# Presentations **Key to Catalog Listings** **Size**: from small \[S\] (benchtop) to extra large \[XL\] (most of the hall) **Setup Time**: <10 min \[t\], 10-15 min \[t+\], >15 min \[t++\] /span> **Rating**: from good \[★\] to wow! \[★★★★\] or not rated \[—\] [ Complete key to listings arrow\_circle\_right ](/key-catalog-listings) [ Demo Subjects arrow\_circle\_right ](/home) Sort & Filters close ## Filters Year of Publication expand\_more 2025 (5) 2024 (9) 2016 (3) 2015 (1) 2012 (1) Search Within Results Search Within Results search ## 432 results Show filters filter\_alt Sort by Year of PublicationAlphabetical A-Z sort ## 432 results Download 432 citations download- [BibTeX](/node/1856711/export?format=bibtex) - [EndNote X3 XML](/node/1856711/export?format=endnote8) - [EndNote 7 XML](/node/1856711/export?format=endnote7) - [Endnote tagged](/node/1856711/export?format=tagged) - [Marc](/node/1856711/export?format=marc) - [PubMedId](/node/1856711/export?format=pubmed_id) - [RIS](/node/1856711/export?format=ris) ### 2025 [Samples of Elements](/presentations/samples-elements). 2025. [Samples of Elements](/presentations/samples-elements). 2025. - add\_circle do\_not\_disturb\_on Abstract A variety of element samples to show on the first day of Gen Chem: compare metals and non-metals; solids, liquid and gas elements; compounds vs. elements. [Wooden Atomic Orbital Models](/presentations/wooden-orbital-models). 2025. [Wooden Atomic Orbital Models](/presentations/wooden-orbital-models). 2025. - add\_circle do\_not\_disturb\_on Abstract A vintage collection of 16 wooden models of the s, p, d, and f atomic orbitals. ![models](/sites/g/files/omnuum7861/files/styles/hwp_1_1__720x720_scale/public/science-demonstrations/files/orbitalmodels-450x300.jpg?itok=W9kHagYb) [Bomb Calorimeter](/publication/bomb-calorimeter). 2025. [Bomb Calorimeter](/publication/bomb-calorimeter). 2025. - add\_circle do\_not\_disturb\_on Abstract An old bomb calorimeter made by the Parr Instrument Company for show-and-tell. Circa 1964. [Effect of Temperature on Nitrogen Dioxide Equilibrium](/publication/effect-temperature-nitrogen-dioxide-equilibrium). 2025. [Effect of Temperature on Nitrogen Dioxide Equilibrium](/publication/effect-temperature-nitrogen-dioxide-equilibrium). 2025. - add\_circle do\_not\_disturb\_on Abstract Sealed tubes of a mixture of NO2 and N2O4 gas are placed in ice water and in boiling water, and an instant change in the equilibrium system is demonstrated, according to Le Chatelier’s Principle. [Weighing Moles](/presentations/weighing-moles). 2025. [Weighing Moles](/presentations/weighing-moles). 2025. - add\_circle do\_not\_disturb\_on Abstract Samples of substances are weighed on a balance. Each is one mole of the substance. ### 2024 [Reaction of Hydrogen and Oxygen](/presentations/reaction-hydrogen-and-oxygen). 2024. [Reaction of Hydrogen and Oxygen](/presentations/reaction-hydrogen-and-oxygen). 2024. - add\_circle do\_not\_disturb\_on Abstract Balloons filled with helium, hydrogen, and hydrogen with oxygen are combusted. Great demo for the first day of class! [Buffer Solution](/presentations/buffer-solution). 2024. [Buffer Solution](/presentations/buffer-solution). 2024. - add\_circle do\_not\_disturb\_on Abstract The ability of a buffer to resist changes in pH is colorfully shown by adding strong acid and base to water and buffer solution with universal indicator. Video link to be added...### How it Works A buffer solution contains both a weak acid and a weak base in... [Liquid Nitrogen Trash Can](/presentations/liquid-nitrogen-trash-can). 2024. [Liquid Nitrogen Trash Can](/presentations/liquid-nitrogen-trash-can). 2024. - add\_circle do\_not\_disturb\_on Abstract ### What it Shows An inverted trash can is launched into the air by an exploding bottle of liquid nitrogen. Embed Link to Liquid Nitrogen Trashcan video can be found here [https://harvard.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=6f33f468-528c-4ab5-acd6](https://harvard.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=6f33f468-528c-4ab5-acd6-b1af00cd80f1)... [Flaming Vapor Ramp](/presentations/flaming-vapor-ramp). 2024. [Flaming Vapor Ramp](/presentations/flaming-vapor-ramp). 2024. - add\_circle do\_not\_disturb\_on Abstract ### What it Shows Cyclohexane vapor catches on fire when it flows downwards to a burning candle at the bottom of a ramp. ### How it Works Cyclohexane is a clear, organic liquid with a formula of C6H12. ![Cyclohexane structure with labeled hydrogens in chair conformation](/sites/g/files/omnuum7861/files/styles/hwp_1_1__360x360_scale/public/science-demonstrations/files/256px-cyclohexane_with_h.svg_.png?itok=UEI1XzSL) Because cyclohexane is a nonpolar molecule with only weak... [Equilibrium of Iron (III) Thiocyanate](/presentations/equilibrium-iron-iii-thiocyanate). 2024. [Equilibrium of Iron (III) Thiocyanate](/presentations/equilibrium-iron-iii-thiocyanate). 2024. - add\_circle do\_not\_disturb\_on Abstract ### What it Shows Le Chatelier’s principle is demonstrated by color changes that result from the addition of solid chemicals to the iron (III) thiocyanate equilibrium system. Embed Link to Equilibrium of Iron (III) Thiocyanate video can be found here [https:/](https://harvard.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=d12cdb20-d654-4a48-a96c-ae370148a6c2)... [Bromothymol Blue to Yellow by Breath](/presentations/bromothymolblue). 2024. [Bromothymol Blue to Yellow by Breath](/presentations/bromothymolblue). 2024. - add\_circle do\_not\_disturb\_on Abstract A solution with bromothymol blue indicator changes from blue to yellow as the instructor blows into the liquid with a straw. Video of Professor's Acid Breath can be found here ### What it Shows A person’s breath contains carbon... [Canned Heat - Colorful Flaming Gel](/presentations/canned-heat-colorful-flaming-gel). 2024. [Canned Heat - Colorful Flaming Gel](/presentations/canned-heat-colorful-flaming-gel). 2024. - add\_circle do\_not\_disturb\_on Abstract Calcium acetate and ethanol form a flammable gel that gives off enough heat to keep food hot! Additional chemicals can be added to color the flame. Video of this demo is available at [https://youtu.be/d0yP9Pvj-Yk?si=oPXINddIKNj\_PiHD](https://youtu.be/d0yP9Pvj-Yk?si=oPXINddIKNj_PiHD)### What it Shows When... - Previous page chevron\_left - [1](?page=0 "Current page") - [2](?page=1 "Go to page 2") - [3](?page=2 "Go to page 3") - [ Last page 36 ](?page=35 "Go to last page") - [ Next page chevron\_right ](?page=1 "Go to next page")