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The ChemCollective >> Find activities >> Virtual Lab Problem List


Current Collection of Virtual Lab Problems

Image: FlaskYou 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.




Molarity and Density


Dilution Problem 1          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Dilution of a glucose solution.
Difficulty: 1



Dilution Problem 2          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Preparation of a stock solution from a concentrated acid.
Difficulty: 1



Sucrose Problem          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Molarity, molality, mass percent, mole fraction? Understanding concentrations.
Difficulty: 2



Making Solutions from solids          Download Assignment: [en] [fr] [es]
  Type: Check your work and design your own experiment and open ended problems
Description: Making salt solutions at different concentration.
Difficulty: 2



Metals Density Problem          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Identify unknown metals from their density.
Difficulty: 2



Liquid Density Problem          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Identify an unknown liquid from its density.
Difficulty: 1



Alcohol Density Problem          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Determine the concentration of an alcohol solution from its density.
Difficulty: 2



Stoichiometry and Limiting Reagents


Determining Stoichiometric Coefficients (Oracle)           Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Limiting reagent problem to determine the stoichiometery of a reaction.
Difficulty: 4



Stoichiometry and Solution Preparation Problem (Jello)          Download Assignment: [en] [fr] [es]
  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



Textbook Style Limiting Reagents Problems          Download Assignment: [en] [fr] [es]
  Type: Check your work in the virtual lab
Description: Textbook-style practice exercises with limiting reagents.
Difficulty: 1 - 2



Textbook Style Limiting Reagents Problem II          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Design an experiment to answer a limiting reagent style problem.
Difficulty: 2 - 3



Predicting DNA Concentration          Download Assignment: [en] [fr] [es]
  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



Unknown DNA Solution Problem          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Develop an experiment to determine the concentration of an unlabeled container.
Difficulty: 4



Quantitative Analysis


Unknown Silver Chloride          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Determine the concentration of Silver ion in a Silver Nitrate solution.
Difficulty: 3



Gravimetric Determination of Arsenic          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Determine the amount of arsenic present in soil samples.
Difficulty: 2-3



Chemical Equilibrium


Cobalt Chloride and LeChatlier’s Principle          Download Assignment: [en] [fr] [es]
  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 at University of Arkansas - Little Rock.

Difficulty: 2



DNA Binding Problem          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Exploring equilibrium constants in biochemical systems
Difficulty: 3



Solubility and Salts


Temperature and the Solubility of Salts          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Examine the solubilities of salts based on temperature.
Difficulty: 2



Determining the Solubility Product          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Determine the solubility product constatnt (Ksp) for various solids.
Difficulty: 2



Determining the Solubility of Copper Chloride          Download Assignment: [en] [fr] [es]
  Type: Problems that can be checked using the virtual lab
Description: Determine the solubility of CuCl at different temperatures.
Difficulty: 3



Thermochemistry


Determining the Heat of Reactions in Aqueous Solution          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Observe and then determine the heat of reactions in aqueous solutions.
Difficulty: 2 - 3



Coffee          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Create a solution of coffee with a desired temerpature.
Difficulty: 2 - 3



Coolant I          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Measure and compare the heat capacity of an unknown liquid.
Difficulty: 2 - 3



Coolant II          Download Assignment: [en] [fr] [es]
  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



Camping I          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Measure the enthalpy of a reaction.
Difficulty: 2 - 3



Camping II          Download Assignment: [en] [fr] [es]
  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



Camping III          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Create solutions that when mixed, increase to a certain temperature.
Difficulty: 2 - 3



ATP Reaction (Thermochemistry and Bonding)           Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems                              
Description: Determine the enthalpy of the ATP reaction.
Difficulty: 2 - 3



Acids and Bases


Strong Acid and Base Problems (Textbook Examples)           Download Assignment: [en] [fr] [es]
  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



Weak Acid and Base Problems (Textbook Examples)           Download Assignment: [en] [fr] [es]
  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



Determination of the pH Scale by the Method of Successive Dilutions           Download Assignment: [en] [fr] [es]
  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 at University of Arkansas - Little Rock.

Difficulty: 2



Standardization of NaOH: Acid Base Titration           Download Assignment: [en] [fr] [es]
  Type: Prelab
Description: A collection of questions and exercises to complete before performing an acid/base titration.
Submitted by Sophia Nussbaum at the University of British Columbia

Difficulty: 3



Determining the pKa and concentration ratio of a protein in solution           Download Assignment: [en] [fr] [es]
  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



Unknown Acid and Base problem          Download Assignment: [en] [fr] [es]
  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



Creating a Buffer Solution          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: An exercise to design a buffer solution with specific properties.
Difficulty: 3



DNA - Dye Binding: Equilibrium and Buffer Solutions          Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Students examine equilibrium and buffer solutions in a biological setting.
Difficulty: 4 - 5



Oxidation-Reduction


Exploring Oxidation-Reduction Reactions           Download Assignment: [en] [fr] [es]
  Type: Design your own experiment and open ended problems
Description: Design an experimen to order Cu, Mg, Zn and Pb from strongest to weakest reducing agent.
Adapted from an activity submitted by Barry Charington at Saskatoon Public Schools.

Difficulty: 2



   Page Last Updated: 04.13.2011