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  2. When solid ammonium chloride, NH 4 Cl, is added to water, the temperature of the solution decreases. Which statement best describes this observation?

When solid ammonium chloride, NH 4 Cl, is added to water, the temperature of the solution decreases. Which statement best describes this observation?

 

PART A MULTIPLE CHOICE (KNOWLEDGE – 3O)

Identify the letter of the choice that best completes the statement or answers the question.

  1. Which of the following is the electron configuration for neon?
  2. 1s 2 2s 2 2p 4 3s 2 d. 1s 3 2s 3 2p 4
  3. 1s 1 2s 1 2p 6 3s 2 e. 1s 2 2s 2 2p 8
  4. 1s 2 2s 2 2p 6
  5. Iron forms a common ion with a charge of +3. The electron configuration of this ion is:
  6. 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
  7. 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
  8. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 8
  9. Which of the following is true of orbitals?
  10. They are two-dimensional paths around the nucleus.
  11. They can contain maximum of two electrons.

SCH 4U – Final Exam

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

III. hydrogen bonding

SCH 4U – Final Exam

  1. covalent bonding
  2. I only d. I, III and IV only
  3. I and IV only e. I, II and III only
  4. I and III only
  5. 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?
  1. 0.88 kJ d. 250 kJ
  2. 7.0 kJ e. 0.07 kJ
  3. 130 kJ
  4. When solid ammonium chloride, NH 4 Cl, is added to water, the temperature of the solution decreases. Which statement best describes this observation?
  1. The reaction is exothermic
  2. Heat is released from the system, so it feels cooler.
  3. NH 4 Cl (s) ! NH 4 Cl (aq) + 33.6 kJ
  4. NH 4 Cl (s) ! NH 4 Cl (aq) “#$”%”&”()”*+”
  5. NH 4 Cl (s) + H 2 O (l) ! NH 4 Cl (aq) “#,”%”-“”()”*+
  6. The presence of a catalyst is thought to increase the rate of a reaction by
  7. changing the products that are formed in the reaction
  8. decreasing the enthalpy change of the reaction
  9. increasing the enthalpy change of the reaction
  10. decreasing the activation energy of the reaction
  11. increasing the activation energy of the reaction
  12. 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. 1.9 x 10 -7 d. 2.3 x 10 -17
  2. 6.0 x 10 -11 e. none of the above
  3. 1.2 x 10 -10

SCH 4U – Final Exam

  1. The following diagram represents a kinetic energy distribution at two temperatures. In comparing the two temperatures, it is obvious that
  1. d.
  2. e. cannot be determined

c.

  1. 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?

  1. the mixture gets darker d. the mixture gets lighter
  2. the mixture gets darker then lighter
  1. none of the above
  2. the mixture get lighter then darker
  3. 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?
  1. 4.0 x 10 -4 d. 2.5 x 10 -11
  2. 3.4 e. 2.0 x 10 -4
  3. 0.29
  4. The organic compound aniline (C 6 H 5 NH 2 ) acts as weak base. What is the chemical formula of aniline’s conjugate acid?
  5. C 6 H 5 COOH d. OH ─
  6. C 6 H 5 NH ─ e. C 6 H 5 NH 3+
  7. H 3 O +

SCH 4U – Final Exam

  1. Bronsted-Lowry defined a base as
  2. a substance that releases H + d. a proton acceptor
  3. a substance that releases OH ─ e. an electron pair acceptor
  4. a proton donor
  5. The oxidation number of chromium (Cr) in the dichromate ion (Cr 2 O 72─ ) is
  6. +2 d. +7
  7. +4 e.
  8. +6
  9. 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)

  1. MnO 4─ d. Mn 2+
  2. C 2 O 42─ e. CO 2
  3. H +
  4. Given the following half-cell reactions:

Fe 2+(aq) + 2e ─

 


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