Chapter+4+Webquest



The Arrangement of Electrons in Atoms Introduction: Towards the end of the nineteenth century, scientists knew of the existance of electrons, and that these electrons gave off light. When they passed electric current through a vacuum tube containing a gas at low pressure, the gas appeared to glow. When a beam of this light was shined through a prism, it was separated into very specific bands of color. Different gases produced a different number, pattern, and color of these bands. It's kind of like when sunlight passes through droplets of moisture and forms a rainbow. We will explore the electromagnetic spectrum, from radio waves to cosmic waves.



  Your Task: Your task is to explain the relationship between speed, frequency, and wavelength of the electromagnetic spectrum. You will discuss the significance of the Bohr model of the hydrogen atom, and its impact on the development of the quantum model of the atom.



[|Nils Bohr]

The Process: You are going to prepare a report that describes how the quantum model of the atom was developed. In order to do this, you will need to answer all of the questions below. The answers to these questions will provide you with the information that is necessary to complete this project. The paper is worth a total of 50 points.   1. Define electromagnetic radiation, and describe the different types that are part of the electromagnetic spectrum.

2. Discuss the relationship between frequency, energy, and wavelength, as it applies to the electromagnetic spectrum.

3. Distinguish between the wave- and particle- natures of light.

[|Waving..]

4. Explain the behavior of electrons as they give off energy in the form of electromagnetic radiation.

5. Describe the Bohr Model of the hydrogen atom. Explain what was wrong with this model, and how it led to the development of the quantum model of the atom.  

Resources: Here are some websites to help you begin your quest. Feel free to use any additional resources as you search for information.

[|electromagnetic radiation]From NASA's 'Imagine the Universe'

[|relationship of wavelength and frequency] From The University of Colorado Science Trek

[|spectral lines] University of Colorado Science Trek

[|x-rays] Nobel Foundation

[|neon signs] About.com


 * Evaluation**
 * = == Research Report : Chapter 4 Webquest Report ==

||


 * CATEGORY || ** 10 ** || ** 6 ** || ** 3 ** || ** 1 ** ||
 * ** Organization ** || Information is very organized with well-constructed paragraphs and subheadings. || Information is organized with well-constructed paragraphs. || Information is organized, but paragraphs are not well-constructed. || The information appears to be disorganized. 8) ||
 * ** Quality of Information ** || Information clearly relates to the main topic. It includes several supporting details and/or examples. || Information clearly relates to the main topic. It provides 1-2 supporting details and/or examples. || Information clearly relates to the main topic. No details and/or examples are given. || Information has little or nothing to do with the main topic. ||
 * ** Mechanics ** || No grammatical, spelling or punctuation errors. || Almost no grammatical, spelling or punctuation errors || A few grammatical spelling, or punctuation errors. || Many grammatical, spelling, or punctuation errors. ||
 * ** Paragraph Construction ** || All paragraphs include introductory sentence, explanations or details, and concluding sentence. || Most paragraphs include introductory sentence, explanations or details, and concluding sentence. || Paragraphs included related information but were typically not constructed well. || Paragraphing structure was not clear and sentences were not typically related within the paragraphs. ||
 * ** Amount of Information ** || All topics are addressed and all questions answered with at least 2 sentences about each. || All topics are addressed and most questions answered with at least 2 sentences about each. || All topics are addressed, and most questions answered with 1 sentence about each. || One or more topics were not addressed. ||

 Conclusion: After completing the WebQuest, we hope that you will have a solid understanding of the development of the quantum model of the atom. You may want to take your understanding of electromagnetic radiation to the next level: perhaps a study of x-rays in medicine, or x-rays in space!