What gives gas-filled lights their colors?

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Presentation transcript:

What gives gas-filled lights their colors? CHEMISTRY & YOU What gives gas-filled lights their colors? Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra The Nature of Light By the year 1900, there was enough experimental evidence to convince scientists that light consisted of waves. The amplitude of a wave ______ _____________________________ The wavelength, represented by  (the Greek letter lambda), ____ ______________________________________________________. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra The frequency () and wavelength () of light are _________________ proportional to each other. As the wavelength ________________, the frequency ____________________. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra The Nature of Light According to the wave model, light consists of electromagnetic waves. _________________________________ includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays. All electromagnetic waves travel in a vacuum at a speed of _______________m/s. This is the speed of light, represented by c. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra The energy absorbed by an electron for it to move from its current energy level to a higher energy level is ___________________ to the energy of the light emitted by the electron as it drops back to its _______________ energy level. The wavelengths of the spectral lines are characteristic of the element, and they make up the _________________________________ of the element. No two elements have the same __________________ _____________________________. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

An Explanation of Atomic Spectra When an electron has its lowest possible energy, the atom is in its _________________. In the ground state, the principal quantum number (n) is 1. Excitation of the electron by absorbing energy raises the atom to an _______________ state with n = 2, 3, 4, 5, or 6, and so forth. A quantum of energy ___________________ ____________________________________________________________________________ Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

CHEMISTRY & YOU The glass tubes in lighted signs contain helium, neon, argon, krypton, or xenon gas, or a mixture of these gases. Why do the colors of the light depend on the gases that are used? Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.