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Using the idea of a dozen to get the concept of mole and avogadro number across
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Eggs, Mass and MolesEggs, Mass and MolesRAY 2010RAY 2010
Weighing eggsWeighing eggs
eggs sold in dozenseggs sold in dozens
Weighing eggsWeighing eggs
eggs sold in dozenseggs sold in dozens a dozen is 12a dozen is 12
Weighing eggsWeighing eggs
eggs sold in dozenseggs sold in dozens a dozen is 12a dozen is 12 imagine you have lots imagine you have lots
of eggsof eggs
Weighing eggsWeighing eggs
eggs sold in dozenseggs sold in dozens a dozen is 12a dozen is 12 imagine you have lots imagine you have lots
of eggsof eggs you want to know how you want to know how
many dozen you havemany dozen you have
Weighing eggsWeighing eggs
eggs sold in dozenseggs sold in dozens a dozen is 12a dozen is 12 imagine you have lots imagine you have lots
of eggsof eggs you want to know how you want to know how
many dozen you havemany dozen you have if you know how much if you know how much
1 dozen weighs and 1 dozen weighs and how much the total how much the total weighs…weighs…
Weighing eggsWeighing eggs
eggs sold in dozenseggs sold in dozens a dozen is 12a dozen is 12 imagine you have lots imagine you have lots
of eggsof eggs you want to know how you want to know how
many dozen you havemany dozen you have if you know how much if you know how much
1 dozen weighs and 1 dozen weighs and how much the total how much the total weighs…weighs…
Number = mass of sample of dozen mass of one dozen
Weighing eggsWeighing eggs
eggs sold in dozenseggs sold in dozens a dozen is 12a dozen is 12 imagine you have lots imagine you have lots
of eggsof eggs you want to know how you want to know how
many dozen you havemany dozen you have if you know how much if you know how much
1 dozen weighs and 1 dozen weighs and how much the total how much the total weighs…weighs…
Number = mass of sample of dozen mass of one dozen
number of
dozen
mass of 1 dozen
mass of sample
different types of eggs weigh different types of eggs weigh different amounts. eg:different amounts. eg:
1 dozen chicken eggs weigh 700g1 dozen chicken eggs weigh 700g 1 dozen duck eggs weigh 900g1 dozen duck eggs weigh 900g 1 dozen quail eggs weigh 250g1 dozen quail eggs weigh 250g 1 dozen ostrich eggs weigh 5000g1 dozen ostrich eggs weigh 5000g
Weighing atomsWeighing atoms
chemists weigh chemists weigh atomsatoms
Weighing atomsWeighing atoms
chemists weigh chemists weigh atomsatoms
the chemists the chemists ‘dozen’ is much ‘dozen’ is much biggerbigger
Weighing atomsWeighing atoms
chemists weigh chemists weigh atomsatoms
the chemists the chemists ‘dozen’ is much ‘dozen’ is much biggerbigger
it’s called a moleit’s called a mole
Weighing atomsWeighing atoms
chemists weigh chemists weigh atomsatoms
the chemists the chemists ‘dozen’ is much ‘dozen’ is much biggerbigger
it’s called a moleit’s called a mole we count atoms as we count atoms as
numbers of molesnumbers of moles
Weighing atomsWeighing atoms
chemists weigh chemists weigh atomsatoms
the chemists the chemists ‘dozen’ is much ‘dozen’ is much biggerbigger
it’s called a moleit’s called a mole we count atoms as we count atoms as
numbers of moles numbers of moles atoms are very tinyatoms are very tiny
Weighing atomsWeighing atoms
chemists weigh chemists weigh atomsatoms
the chemists ‘dozen’ the chemists ‘dozen’ is much biggeris much bigger
it’s called a moleit’s called a mole we count atoms as we count atoms as
numbers of molesnumbers of moles atoms are very tinyatoms are very tiny one mole is 6x10one mole is 6x102323
instead of 12 (dozen)instead of 12 (dozen)
6x1023
number of
dozen
mass of 1 dozen
mass of sample
eggs
number of
dozen
mass of 1 dozen
mass of sample
number of
moles
mass of 1 mole
mass of sample
eggs atoms
number of
dozen
mass of 1 dozen
mass of sample
number of
moles
mass of 1 mole
mass of sample
unit is dozen (12)unit is dozen (12)
eggs atoms
number of
dozen
mass of 1 dozen
mass of sample
number of
moles
mass of 1 mole
mass of sample
unit is dozen (12)unit is dozen (12) unit is mole (6 x unit is mole (6 x 10102323))
eggs atoms
number of
dozen
mass of 1 dozen
mass of sample
number of
moles
mass of 1 mole
mass of sample
unit is dozen (12)unit is dozen (12) weigh the sampleweigh the sample
unit is mole (6 x unit is mole (6 x 10102323))
eggs atoms
number of
dozen
mass of 1 dozen
mass of sample
number of
moles
mass of 1 mole
mass of sample
unit is dozen (12)unit is dozen (12) weigh the sampleweigh the sample
unit is mole (6 x unit is mole (6 x 10102323))
weigh the sampleweigh the sample
eggs atoms
number of
dozen
mass of 1 dozen
mass of sample
number of
moles
mass of 1 mole
mass of sample
unit is dozen (12)unit is dozen (12) weigh the sampleweigh the sample divide by the mass divide by the mass
of 1 dozenof 1 dozen
unit is mole (6 x unit is mole (6 x 10102323))
weigh the sampleweigh the sample
eggs atoms
number of
dozen
mass of 1 dozen
mass of sample
number of
moles
mass of 1 mole
mass of sample
unit is dozen (12)unit is dozen (12) weigh the sampleweigh the sample divide by the mass divide by the mass
of 1 dozenof 1 dozen
unit is mole (6 x unit is mole (6 x 10102323))
weigh the sampleweigh the sample divide by the mass divide by the mass
of 1 moleof 1 mole
eggs atoms
Where do we find the mass of 1 Where do we find the mass of 1 mole?mole?
Where do we find the mass of 1 Where do we find the mass of 1 mole?mole?
Where do we find the mass of 1 Where do we find the mass of 1 mole?mole?
C12
6
Where do we find the mass of 1 Where do we find the mass of 1 mole?mole?
C12
6
Where do we find the mass of 1 Where do we find the mass of 1 mole?mole?
C12
6
the relative atomic mass is themass of one mole in grams
Where do we find the mass of 1 Where do we find the mass of 1 mole?mole?
C12
6
the relative atomic mass is themass of one mole in grams
1 mole of carbon atoms weighs 12g
number of
moles
mass of 1 mole
mass of sample
