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Chemical bonding

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The answers are at http://keyquestions.weebly.com

The answers are at http://keyquestions.weebly.com

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  • 1. Chemical Bonding<br />Notes<br />Ionic bondingCovalent bondingMetallic bondingType of substanceIonic compoundsSimple covalent compoundsGiant macromolecular compoundsMetal elementsFormation Electron exchangeElectron sharingElectron sharingBoiling, melting pointhighlowhighHighElectrical conductivityOnly when aqueous and moltenNANAIn all statesSolubleIn water, not in organic solventsIn organic solvents, not in waterNANA<br />Graphite<br />- A giant macromolecule of carbon atoms<br />- Each carbon atom only uses 3 of its 4 valence electrons for bonding<br />- The 4th electron is free to conduct electricity<br />- Strong covalent bonds IN layers<br />- High melting point, high boiling point<br />- Weak van der Waal’s forces BETWEEN layers<br />- Soft and brittle<br />Diamond<br />- Giant, tetrahedral structure of carbon atoms<br />- All 4 valence electrons in each carbon atom are used for covalent bonding<br />- No electrical conductivity<br />- High melting point, high boiling point<br />- Hard, strong<br />Workout questions<br />
    • Which of the following substances has a macromolecular structure?
    • 2. Sodium chloride
    • 3. Water
    • 4. Silicon dioxide
    • 5. Sulphur dioxide
    • 6. Which of the following substances have the best electrical conductivity?
    • 7. H2O (g)
    • 8. NaCl (s)
    • 9. NaCl (aq)
    • 10. Diamond
    • 11. Which of the following substances is likely to have the highest boiling point?
    • 12. Magnesium sulphate
    • 13. Nitrogen oxide
    • 14. Phosphorus dioxide
    • 15. Fluorine gas
    • 16. If element X forms the ionic compound XBr, how many valence electrons does X have?
    • 17. 1
    • 18. 7
    • 19. 0
    • 20. 8
    • 21. If element Y forms the covalent compound YCl, how many valence electrons does Y have?
    • 22. 1
    • 23. 7
    • 24. 9
    • 25. 8
    • 26. With which of the following will sodium form an ionic compound?
    • 27. Magnesium
    • 28. Zinc
    • 29. Iodine
    • 30. Water
    • 31. Which of the following statements are true about diamond and graphite?
    • 32. Both conduct electricity although they are covalent compounds
    • 33. They have van der Waals forces
    • 34. They are both made of carbon only
    • 35. They are both made of carbon and lead
    • 36. Draw dot and cross diagrams showing only valence electrons to represent the bonds in
    • 37. A sulphate ion
    • 38. Ammonia
    • 39. An ammonium ion
    • 40. Aluminium Chloride
    • 41. With the help of a suitable diagram, illustrate the type of bonding present in Iron and explain why it is able to conduct electricity well.
    • 42. ______________________________________________________________________________
    • 43. ______________________________________________________________________________
    • 44. ______________________________________________________________________________
    • 45. Explain the following phenomena:
    • 46. Graphite is a covalent molecule, yet it is able to conduct electricity
    • 47. ________________________________________________________________________
    • 48. ________________________________________________________________________
    • 49. Carbon dioxide is a gas and silicon dioxide is a solid at r.t.p.
    • 50. ________________________________________________________________________
    • 51. ________________________________________________________________________
    • 52. Sodium chloride can conduct electricity when aqueous and molten, but not when solid
    • 53. ________________________________________________________________________
    • 54. ________________________________________________________________________
    • 55. At room temperature and pressure, there is a solid and a gas. One of them is sulphur oxide and the other is copper oxide. Which is which? Explain.
    • 56. ______________________________________________________________________________
    • 57. ______________________________________________________________________________