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ICA511S - INTRODUCTION TO CHEMISTRY - 2ND Opp - JULY 2022 |
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nAmlBIA unlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF HEALTH, APPLIED SCIENCESAND NATURAL RESOURCES
Department of Agriculture and Natural Resources Sciences
QUALIFICATIONS: BACHELOROF AGRICULTURE
BACHELOROF HORTICULTURE
QUALIFICATIONS CODE:
07BAGA & 07BHOR
LEVEL: NQF LEVEL5
COURSE CODE: ICA511S
COURSE NAME: INTRODUCTIONTO CHEMISTRY
DATE: JULY 2022
SESSION: JULY
DURATION: 3 HOURS
MARKS: 120
EXAMINER:
MODERATOR:
SECOND OPPORTUNITY EXAMINATION QUESTION PAPER
MS. PAULINA NDINELAGO NAUPU
MRS. LUCIATUYENI-KELAOKAFIDI
INSTRUCTIONS
1. Answer all questions
2. Type clearly and neatly
3. Number the answers clearly
4. Report all your answers to the correct significant figures
PERMISSIBLE MATERIALS
1. Scientific calculator
ATTACHMENT:
1. Periodic Table
THIS QUESTION PAPERCONSISTSOF 4 PAGES(Excluding this front page)
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QUESTION 1
State three classification of matter and define them:
[6]
QUESTION 2
a) How many ml of 2.0M H2SO4are needed to make 400ml of 0.11M H2SO4_
[4]
b) 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]
c) Suppose you want to prepare 250.0 ml (that is, 0.2500 l) of 0.100 M CuSO4solution
by diluting a 1.00 M CuSO4stock solution. What volume of CuSO4do you need?
{4}
QUESTION 3
a) What is the mass in grams of 4.30 moles of Aluminum?
[3]
b) How many moles in 127.5 grams of sodium chloride?
[3]
c) How many moles are in 32.7 grams of ethanol (C2HGO)
[4]
QUESTION 4
a) 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 tells you?
[5]
b) You dissolve 152.5 g of CuCl2 in water to make a solution with a final volume of 2.25
L. What is its molarity?
[6]
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QUESTION 5
a) Name the formula of each of the following acids
[6]
i) Hydrosulfuric acid
ii) Iron {Ill) hydroxide
iii) Hydrophosphoric acid
b) Balance the following chemical equations
[8]
i) C + 502 ---+ C52+ CO
ii) Xe + F2---+ XeF6
iii) Ag + H25 ___,. Ag25 + H2
iv) FeCl3+ NaOH ....,.Fe(OH)3 + NaCl
c) Indicate the type of each of the following chemical reactions
[S]
i) 2Na+Clz ....,. 2NaCI
ii) H2C03 ....,. H20 + CO2
iii) 2KCI ....,. 2K + Clz
iv) 5+02 ....,. 502
v) CsH12+ 02....,. H20 +CO2
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QUESTION 6
30g of C3Hsburns in air to produce 70g of CO2.C3H8 + 502--+ 3 CO2+4H2O
[10]
a) Calculate the theoretical yield
{7}
b) Calculate the percent yield
{3}
QUESTION 7
Bicarbonate of soda (sodium hydrogen carbonate) is used in many commercial preparations.
Its formula is NaHCO3.Find the mass percentages (mass%) of Na, H, C, and O in sodium
hydrogen carbonate.
[10]
QUESTION 8
a) Determine the molecular formula of a compound with the empirical formula CF2and
a molar mass of 200 g/mol
[6]
b) A compound has empirical formula C2HsNand molar mass 86 g/mol. What is its
molecular formula?
[6]
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QUESTION 9
Consider the following equation: 2H2S+ 302---+2 S02 + 2 H20
[15]
a) How many moles of 02 are needed to combine with 8.4 moles of H2S
{5}
b) Starting with 9.2 moles of 02,
i) How many moles of H2Swill you need?
{5}
ii) How many moles of S02 will you get?
{5}
QUESTION 10
3.2 moles of N2reacts with 5.4 moles H2in the following chemical reaction:
[15]
a) What is the limiting reactant
{5}
b) How many moles of ammonia are formed
{5}
c) How much of the excess reactant is left over?
{5}
Total Marks:
120
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