SCH 4U – Final Exam
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.
- 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
- 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
- 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
- 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 +
- 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 ─