Bromination of Saturated and Unsaturated Hydrocarbons
Dehydration of Sugar by Sulfuric Acid
Organic Synthesis With Familiar Materials
Oxidation of Primary, Secondary, Tertiary Alcohols
Underwater Fireworks: Chlorination of Acetylene
Differences in Miscibility of Organic Alcohols With Increasing Chain Length
Combustion of Cellulose Nitrate (Guncotton)
Different Smells of Carvone Isomers
Distinguishing Between HD and LD Polyethylene
Enviro-bond: Cleaning Oil Spills
Esterification Using a Dean-Stark Trap
IR Demonstration I – Atomic Coupling
IR Demonstration II – Molecular Vibrations
IR Demonstration III – Molecular Vibrations
Making a Rubber Ball from Latex
Reaction Intermediates in Organic Chemistry
Reducing Sugars and Fehling’s Solution
Rod Climbing by a Polymer Solution
Superabsorbent Polyacrylate Gel
Aniline Hydrochloride-Formaldehyde Polymer
Relative Reactivity of Reducing Agents
Electrophilic Aromatic Substitution Reaction/EAS Reaction
Reactivity of Alkanes vs Aromatic Compounds
Optical Activity of Racemic Mixtures With Limonene
Relationship of Absorbed Light to Observed Color
Density and Miscibility of Liquids
Extraction of Copper Ion from Solution with Orform®
Gel Formation with Sodium Alginate and Calcium Chloride
Hydrolysis of T-Butyl Chloride: A Lecture and Lab Experiment
IR Demonstration III – Molecular Vibrations
Description: Differences in atomic vibrations are simulated by hanging weights from two equivalent springs and a third looser spring. Two of the weights are similar, and the third weighs less. By gently pulling the weights and releasing them, the vibrations of the weights on the springs can be compared to IR vibrations of different bond strengths and different atomic masses.
Source: UW Card Catalog
Year: N/A Vol: N/A Page: N/A
Keywords: Bond strength, Bond length, Molecular vibration, Atomic vibration
Rating: 
Hazard: Low
- Model or simulation
Effectiveness: Good
- Results are clearly observable with guidance
- Medium failure rate
- Good connection from demo to course material
- Time to results is low
- Mild effects are seen by audience
Difficulty: Low
- Simple manipulations for most to perform
- Simple procedures
Safety Precautions:
- Eye protection required
Class: Spectroscopy, Simulations, Molecular Structure
Division: General, Organic Chemistry
Return to General Chemistry Demonstrations