Ap Chemistry Chapter 17 Vocab

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Chapter 17 Vocabulary AP CHEMISTRY 1. Electromagnetic radiation: radiant energy that exhibits wave-like behavior and travels through space at the speed of light in a vacuum 2. Wavelength: the distance between two consecutive peaks or troughs in a wave 3. Frequency: the number of waves (cycles) per second that pass a given point in space 4. Planck's constant: the constant relating the change in energy for a system to the frequency of the electromagnatic radiation absorbed or emitted, equal to 6.626 X 10^-34 J 5. Quantization: the concept that energy can occur only in discrete units called quanta 6. Photon: a quantum of electromagnetic radiation 7. Photoelectric effect: ejection of electrons from a substance by incident electromagnetic radiation, especially by visible light 8. E=mc^2: Einstein's equation proposing that energy has mass; E is energy, m is mass, and c is the speed of light 9. Dual nature of light: the statement that light exhibits both wave and particulate properties 10. Diffraction: the scattering of light from a regular array of points of lines, producing constructive and destructive interference 11. Diffraction pattern: the pattern by which diffraction occurs 12. Continuous spectrum: a spectrum that exhibits all the wavelengths of visible light 13. Line Spectrum: a spectrum showing only certain discrete wavelengths 14. Quantum model: The quantum mechanical model is based on quantum theory, which says matter also has properties associated with waves. According to quantum theory, it’s impossible to know the exact position and momentum of an electron at the same time 15. Ground state: the lowest possible energy state of an atom of molecule 16. Standing wave: a stationary wave as on a string of a musical instrument; in the wave mechanical model, the electron in the hydrogen atom is considered to be a standing wave 17. Wave function:

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