Form 4 chapter 2

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This document discusses the basics of matter including atoms, molecules, ions, elements, and compounds. It defines these terms and explains how atomic force microscopy and surface electron tunneling microscopy can be used to observe atoms and determine if something is an element or compound. It also covers the three main states of matter - solid, liquid, and gas - and how their arrangement and movement differs. Additionally, it discusses kinetic molecular theory and how energy is required to change a substance's state through processes like melting and boiling that involve breaking and forming bonds between atoms.

Technologie Business

Molecules
• Two or more atoms bonded together
COVALENTLY

Ion
• Positively charged or negatively charged

• Consists of ALL the same ATOMS
• All S atoms

How do we know ?
• Atomic Force Microscopy (AFM)

Diamond
• Consists of ALL the same ATOMS
• All C atoms

Compounds
• Consists of only two or more different atoms
BONDED CHEMICALLY TOGETHER

How do we know ?
• Surface Electron Tunneling Microscope

State Solid Liquid Gas

Arrangement

Movement Vibrate and Rotate Packed closely but no Very far from one
and FIXED position in order another in random
arrangement

Forces of Attraction Strong Medium Weak

Energy Content Low Medium High

Napthalene
• Has Van Der Waals attraction

B to C
• Energy absorbed used to break bonds
• Breaking bonds needs ENERGY !

Bond formation
• Bond formation needs energy !

Bond breaking: Absorb Energy
Bond formation: Release Energy

BUT….
Water
Releases
Heat into surroundings

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Form 4 chapter 2

1. Chapter 2 Matter

2. Atoms • Smallest particle of an element

3. Molecules • Two or more atoms bonded together COVALENTLY

6. Ion • Positively charged or negatively charged

7. Elements • Consists of only one atoms

8. Sulphur is an element !

9. • Consists of ALL the same ATOMS • All S atoms

10. How do we know ? • Atomic Force Microscopy (AFM)

11.

12.

13. Diamond • Consists of ALL the same ATOMS • All C atoms

14.

15.

16. Compounds • Consists of only two or more different atoms BONDED CHEMICALLY TOGETHER

17. Sodium Chloride (NaCl)

18.

19. How do we know ? • Surface Electron Tunneling Microscope

20. • NaCl a compound !

21. Sulphur hexafluoride • Contains S and F

22. NanoKids

23.

24. Kinetic Theory of Matter FAME !!

25. State Solid Liquid Gas Arrangement Movement Vibrate and Rotate Packed closely but no Very far from one and FIXED position in order another in random arrangement Forces of Attraction Strong Medium Weak Energy Content Low Medium High

26. Rates of Diffusion

27.

28. Napthalene • Has Van Der Waals attraction

29.

30. A to B • Solid temperature increase

31. B to C • Energy absorbed used to break bonds • Breaking bonds needs ENERGY !

32. C to D • Liquid temperature increase

33. D to E • Boiling !!!

34. E to F • Gas temperature increase

35.

36. Bond formation • Bond formation needs energy ! Bond breaking: Absorb Energy Bond formation: Release Energy

37. Bond formation Releases Heat into water

38. BUT…. Water Releases Heat into surroundings

Form 4 chapter 2

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