Which of the following is the electron configuration for neon?

PART A MULTIPLE CHOICE (KNOWLEDGE – 3O)
Identify the letter of the choice that best completes the statement or answers the
question.
3. Which of the following is the electron configuration for neon?
a. 1s 2 2s 2 2p 4 3s 2 d. 1s 3 2s 3 2p 4
b. 1s 1 2s 1 2p 6 3s 2 e. 1s 2 2s 2 2p 8
c. 1s 2 2s 2 2p 6
4. Iron forms a common ion with a charge of +3. The electron configuration of this
ion is:
a. 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
b. 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
c. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 8
5. Which of the following is true of orbitals?
a. They are two-dimensional paths around the nucleus.
b. They can contain maximum of two electrons.

SCH 4U – Final Exam
c. Their shapes are predicted by Bohr’s equation.
d. all of the above
e. none of the above
6. Which of the following is the electron configuration for the fluoride ion, F ─ ?
a. 1s 2 2s 2 2p 4 d. 1s 2 2s 2 2p 6
b. 1s 2 1p 6 e. 1s 2 2s 2 2p 6 3s 1
c. 1s 2 2s 2 2p 5
7. In bonding orbital theory, a carbon-carbon triple bond consists of
a. 3 pi bonds d. 1 sigma bonds + 4 pi bonds
b. 1 sigma bond + 2 pi bonds e. 3 sigma bonds
c. 2 sigma bond + 3 pi bonds
8. A substance is a brittle crystal that conducts electricity in molten liquid state only.
Which type of substance is it?
a. metallic crystal d. molecular crystal
b. ionic crystal e. frozen gas
c. covalent crystal
9. Four pairs of covalently-bonded electrons surrounding a central atom will be
arranged
a. pyramidally d. linearly
b. spherically e. trigonally
c. tetrahedrally
10. The attractive forces that exist between atoms in liquid helium are known as
a. dipole-dipole forces d. hydrogen bonds
b. ion-dipole forces e. Van der Waals forces
c. covalent bonds
11. Which of these intermolecular forces exist in between water, H 2 O, molecules:
I. Van der Waals
II. metallic bonding
III. hydrogen bonding

SCH 4U – Final Exam
IV. covalent bonding
a. I only d. I, III and IV only
b. I and IV only e. I, II and III only
c. I and III only
12. 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?
a. 0.88 kJ d. 250 kJ
b. 7.0 kJ e. 0.07 kJ
c. 130 kJ
13. When solid ammonium chloride, NH 4 Cl, is added to water, the temperature of the
solution decreases. Which statement best describes this observation?
a. The reaction is exothermic
b. Heat is released from the system, so it feels cooler.
c. NH 4 Cl (s) ! NH 4 Cl (aq) + 33.6 kJ
d. NH 4 Cl (s) ! NH 4 Cl (aq) “#$”%”&”()”*+”
e. NH 4 Cl (s) + H 2 O (l) ! NH 4 Cl (aq) “#,”%”-“”()”*+
14. The presence of a catalyst is thought to increase the rate of a reaction by
a. changing the products that are formed in the reaction
b. decreasing the enthalpy change of the reaction
c. increasing the enthalpy change of the reaction
d. decreasing the activation energy of the reaction
e. increasing the activation energy of the reaction
15. 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?
a. 1.9 x 10 -7 d. 2.3 x 10 -17
b. 6.0 x 10 -11 e. none of the above
c. 1.2 x 10 -10

SCH 4U – Final Exam
16. The following diagram represents a kinetic energy distribution at two temperatures.
In comparing the two temperatures, it is obvious that
a. d.
b. e. cannot be determined
c.
17. 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?
a. the mixture gets darker d. the mixture gets lighter
b. the mixture gets darker then
lighter
e. none of the above
c. the mixture get lighter then darker
18. 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?
a. 4.0 x 10 -4 d. 2.5 x 10 -11
b. 3.4 e. 2.0 x 10 -4
c. 0.29
19. The organic compound aniline (C 6 H 5 NH 2 ) acts as weak base. What is the chemical
formula of aniline’s conjugate acid?
a. C 6 H 5 COOH d. OH ─
b. C 6 H 5 NH ─ e. C 6 H 5 NH 3+
c. H 3 O +

SCH 4U – Final Exam
20. Bronsted-Lowry defined a base as
a. a substance that releases H + d. a proton acceptor
b. a substance that releases OH ─ e. an electron pair acceptor
c. a proton donor
21. The oxidation number of chromium (Cr) in the dichromate ion (Cr 2 O 72─ ) is
a. +2 d. +7
b. +4 e.
c. +6
23. 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)
a. MnO 4─ d. Mn 2+
b. C 2 O 42─ e. CO 2
c. H +
24. Given the following half-cell reactions:
Fe 2+(aq) + 2e ─

Last Completed Projects