Using My Marbles: Connecting Surface Area and Calorimetry with Temperature Curves and Thermochromic Cups

The importance of surface area can be illustrated by adding spherical solids at known sizes and temperature to other substances at different temperatures and then monitoring the rates of temperature changes of the system over time. Larger spheres (with less surface area per sample) exchanged heat with water more slowly than smaller spheres, and less thermally conductive glass spheres exchanged heat with water more slowly than iron spheres. Additional, more colorful demonstrations are described in which small glass spheres cool thermochromic plastic cups more quickly than larger glass spheres. 

Tom Kuntzleman aka Tommy Technetium

Readers likely recognize Tom Kuntzleman from his numerous ChemEd X blog posts and Journal of Chemical Education articles as well as his dazzling demonstrations on his Tommy Technetium YouTube and TikTok channels! Get to know Tom better in this interview.

Counting Orbitals: Part II

A continuation of Counting Orbitals I: The 'Ah-ha! Moment' and Quantum Numbers. Sit back and adjust your eyeballs for some colorful graphics. 

Using Digital Interactive Notebooks with Dr. Sarah English

On July 14, 2022, Dr. Sarah English provided an overview of the digital interactive notebook process along with guidance on how to start building your own. In this ChemEd X Talk she outlined her organizational plan, examples of notebooks she has created and shares many of the resources she finds helpful in creating them. View a recording of Sarah's presentation and access materials here.

Chemistry Topics

acids/bases applications of chemistry aqueous solution chemistry Atomic Properties / Structure conductivity consumer chemistry Demonstrations density electrochemistry electrolysis equilibrium Food Science gases General Chemistry kinetics Laboratory Instruction liquids magnetic properties metals noncovalent interactions Outreach oxidation/reduction Oxidation / Reduction Phases / Phase Transitions / Diagrams Physical Chemistry physical properties precipitation/solubility Public Understanding reactions solids stoichiometry thermodynamics