PART A MULTIPLE CHOICE (KNOWLEDGE – 3O)
Identify the letter of the choice that best completes the statement or answers the question.
Which of the following is the electron configuration for neon?
1s 2 2s 2 2p 4 3s 2 d. 1s 3 2s 3 2p 4
1s 1 2s 1 2p 6 3s 2 e. 1s 2 2s 2 2p 8
1s 2 2s 2 2p 6
Iron forms a common ion with a charge of +3. The electron configuration of this ion is:
1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 d. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 6
1s 2 2s 2 2p 6 3s 2 3p 6 3d 9 e. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 3
1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 8
Which of the following is true of orbitals?
They are two-dimensional paths around the nucleus.
They can contain maximum of two electrons.
SCH 4U – Final Exam
Their shapes are predicted by Bohr’s equation.
all of the above
none of the above
Which of the following is the electron configuration for the fluoride ion, F ─ ?
1s 2 2s 2 2p 4 d. 1s 2 2s 2 2p 6
1s 2 1p 6 e. 1s 2 2s 2 2p 6 3s 1
1s 2 2s 2 2p 5
In bonding orbital theory, a carbon-carbon triple bond consists of
3 pi bonds d. 1 sigma bonds + 4 pi bonds
1 sigma bond + 2 pi bonds e. 3 sigma bonds
2 sigma bond + 3 pi bonds
A substance is a brittle crystal that conducts electricity in molten liquid state only.
Which type of substance is it?
metallic crystal d. molecular crystal
ionic crystal e. frozen gas
covalent crystal
Four pairs of covalently-bonded electrons surrounding a central atom will be
arranged
pyramidally d. linearly
spherically e. trigonally
tetrahedrally
The attractive forces that exist between atoms in liquid helium are known as
dipole-dipole forces d. hydrogen bonds
ion-dipole forces e. Van der Waals forces
covalent bonds
Which of these intermolecular forces exist in between water, H 2 O, molecules:
Van der Waals
metallic bonding
III. hydrogen bonding
SCH 4U – Final Exam
covalent bonding
I only d. I, III and IV only
I and IV only e. I, II and III only
I and III only
The molar heat of vaporization of water is 42 kJ/mol. How much energy is released
by the condensation of 3.0 g of water?
0.88 kJ d. 250 kJ
7.0 kJ e. 0.07 kJ
130 kJ
When solid ammonium chloride, NH 4 Cl, is added to water, the temperature of the solution decreases. Which statement best describes this observation?
The reaction is exothermic
Heat is released from the system, so it feels cooler.
NH 4 Cl (s) ! NH 4 Cl (aq) + 33.6 kJ
NH 4 Cl (s) ! NH 4 Cl (aq) “#$”%”&”()”*+”
NH 4 Cl (s) + H 2 O (l) ! NH 4 Cl (aq) “#,”%”-“”()”*+
The presence of a catalyst is thought to increase the rate of a reaction by changing the products that are formed in the reaction decreasing the enthalpy change of the reaction increasing the enthalpy change of the reaction
decreasing the activation energy of the reaction
increasing the activation energy of the reaction
In a saturated solution of lead(II) chloride, the concentration of chloride ion is
6.2 x 10 -4 mol/L. The Ksp of lead(II) chloride would be which of the following?
1.9 x 10 -7 d. 2.3 x 10 -17
6.0 x 10 -11 e. none of the above
1.2 x 10 -10
SCH 4U – Final Exam
The following diagram represents a kinetic energy distribution at two temperatures.
In comparing the two temperatures, it is obvious that
d.
e. cannot be determined
c.
A full syringe contains this equilibrium:
2 NO 2 (g) ⇌ N 2 O 4 (g)
brown gas colourless gas
Based on Le Chatelier’s principle, what would be observed when the syringe is used to compress this gas mixture?
the mixture gets darker d. the mixture gets lighter
the mixture gets darker then
lighter
none of the above
the mixture get lighter then darker
The pH of a solution of HCl was found to be 3.4. The concentration of HCl of this
solution (in mol/L) is which of the following?
4.0 x 10 -4 d. 2.5 x 10 -11
3.4 e. 2.0 x 10 -4
0.29
The organic compound aniline (C 6 H 5 NH 2 ) acts as weak base. What is the chemical
formula of aniline’s conjugate acid?
C 6 H 5 COOH d. OH ─
C 6 H 5 NH ─ e. C 6 H 5 NH 3+
H 3 O +
SCH 4U – Final Exam
Bronsted-Lowry defined a base as
a substance that releases H + d. a proton acceptor
a substance that releases OH ─ e. an electron pair acceptor
a proton donor
The oxidation number of chromium (Cr) in the dichromate ion (Cr 2 O 72─ ) is
+2 d. +7
+4 e.
+6
Which substance in the following reaction has undergone reduction?
MnO 4─(aq) + 5 C 2 O 42─(aq) + 16H +(aq) 2Mn 2+(aq) + 10CO 2(g) + 8H 2 O (l)
MnO 4─ d. Mn 2+
C 2 O 42─ e. CO 2
H +
Given the following half-cell reactions:
Fe 2+(aq) + 2e ─