HSC511S - HEALTH SCIENCE CHEMISTRY - 2ND OPP - JULY 2022 :: NUST past examination papers between 2020 and 2024

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HSC511S - HEALTH SCIENCE CHEMISTRY - 2ND OPP - JULY 2022

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2 Pages 11-20

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HSC511S - HEALTH SCIENCE CHEMISTRY - 2ND OPP - JULY 2022

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nAmlBIA unlVERSITY

OFSCIEnCE Ano TECHn OLOGY

FACULTYOF HEALTH,APPLIEDSCIENCESAND NATURALRESOURCES

DEPARTMENTOF HEALTHSCIENCES

QUALIFICATION:BACHELOROF ENVIRONMENTALHEALTHSCIENCES

BACHELOROF HEALTHINFORMATION SYSTEMSMANAGEMENT

BACHELOROF BIOMEDICALSCIENCES

QUALIFICATIONCODE: 08BEHS

07BHIS

LEVEL: 5

S0BBMS

COURSECODE: HSCSllS

COURSENAME: HEALTH SCIENCECHEMISTRY

SESSION:JULY 2022

DURATION: 3 HOURS

PAPER:THEORY

MARKS: 100

SUPPLEMENTARY/SECONDOPPORTUNITYEXAM

EXAMINER(S} Mr DAVID CARELSE

MODERATOR: Dr MARIUS MUTORWA

INSTRUCTIONS

1. Answer ALL the questions in the answer book provided.

2. Write clearly and neatly.

3. Number the answers clearly.

4. All written work MUST be done in blue or black ink.

PERMISSIBLEMATERIALS

1. Scientific Calculator

THIS QUESTION PAPERCONSISTSOF 13 PAGES

(Including this front page, useful constants and Periodic Table)

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SECTIONA: MULTIPLE CHOICEQUESTIONS

[60]

• There are 20 multiple choice questions in this section. Each question carries 3 marks.

• Answer ALL questions by selecting the letter of the correct answer.

1. Convert 12300 to scientific notation.

A. 1,2300

B. 1.23 X 10·4

C. 1.2300 X 104

D. 1.23 X 104

2. Assuming all numbers are measured quantities, do the indicated arithmetic, and give

the answer to the correct number of significant figures.

4.18 - 58.16 X (3.38-3.01)

A. -17.0

B. -21.0

C. -19.0

D. -0.16

3. How many feet long is a 5 km indoor race?

A. 14408 ft

B. 17025 ft

C. 16408 ft

D. 15435 ft

4. The hottest place on record is said to have reached a temperature of 134° F. What is

this temperature reading in Kelvin?

A. 279.2 K

B. 349.2 K

C. 329.9 K

D. 314.4 K

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5. 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

6. Which of the following set of quantum numbers is allowed:

A. n = 2, 1=1, ml= -1, ms=-1

B. n = 5,J=-4, mJ= 2, ms=+1/2

C. n = 3,1=1, ml= 2, ms=-1/2

D. n=4,l=l,ml=l,ms=+l/2

7. Give the full electron configuration of the following element: ca+2

A. 1s2 2s2 2p6 3s2 3p64s2

B. 1s2 2s2 2p6 3s2 3p6

C. 1s1 2s2 2p6 3s2 3p6 4s1

D. 1s2 2s2 2p5 3s2 3p6

8. Balance the following equation by providing the missing coefficients:

_Al (OHh + _H2S04 _Ah (S04}3 + _H20

A. 1, 3, 1, 2

B. 2, 3, 2, 6

C. 2, 3, 1, 6

D. 2, 6, 1, 3

9. How many moles are in 4.6 x 1024 of sulfur atoms?

A. 2.8 moles

B. 7.6 moles

C. 6.7 moles

D. 76.0 moles

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10. How many grams of Na2SO4,are required to make 0.350 L of 0.500 M Na2SO4?

A. 24.9 g Na2SO4

B. 23.4 g Na2SO4

C. 34.9 g Na2SO4

D. 28.9 g Na2SO4

11. 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= +5

C. Na= +2, 0 = -3, I= +6

D. Na= +1, 0 = -4, I= +3

12. Name the two phases of a colloidal system.

A. Dispersion and dispersed phase

B. The two phases cannot be distinguished

C. Continuous phase and discontinuous phase

D. A and C

13. What is the molality of a solution that contains 128g of methanol (CH3OH)in 108g of

water?

A. 26m CH3OH

B. 47m CH3QH

C. 37m CH3QH

D. 39m CH3OH

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14. Which one of the following name-formula combinations is NOTcorrect?

A. Mercury (I} nitrate, HgNO3

B. Calcium phosphate, Ca3(PO4}2

C. Copper (II} sulfate pentahydrate, CuSO4·5H2O

D. Hydrofluoric acid, HF(aq)

15. What is the freezing point of a solution that contains 8.50 g of benzoic acid

(CGHsCOOHM, W= 122} in 75.0 g of benzene, C5H5?(fp=5.48; kt=5.12}

A. 0.72°C

B. 4.76 °C

C. 2.34°C

D. 1.76 °C

16. What is the name of the following alkene according to the IUPAC rules?

CH3

CH3- CH2- C = CH- CH3

A. 2-ethyl-3-pentene

B. 3-ethyl-2-pentene

C. 3-methyl-2-pentene

D. 3- pentene -2- ethyl

17. If 0.00251 mol of NH3effuse through a hole in 2.47 min, how much HCIwould effuse

in the same time?

A. 0.0017 Moles

B. 1.4643 Moles

C. 0.0251 Moles

D. 0.1701 Moles

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18. In general, colloidal particles remain dispersed because of

A. their size.

B. their rapid motion.

C. their electric charge.

D. the reduction in viscosity continuous phase.

19. From the following thermochemical equation, how much heat is created in 79.2 g 02?

CH4(g) + 202 (g) _. CO2(g) + 2H20 (I) ~H - 890.4 kJ

A. -1204 kJ

B. - 2402 kJ

C. - 1102 kJ

D. - 2204 kJ

20. How many moles are there in 36.0g of C?

A. 4.1 moles C

B. 3.0 moles C

C. 3.2 moles C

D. 3.4 moles C

END OF SECTIONA

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SECTIONB

[40]

• There are 7 questions in this section. Answer all Questions.

• Show clearly, where necessary, how you arrive at the answer as the working will carry

marks too.

Question 1

[3]

Gallium has two naturally occurring isotopes, 69Ga and 71Ga with masses of 68.9257 amu and

70.9249 amu, respectively. Calculate the percent abundances of these isotopes of gallium.

The average atomic weight of gallium is 69.723 amu.

Question 2

Caffeine has an elemental analysis of 49.48% carbon, 5.190%, hydrogen, 16.47% oxygen, and

28.85% nitrogen. It has a molar mass of 194.19 g/mol.

A. What is the empirical formula of caffeine?

[4]

B. What is its molecular formula?

[2]

Question 3

In a process for producing acetic acid, oxygen gas is bubbled into acetaldehyde, CH3CHO,

containing manganese (II) acetate under pressure at 60°C.

In a laboratory test of this reaction, 20.0 g CH3CHOand 10.0 g 02 were put into a reaction

vessel.

A. How many grams of acetic acid can be produced by this reaction from

these amounts of reactants?

[3]

B. How many grams of the excess reactant remain after the reaction is complete?

[2]

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C. If you obtain 23.8 g of acetic acid from the experiment, what is the percentage yield

of acetic acid?

[1]

Question 4

[8]

The breatholyzer test for blood alcohol requires breathing into a tube containing a gel

impregnated with an acidic solution of potassium dichromate. Alcohol in the breath will be

oxidized to CO2, and the yellow dichromate will be reduced to the green chromium (Ill) ion.

Balance the following equation which represents the redox process:

Question 5

[7)

Several methods are applied in practice to control settling and formation of dilatants "clays"

in colloidal dispersions such as pharmaceuticals, paints, agrochemicals and cosmetics. Briefly

discuss the role of the following in colloid stability of such dispersions:

A. Viscosity of dispersion medium:

B. Size of colloidal particles:

C. Brownian motion:

D. Concentration of the dispersion:

Question 6

210.0 g of the nonvolatile solute sucrose (C12H22011i)s added to 485.0 g of water at 25.0°C.

What will be the pressure of the water vapor over this solution? (The vapor pressure of pure

water is 23.8 torr at 25.0 °C.)

A. Determine the moles of water and sucrose:

[2]

B. Determine the mole fraction of the solvent:

[2]

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C. Determine the vapor pressure:

[1]

Question 7

[S]

Briefly describe the following terms?

A. Electron Affinity:

B. Colligative property:

C. Colloidal particle:

D. Accuracy:

E. Solubility:

THE END

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USEFULCONSTANTS:

Gas constant, R

= 8.3145 J . moI·1. K·1

= 0.083145 dm 3 • bar. moI·1 • K·1

= 0.08206 L atm moI·1 • K·1

1.609km = 1mile

1 Pa . m3 = 1 kPa.L = 1 N • m = 1 J

1 atm = 101 325 Pa = 760 mm Hg= 760 torr

Avogadro's Number, NA= 6.022 x 1023 mol·1

1 kg= 2.2 lb

Planck's constant, h = 6.626 x 10-34 Js

1mile = 5280ft

Speed of light, c = 2.998 x 108 ms·1

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2.1 Page 11

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Periodic Table of the Elements

r.; r2!.t,

,.012

-1,-~,.-,2--,

Na Mg

· r~ 13

! ·£ ,~

'"""

11·!1..

10.811

12.011

(4.007

,~,,,

i8.ffl

20.180

1-4

[]6

Al Si P S Cl Ar

n..m 2~..)0S

12 Km :.a.~ J0.'74

,s.m L.2'.HS

19 K

"-""""

:,,.o,e

37Rb

&-1."8

20Ca 21Sc

C>!'0<m 5aao,,m

40.078 40S4

38Sr 39 Y

87.42

SS.'°'

22Ti []) V ~-4Cr ~5Mn 26Fe

r,cw;,,a V.~

,,,,..

-0..es so.,.2 s1.m so>a ~.,,,

-40Zr -4N1 b ~2Mo ~3Tc

,r_u4

,u°' ,S."4

1007

101.07

27Co

c«,,lt

sun

102.'°'

28Ni 29Cu

Nid.d

Cower

su,> u~

'46Pd -4A7 g

IOC..42 107.$48

30Zn

,s.,,

~8Cd

IIHI I

JIGa

G:al5<m

3<2G;.,e,,..).3.hA.-~.,s,

01n

n.41 1021

-49In SOSn 51Sb

IIUIII

118.71 111140

Sdc......

79.0,

S2Te

127.4

35Br r.6Kr

Krr,,<oo

=:!'-'04 &4.80

Xe []3 I

S-4

12U04

5SCs

C,.....,

nuos

56Ba

&nom

1)7.327

57-71

Hf Ta W Re Os Ir 72

Hz!o....,T..,,....,,. T~a

~....,,.

0--

l,ldlu,m

176.4' u,o.'4& 1e.>.as 1M.201 t'°-ll

1'1.22

7P8P'bt.....7.,9A.Golu4 80Hg ~I Tl

1,s.oa

19'.K7

lOO.S' 2~.l&l

82Pb

t..>d

201.2

83Bi r£]P~5o

~ob,it:;oo

20a.,eo (lllUe'lJ

ktltiae

20'."7

m.o1e

Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Uut Fl Uup Lv Uus Uuo 88

89-103 10-4 105 ~06 ~07

108 ~09

110 111 112 113 11'4 115 ~16

117 118

Aci•••d« ~""

o..i..;.,,.

&i,,m H,:....,.

u-,,,,_ flt- u..._.....·,

~"'""'<;>tu:> u...,.,.,...,...

124..0lS

(141)

(l'2)

(lU)

(2«)

(10)

[l~J

(lOJ

[1n)

[277)

(lm)

fl'$)

--..

......,_

138.'°'

C«Mn

14'l.ll5

.A..,.c......nT..onh-

227-Cm lJl.OJS

If~.,,.

l«UOS

2)1.0)4

144.24

Sm Eu

s.m.,....,

IS0.3(

151."4

157.U

Tc,t,i,m

i~ru

u 92

u,,,.,;,,,,,

1:ism,

2)7.~

,.P.,.u.,,.,"_A-1iomum

c..,.,...

2+W'4

24).041 M7.1)7Q M1.010

ODr.y.,...,H.Ho_hwoffl

1'250

1~0)4

C.:kn<m

m,oeo

&,=1Mm

[lS4J

frl>m

1,1.2'

Th,6,n

1~,34

Yt:crl>m

l7HH

100

IOI

102

FF.m,.,..I."~.M. d No

:mms lSS.I

2S'-'01

IP.w.m

170(7

103

[Ul)