Honors Chemistry Unit 5 – Chemical
Stoichiometry
Consider:
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What is a limiting reagent?
Why are stoichiometric calculations important?
Can my group achieve a percent yield of 100% after multiple reactions?
Learning Targets: Students will:
 Solve basic stoichiometry problems
following a stepwise procedure.
 Solve limiting reagent stoichiometry
problems by following stepwise
procedures.
 Determine percent yield from
stoichiometric calculations.
 Carry out a sequence of reactions in
the lab, starting with pure copper,
transforming it to a variety of copper
compounds and recovering pure
copper in the final reaction.
LAB # 6 – CHEMICAL REACTIONS OF
COPPER AND PERCENT YIELD.
THIS LAB YOU WILL:
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Start with a precise amount of pure
copper.
Transform the copper into copper (II)
nitrate.
Transform the copper (II) nitrate into
copper (II) oxide.
Transform the copper (II) oxide into
copper (II) sulfate.
Use a single replacement reaction to
recover pure copper from the copper (II)
sulfate.
Achieve a percent yield of close to 100%.
Identify reasons why your percent yield
may not have been 100% and propose
solutions for all problems identified.
KEY VOCABULARY:
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Limiting reagent (reactant)
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Predicted Yield
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Actual Yield
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Percent Yield
STOICHIOMETRY STEPS:
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Balanced equation
Circle what you know and what you
are trying to find in equation
Four step factor label (two factor
labels for limiting reagent problems)
KEY ACTIVITIES
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Complete basic stoichiometric calculations
on worksheets and on a Unit Test.
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Apply superior lab skills and procedures to
achieve a percent yield of nearly 100%
when starting with pure copper,
transforming it into a variety of copper
compounds and finally recovering pure
copper.