C4 Chemical Calcualtiona (oh Hell No) Flashcards
Whats a mole
The mass of a substance that contains 6.02 x 10 -23 particles
Gove the value for Avogrado’s constant
6.02 x 10 ^-23
How to calculate number of moles from mass and Mr
Mass/Mr
How to calculate mass from moles and Mr
Moles x Mr
Whats a limiting reactant
The reactant that is completely used up first in a reaction
If a reactant isnt all used up it is in…
Excess
Whats the unit for concentration
Dm3
How to calculate concentration from mass and volume
Mass/volume
How to calculate volume from concentration and mass
Mass / concentration
How to convert from cm3 to dm3divide by 1000
How can concentration in mol/dm3 be calculated
Moles/volume
Whats does Mr mean
Relative masses of all the atoms in a formula
Whats the law of co servation of madd
Total mass of reactants = total mass of products
Whats the empirical ratio
A ratio that shows the simplest hole number ratio of atoms in each element within a compound
How to work out empirical ratio
Find Mass and Mr. Divided them. Find ratio. Turn it into simplest ratio. E.g. if its 0.1 and 0.2 they equal 1 and 2.
How to find how many atoms are in an element
Mass divided by molar mass x Avogrado number
How to find uncertainty
Find mean (ignore anomalies and to 2sg)
Find range
Divide range by 2.
How to calculate number of reacted moles
Mass(product) - mass (solute)
Divide by relative formula mass
E.g. 2.0 - 1.2 = 0.08. 0.08 / 2 x 16 (oxygen) = 32
0.08/32 = answer
How to calculate mass of element produced
Find moles
Using required moles times by RAM
How to find mass of element produced (with mass example. E.g. with 0.50g reacts with oxygen)
Mass (product) / mass (original)
X by mass. (E.g. 0.5g)
