= +5
B. Na= +1, 0 = -3, I= +S
C. Na = +2, 0 = -3, I = +6
D. Na= +1, 0 = -4, I= +3
1.13 The most electronegative element among the following is:
A. bromine
B. fluorine
C. oxygen
D. Sodium
1.14 Element X has a nucleon number of 20 and a proton number of 10. Which group in the
Periodic Table does it belong to?
A. I
B. Ill
C. VII
D. VIII
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1.15 What is the correct symbol for the lithium ion in lithium chloride?
A. ~u-
B. ~Li+
c. ~u+
D. 27L'L-
A. A.
B. B.
C. C.
D. D.
1.16 Table 1.1 shows the structure of different atoms and ions.
Table 1.1
Particle
Nucleon
Number of Number of Number of
Number
electrons
nuetrons
protons
Cl
35
17
V
17
c1-
35
w
18
X
Ca
40
20
y
20
Ca2+
40
z
20
20
What are the values of V, W, X, Y and Z in Table 1.2?
Table 1.2
V wX y z
A 18 17 18 20 20
B 18 18 17 20 18
C 17 16 16 20 22
D 18 17 17 20 16
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1.17 If 50.0 ml of gasohol has a mass of 37.5 g, what is the density of the gasohol in grams
per cubic centimetre?
A. 0.00750 g/cm 3
B. 0.0750 g/cm 3
C. 0.750 g/cm 3
D. 7.50 g/cm 3
1.18 The alcohol shown below is a:
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Allylic alcohol
1.19 What is the name of the following alkene according to the IUPAC rules?
CH3
I
A. 2-ethyl-3-pentene
B. 3-methyl-2-pentene
C. 3-methyl-3-pentene
D. 3- pentene -2- ethyl
1.20 A hydrocarbon with the general formula CnH2n-2 can be:
A. an alkyne
B. an alkyne or a cycloalkane
C. an alkyne or a cycloalkene
D. a cycloalkene
END OF SECTIONA
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SECTION B
QUESTION 2
2.1 Use your calculator to evaluate these expressions.
a) 4585 X 13 + 82
b) [(6.37 x 104) x (8.44 x 10-4)] + (3.2209 x 1015 )
c) 0.758 g + 3.10 g
[40]
[3]
2.2 Osteoporosis is a condition in which bone deteriorates to cause a decreased bone mass.
If a bone sample has a mass of 2.15 g and a volume of 1.40 cm3, what is its density in SI units
of density.
[4]
QUESTION 3
3.1 An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an isotope
with mass 205.9745 amu, 22.10% of an isotope with mass 206.9759 amu, and 52.40% of an
isotope with mass 207.9766 amu. Calculate the average atomic mass and identify the
element.
[4]
QUESTION 4
4.1 For each of the following species in Table 4.1 below determine number of protons,
neutrons and electrons.
[4]
Table 4.1
Neutrons
Electrons
Protons
s2cr3+
40Ar
39K+
19se2-
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QUESTION 5
5.1 Succinic acid is 40.7% C, 5.12% H, and 54.2% 0. If it has an experimental molar mass of
118 g, what are the:
a) empirical formula
[4]
b) molecular formula
[3]
QUESTION 6
6.1 Ammonia is produced from the reaction of nitrogen and hydrogen according to the
following balanced equation: Nz(g) + 3Hz(g) 2NH3(g).
From a mixture of 1.00 g N2 and 0.500 g H2:
a) Determine the limiting reagent.
[3]
b) What is the maximum mass of ammonia produced?
[3]
c) What is the mass of excess reactant that would remain unreacted?
[3]
d) If 0.986 g of ammonia is actually produced when an experiment is done, calculate the
percentage yield.
[2]
QUESTION 7
7.1 Define electronegativity.
[1]
7.2 Arrange the following atoms in order of increasing electronegativity:
[2]
N, Na, F, Mg, 0
7.3 One of the most useful features of the periodic table of the elements is that it allows
trends in the properties of the elements to be compared. Explain why
a) the alkali metals are all reactive.
[2]
b) the reactivity of the alkali metals increases down the group.
[2]
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1
M
2
r 3
Li Be
Udwm 8«Jtium
&.'41
,.012
JI
12
Na Mg
Sodi:rn
n.m
l4JOS
3
4
5
Periodic Table of the Elements
18
2
;1; 13
14
15
16
l 17
I
C
12.011
N
N.
I=
O
°"7Zffl
IS.ffl
F
flocmc
18."8
Ne
N
20~
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Amioam
STICl>l1 Pha-..phon,: Sul!ar
Cblon,e
hp
6
7
8
9
10
11
12
lU82
28.06&
30.,7-4
32.°'4
3H53
3'.ffl
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POOJ::U'ft
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Ca
Qlciurn
40,015
21Sc
Sa,,dum
+u~
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Si:rcntium Yttriom
~
a1.n aa.'°'
22Ti ~3 V
TltlmUm
47.88
S0.'42
Cr 25Mn 26Fe
Chromium 11»,p,ce
'""'
s1.m
soJa
ss.,33
27Co
C«,a!c
sa.,33
28Ni
Nod
sa."3
~9Cu ~oZn
Ccppcr
Zmc
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"5.3'
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"n2
Zr
Zira,c,ium
,i.224
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Nn~ '°'
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101.07
llhodim
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1002
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G~
12.&1
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r..
118.11
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Ar-.aiic:
74.m
51Sb
SeJefliam 8tcmine
1a.o,
1'-'0•
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u..K1Jl)COft
84.ao
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121.1'°
m.,
lodw,e
1u.'J04
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131.2,
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g7-71
72Hf
Ila"""'
tblnium
~
137327
rn.4,
~~H Ra
l\\a<ium
ll'-025
-103
AaiNdes
Rf
12"1
73Ta
T..,tuam
le0.'48
W ~5Re ~6Os
T~
l\\henun
o.mium
leJAS
18007
1'°-23
10D5 b ~06Sg
Ovbnium
(2'2]
12"]
10B7 h ~08Hs
&iv...... tm,;...,,
{l'-4)
£2''l
77 Ir 78Pt
Jriof,um l'bl:ioun
1'2.22
l,S.08
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Gold
1"-"7
Mcnu,y ThJ!lium
200.s, 204.383
u>d
207.2
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208.'80
Po
Folowm
('208.'92)
10M9 t 11O0 s ~IIRg 11C2 n 1U13ut ~14Fl ~IUS u ~16Lv
Heitnmlm
{l'8)
ll''l
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ll77J
(21!']
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l2'eJ
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A>bline
lbdon
,O,.ffl
222.018
1U17 us ~U18 uo
-..ptm> Ununoctium
.....,_,, ,aob,own
57La
l..\\nd,inQm
138.'°4
58Ce
Cerium
140.IIS
59Pr ~6N1 d Pm 62Sm
l"n:ocdFlimNtodymi<m l'romt1hium s.nmiurn
1..0.'°8
144.l-4 14013
ISOJ,
63Eu
E,,ropium
151."6
~s
Gd Tb
G:ido.'inium Terbi:ftl
157.25 158.tll
66Dy 67Ho
!>r.p,o<lum Hobun
lil.SO l'°'·')O
68 Er
&bun
"7.2'
6T9 m
Thdium
"a.,34
10Yb
Yaabi,,m
173.04
11Lu
i...tc.......
17•1."7
Th 91Pa ~2 U ~3Np Pu 9A5 m 9C6 m 97Bk 98Cf ~~00 Fm ~OMJ d 10N2 o r
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e.n.lion,
C>lilcffiiom
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.
~~
232.038 2ll.03'
238.02' 237.048 244.0"4 243.°'I
247.D70 247.070 lSl.090
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