Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light...

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Chapter 1 Section 5 Electronic Behavior of Atoms

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Transcript of Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light...

Page 1: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chapter 1 Section 5

Electronic Behavior of Atoms

Page 2: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

January 27, 2012HW: 1.4 CTG p. 43 #1-11 (Due Wed)

LODescribe how light is created.Explain how wavelengths of light

relate to energy levels in the atom.

SCView the spectrum of hydrogen.Interpret changes in electron

energies in the hydrogen atom to develop an explanation for where the colored light in the hydrogen spectrum comes from.

Use Bohr’s model of the atom to predict parts of the hydrogen-atom spectrum.

Compare the wavelengths, energies, and frequencies of light of different colors.

Identify regions in the electromagnetic spectrum.

Explain the photoelectric effect.

Do NowGrade 1.4 QuizCopy LO and SCWDYS, WDYT p. 35

AgendaWDYS, WDYTInvestigationChem TalkSummary

Page 3: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Investigate

Read through and complete numbers 1 and 2You MUST draw diagrams with what you see that include the colors

Page 4: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.
Page 5: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Investigation

Complete numbers 3 and 4 on pg. 36Be ready to discuss as a class!

Page 6: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Investigation

Complete numbers 5-9, reading through each of the explanations and answering the questions.Pay close attention to the diagram on p. 38

Page 7: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Date:HW: CTG p. 43 #1-11

LODescribe how light is created.Explain how wavelengths of light

relate to energy levels in the atom.

SCView the spectrum of hydrogen.Interpret changes in electron

energies in the hydrogen atom to develop an explanation for where the colored light in the hydrogen spectrum comes from.

Use Bohr’s model of the atom to predict parts of the hydrogen-atom spectrum.

Compare the wavelengths, energies, and frequencies of light of different colors.

Identify regions in the electromagnetic spectrum.

Explain the photoelectric effect.

Do NowCopy LO and SCWDYS, WDYT p. 35

AgendaWDYS, WDYTInvestigationChem TalkSummary

Page 8: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Talk

Skim through the chem talk on p. 39Do not take notes!

Page 9: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

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Page 10: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

Who was Niels Bohr?

What did he discover?

Page 11: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

Who was Niels Bohr?

What did he discover?

A Danish Physicist

He thought that electrons took a circular orbit around an atom and that they jump between energy levels while taking in energy and forming light

Page 12: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.
Page 13: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

From Bohr’s Model

Page 14: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What is light

What is frequency?

Page 15: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What is light

What is frequency?

Photons, or packets of energy, that travel in waves.Come from energy level transfers

Page 16: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What is light

What is frequency?

Photons, or packets of energy, that travel in waves.Come from energy level transfers

The number of cycles per second, measured in Hz usually

Page 17: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What is wavelength

What is the speed of light?

Page 18: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What is wavelength

What is the speed of light?

The distance from crest to crest in a wave.

Page 19: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What is wavelength

What is the speed of light?

The distance from crest to crest in a wave.

3x108 m/s, and it is constant!

Page 20: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Wave Diagram

Page 21: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

How do we calculate frequency using wavelength?

Page 22: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

How are wavelength and energy related?

Page 23: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

How are wavelength and energy related?

They are inversely related!

As E increases, the wavelength gets smaller!

Page 24: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What are photons?

How can we calculate frequency from energy?

Page 25: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What are photons?

How can we calculate frequency from energy?

Fixed packets of energy with a specific wavelength.

Page 26: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What are photons?

How can we calculate frequency from energy?

Fixed packets of energy with a specific wavelength.

Where h is plancks constant: 6.63x10-

34 Js

Page 27: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What is the photoelectric effect?

Page 28: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What is the photoelectric effect?

When light collides with an atom, it interacts with an electron, causing it to be thrown off of the atom due to the fixed amount of energy of the photon.

Page 29: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What were the weaknesses of the Bohr Model?

Page 30: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Notes

What were the weaknesses of the Bohr Model?

1. It could only account for the light transitions of the Hydrogen atom

2. Could not explain why some transitions were allowed while others were not.

Page 31: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Practice Problem

What is the frequency of light that has a wavelength of 432.4nm?

Page 32: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Practice Problem

Using Planck’s constant, what is the energy of red light?

Page 33: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Practice ProblemIn hydrogen the energy change of an electron jumping from E3 to E2 is 3.03 x 10-19 J

What is the frequency?

What is the wavelength? (and therefore color)

Page 34: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Chem Talk

Complete the checking up questions.

Page 35: Electronic Behavior of Atoms. LO Describe how light is created. Explain how wavelengths of light relate to energy levels in the atom. SC View the spectrum.

Summary

Essential Questions, p. 42--How do you know?--Why do you believe--Why should you care

LO and SC reflection


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