Stoichiometry
Stoichiometry is the practice of predicting the amount of product or reactant in a chemical equation based on a known amount of one of the other products or reactants. The ability to do these calculations is the culmination of all of the basic skills learned throughout the first semester.
Pre-Stoichiometry Review Packet
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Purpose: This is a worksheet reviewing some of the important concepts needed from previous chapters to be successful with stoichiometry. Each section has a sample problem followed by a series of practice questions. Included is ionic nomenclature, covalent nomenclature, acid nomenclature, reaction types, and molar conversions.
Essential Concepts: Ionic nomenclature, covalent nomenclature, acid nomenclature, synthesis, decomposition, single-replacement, double-displacement, combustion, molar conversions.
Stoichiometry - Moles to Moles
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Purpose: This is the first of four stoichiometry worksheets. In this worksheet, students will start learning the concepts of stoichiometry by performing simple mole-to-mole conversions. They will be given the moles of a product or reactant, then use molar (coefficient) ratios to convert.
Essential Concepts: Stoichiometry, moles, molar ratios.
Stoichiometry: Moles to Grams
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Purpose: This is the second of four stoichiometry worksheets. In this worksheet, students will have the added step of converting grams of a reactant or product to moles before performing the stoichiometric conversions.
Essential concepts: Stoichiometry, moles, molar ratios, mole conversions, molar mass.
Stoichiometry Grams to Grams
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Purpose: This is the third of four stoichiometry worksheets. In this worksheet, students will add another step to their stoichoimetry -- they will have to convert from grams to moles of a reactant or product, from moles to moles of another substance in the equation, then back to grams.
Essential Concepts: Moles, molar conversions, conversion factor, formula mass, molar mass.
Mixed Stoichiometry Problems
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Purpose: This is the last of the series of four stoichiometry worksheets. This one mixes several different types of problems -- moles to moles, moles to grams, grams to grams, and even some conversions with particles and volume.
Essential Concepts: Moles, molar conversions, conversion factor, formula mass, molar mass, Avagadro's number, molar volume..
Percent Yield
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Purpose: By using stoichoimetry, we can predict the amount of product that will form in a chemical reaction, based on the amount of each reactant that we are starting with. This predicted amount of product based on stoichiometry is called theoretical yield. When the experiment is conducted, the actual yield is the measured amount of product you physically have at the end. In this worksheet, students calculate how much of the expected product was actually made by a reaction. This is percent yield.
Essential concepts: Actual yield, percent yield, theoretical yield.
Limiting Reagents
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Purpose: In all of the stoichiometry problems so far, students have been given a volume, mass, or amount of one specific substance and asked to solve based on that. This worksheet gives them two measurements. They must determine which of the two is the limiting reagent -- the one that will be used up first in the reaction and will thus determine the amount of product made.
Essential Concepts: Stoichiometry, limiting reagents.
Mythbusters - Antacid Jail Break Worksheet
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Purpose: This episode of Mythbusters tests the idea that a prisoner could hoard enough antacid tablets over years of incarceration to create an acid/base reaction that would release enough carbon dioxide to rupture the cell and allow escape.
Essential Concepts: Stoichiometry, limiting reagents, acids, bases.
Mythbusters - The Bourne Magazine
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Purpose: This episode of Mythbusters tests a scene from the Bourne Identity where Jason Bourne turns on the gas main in his apartment and places a magazine in a toaster, creating a delayed explosion. This episode specifically talks about the stoichiometry of combustion reactions, and the necessity of having the right mix of oxygen and fuel.
Essential Concepts: Stoichiometry, combustion.
