IB Chemistry 11 Kahoot! Review Q s Bonding
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1 IB Chemistry 11 Kahoot! Review Q s Bonding 1. What is the best description of the carbon-oxygen bond lengths in CO3 2-? A. One short and two long bonds B. One long and two short bonds C. Three bonds of the same length D. Three bonds of different lengths 2. What is the number of sigma and pi bonds and the hybridization of the carbon atom in: A. 4s, 1p, sp 2 B. 4s, 1p, sp 3 C. 3s, 2p, sp 3 D. 3s, 1p, sp 2 3. Which allotropes contain carbon atoms with sp 2 hybridization? I. Diamond II. Graphite III. C60 Fullerene D. I, II, and III 4. Based on electronegativity values, which bond is most polar? A. B C B. C O C. N O D. O F 5. What is the molecular shape and hybridization of the nitrogen atom in NH3? A. Tetrahedral, sp 3 B. Trigonal planar, sp 2 C. Trigonal pyramidal, sp 2 D. Trigonal pyramidal, sp 3 6. Which statement about sigma and pi bonds is correct? A. Sigma bonds are formed only by s orbitals and pi bonds are formed only by p orbitals. B. Sigma bonds are formed only by p orbitals and pi bonds are formed only by s orbitals. C. Sigma bonds are formed by either s or p orbitals, pi bonds are formed only by p orbitals. D. Sigma and pi bonds are formed by either s or p orbitals.
2 7. Which molecule is linear? A. SO2 B. CO2 C. H2S D. Cl2O 8. Why is the boiling point of PH3 lower than that of NH3? A. PH3 is non-polar, NH3 is polar B. PH3 is not hydrogen bonded, NH3 is hydrogen bonded C. van der Waal's forces are weaker in PH3 than in NH3 D. The molar mass of PH3 is greater than that of NH3 9. A molecule of ethanol contains covalent bonds, hydrogen bonds, and van der Waals forces. Which bonds or forces are broken when ethanol is vaporized? A. Only hydrogen bonds B. Covalent bonds and hydrogen bonds C. Covalent bonds and van der Waals forces D. Hydrogen bonds and van der Waals forces 10. Which statement best describes the attraction present in metallic bonding? A. The attraction between nuclei and electrons B. The attraction between positive ions and electrons C. The attraction between positive ions and negative ions D. The attraction between protons and electrons 11. Which statement is true for ionic compounds? A. They contain elements of similar electronegativity B. They conduct electricity in the solid state C. They are coloured D. They have high melting and boiling points 12. Which fluoride is the most ionic? A. NaF B. CsF C. MgF2 D. BaF2 13. Which statements correctly describes the NO2 ion? I. It can be represented by resonance structures. II. It has two lone pairs of electrons on the N atom. III. The N atom is sp 2 hybridized. D. I, II and III
3 14. In which substance is hydrogen bonding present? A. CH4 B. CH2F2 C. CH3CHO D. CH3OH 15. Which types of hybridization are shown by the carbon atoms in the compound CH2=CH-CH3? I. sp II. sp 2 III. sp 3 D. I, II and III. 16. Which molecule is polar? A. CO2 B. PF3 C. CH4 D. BF3 17. What are responsible for the electrical conductivity of metals? A. Delocalized positive ions B. Delocalized valence electrons C. Delocalized atoms D. Delocalized negative ions 18. The compounds listed below have very similar molar masses. Which one has the strongest IMFs? A. CH3CHO B. CH3CH2OH C. CH3CH2F D. CH3CH2CH3 19. What is the molecular geometry and the Cl I Cl bond angle in the ICl4 ion? A. Square planar, 90 B. Square pyramidal, 90 C. Tetrahedral, 109 D. Trigonal pyramidal, 107
4 20. What type of solid materials are typically hard, have high melting and boiling points, and poor electrical conductivity? I. Ionic II. Metallic III. Covalent-network D. I, II, and III 21. Which compound has the least covalent character? A. SiO2 B. Na2O C. MgCl2 D. CsF 22. How many sigma and pi bonds are present in the structure of HCN? s p A. 1 3 B. 2 3 C. 2 2 D How many lone pairs and bonding pairs of electrons surround xenon in the XeF4 molecule? Lone Bonding A. 4 8 B. 0 8 C. 0 4 D Which of the following pairs will fully dissolve in each other? A. Hexane and sodium chloride B. Ethanol and water C. Water and hexane D. Ethanol and sodium chloride 25. Covalent compounds generally have low melting and boiling points because their: A. Intermolecular forces are strong B. Intramolecular forces are strong C. Intermolecular forces are weak D. Intramolecular forces are weak 26. Which of the following pairs will have the strongest London (dispersion) forces: A. Iodine and butane B. Chlorine and butane C. Chlorine and ethane D. Iodine and ethane
5 Answers 1. C 2. A 3. C 4. B 5. D 6. C 7. B 8. B 9. D 10. B 11. D 12. B 13. D 14. D 15. C 16. B 17. B 18. B 19. A 20. B 21. D 22. C 23. D 24. B (ethanol is not polar enough to dissolve NaCl, but it will dissolve slightly) 25. C 26. A
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