The Wave Nature of the Electron Lecture Demonstrations

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1. Introduction: The Ambit of Chemistry

What Chemists Do Handling Large and Small Numbers The International System of Units (SI) SI Prefixes Measurements, Quantities, and Unity Factors Errors in Measurement Volume Density Conversion Factors and Functions

2. Atoms, Molecules, and Chemical Reactions

Macroscopic Properties and Microscopic Models The Atomic Theory Macroscopic and Microscopic Views of a Chemical Reaction Testing the Atomic Theory Atomic Weights The Amount of Substance: Moles The Mole The Amount of Substance The Avogadro Constant The Molar Mass Formulas and Composition Balancing Chemical Equations

3. Using Chemical Equations in Calculations

Equations and Mass Relationships The Limiting Reagent Percent Yield Analysis of Compounds Thermochemistry Energy Thermochemical Equations Hess' Law Standard Enthalpies of Formation Solution Concentrations Diluting and Mixing Solutions Titrations

4. The Structure of Atoms

Groups of Related Elements The Periodic Table Valence Exceptions to the Periodic Law Implications of Periodicity for Atomic Theory The Nuclear Atom Radiation The Electron The Nucleus Atomic Structure and Isotopes Isotopes Transmutation and Radioactivity Average Atomic Weights Measurement of Atomic Weights

5. The Electronic Structure of Atoms

Electrons and Valence Lewis Diagrams The Wave Nature of the Electron Wave Mechanics The Uncertainty Principle Electron Waves in the Hydrogen Atom Orbitals Quantum Numbers Coulomb’s Law Potential Energy Electron Density and Potential Energy Atoms Having More Than One Electron Hydrogen, Helium, Lithium Beryllium, Boron, Carbon Electron Configurations Electron Configurations and the Periodic Table

6. Chemical Bonding - Electron Pairs and Octets

7. Further Aspects of Covalent Bonding

Exceptions to the Octet Rule The Shapes of Molecules Molecules with Lone Pairs Multiple Bonds and Molecular Shapes Hybrid Orbitals Orbital Descriptions of Multiple Bonds Sigma and Pi Bonds Polarizability Polar Covalent Bonds Electronegativity Polarity in Polyatomic Molecules Formal Charge and Oxidation Numbers Resonance

8. Properties of Organic Compounds ...

9. Gases

10. Solids, Liquids and Solutions

11. Reactions in Aqueous Solutions

12. Chemistry of the Representative Elements

Group IA: Alkali Metals Group IIA: Alkaline Earths Group IIIA Group IVA Group VA Group VIA: Chalcogens Group VIIA: Halogens Group VIIIA: Noble Gases

13. Chemical Equilibrium

The Equilibrium State The Equilibrium Constant The Law of Chemical Equilibrium The Equilibrium Constant in Terms of Pressure Calculating the Extent of a Reaction Successive Approximation Predicting the Direction of a Reaction Le Chatelier’s Principle The Effect of a Change in Pressure The Effect of a Change in Temperature Effect of Adding a Reactant or Product The Molecular View of Equilibrium

14. Ionic Equilibria in Aqueous Solutions

Ionization of Water pH and pOH The pH of Solutions of Weak Acids The pH of Solutions of Weak Bases Polyprotic Acids and Bases Conjugate Acid-Base Pairs and pH Buffer Solutions Indicators Titration Curves The Solubility Product The Common-Ion Effect The Solubilities of Salts of Weak Acids

15. Thermodynamics: Atoms, Molecules and Energy

Heat Capacities Heat Capacity and Microscopic Changes Internal Energy Thermodynamic Terms and Conventions Enthalpy Measuring the Enthalpy Change State Functions Standard Pressure Bond Enthalpies Bond Enthalpies and Exothermic or Endothermic Reactions Fossil Fuels and the Energy Crisis Photosynthesis

16. Entropy and Spontaneous Reactions

17. Electrochemical Cells

Electrolysis Electrolysis of Brine Aluminum Production Refining of Copper Electroplating Quantitative Aspects of Electrolysis Galvanic Cells Cell Notation and Conventions Electromotive Force of Galvanic Cells Storage Batteries Fuel Cells Galvanic Cells and Free Energy Cells at Non-Standard Conditions

18. Chemical Kinetics

The Rate of Reaction The Rate Equation Microscopic View of Chemical Reactions Unimolecular Processes Bimolecular Processes Termolecular Processes Reaction Mechanisms Increasing the Rate of a Reaction The Effect of Temperature Catalysis Heterogeneous Catalysis

19. Nuclear Chemistry

Naturally Occurring Radioactivity Radioactive Series Artificially Induced Nuclear Reactions Bombardment with Positive Ions Neutron Bombardment Further Modes of Decay Nuclear Stability The Rate of Radioactive Decay Instruments for Radiation Detection Units of Radiation Dose Uses of Artificial Isotopes Mass-Energy Relationships Nuclear Fission Nuclear Power Plants Breeder Reactors Nuclear Fusion

20. Molecules in Living Systems

21. Spectra and Structure of Atoms and Molecules

The Nature of Electromagnetic Radiation Atomic Spectra and the Bohr Theory Bohr Theory of the Atom The Spectra of Molecules: Infrared The Visible and Ultraviolet Spectra of Molecules: Molecular Orbitals Molecular Orbitals Delocalized Electrons Conjugated Systems

22. Metals

Metallic Bonding Metallurgy Beneficiation Reduction of Metals Refining of Metals Corrosion Coordination Compounds Geometry of Complexes Chelating Agents Transitional Metal Ions in Aqueous Solutions

Energy is Proportional to Frequency

Commercial Photoelectric Effect Demonstrators are excellent for this purpose, but if one is not available:

Tape a piece of plastic diffraction grating to the lens of an overhead projector, as in Figure, and place an opaque cover on the Fresnel lens as shown, to project a continuous spectrum.

Projecting a Spectrum

On the wall, tape a piece of phosphorescent sheeting ^[1] protected from room lights with a cover made from file folders (etc).

Dim the room lights, and project the spectrum on the phosphorescent material as shown. After several seconds, turn off the projector, and observe that the greatest phosphorescent intensity is below the visible range.

Electric Pickle Demonstrations^[2]

Use metal forks connected to the AC output of a Variac to excite the sodium wavelength in a dill pickle.

References

↑ http://www.teachersource.com/Chemistry/GlowintheDark/PhosphorescentVinylSheet.aspx
↑ J. Chem. Educ., 2005, 82 (4), p 545

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Category: Lecture Demonstrations

The Wave Nature of the Electron Lecture Demonstrations

From ChemPRIME

Energy is Proportional to Frequency

Electric Pickle Demonstrations^[2]

References

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The Wave Nature of the Electron Lecture Demonstrations

From ChemPRIME

Energy is Proportional to Frequency

Electric Pickle Demonstrations[2]

References

Views

Personal tools

Navigation

Search

Toolbox

Electric Pickle Demonstrations^[2]