AQA Chemistry 2

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Author:
HLHSscience
ID:
219568
Filename:
AQA Chemistry 2
Updated:
2014-03-23 06:09:48
Tags:
AQA Triple Unit Bonding
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Description:
Bonding
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  1. Which type of bonding is present in water?
    covalent
  2. Which type of bonding is present in calcium carbonate?
    ionic
  3. Why are ionic sunstances high melting point solids?
    there are strong forces of attraction between the oppositely charged ions
  4. Why do covalent substances have low melting and boiling points?
    There are weak forces of attraction between molecules
  5. Why can graphite conduct electricity?
    There are delocalised electrons
  6. Why is diamond hard?
    There are strong covalent bonds between the atoms
  7. Why are metals malleable?
    The layers of metal ions can slide over each other
  8. Why is an alloy?
    a mixture of metals
  9. Why are alloys harder than pure metals?
    the layers of metal ions are distorted and cannot easily slide over each other
  10. What is unusual about nano particles?
    they are VERY tiny
  11. Why can an ionic sunstance conduct electricity when molten or in solution?
    the ions are free to move
  12. Which class of polymer cannot melt once formed?
    thermosetting
  13. Sodium has an atomic number of 11 and a mass number of 23.
    How many protons, neutrons and electrons are in each sodium atom?
    • 11 protons
    • 11 electrons
    • 12 neutrons
  14. How are the electrons arranged in a chlorine atom (17 electrons)?
    2.8.7
  15. Why do atoms form chemical bonds?
    To get a full outer shell of electrons
  16. What is a smart memory alloy?
    An alloy that returns to its original shape after being deformed
  17. Magnesium has 12 electrons.

    What will be the formula of a magnesium ion?
    Mg2+
  18. Oxygen has 8 electrons.

    What is the formula of an oxide ion?
    O2-
  19. What is the formula of calcium chloride?

    ( Ions present are Ca2+  and Cl- )
    CaCl2
  20. What is the formula of calcium hydroxide?

    ( ions present are Ca2+  and OH- )
    Ca(OH)2

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