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ICA511S - INTRODUCTION TO CHEMISTRY - 2ND OPP - JULY 2023 |
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nAm I BI A un IVERS ITY
OF SCIEnCE AnDTECHnOLOGY
FACULTYOF HEALTH,NATURAL RESOURCESAND APPLIEDSCIENCES
SCHOOLOF AGRICULTUREAND NATURALRESOURCESSCIENCES
DEPARTMENTOF AGRICULTURALSCIENCESAND AGRIBUSINESS
QUALIFICATIONS:BACHELOROF SCIENCEIN AGRICULTURE
BACHELOROF SCIENCEIN HORTICULTURE
QUALIFICATIONSCODE: 07BAGA
07BHOR
LEVEL: 7
COURSECODE: ICASllS
COURSENAME: INTRODUCTION TO CHEMISTRY
SESSION:
JULY 2023
PAPER:
THEORY
DURATION: 3 HOURS
MARKS:
120
EXAMINER:
MODERATOR:
SECONDOPPORTUNITYEXAMINATION QUESTION PAPER
MS. PAULINA NDINELAGO NAUPU
MRS. LUCIA TUYENI-KELAO KAFIDI
INSTRUCTIONS
1. Answer all the questions.
2. Write neatly and clearly.
3. Mark all answers clearly with their respective question numbers.
4. All written work MUST be done in blue or black ink.
5. No books, notes and other additional aids are allowed.
PERMISSIBLEMATERIALS
1. Calculator
2. Examination paper
3. Examination script
THIS QUESTION PAPERCONSISTSOF 4 PAGES(ExcludingThis Front Page)
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QUESTION 1
Write the name/formula of the following:
1.1 HBr
{2}
1.2 HNO3
{2}
1.3 H2SO3
{2}
1.4 Potassium hydroxide
{2}
[8]
QUESTION 2
2.1 How many ml of 2.0M H2SO4are needed to make 400ml of 0.llM H2SO4
{4}
2.2 24.6 ml of a 0.S0M monoprotic acid solution was titrated with a 0.18M NaOH solution
What is the volume of NaOH that should be added to the solution in order to reach the
equivalence point?
{4}
2.3 Suppose you want to prepare 250 ml of 0.100 M CuSO4solution by diluting a 1.00 M
CuSQ4stock solution. What volume of CuSO4do you need?
{4}
2.4 What is the mass of 0.30 moles Mg(NO3)2
{3}
[15]
QUESTION 3
3.1 A rock has a mass of 20.5 g and a volume of 15.05 cm3. What is its density?
{3}
3.2 A rock has a density of 18.3 g/cm 3. If you have a rock bar with a volume of
43.9 cm3, what is its mass?
{3}
[6]
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QUESTION 4
4.1 If a compound has an empirical formula of CH2and a molar mass of 84 g/mol, what is its
molecular formula
{6}
4.2 A compound has an empirical formula of C2Hsand a molar mass of 58 g/mol. What is its
molecular formula?
{6}
[12]
QUESTION 5
5.1 Consider copper (II) bromide CuBr2, calculate the percentage of copper and bromide
{6}
5.2 What mass of oxygen gas is required to completely react with 25.0 grams of iron to
produce iron(III) oxide, Fe 2 0 3 according to the following balanced equation: 4Fe + 302
2Fe2O3?
{5}
[11]
QUESTION 6
Balance the following equations
6.1 Fe2(SO4)3
K2SO4+ Fe (OH)3
{2}
6.2 Mg + N2 Mg3N2
{2}
6.3 C3Hs+
CO2+ H2O
{2}
[6]
QUESTION 7
Calculate the formula weight (FW) of the following substances.
7.1 CH3COOH
{2}
7.2
{2}
7.3 KMnO4
{2}
[6]
QUESTION 8
Calculate the percentage composition of carbon in the following substances.
8.1 C12H22O11
{5}
8.2
{5}
[10]
QUESTION 9
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2 moles of propane react with 8 moles of oxygen gas in a combustion reaction in the following
equation: lC3Hs +
3CO2+ 4H2O
9.1 What is the limiting reactant
{6}
9.2 How many moles of carbon dioxide are formed
{5}
9.3 How much of the excess reactant is left over?
{5}
[16]
QUESTION 10
10.1 Calculate the molarity of a solution prepared by dissolving 9.8 moles of solid NaOH
in enough water to make 3.62 L of solution. What does your answer tell you?
{6}
10.2 You dissolve 152.5 g of CuC'2in water to make a solution with a final volume
of 2.25 L. What is its molarity?
{6}
[12]
QUESTION 11
30g of C3Hsburns in air to produce 70g of CO2using the following reaction C3Hs+ 502
+4H2O.
11.1 Calculate the theoretical yield
3CO2
{7}
11.2 Calculate the percent yield
{3}
[10]
QUESTION 12
Draw the atomic structure of Sodium (Na}. Please indicate the number of electrons, neutrons,
and protons with their respective charges the element has.
[8]
Total Marks: 120
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1
18
1IA
1A
PeriodicTableof the Elements
VIIIA
SA
6
7
VIB VIIB
6B
7B
8
9
10
1 v~nl
11
IB
1B
17
VIIA
7A
-2
He
4.003
9
.,F_
11.111
-10
Ne
20.1IO
-17
Cl
3U53
18Ar
Atgon
31.94,1
-35Br 36Kr
lt.l04
-53
I
Ut.l04
54
Xe
x.-
131.214
-At - 85
86
Rn
211t.N7 m.011
T-Ts 117 118
Og
ll9CI 12941
Lanthanide
Series
AcUnlde
Series
57
58
59
60
61
62
La Pr Pm ,S._m Eu Tb Er Tm Yb Lu ...__
Ce
Nd
Cellcla p,._,,...,,_,_ -
...
131.11111 140.111 HQ.IOI 144JU
144.113 15031
-::JEr• -- - - -· • ___J!.•.::Jsr-:::::J.-::::::J1_t-a--1_.
63
151.114
64
Gd
157.25
65
T.,_
151.125
66
67
Dy Ho
112.IOO 114.130
68
117.lSt
69
70
71
TII-
L-
111.134 17:1.055 174.117
-:::J.-:::::Jr.r::::Jlii""':::::J!ii".'::l.:::Jr111-:::-::-J-lrl.1•