Chemistry AQA AS Unit 1 Calculations

Made these notes for my year 12 summer exam to revise and read over. There are spelling mistakes in most of my files but due to the busy exam schedule I had no time to correct them (sorry).

Most files have more information than what is needed but I feel it helps you feel more confident walking into the exam if you have a greater knowledge background and may help when having to apply knowledge to questions. Good luck :)

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  • Created by: Chelcie
  • Created on: 02-09-13 13:07

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Chemistry Unit 1 Calculations
CALCULATIONS
RELATIVE ATOMIC MASS Ar:
The weighted average mass of an atom/element, taking into account it's naturally occurring
isotopes, relative to 1/12th the relative atomic mass of the carbon-12 atom.
The Ar of any element (g) contains one mole of atoms.

Average mass of one atom…

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Concentration (dm-3) = No. of moles ÷ Volume (dm3)




EMPIRICAL FORMULA:
The simplest ration of atoms of each element present in a compound.

Mass
Ar
N
Ratio




MOLECULAR FORMULA:
The actual number of atoms of each element in a molecule.


COMBUSTION ANALYSIS:
Organic compounds are based on carbon and hydrogen.…

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% YIELD:
No. of moles of product
Theoretical max no. of moles of product

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