Stuff Flashcards
What is relative atomic mass
Mass of one atom
We find this in the periodic table
Ar means relative atomic mass
(Biggest number)
What is relative formula mass
the mass of two or more atoms added together
To calculate this we add the Ar of each atom present
Mr means formula mass
Calculate the relative formula mass of
Ca(OH)^2
Ca = 40 O = 16 H = 1
40 + 16 + 16 + 1 + 1
=74
What is the law of conservation of mass
The total mass of the reactants is the same as the total mass of the products
What is empirical formula
The simplest whole number ratio of atoms or ions in a substance
What is molecular formula
The actual number atoms of each element in one molecule
Identity which is the molecular and which is the empirical formula
1) C^6H^14
2) C^3H^7
1) molecular
2) empirical
Calculating empirical formula (on phone)
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(Reacting masses)
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Balancing equations
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One mole of particles is 6.02 x 10^23 particles
What is this number of particles called
Avagarjdos constant
What are the three types of particles
- atoms
- ions
- molecules
What is the other calculation including ‘amount of moles’
Number of particles ——————————————————— Amount of moles X Avagarjdos constant
Mass
————————————
Amount of moles X Ar/Mr
Ar = atomic mass Mr = mass of molecule
What is the other equation including ‘amount of moles’
Mass ———————————— Amount of moles X Ar/Mr
Number of particles
——————————————————
Amount of moles X Avagarjdos constant
What is Avagarjdos constant
6.02 x 10^23 mol ^-1
