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
Preview of Chemistry AQA AS Unit 1 Calculations

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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 of an element
1/12th mass of C-12 atom
RELATIVE MOLECULAR MASS Mr:
The relative molecular mass, Mr, of a molecule is the mass of that molecule compared to
1/12th the relative atomic mass of a C-12 atom.
The Mr of a substance (g) contains one mole of entities.
Average mass of one molecule
1/12th of an atom of C-12
RELATIVE FORMULA MASS Mr:
Ionic compounds (because they don't exist as molecules so cannot be said to have a Mr)
AVOGRADO CONSTANT:
The number of atoms in 12g of C-12
THE MOLE:
The amount of substance that contains 6.022 X 1023
The Ar of any element (g) contains one mole of atoms.
No. of moles= Mass (g) ÷ Ar

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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.
It is the basic method of finding the empirical formula of new compounds.
It is burning the compound in excess O to measure the amount of HO, CO and other oxides.…read more

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YIELD:
No. of moles of product
Theoretical max no.…read more

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