AS chemistry

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Author:
Anonymous
ID:
243109
Filename:
AS chemistry
Updated:
2013-10-27 05:44:43
Tags:
amount substance
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revision
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  1. relative atomic mass
    • average mass of one atom of an element 
    • -----------------------------------------------
    • 1/12th mass of one atom of 12C
  2. Mr
    relative formula mas

    • average mass of an entity 
    • -------------------------------
    • 1/12th mass of one atom of 12C 

    relative molecular mass 

    • average mass of a molecule 
    • --------------------------------
    • 1/12th mass of one atom of 12C
  3. how many hydrogen atoms weigh the same as
    16 atoms of oxygen
    16 x 16 = 256
  4. find the name of the element that weighs the same as 3 atoms of beryllium
    aluminium
  5. we use relative formula mass rather than relative atomic mass for ionic compounds because
    ionic compounds don't exist as molecules
  6. acid + base --->
    salt + water
  7. an acid is a substance that has
    a pH less than 7
  8. a base is a substance that has a pH

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