Curated OER
Moles, Stoichiometry, and Concentration
In this stoichiometry activity, students practice calculating moles, molar mass, and percentage composition of given compounds. This activity has 55 problems to solve.
Curated OER
Chemistry Word Search
In this chemistry worksheet, students locate and identify various vocabulary terms related to chemistry. There are nine words/phrases located in the puzzle to find.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Build a Molecule
Starting from atoms, see how many molecules you can build. Collect your molecules and see them in 3D.
CK-12 Foundation
Ck 12: Percent Composition and Empirical & Molecular Formulas
[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will learn to calculate the percent composition of a compound either from mass data or from the chemical formula. They will use...
CK-12 Foundation
Ck 12: Chemical Formulas
[Free Registration/Login may be required to access all resource tools.] Students will use a chemical formula or mass data to calculate the percent composition of a compound, and then calculate the empirical or molecular formula for a...
Texas A&M University
Texas A&m: Steps for Determining an Empirical Formula
The steps for determining an empirical formula are listed on this site. Also, it tells how to determine the molecular formula from an empirical formula. Two example problems are worked through step by step.
Michael Blaber, PhD
Florida State Univ.: Stoichiometry: Chemical Formulas and Equations
Determining empirical formula from analytical data, and determing molecular formula from empirical formula, with flow charts and sample calculations.
Towson University
Towson University: Determining Formulae
Explanation of how to calculate empirical and molecular formulas.
Other
Seton Hall University: Using Mass Percent
Slides in presentation show how to use mass percent to calculate empirical and molecular formulas.
University of Nebraska
University of Nebraska: Determining a Molecular Formula
This is a seven part site from the University of Nebraska on molecular formulas. Sections are: Introduction, Purpose, General Safety Considerations, Procedure, Data Analysis and Concept Development, Implications and Applications,...
Clackamas Community College
Clackamas Community College: Molecular Formulas
Discussion of molecular formula and how to determine it from empirical formula. Practice problems are available.
CK-12 Foundation
Ck 12: Chemistry: Molecular Formula
[Free Registration/Login may be required to access all resource tools.] Defines molecular formula and describes how to write molecular formulas.
CK-12 Foundation
Ck 12: Plix: Molecular Formula
[Free Registration/Login Required] In this interactive you will move the end of each arrow to connect the label with the correct model of each molecule. You will need a sign-in to access this media, but it will be well worth your time!
Sophia Learning
Sophia: Octet Rule
Learn about the octet rule and ionic bonds in this slide show presentation. Then find out how to start a molecular formula.
Chiral Publishing
Chiral Publishing: An Introduction to Chemistry: Determination of Empirical and Molecular Formulas:
Listen as this audio book shows the determination of empirical and molecular formulas. View the formula to calculate empirical and molecular formulas and the written steps for calculating.
Other
Okanagan University College: Basic Organic Nomenclature
This site from the Okanagan University College has basic descriptions of organic cycloalkanes. Explanations of drawings and examples are provided.
Other
University of South Carolina: Molecular Formula
A brief explanation of the relationship between molecular formula and empirical formula.