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Light Producing Chemical Reactions Matthew Landry CHEM 1202 – General Chemistry II Spring Intersession 2012

What is Light? •  The natural agent that stimulates sight and makes things visible •  Electromagnetic radiation from about 390 to 740 nm in wavelength.

Part I: Chemiluminescence •  Certain organic chemical reactions can produce light either by luminescence or phosphorescence. •  Firefly •  Chemical reactions that release energy that is efficiently converted to light, but almost no heat.

Part II: Quantum Fireballs • Fireworks and Pyrotechnics

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Lithium (Li) Sodium (Na) Potassium (K) Calcium (Ca) Strontium (Sr) Copper (Cu)

Part II: Quantum Fireballs • General Reaction M+n ion + Heat Energy à {M+n excited state} à M+n + Light Emitted

Part II: Quantum Fireballs

Each metal has its own light emission profile, due to the differences of electron orbital energies unique to that element.

Part III: Burning Mg in CO2 • Fire extinguishers • The heat produced by this reaction which begins in the open atmosphere is sufficient to decompose the CO2. Mg(s) + CO2 à MgO (s) + C(s)

Light Producing Chemical Reactions Presentation