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19 Cards in this Set
- Front
- Back
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eqaution for mass |
moles x Mr |
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equation for ideal gas |
PV = nRT
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what are the units for this equationPV = nRT |
Unit of Pressure (P):Pa
Unit of Volume (V): m3 Unit of Temp (T): K n= moles R = 8.31 |
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what is the equation for concentration |
moles/volumes |
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what are the units for moles= concentration x volumes |
Unit of concentration: mol dm-3
Unit of Volume: dm3 |
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EXAMPLE |
cm3= dm3 ÷ 1000
cm3 = m3 ÷ 1000 000 dm3 = m3 ÷ 1000 |
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how to convert oC to K |
+273 |
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what is the defintion of the mole |
amount of substance in grams that has the same number of particles as there are atoms in 12 grams of carbon 12 |
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equation for number of particles |
amount of substance (in mol) X Avogadro's constant
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what is Avogadro's constant |
There are 6.02 x 1023 atoms in 12 grams of carbon-12
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what is the empirical formula |
An empirical formula is the simplest ratio of atoms of each element in the compound.
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what is the molecular formula |
A molecular formula is the actual number of atoms of each element in the compound.
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method for empirical formula |
1. divide each mass by atomic mass of element 2.for each of the answers from step 1 divide by the smallest of these numbers sometimes the numbers calculated in step 2 will need to multiplied to give whloe numbers |
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how to calculate % yield |
actual yield /theoretical yield x100
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how to calculate % atom economy |
Mass of useful products /Mass of all reactants x100
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what are the potential errors using gas syringe |
syringe sticks some gases are soluble in water sp true amount of gas is not measured gas escapes before bung is inserted |
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describe how to decrease apparatus errors |
using apparatus with greater resolution increase the size of measuremnt made |
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how to reduce errors in titration |
use pipettes or burrettes increase volume and concentration of substance in conical flask decrease concentration of substace in burette |
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reduce errors in measuring mass |
weighing sample before and after addition and then calculate difference will ensure a more accurate measurement of mass added |
