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Stoichiometry The Stoichiometry group contains three groups: Exploding Soap Bubbles: Hydrogen + Oxygen; Acid-Base Titrations and Animation; and Redox Titration and Animation.
Stoichiometry
Gas Stoichiometry Gas is generated from one mole of liquid of solid and the volume is measured using a gas collection system.
Stoichiometry : CalcPercentYield (8 Variations)
When copper is heated in air, copper(II) oxide is formed. In a given experiment, 1.50 g copper was heated to yield 1.76 g copper(II) oxide. What is the percent yield?
Stoichiometry : LimitingReagent (8 Variations) The synthesis of urea by Frederich W??hler in 1825 began the decline of the idea that "organic" chemicals could only be made by living organisms as part of their biological processes.
AgOCN(aq) + NH4Cl(aq)AgCl(s) + NH2CONH2(aq)
If you perform this reaction and collect the following table of data, in which trial(s) is AgOCN clearly the limiting reactant?
Trial
AgOCN used
NH4Cl
AgCl produced
1
20.4 mL
5.3 mL
2.4 g
2
20.3 mL
10.4 mL
4.3 g
3
20.6 mL
15.4 mL
6.2 g
4
20.5 mL
20.6 mL
8.2 g
5
20.4 mL
25.2 mL
10.2 g
6
20.3 mL
30.4 mL
10.3 g
The mL of AgOCN and NH4Cl are the initial amounts used, the mass of AgCl is how much was recovered from the reaction. (Hint: You do not need to do any calculations to answer this question.)
A Dramatic Classroom Demonstration of Limiting Reagent Using the Vinegar and Sodium Hydrogen Carbonate ReactionRomklao Artdej and Tienthong Thongpanchang This demonstration, appropriate for high school chemistry level and recommended for a large classroom presentation, is designed to illustrate the concept of limiting reagent via a series of experiments in which increasing amounts of sodium bicarbonate are added to a fixed amount of vinegar is fixed until the volume of carbon dioxide generated remains constant. Artdej, Romklao; Thongpanchang, Tienthong. J. Chem. Educ.2008, 85, 1382.
Acids / Bases |
Food Science |
Gases |
Stoichiometry
Thermochemical Analysis of Neutralization Reactions: An Introductory Discovery ExperimentKenneth V. Mills and Louise W. Guilmette Describes a guided-inquiry laboratory pedagogy in which students discover chemical concepts in the lab and the instructor uses their pooled data to guide the lecture portion of the course. This method is illustrated by an experiment that reinforces students' understanding of stoichiometry and allows them to discover neutralization reactions and thermochemistry. Mills, Kenneth V.; Guilmette, Louise W. J. Chem. Educ.2007, 84, 326.
Acids / Bases |
Stoichiometry |
Calorimetry / Thermochemistry |
Acids / Bases
Mole City: A Stoichiometric AnalogyAddison Ault Offers an analogy to illustrate one of chemistry's most fundamental concepts and skills. Ault, Addison. J. Chem. Educ.2006, 83, 1587.
AgCl(s) + NH2CONH2(aq) 
