G8 Synthesis and Analysis Chemical Quantities and Yields
Gapfill exercise
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actual balanced formula reactants Scale theoretical theroetical
Chemists need to know how much of a product they will get from the
actual
balanced
formula
reactants
Scale
theoretical
theroetical
.
Start with a
actual
balanced
formula
reactants
Scale
theoretical
theroetical
symbol equation.
Work out the relative
actual
balanced
formula
reactants
Scale
theoretical
theroetical
mass of each ractant and product. For example CaCO
_{3}
- you add together the relative atomic mass of Calcium + Carbon + (Oxygenx3)
Write the relative formula mass under each part of the balanced equation.
actual
balanced
formula
reactants
Scale
theoretical
theroetical
the quantities to suit the amounts used in the experiment.
Yields
The yield of a synthesis is the quantity of product created from known amounts of starting materials.
The
actual
balanced
formula
reactants
Scale
theoretical
theroetical
yield is the mass of product after separating it from the mixture, purifying and drying it.
The
actual
balanced
formula
reactants
Scale
theoretical
theroetical
yield is the mass of product expected if the reaction goes perfectly and there are no losses while purifying, transferring the chemicals etc.
The
actual
balanced
formula
reactants
Scale
theoretical
theroetical
yield is always less than the
actual
balanced
formula
reactants
Scale
theoretical
theroetical
yield because in real life there are small losees.
Percentage Yield
This is the percentage of the
actual
balanced
formula
reactants
Scale
theoretical
theroetical
yield that is actually obtained.
Percentage yield = (actual yield x 100)/theoretical yield
Check
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