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HSC511S - HEALTH SCIENCE CHEMISTRY - 1ST OPP - JUNE 2022 |
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r
nAmI BI AunIVE RSITY
OF SCIEnCE Ano TECHn
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:JUNE 2022
DURATION: 3 HOURS
PAPER:THEORY
MARKS: 100
FIRSTOPPORTUNITYEXAMINATION QUESTION PAPER
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 10 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 ALLquestions by selecting the letter of the correct answer.
1. Write the following number 0.000004013 using scientific notation.
A. 4.013 X 10·6
B. 4.013
C. 4.013 X 106
D. 4.01 X 107
2. Do the following calculation and give the answer to the correct number of significant
figures
A. 0.36
B. 3.6
2.568 X 5.8
4.186
C. 3.558
D. 0.6
3. How many grams does a 65-lb. bag of cement weigh?
A. 39545 g
B. 29545 g
C. 45445 g
D. 24745 g
4. A toddler with a fever has a temperature of 103° F. What is this temperature reading
in Celsius?
A. 39.4° C
B. 37.1°C
C. 42.7° C
D. 35.3° C
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5. List the following ions in order of increasing ionic radius: N3-, Na+, F-, Mg 2+, 0 2-
A. Na+, Mg 2+, F-, 0 2-, N3-
B. Mg 2+, Na+, F-, 0 2-, N3-
C. F-, 0 2-, N3-, Mg 2+, Na+
D. Mg 2+, Na+, N3-, 0 2-, F-
6. Identify the electron with the following quantum numbers:
n=3; J = 2; mi= 1; ms=-½
A. 3d8
B. 3p9
C. 3d9
D. 2d9
7. Give the condensed electron configuration of the following element: K+
A. ls 2 2s2 2p63s2 3p64s1
B. [Ar] 4s1
C. ls 2 2s2 2p63s2 3p6
D. [Ar]
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
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9. How many molecules are in 0.77 moles of a substance?
A. 8.3 x 1021molecules
B. 4.1 x 1026molecules
C. 3.8 x 1024molecules
D. 4.6 x 1023molecules
10. How many grams of Na2SO4,are required to make 0.350 Lof 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 is the right combination of oxidation numbers for the following
compound: Mn201?
A. Mn=+2,O=+7
B. Mn= +14, 0 = -2
C. Mn=+7,O=-2
D. Mn= +2, 0 = -7
12. Which of the following are examples for colloidal systems in which the dispersed
phase is solid and the dispersion phase is gas?
A. Smoke, dust
B. Fog, liquid sprays
C. Milk, mayonnaise
D. None of the above
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13. What is the molality of a solution that contains 1208g of methanol (CH3OH)in 1208g
of water?
A. 26.25m CH3OH
B. 47.25m CH3OH
C. 37.25m CH3OH
D. 31.25m CH3OH'
14. From the following list select the elements that are metals:
I. Fe, II. S, Ill. Si, IV. Na, V. U, VI. Hg
A. 11,111
B. I, Ill, IV, V,
C. I, IV, V, VI
D. Ill, IV, V
15. What is the freezing point of a solution that contains 8.50 g of benzoic acid
(C5HsCOOH,MW= 122) in 75.0 g of benzene, (5H5? (fp=5.48; kf=5.12)?
A. 0.72°C
B. 4.76 °C
C. 2.34°(
D. 1.76 °C
16. What is the name of the following alkene according to the IUPAC rules?
CH3
I
CH3- CH2- C = CH- CH3
Br
A. 2-ethyl-4-bromo-But-2-ene
B. 5-bromo-3-methyl-pent-3-ene
C. 1-bromo-3-methyl-pent-2-ene
D. 5-bromo-hex-2-ene
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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
18. A gas is least soluble in a liquid at:
A. low temperature and low pressure.
B. high temperature and high pressure.
C. high temperature and low pressure.
D. low temperature and high pressure.
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. What is the osmotic pressure of a 0.0lM solution of glucose at 25°C?
A. 185.7 mmHg
B. 255.3 mmHg
C. 278.1 mmHg
D. 145.4 mmHg
END OF SECTION A
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SECTIONB
• 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.
[40]
Question 1
[3]
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.
Question 2
[6]
Ethylene glycol, the substance used in the automobile antifreeze and recently vape cartridges
fore-cigarettes, it is composed of 38.7% C, 9.7% H, and 51.6% 0 by mass. Its molar mass is
62.1 g/mol.
A. What is the empirical formula of ethylene glycol?
B. What is the molecular formula of ethylene glycol?
Question 3
[6]
In a process for producing silver, AgN03 solution and copper are reacted in an
electrochemical vessel producing Cu(N03)2 as a byproduct. The following equation
represents the overall reaction.
In a laboratory test of this reaction, 20.0 g Cu and 10.0 g AgN03 were put into a reaction
vessel.
A. How many grams of silver can be produced by this reaction from these amounts
of reactants?
B. How many grams of the excess reactant remain after the reaction is complete?
C. If you obtain 5.70 g of silver from the experiment, what is the percentage yield of
silver?
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Question 4
[8)
The following equation under acidic conditions represents a redox process involved in a
spectrophotometric determination of the permanganate ion. Balance the equation.
Question 5
[7)
State seven (7) factors affecting the stability of colloids
Question 6
[5)
If 0.340 mol of a non-volatile non-electrolyte are dissolved in 3.00 mol of water, what is the
vapor pressure of the resulting solution? (The vapor pressure of pure water is 23.8 torr at
25.0 °C.}
A. Calculate the mole fraction of the solvent
B. Calculate the vapor pressure
Question 7
[5)
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 = !mile
1 Pa . m3 = 1 kPa.L = 1 N • m = 1 J
1 atm = 101 325 Pa = 760 mmHg = 760 torr
Avogadro's Number, NA= 6.022 x 1023 moI-1
1 kg= 2.2 lb
Planck's constant, h = 6.626 x 10-34 Js
!mile = 5280ft
Speed of light, c = 2.998 x 108 ms-1
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