CH2

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Author:
Anonymous
ID:
303580
Filename:
CH2
Updated:
2015-06-02 15:53:09
Tags:
CH2
Folders:
CH2
Description:
Final exam
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  1. Why metallic bond strength decreases down the group?
    • Atomic radius increase --> delocalised electrons futher away from the nuclear charge --> attraction decreases 
    • Charge density decreases --> weaker metallic bond 
    • Greater shielding effect
  2. Colour of Cl2, Br2, Isolution?
    • Cl: pale green
    • Br: orange- brown
    • I: brown
  3. Example of smart materials?
    • Shape memory alloys 
    • photochromic & thermochromic materials 
    • self-healing materials
  4. Smart materials?
    Materials that can reversibly change in properties when conditions change
  5. Crystal co-ordination numbers?
    The number of anions around each cation in an ionic lattice and vice versa
  6. Hydrogen bonding?
    • A relatively strong intermolecular bond
    • A hydrogen atom joined to a very electronegative element in a molecule 
    • Bonding to the another electronegative element in another molecule
  7. Electronegativity?
    The ability of an atom in a covalent bond to attract the electron pair
  8. Ionic bond?
    Formed by the attractions between positive ions and negative ions
  9. Co-ordinate bond?
    A covalent bond where both electrons come from one of the atoms
  10. Definition of covalent bond?
    • A pair of electrons of opposite spin shared between two atoms
    • Each atom gives one electron to the bonding pair of electron

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