Boiling Water Demonstration: Heating Curve

Heating water from room temperature to boiling water and measuring the temperature of the liquid versus time produces a portion of the Heating Curve for water.
Heating Water Boiling Water Heating Curve Demo

Graham's Law of Diffusion: Helium Voice Wizard of Oz Munchkins

Instructors and the Lecture Demonstrator dress up as the Lollipop Guild people in the Wizard of Oz and sing the Lollipop Guild song with Helium gas in their voice box
Lollipop Guild Wizard of Oz Image956

Collapsing Can: Gas Laws Atmospheric Pressure

A small amount of water is heated to boiling in a metal can (aluminum soda/pop can or large 20 L solvent can) filling it with water vapor. The can is removed from heat, sealed, and cooled. Alternatively, a vacuum is applied to an empty can, as the air in the can is evacuated, the can collapses. In both cases the can collapses quickly and dramatically. The collapsing of the can is due to the greater applied atmospheric pressure compared to the less pressure inside the can.
Collapsing Can Demonstration image261

Daniell Electrochemical Cell (Galvanic Cell) and the Gravity Galvanic Cell

In the original version of the Daniell cell a porous cup containing sulfuric acid and a zinc electrode is placed in a copper container filled with 1.0 M copper(II) sulfate solution.
DaniellCell image28

Electric Pickle

A whole pickle is placed between two metal electrodes and electricity is passed through the pickle. The characteristic color of a sodium vapor lamp is emitted.
Electric Pickle Demonstration

Heat of Neutralization Reaction II: HCl(aq) + NaOH(aq) Amounts of Reactants

Amounts of reactants influences the change in temperature and the heat exchanged during an acid-base neutralization reaction, HCl(aq) + NaOH(aq), but the value for the change in enthalpy is constant.
3M HCl + 3M NaOH Calorimetry Demo

Heat of Neutralization: HCl(aq) + NaOH(aq)

Heat of Neutralization: The initial temperature of 50.0 mL of 3.0 M HCl and a 3.0 M NaOH are measured using a digital thermometer probe. The HCl and NaOH react a calorimeter. The final temperature of the resultant solution is measured. The heat exchanged between the chemcial reaction and the solution is calculated. The change in enthalpy of the reaction, ∆H, the heat of neutralization is determined.
HCl and NaOH react in a calorimeter: Heat of Neutralization

Comparing Specific Heats of Metals

Comparing specific heats of metals, a guided-inquiry investigation. Two metal samples (Al and Pb) have the same mass and the same intitial temperature are each placed in separate 50.0 grams of cool water at the same temperature. Which metal will raise the temperature of the 50 grams of water the most? The metal with the higher specific heat will release more heat as it cools and thus will raise the temperature of water more compared to a metal with a lower specific heat. This interactive demonstration focuses on helping students gain a better conceptual understanding of heat, temperature, and specific heat.
Calorimeter Diagram Image12


© Copyright 2012 Email: Randy Sullivan, University of Oregon Chemistry Department and UO Libraries Interactive Media Group