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ICA511S - INTRODUCTION TO CHEMISTRY - 2ND OPP - JUNE 2025 |
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n Am I B I A u n IVER s I TY
OF SCIEnCE AnDTECHnOLOGY
FACULTYOF HEALTH,NATURALRESOURCESAND APPLIEDSCIENCES
SCHOOLOF AGRICULTUREAND NATURALRESOURCESSCIENCES
DEPARTMENTOF AGRICULTURALSCIENCEAND AGRIBUSINESS
QUALIFICATIONS:BACHELOR OF SCIENCEIN AGRICULTURE
BACHELOR OF SCIENCEIN HORTICULTURE
QUALIFICATIONSCODE: 07BAGA LEVEL:NQF LEVEL7
07BHOR
COURSECODE: ICA511S
COURSENAME: INTRODUCTION TO CHEMISTRY
DATE: JULY 2025
SESSION:JULY
DURATION: 3 HOURS
MARKS: 100
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 MARKING SCHEMECONSISTSOF 3 PAGES
(ExcludingThis Front Page)
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QUESTION 1
Define the following terms
1.1 Substance
{2}
1.2 Heterogeneous mixture
{2}
1.3 Paper chromatography
{2}
1.4 Centrifugation
{2}
1.5 Precision
{2}
1.6 Significant figure
{2}
[12]
QUESTION 2
For each of the following, identify it as either an ionic or a molecular compound. For
ionic, indicate the charges of each element.
2.1 H20
{2}
2.2 MgC'2
{2}
2.3 CO2
{2}
2.4 Fe203
{2}
2.5 Sr(OH}i
{2}
2.6 C6H1206
{2}
[12]
QUESTION 3
Give the correct name for the following ions:
3.1 Fe3+
{2}
3.2 soi-
{2}
3.3 Cu2+
{2}
3.4 N03-
{2}
3.5 NH4+
{2}
[10]
QUESTION 4
Write the chemical formula for the following compounds
4.1 Magnesium chloride
{2}
4.2 Aluminum sulfate
{2}
4.3 Ammonium phosphate
4.4 Copper (II) nitrate
4.5 Potassium permanganate
{2}
{2}
{2}
[10]
QUESTION 5
5.1 Arrange the following elements in order of increasing atomic radius: K, Li, Cs, Na.
Explain your reasoning.
{3}
]5.2 Which element has a higher first ionization energy, oxygen (0) or sulfur (S)?
Justify your answer.
{3}
5.3 Why is fluorine (F) more reactive than iodine (I) in terms of periodic trends?
{3}
[9]
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QUESTION 6
6.1 Consider copper (II} bromide CuBr2, calculate the percentage of copper and
bromide
{6}
6.2 What mass of oxygen gas is required to completely react with 25.0 grams of iron
to produce iron (Ill}oxide, Fe2O3according to the following balanced equation:
4Fe + 302 2Fe2O3?
{7}
[13]
QUESTION 7
2 moles of propane react with 8 moles of oxygen gas in a combustion reaction in the
following equation: lC3Hs +
3CO2+ 4H2O.
7.1 What is the limiting reactant
{7}
7.2 How many moles of carbon dioxide are formed
{4}
7.3 How much of the excess reactant is left over?
{6}
[17]
QUESTION 8
8.1 What is the molarity of a solution that contains 0.25 moles of glucose dissolved
in 500 ml of water?
{4}
8.2 How many milliliters of a 1.5 M solution of hydrochloric acid are needed to
prepare 500ml of a 0.25 M solution?
{4}
8.3 How many ml of 2.0M H2SO4are needed to make 400ml of 0.11M H2SO4_
{4}
8.4 What is the mass of 0.30 moles Mg(NO3}2
{5}
[17]
Total Marks:
100
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PERIODIC TABLE OF THE ELEMENTS
18
l
2
H
1.00794 2
13
14
15
16
17
He
4.00260
34
5 6 7 8 9 10
Li Be
B C N 0 F Ne
6.941 9.01218
10.81 12.01 I 14.0067 15.9994 18.9984 20.179
11 12
13 14 15 16 17 18
Na Mg
Al Si p s Cl Ar
22.9898 24.305 3
4
5
6
7
8
9
10
11
12 26.9815 28.0855 30.9738 32.06 35.453 39.948
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
K Ca Sc Ti V Cr Mn Fe Co. Ni Cu Zn Ga Ge As Se Br Kr
39.0983 40.08 44.9559 47.88 50.9415 51.996 54.9380 55.847 58.9332 58.69 63.546 6538 69.72 72.59 74.9216 78.96 79.904 83.8
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
Rb Sr y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
85.4678 87.62 88.9059 91.22 92.9064 95.94 (98) 101.07 102.906 106.42 107.868 112.41 114.82 118.69 121.75 127.6 126.9 131.29
w
55 56 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
Cs Ba Lu Hf Ta w Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
132.905 137.33 174.967 178.49 180.948 183.85 186107 190.2 192.22 195.08 196.967 200.59 204383 207.2 208.908 (209) (210)
87 88 103 104 105 106 107 108 109 110 111 112
114
116
Fr Ra Lr Rf Db Sg Bh Hs Mt Uun Uuu Uub
Uuq
Uuh
(223) 226.025 (260) (261) (262) (263) (264) '265) (268) (269) (272) (269)
(222)
118
Uuo
Lanthanides: 57 58 59 60 61 62 63 64 65 66 67 68 69 70
La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb
138.906 140.12 140.908 144.24 (145) 150.36 151.96 157.25 158.925 162.50 161.930 167.26 166.934 173.04
Actinide!!:
89 90 91 92 93 94 95 96 97 98 99 100 101 102
Ac Th Pa u Np Pu Am Cm Bk Cf Es Fm Md No
227.028 232.038 231.036 238.029 237.048 (244) (243) (247) (247) (251) (252) (257) (258} (259}