Chapter 5 Electrons In Atoms 5.3 Atomic Emission Spectra

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Presentation transcript:

Chapter 5 Electrons In Atoms 5.3 Atomic Emission Spectra 5.1 Revising the Atomic Model 5.2 Electron Arrangement in Atoms 5.3 Atomic Emission Spectra and the Quantum Mechanical Model Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Ground state - electron occupies lowest possible energy level Energy Levels in Atoms Ground state - electron occupies lowest possible energy level Excited state - electron absorbs energy and jumps to a higher energy level When electron returns to ground state, it releases energy in the form of light Emission Line Spectra http://chemistry.bd.psu.edu/jircitano/periodic4.html Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra Light consists of electromagnetic waves. Amplitude - wave height Wavelength () - distance between the crests. Frequency () - number of wave cycles to pass a given point per unit of time. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra Speed of Light = wavelength x frequency c = 2.998  108 m/s. c = ln Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra Frequency () and wavelength () are inversely proportional. As one increases the other decreases. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Light and Atomic Emission Spectra Low energy ( = 700 nm) High energy ( = 380 nm) Frequency  (s-1) 3 x 106 3 x 1012 3 x 1022 102 10-8 10-14 Wavelength  (m) Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Calculating the Wavelength of Light Sample Problem 5.2 Calculating the Wavelength of Light Calculate the wavelength of the yellow light emitted by a sodium lamp if the frequency of the radiation is 5.09 × 1014 Hz (5.09 × 1014/s). Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Sample Problem 5.2 c = ln Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

What is the frequency of a red laser that has a wavelength of 676 nm What is the frequency of a red laser that has a wavelength of 676 nm? Note: 1 m = 109 nm Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

What is the frequency of a red laser that has a wavelength of 676 nm? c = ln c   =  = = = 4.43  1014 Hz c 2.998  108 m/s  6.76  10–7 m Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

The Quantum Mechanical Model Do Now A green light has a wavelength of 5.30 x 10-7 m. Calculate the frequency of this light. c = 3.0x108 m/s A violet light has a frequency of 7.5 x 1014 Hz. Calculate the wavelength of this light. Convert your answer for #2 to nanometers. 1m = 109 nm Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

The Quantum Concept and Photons Energy Planck assumed energy is quantized Energy of a single quantum is proportional to the frequency of radiation emitted h = Plank’s Constant = 6.626 x 10-34 J·s E = hn Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Calculating the Energy of a Photon Sample Problem 5.3 Calculating the Energy of a Photon What is the energy of a photon of microwave radiation with a frequency of 3.20 × 1011/s? Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

E = h  = (6.626  10–34 J·s)  (3.20  1011/s) = 2.12  10–22 J Sample Problem 5.3 E = h  = (6.626  10–34 J·s)  (3.20  1011/s) = 2.12  10–22 J Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

What is the frequency of a photon whose energy is 1.166  10–17 J? Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

What is the frequency of a photon whose energy is 1.166  10–17 J? E = h n n = h E  = = = 1.760  1016 Hz 6.626  10–34 J 1.166  10–17 J·s E h Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

END OF 5. 3 EM Waves https://www. youtube. com/watch END OF 5.3 EM Waves https://www.youtube.com/watch?v=cfXzwh3KadE Fireworks https://www.youtube.com/watch?v=nPHegSulI_M Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.