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The ChemCollective
>> Find activities
>> Virtual Lab Problem List
Current Collection of Virtual Lab Problems
 You can access the problems below via
the Load Homework dialogue in the File menu of the Virtual
Lab. They have been organized by concept and ranked by difficulty
(A ranking of 1 denotes an easier problem; 5 is more challenging).
Word files for these problems are provided so that you may edit and
distribute the assignments in your classroom. We welcome your
comments and suggestions.
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Dilution Problem 1
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Type: Design your own experiment and open ended problems
Description: Dilution of a glucose solution.
Difficulty: 1
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Dilution Problem 2
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Type: Design your own experiment and open ended problems
Description: Preparation of a stock solution from a concentrated acid.
Difficulty: 1
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Sucrose Problem
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Type: Design your own experiment and open ended problems
Description: Molarity, molality, mass percent, mole fraction? Understanding concentrations.
Difficulty: 2
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Making Solutions from solids
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Type: Check your work and design your own experiment and open ended problems
Description: Making salt solutions at different concentration.
Difficulty: 2
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Metals Density Problem
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Type: Design your own experiment and open ended problems
Description: Identify unknown metals from their density.
Difficulty: 2
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Liquid Density Problem
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Type: Design your own experiment and open ended problems
Description: Identify an unknown liquid from its density.
Difficulty: 1
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Alcohol Density Problem
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Type: Design your own experiment and open ended problems
Description: Determine the concentration of an alcohol solution from its density.
Difficulty: 2
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Determining Stoichiometric Coefficients (Oracle)
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Type: Design your own experiment and open ended problems
Description: Limiting reagent problem to determine the stoichiometery of a reaction.
Difficulty: 4
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Stoichiometry and Solution Preparation
Problem (Jello)
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Type: Design your own experiment and open ended problems
Description: In this problem, students mix together solutions in an attempt to control their color change.
Difficulty: 5
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Textbook Style Limiting Reagents
Problems
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Type: Check your work in the virtual lab
Description: Textbook-style practice exercises with limiting reagents.
Difficulty: 1 - 2
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Textbook Style Limiting Reagents Problem
II
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Type: Design your own experiment and open ended problems
Description: Design an experiment to answer a limiting reagent style problem.
Difficulty: 2 - 3
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Predicting DNA Concentration
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Type: Design your own experiment and open ended problems
Description: Predict the results of a limiting reagents problem involving strings of DNA.
Difficulty: 1 - 2
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Unknown DNA Solution Problem
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Type: Design your own experiment and open ended problems
Description: Develop an experiment to determine the concentration of an unlabeled container.
Difficulty: 4
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Unknown Silver Chloride
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Type: Design your own experiment and open ended problems
Description: Determine the concentration of Silver ion in a Silver Nitrate solution.
Difficulty: 3
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Gravimetric Determination of Arsenic
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Type: Design your own experiment and open ended problems
Description: Determine the amount of arsenic present in soil samples.
Difficulty: 2-3
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Cobalt Chloride and LeChatlier’s
Principle
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Type: Accompaniment to in-class demonstration
Description: In this exercise, the popular equilibrium experiment using Cobalt Chloride is
performed by the instructor. Then the students are allowed to safely explore the reaction
equilibrium and LeChatlier’s Principle.
Submitted by Bob Belford
[rbelford@wvu.edu]
Difficulty: 2
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DNA Binding Problem
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Type: Design your own experiment and open ended problems
Description: Exploring equilibrium constants in biochemical systems
Difficulty: 3
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Temperature and the Solubility of
Salts
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Type: Design your own experiment and open ended problems
Description: Examine the solubilities of salts based on temperature.
Difficulty: 2
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Determining the Solubility Product
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Type: Design your own experiment and open ended problems
Description: Determine the solubility product constatnt (Ksp) for various solids.
Difficulty: 2
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Determining the Solubility of Copper Chloride
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Type: Problems that can be checked using the virtual lab
Description: Determine the solubility of CuCl at different temperatures.
Difficulty: 3
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Determining the Heat of Reactions in Aqueous
Solution
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Type: Design your own experiment and open ended problems
Description: Observe and then determine the heat of reactions in aqueous solutions.
Difficulty: 2 - 3
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Coffee
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Type: Design your own experiment and open ended problems
Description: Create a solution of coffee with a desired temerpature.
Difficulty: 2 - 3
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Coolant I
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Type: Design your own experiment and open ended problems
Description: Measure and compare the heat capacity of an unknown liquid.
Difficulty: 2 - 3
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Coolant II
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Type: Design your own experiment and open ended problems
Description: Measure and compare the heat capacity of an unknown liquid with an unknown density.
Difficulty: 3
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Camping I
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Type: Design your own experiment and open ended problems
Description: Measure the enthalpy of a reaction.
Difficulty: 2 - 3
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Camping II
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Type: Design your own experiment and open ended problems
Description: Determine change in the enthalpy of a reaction as the concentration of reactants are varied
Difficulty: 2 - 3
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Camping III
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Type: Design your own experiment and open ended problems
Description: Create solutions that when mixed, increase to a certain temperature.
Difficulty: 2 - 3
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ATP Reaction (Thermochemistry and Bonding)
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Type: Design your own experiment and open ended problems
Description: Determine the enthalpy of the ATP reaction.
Difficulty: 2 - 3
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Strong Acid and Base Problems (Textbook Examples)
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Type: Problems that can be checked using the Virtual Lab
Description: Textbook-style strong acid and base problems that can be checked using the Virtual Lab.
Difficulty: 2
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Weak Acid and Base Problems (Textbook Examples)
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Type: Problems that can be checked using the Virtual Lab
Description: Textbook-style weak acid and base problems that can be checked using the Virtual Lab.
Difficulty: 2
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Determination of the pH Scale by the Method of Successive Dilutions
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Type: Accompaniment to in-class demonstration
Description: In this exercise, the method of successive dilutions was demonstrated using HCl, NaOH,
a pH meter, and universal indicator solution. The students were then given a related in-class activity
using the Virtual Lab.
Submitted by Bob Belford [rbelford@wvu.edu]
Difficulty: 2
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Standardization of NaOH: Acid Base Titration
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Type: Prelab
Description: A collection of questions and exercises to complete before performing an acid/base
titration.
Submitted by Sophia Nussbaum [sophian@chem.ubc.ca]
Difficulty: 3
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Determining the pKa and concentration ratio of a protein in solution
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Type: Design your own experiment and open ended problems
Description: Design an experiment to determine the pKa and concentration ratio of a protein in solution.
Difficulty: 3 - 4
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Unknown Acid and Base problem
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Type: Design your own experiment and open ended problems
Description: In this exercise, students graph the titration curve of an unknown acid and base
to determine their pKa’s and concentrations.
Difficulty: 3
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Creating a Buffer Solution
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Type: Design your own experiment and open ended problems
Description: An exercise to design a buffer solution with specific properties.
Difficulty: 3
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DNA - Dye Binding: Equilibrium and Buffer
Solutions
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Type: Design your own experiment and open ended problems
Description: Students examine equilibrium and buffer solutions in a biological setting.
Difficulty: 4 - 5
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