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Exam
Subject
NAME
Date
Third Evaluation
CHEMISTRY
Time
09./03/2023
1hour30mins
Class
Coef
N0
LSS
5
Answer all the questions in the spaces provided
"A region of space in which there is a high
probability of finding an electron" is the
definition of
A. Atomic volume
B. Orbital
C. Shell
D. Quantum shell
2. The scientist whose alpha-particle
scattering experiment led him to conclude
that the nucleus of an atom contains a dense
center of positive charge is?
A. James Chadwick
B. Ernest Rutherford
C. JJ Thomson
3. After 96.8 days, a radioisotope; Th-234
decays to 1/16th its original value. The
half-life of the radioisotope is
A. 6.05 days.
B. 24.2 days
C. 2.24 days
D. 14.625 days
4. The daughter isotope produced by the beta
1.
decay of
234
90
8.
Which method is used to determine a particular
functional group in an organic compound
A. IR spectroscopy
B. NMR spectroscopy
C. Mass spectrometry
D. Ultra violet spectroscopy
What is the name given to the species (CH3)3C+
A. Carbanion
B. B cation
C. Free radical
D. Carbanium
Which of the following is not an electrophile
A. AlCl3
B. BCl3
C. NH3
D. Br+
The purity of a solid organic compound can be
determined using
A. Its Melting point
B. Mass spectrometry
C. Infra red spectroscopy
D. Empirical formula calculations
The hybridization which gives rise to covalent
compounds with linear shapes is
A. SP3
B. SP
C. SP2
D. B and C
Which of the following is not a nucleophile
A. OHB. CNC. NH3
D. BF3
Which of the following represents a saturated
hydrocarbon
10.
Th
11.
Ac
A. a)
Pa
B. b)
C. c) U
D. d) Ra
5. John Dalton It is not a property of cathode rays
15.
. Rutherford’s gold foil experiment added
to our knowledge of atomic structure.
How?
A. Determined the charge on an electron,
B. Determined the charge to mass ratio
of the electron,
C. Determined that the atom has a
central “core” or nucleus,
D. Discovered the planetary model of
the atom.
9.
230
89
234
91
234
92
230
88
6.
7.
12.
A] travel in straight lines towards the cathode
B]cast shadows of objects in their path
C] can cause a padlle wheel to rotate
D] are deflected in an Electric field
The correct sequence of processes occurring in the
mass spectrometer are
A] ionization, vaporization, Deflection,
Acceleration
B]vaporization acceleration, detection deflection
C] Ionisation , vaporization, acceleration deflection
D] Vaporisation, Ionisation, Acceleration,
deflection
A] C8H18 B] C3H6
C] C2H2
The type of reaction represented by
C3H6 +HCl →
C3H7Cl
is
13.
14.
D] CH2
ABCD
16.
17.
18.
19.
20.
21.
22.
A]Nucleophilic addition B] free radical substitution
C] Electrophilic Addition D] SN2
ABCD
The most volatile compound in the least is
A] Pentane B] 2-methylbutane C] 3-methylbutane D] 2,2-methylpropane
ABCD
The type of reaction represented by
C3H6 +Br2 → C3H6Br2
A]Nucleophilic addition B] free radical substitution
C] Electrophilic Addition D] SN2
ABCD
Which of the following hydrocarbon will undergo an addition reaction
A] CH4
B] C3H8
C] C4H8
D] C5H12
ABCD
`
Which of the following pair cannot be produce from cracking of C7H16
A] C2H4 and C5H12 B] C3H6 and C4H10
C] C5H10 and C3H6
D] C3H8 and C4H8
ABCD
In the compound CH3CH(CH3) CH3CH=CH2 The hybridization in the first and second carbon atom is
A] sp2 and sp2B] sp1 and sp2 C] sp and sp3 D] sp2and sp
ABCD
The statement which is not true about hydrocarbons is that
A] they are all saturated compounds
B] they are all organic compounds
C] they contain carbon and hydrogen only D]they could be gases, liquids or solids
ABCD
CH3CH=CH2 and CH3CH3 can be distinguish using
A] NH3/AgNO3
B] Iodoform C] Bromine water
D markovnikov rule
ABCD
23. The particle that is most likely to be detected during the determination of the Relative atomic mass of Chlorine is
(A) Cl+
(B) Cl-
(C) Cl
(D)Cl2
onisation energy is important in establishing electronic structure.
(i)
Define the term first ionisation energy.
……………………………………………………………………..…………..........................
……………………………………………………………………………………………………
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(ii)
Write an equation to represent the first ionization energy of chlorine.
…………………………………………………………………………………………………
…………………………………………………………………………………………(2mks)
1. (d) Electrons in are always moving round the nucleus in atomic orbitals which have fixed energy levels.
The hydrogen emission spectrum provides evidence for the existence of energy levels and how ionisation
energies can be obtained from it.
a. What is an atomic orbital?
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
(1mark)
b. The emission spectrum is often seen as a series of lines
i. How are these lines produced?
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
………………………………………
ii. What does each line in the series represents?
…………………………………………………………………………………………………………………
………………………………………………………………………………………
iii. Why are there several lines in the series?
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
iv. State two information about the structure of an atom that can be obtained from the atomic emission
spectrum
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
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v. Sketch a diagram to show the line emission spectrum of atomic hydrogen and indicate the direction of
increased wavelength.
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
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c. Write the electron in box configuration of the
i. Cr atomic number 24
……………………………………………………………………………………………………….
ii. X atomic number 34
………………………………………………………………………………………………………
2.
Complete the table below concerning spectroscopic techniques
Spectroscopic Technique
Nuclear magnetic resonance
Information obtained
Accurate values of Molar mass of a compound
Ultra-violet spectroscopy
Infra red spectroscopy
i. Draw the structure of 3-ethyl-2,5-dimethylhexane?
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
3.
Ngah Lidwine /Litika Clay
4. Remain Blessed And Strive To Be Happy