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Chemistry — Review of Stoichiometry Open & Free

Stoichiometry instruction and virtual labs embedded in the real-world scenario surrounding arsenic concentrations in the drinking water supply in Bangladesh.
Learn about Open & Free OLI courses by visiting the “Open & Free features” tab below.


This is a complete course in chemical stoichiometry, which is a set of tools chemists use to count molecules and determine the amounts of substances consumed and produced by reactions. The course is set in a scenario that shows how stoichiometry calculations are used in real-world situations. The list of topics (see below) is similar to that of a high school chemistry course, although with a greater focus on reactions occurring in solution and on the use of the ideas to design and carry out experiments.

Topics Covered:

  • Dimensional Analysis
  • the Mole
  • Empirical Formulas
  • Limiting Reagents
  • Titrations
  • Reactions Involving Mixtures

Course structure

The learning experience in the Stoichiometry course is constructed from the following types of components:

  1. Videos that introduce the scenarios and chemical concepts, and provide worked examples of stoichiometry computations.
  2. Scaffolded homework activities provide learners with hints and feedback on an as-needed basis, and fade this help appropriately such that learners remain challenged but not floundering.
  3. Virtual laboratory activities that couple the mathematics of the course with authentic chemistry experiments, helping learners see how their calculations relate to chemistry practice. The Virtual Laboratory is a simulation-based learning environment for aqueous chemistry. It allows learners to select from hundreds of standard reagents and manipulate them in a manner that resembles that of a real lab.

The Open & Free Chemistry course does not include access to the end-of-module graded exams or to the course instructor. No credit is awarded for completing the Open & Free Chemistry course.

The course also uses a real-world scenario — arsenic contamination of the Bangladesh’s water supply — to motivate and organize the content. Traditional courses tend to follow a bottom-up approach to learning chemistry. This traditional approach teaches abstract concepts and tools before discussing their practical application, which results in students learning bits of unconnected knowledge that are rarely usable let alone memorable. In this stoichiometry course, scenarios are used both to motivate the material and to provide a framework in which students can organize their knowledge.

Open & Free features

Open & Free Courses

  • Open & Free OLI courses enable independent learners to study a subject on their own terms, at their leisure. Courses are:

    • Self-guided.
    • Self-paced.
    • Self-supported.
  • Open & Free courses include only the learning materials:

    • No teacher.
    • No tests.
    • No college credit.
    • No certificate of completion.
  • *If your teacher gave you a Course Key, do not use an Open & Free course because your teacher will never see your work.

What students will learn

By the time they finish this course, students will have:

  • Obtained a full refresher course on Stoichiometry
  • Approached the concepts from within a real-world scenario, applying knowledge directly to solving problems
  • Worked through numerous virtual lab exercises to get a flavor for what real techniques are used in the field

Learning objectives by module

Coming soon.

Course activities and outline

UNIT 1: Stoichiometry I

Module 1: Introduction

Module 2: The mole

Module 3: The arsenic problem in Bangladesh

Module 4: Measuring arsenic in the lab

Module 5: Basic tools of stoichiometry

Module 6: Testing water for arsenic contamination

Module 7: Using density to check arsenic concentrations

Module 8: Arsenic remediation

Module 9: Unit recap

UNIT 2: Stoichiometry II

Module 10: Empirical formula

Module 11: Reaction stoichiometry

Module 12: Limiting reagents

Module 13: Titration

Module 14: Analysis of mixtures

Module 15: Unit recap

Other course details

The list of topics (see below) is similar to that of a high school chemistry course, although with a greater focus on reactions occurring in solution and on the use of the ideas to design and carry out experiments. Its 15 modules will take approximately four to five weeks at a pace of three modules per week (accounting for the fact that Introduction and Recap modules take less time).

System requirements

OLI system requirements, regardless of course:

  • internet access
  • an operating system that supports the latest browser update
  • the latest browser update (Chrome recommended; Firefox, Safari supported; Edge and Internet Explorer are supported but not recommended)
  • pop-ups enabled
  • cookies enabled

Some courses include exercises with exceptions to these requirements, such as technology that cannot be used on mobile devices.

This course’s system requirements:

  • A full desktop operating system, such as Windows or Mac OS X.
  • Flash
  • Java
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