Chemical Bonding Past Paper Test

n **x** **Access to Medicine & Medical Biosciences** **[Unit 2 -- Chemical Bonding ]** **[Test]** Student name.......................................... Date....................................................... Group................................................... Chemical Bonding Test...

n **x** **Access to Medicine & Medical Biosciences** **[Unit 2 -- Chemical Bonding ]** **[Test]** Student name.......................................... Date....................................................... Group................................................... Chemical Bonding Test Time: 1 hour 15 minutes Instructions: Answer all questions. Write all your answers in the spaces provided. Use the Periodic Table provided. Section A: Multiple Choice Questions Which of the following electron configurations represents the ground state of an oxygen atom (atomic number 8)? a\) 1s² 2s² 2p⁶ b\) 1s² 2s² 2p⁴ c\) 1s² 2s² 2p³ d\) 1s² 2s² 2p⁶ Which of the following elements will form an ion with a 2- charge? a\) Magnesium b\) Oxygen c\) Sodium d\) Chlorine What is the shape of a molecule of carbon dioxide (CO₂)? a\) Tetrahedral b\) Linear c\) Trigonal Planar d\) Bent The bond angle in a molecule with a tetrahedral shape, like methane (CH₄), is approximately: a) 120° b\) 90° c\) 109.5° d\) 180° Which of the following properties is associated with metallic bonding? a\) Low melting points b\) High electrical conductivity c\) Formation of discrete molecules d\) Brittle and rigid structure Which of the following best describes the intermolecular forces present in iodine (I₂)? a\) Ionic bonds b\) Hydrogen bonds c\) London dispersion forces d\) Dipole-dipole forces Which of the following substances would have a giant ionic lattice structure? a\) Sodium chloride (NaCl) b\) Sulfur hexafluoride (SF₆) c\) Water (H₂O) d\) Phosphorus (P₄) Which of the following statements is true about covalent bonding? a\) Electrons are transferred between atoms. b\) Electrons are shared between atoms. c\) Metal atoms are involved in covalent bonds. d\) It only occurs between metals. What is the property of ionic compounds in terms of electrical conductivity? a\) Conductive in solid state b\) Conductive when dissolved in water c\) Non-conductive in any state d\) Conductive only at high temperatures Which of the following best describes the bonding in a molecule of nitrogen (N₂)? a\) Double covalent bond b\) Single covalent bond c\) Triple covalent bond d\) Ionic bond Section B: Write the electron configuration for the chloride ion (Cl⁻). \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Describe the shape of a molecule of ammonia (NH₃) and explain the bond angles. ( draw the dot and cross diagram). Define ionic bonding and give one example of a compound formed through ionic bonding. Explain why ionic compounds generally have high melting and boiling points. Explain why sodium chloride (NaCl) does not conduct electricity in its solid state but does in molten states. Explain why magnesium chloride (MgCl₂) has higher melting point than NaCl. What is a polar covalent bond? Give an example of a molecule with a polar covalent bond. Explain why water (H₂O) has a higher boiling point than hydrogen sulfide (H₂S). In your answer, refer to the types of intermolecular forces present. Explain the increase in boiling point from H2S to H2Te. 8. Metals such as aluminium are good conductors of electricity. Use the diagram below to explain how metals are able to conduct electricity. \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_