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17 Cards in this Set
- Front
- Back
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Relative atomic mass defenition |
Relative atomic mass = average mass of an atom x12 / the mass of one atom of carbon-12 |
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Relative molecular mass equation |
Relative molecular mass = average mass of an entity x12 / the mass of 1 atom of carbon-12 |
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Number of particles using the avogadros constant |
Nr of particles = number of moles x avogadros constant Avogadros constant = 6.02x10^23 |
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Detention of a mole |
The amount of substance that contains as many particles as exactly 12.00g of carbon-12 |
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The mole equation |
Nr of moles = mass (g) / relative atomic/molecular mass N=m/mr |
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Concentration equation |
Number of moles= (vol x conc) /1000 Volume = (Nr of moles x1000) / concentration You only need to divide/multiply if volume is given in cm^3 instead of dm^3 |
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Ideal gas equation |
pV=nRT p= pressure, in Pa V= volume, in m^3 n= number of moles R= gas constant, 8.31 JK^-1mol^-3 T= temperature, in K (℃+273) |
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Empiricle formula defenition |
Empiricles formula gives the simplest ratio of number of atoms of each element present in the molecule |
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Empiricle formula |
Element Element Amount/ Amount/ Ar Ar Divide by smallest * if you get 2.5 double everything * if you get 1.3 triple everything |
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Molecular formula definition |
Molecular formula gives the actual number of atoms of each element present in a molecule |
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Molecular formula |
Empiricle formula x 'a number' = molecular formula |
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Ionic equation rules |
Only split ionic substances in solution into their ions Anything on both sides cancels out |
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% atom economy equation |
(Mass of desired product / total mass of reactants ) x 100 = % atom economy |
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% yield calculation steps |
1.balance equation 2.calc Mr/Ar of what you're interested in 3. Calc moles for the one you know 2 things about 4. Ratio 5. Rearrange |
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% yield calculation equation |
(actual yield / theoretical yield ) x100 =% yield |
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Rule of balancing equations |
You can change H2O into 2H2O but not into H4O because that's not water anymore Basically you can't double a single atom in a molecule, you can only double the whole molecule |
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State what is ment by the term one mole of molecules |
An amount of substance containing the same number of atoms as a carbon-12 atom |
