Resource Topic: Stoichiometry

  • The Mole, Molarity, and Density

      Autograded Virtual Labs

    • Creating a Stock Solution

      Autograded Virtual Lab

      In this activity, students use the virtual lab to create dilute solutions from a concentrated stock solution of acids or bases. They must first calculate the correct volumes of concentrated acid solution and water…

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    • Metals Density Problem

      Autograded Virtual Lab

      In this activity, students use the virtual lab to identify 3 unknown metals by measuring their density and comparing their measurements to the densities of known metals. In this randomized version, each student…

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      • Scenario-Based Activities

    • Mixed Reception

      Scenario-Based Activity

      An in-class activity in which students use molar mass calculations, the scientific method and basic knowledge of chemical reactions to solve a murder mystery. The activity begins with a 5 minute introductory video,…

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    • Powderade: Using Sports Drinks to Explore Concentration and Dilution

      Scenario-Based Activity

      In this interactive activity, students first use color to determine which drinks are the most concentrated. Next students use the Virtual Lab to create solutions whose concentration matches that of two characters…

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    • The Factory: Using a City Water System to Explore Dilution

      Scenario-Based Activity

      In this interactive activity, students must determine whether the factories in a fictional town are adhering to the guidelines the city has established for their emissions. The challenge is that, for some factories,…

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    • Gravimetric analysis and a closer look at drinking water

      Scenario-Based Activity

      In this interactive activity, students first learn how gravimetric analysis can be used to determine the concentration of various species in water, through a combination of particulate-level representations and…

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      • Simulations

    • Periodic Table

      Simulation

      This simulation provides an interactive periodic table that also includes illustration of electron configurations in periodic trends. The schematic diagram to the right of the table plots the electron configurations…

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      • Tutorials

    • The Mole

      Tutorial

      This tutorial introduces the concept of the mole and how it is used in chemistry to connect macroscopic and molecular level scales. Practice is provided on the applied definition of the mole.

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    • Significant Figures

      Tutorial

      This tutorial provides a brief review of the guides for determining how many significant figures to include when reporting your answer in a chemistry calculation. Guided practice in performing significant figures…

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    • Dimensional Analysis/Stoichiometric Conversions

      Tutorial

      This tutorial provides a brief overview of dimensional analysis, including conversion between the amount of a substance expressed in "number of molecules" and the amount of a substance expressed in "moles of molecules".

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    • Calculating Molecular Weight

      Tutorial

      This tutorial provides instruction and practice on how to calculate the molecular weight of a substance from the atomic weights given on the periodic table.

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    • Using Molecular Weight

      Tutorial

      This tutorial explains use the molecular weight to convert between the macroscopic scale (grams of a substance) and the microscopic scale (number of molecules of that substance). Guided practice performing molecular…

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    • Composition Stoichiometry

      Tutorial

      This tutorial provides instruction and practice converting between moles of a molecule and the moles of atoms that the molecule is composed of.

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    • Solution Stoichiometry (Molarity)

      Tutorial

      This tutorial provides a quantitative overview of substances in solution and practice quantifying the amount of a substance in a solution. Guided practice in solution concentration calculations is provided.

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    • Measuring Density

      Tutorial

      This tutorial explains the definition of density and explains how to perform density measurements. Guided practice in density calculations is also provided.

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    • Making a Standard Solution from Another Solution: Dilution

      Tutorial

      This tutorial begins with the concept of concentration and expands this to the concept of dilution. It then provides and overview of the calculations and procedure for performing a dilution in the laboratory. Guided…

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      • Virtual Labs

    • Glucose Dilution Problem

      Virtual Lab

      In this activity, students use the virtual lab to create a 0.025M glucose solution from a standard 1M glucose solution. First, they calculate the correct volumes of 1M glucose solution and water to mix together…

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    • Acid Dilution Problem

      Virtual Lab

      In this activity, students use the virtual lab to create 500mL of 3M HCl solution from a concentrated stock solution of 11.6M HCl. They must first calculate the correct volumes of 11.6M HCl solution and water to…

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    • Cola and Sucrose Concentration Problem

      Virtual Lab

      In this activity, students use the virtual lab to prepare a sucrose solution for a soda recipe. They next calculate the concentration of their solution in terms of molarity, percent mass and density. Finally, they…

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    • Making Stock Solutions from Solids

      Virtual Lab

      In this activity, students use the virtual lab to create stock solutions starting from solid salts. Students must first calculate the correct amount of solid to make the solution. Next, they prepare the solution…

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    • Identifying the Unknown Metal (Metals Density Problem)

      Virtual Lab

      In this activity, students use the virtual lab to identify an unknown metal by measuring its density and comparing their measurements to the densities of known metals.

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    • Identifying an Unknown Liquid from its Density

      Virtual Lab

      In this activity students use the virtual lab to design an experiment to determine the identity of mislabeled bottles using the densities of the solutions inside.

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    • Alcohol Density Problem

      Virtual Lab

      Determine the concentration of an alcohol solution from its density.

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  • Reaction Stoichiometry and Limiting Reagents

      Autograded Virtual Labs

    • Determining Reactants and Products in a Solution of DNA

      Autograded Virtual Lab

      In this limiting reagents problem, students are given random volumes and concentrations of DNA solutions and are asked to predict what will remain after a reaction has occurred. Students can check their prediction…

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    • Determine the Concentration of Unknown Silver Nitrate Solution

      Autograded Virtual Lab

      In this limiting reagents problem, students are asked to determine the amount of silver nitrate dissolved in a solution by performing a reaction with solid NaCl. In this randomized activity, each student is given…

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    • Chemical Remediation of Arsenic

      Autograded Virtual Lab

      In this problem, students determine the limiting reagent in a reaction involving the remediation of arsenic from drinking water.

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    • Determining Stoichiometric Coefficients

      Autograded Virtual Lab

      Students use the virtual lab to determine how 4 unknown substances react with each other including their stoichiometric coefficients. In this randomized activity, each student receives a different reaction and…

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      • Scenario-Based Activities

    • Arsenic in Drinking Water

      Scenario-Based Activity

      Set in the context of ground water contamination in Bangladesh, this stoichiometry and analytical chemistry activity examines the issues around identifying wells contaminated with arsenic. (Part of a larger online…

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    • Bioremediation of Oil Spills

      Scenario-Based Activity

      Getting bacteria to eat oil is a powerful approach to cleaning up oil spills, and the first step is adding a bioremediation accelerator to form clumps that the bacteria will eat. In this activity, students perform…

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      • Simulations

    • Stoichiometry Applet

      Simulation

      One of the first numerical problems encountered in introductory chemistry is that of "limiting reagents". This applet serves as a supplement to such calculations, providing imagery that helps students see beyond…

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      • Tutorials

    • Reaction Stoichiometry

      Tutorial

      This tutorial introduces the concept of reaction stoichiometry, determining the amount of substance that is consumed or produced by a reaction. The tutorial then explains how to calculate how much of a reactant…

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    • The Stoichiometry of Product Formation and Percent Yield

      Tutorial

      This tutorial provides on overview in determining the amount of product formed by a reaction. It explains how to perform calculations involving how much product was formed in a chemical reaction and explains theoretical…

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    • Limiting Reagents

      Tutorial

      This tutorial describes how to determine the amount of each reactant that is consumed and each product that is produced in a given chemical reaction. Guided problems as well as a randomized calculation activity…

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      • Virtual Labs

    • Gravimetric Determination of Arsenic

      Virtual Lab

      Set in the context of ground water contamination in Bangladesh, this stoichiometry and analytical chemistry activity examines the issues around identifying wells contaminated with arsenic. (Part of a larger online…

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    • Determining Stoichiometric Coefficients

      Virtual Lab

      In this activity, students use the virtual lab to determine how 4 unknown substances react with each other including their stoichiometric coefficients.

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    • Stoichiometry and Solution Preparation Problem

      Virtual Lab

      In this limiting reagents problem, students mix together solutions in different ratios in an attempt to produce a final solution that contains only 1 product.

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    • Textbook Style Limiting Reagents Problems

      Virtual Lab

      Textbook-style practice limiting reagent exercises with that can be used as a way to "predict and check" your answers using the virtual lab.

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    • Textbook Style Limiting Reagents Problem II

      Virtual Lab

      In this activity, students practice with experiments involving limiting reagents and the test their knowledge to determine the concentration of an unknown solution.

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    • Predicting DNA Concentration

      Virtual Lab

      In this limiting reagents problem, students are given specific concentrations of DNA solutions and are asked to predict what products and reactants will remain after a specific volumes are mixed and reaction has…

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    • Unknown Concentration of DNA Solution Problem

      Virtual Lab

      In this advanced limiting reagent problem, students use the virtual lab to determine the concentration of a solution of DNA by reacting it with known amounts of a fluorescent dye which binds to the DNA.

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  • Empirical Formula and Mixtures

  • Gravimetric Analysis