Form 4 chapter 2
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Transcript

  • 1. Chapter 2 Matter
  • 2. Atoms• Smallest particle of an element
  • 3. Molecules• Two or more atoms bonded together COVALENTLY
  • 4. Ion• Positively charged or negatively charged
  • 5. Elements• Consists of only one atoms
  • 6. Sulphur is an element !
  • 7. • Consists of ALL the same ATOMS• All S atoms
  • 8. How do we know ?• Atomic Force Microscopy (AFM)
  • 9. Diamond• Consists of ALL the same ATOMS• All C atoms
  • 10. Compounds• Consists of only two or more different atoms BONDED CHEMICALLY TOGETHER
  • 11. Sodium Chloride (NaCl)
  • 12. How do we know ?• Surface Electron Tunneling Microscope
  • 13. • NaCl a compound !
  • 14. Sulphur hexafluoride• Contains S and F
  • 15. NanoKids
  • 16. Kinetic Theory of Matter FAME !!
  • 17. State Solid Liquid GasArrangementMovement Vibrate and Rotate Packed closely but no Very far from one and FIXED position in order another in random arrangementForces of Attraction Strong Medium WeakEnergy Content Low Medium High
  • 18. Rates of Diffusion
  • 19. Napthalene• Has Van Der Waals attraction
  • 20. A to B• Solid temperature increase
  • 21. B to C• Energy absorbed used to break bonds• Breaking bonds needs ENERGY !
  • 22. C to D• Liquid temperature increase
  • 23. D to E• Boiling !!!
  • 24. E to F• Gas temperature increase
  • 25. Bond formation• Bond formation needs energy !Bond breaking: Absorb EnergyBond formation: Release Energy
  • 26. Bond formation ReleasesHeat into water
  • 27. BUT…. Water ReleasesHeat into surroundings