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Bonding

Bonding. Click to start. A. Ethanoic acid, CH 3 COOH. B. Dichloroethane, CH 2 Cl 2. C. Magnesium chloride, MgCl 2. Silicon tetrabromide,SiBr 4. D. Question 1. Which compound contains ionic bonds?. Wrong Answer!.

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Bonding

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  1. Bonding Click to start

  2. A Ethanoic acid, CH3COOH B Dichloroethane, CH2Cl2 C Magnesium chloride, MgCl2 Silicon tetrabromide,SiBr4 D Question 1 Which compound contains ionic bonds?

  3. Wrong Answer! Magnesium is a metal and chlorine is a non-metal. Typically, a metal and non-metal react to form an ionic compound. Try Again

  4. A CH4 , NH3 , H2O B NH3 , H2O , CH4 C NH3 , CH4 , H2O H2O , NH3 , CH4 D Question 2 When CH4 , NH3 and H2O are arranged in order of dereasing bond angle, what is the correct order?

  5. Wrong Answer! All the molecules are based upon tetrahedral arrangement of 4 regions of high electron density. However, lone pairs cause more repulsion than bonding pairs. The oxygen in H2O is surrounded by 2 lone pairs (max repulsion), the nitrogen atom in NH3 contains 1 lone pair, but the carbon in CH4 has no lone pairs ( least repulsion) Try Again

  6. A I only B III only C II and III only I , II and III D Question 3 In which of the following is there at least one double bond? • O2 • CO2 • C2F2

  7. Wrong Answer! The oxygen molecule (O=O) contains 1 double bond, the carbon dioxide (O=C=O) contains 2 double bonds and thetetrafluoroethane molecule contains 1 double bond Try Again

  8. Hydrogen bonds form between ethane molecules but not present in liquid neon. The ethane molecule is polar. A B More electrons are present in ethane than in neon. A molecule of ethane has a greater mass than a neon atom. C D Question 4 Why is the boiling point of ethane greater than that of neon?

  9. Wrong Answer! Both ethane and neon are non-polar. Hence, the predominant intermolecular and inter-atomic forces are van der Waals’ forces whose size depends on the number of electrons present in the atoms or molecules. A greater number of electrons in the ethane molecule results in a stronger temporary dipole which makes neighbouring molecules or atoms attract each other more strongly. This means more heat is reqiured to overcome the intermolecular or inter-atomic forces in ethane molecules, resulting higher boiling point. Try Again

  10. A Sr3N2 B Sr2N3 C Sr2N SrN D Question 5 What is the formula for the compound formed by strontium and nitrogen?

  11. Wrong Answer! Strontium form Sr2+ and nitrogen forms N3- .Hence, the formula of strontium nitride is Sr3N2 Try Again

  12. A covalent B ionic C dipole-dipole metallic D Question 6 A solid has a melting point 14400C. It conducts heat and electricity. It does not dissolve in water or in organic solvents. The bond between the particle is most likely to be

  13. Wrong Answer! Generally, metals have high melting points, contain delocalized electrons, insoluble in water and excellent conductors. Try Again

  14. The attraction between the nuclei of positive ionsand delocalized valene electrons. A The attraction between positve and negative ions. B C The attraction between protons and electrons . The attraction between nuclei and shared electron pairs. D Question 7 Which is the best description of metallic bonding?

  15. Wrong Answer! D is a description of covalent bonding. A is a description of ionic bonding. Try Again

  16. A ethane B propane C propan-1-ol hexan-1-ol D Question 8 Which compound is the most soluble in water?

  17. Wrong Answer! Ethane and propane are hydrocarbons and hence unable to form hydrogen bonds with water. Propan-1-ol and hexan-1-ol are both alcohols and contan hydroxyl group –OH, capable of forming hydrogen bonds with water molecules. However, propan-1-ol is more soluble since its hydrocarbon chain is smaller, 3 C atoms compared to 6 in hexan-1-ol . Try Again

  18. A covalent bonding B van der Waals’ force C dipole-dipole attractions hydrogen bonding D Question 9 Which is not present in C2H5OC2H5 in the liquid state?

  19. Wrong Answer! All of the hydrogen atoms are attached to C atoms and hence are unable to engage in hydrogen bonding. Try Again

  20. A 1800 B 1200 C 1090 900 D Question 10 The angle between the two carbon-carbon bonds in CH3CHCF2 is closest to

  21. Wrong Answer! The molecule has a C=C bond. There are 3 regions of high electron density around the 2 carbon atoms. Hence, the molecule is trigonal planar and has bond angles of 1200. Try Again

  22. A B CH3F<CH3OH<C2H6 C CH3OH<CH3F<C2H6 C2H6<CH3F<CH3OH D Question 11 The molar masses of C2H6, CH3OH and CH3F are similar. How do their boiling points compare? C2H6<CH3OH<CH3F

  23. Wrong Answer! Ethane, C2H6 has a lower boiling point due to the presence of van der Waals forces of attraction – weakest of the 3 intermolecular forces. Fluoromethane, CH3F has an intermediate boiling point owing to the presence of dipole-dipole forces. Methanol, CH3OH has the highest boiling point owing to the presence of hydrogen bonding. Try Again

  24. A NCl3 B C2H4 C C3H6 SF6 D Question 12 Which of the following molecules is a triangular planar?

  25. Wrong Answer! C2H4 has a trigonal planar arrangement around the 2 carbon atoms. Try Again

  26. A dipole-dipole interactions B covalent bonds C hydrogen bonds D Question 13 Which intermolecular forces exist in dry ice, CO2(s)? van der Waals’ forces

  27. Wrong Answer! CO2 is a non-polar molecule due to its linear shape. The 2 dipoles cancel each other out. Hence, the forces operating in the soild are van der Waals’ forces. Try Again

  28. covalent bonds, hydrogen bonds, van der Waals forces covalent bonds, van der Waals forces, hydrogen bonds A B hydrogen bonds, covalent bonds, van der Waals forces van der Waals forces hydrogen bonds, covalent bonds C D Question 14 In general, the strengths of the following intermolecular forces and bonds increase in the order

  29. Wrong Answer! The relative order of strength is van der Waals’ forces, hydrogen bonds, covalent bonds Try Again

  30. A O-H in H2O B N-O in NO2 C N-F in NF3 N-H in NH3 D Question 15 Given the following electronegativity values: H: 2.1 N: 3.0 O: 3.5 F:4.0 which bond has the greatest polarity?

  31. Wrong Answer! The largest difference in electronegativity value is from O and H atoms. Try Again

  32. A BCl3 B NCl3 C H2Se C2H3 D Question 16 Which one of the species has a triangular pyramidal geometry?

  33. Wrong Answer! The nitrogen atom in NCl3 is surrounded by 3 bonding pairs and 1 lone pair. Try Again

  34. A II only B I and III only C II and III only I, II and III D Question 17 In which of the following substances would hydrogen bonding be expected to occur? • C2H6 • CH3CH2COOH • CH3COCH3

  35. Wrong Answer! A hydrogen bond would expect to occur in CH3CH2COOH since it contains hydrogen bonded directly to oxygen. The OH group is able to engage in hydrogen bonding. In the other 2 compounds, the hydrogen is bonded to C. Try Again

  36. A 5 and 5 B 7 and 4 C 8 and 4 7 and 5 D Question 18 When the Lewis structure for HCOOCH3 is drawn, how many bonds and how many lone pairs of electrons are present?

  37. Wrong Answer! Each oxygen atom has 2 lone pairs, so there are 8 bonds. 4 x C-H, 2 C-O, 1 X C=O Try Again

  38. Congratulations!

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