Questions and Answers
Why does a sodium street lamp give off a yellow color, whereas a neon light gives off a red color?
Because the substances absorb and emit different wavelengths of light.
Describe the energy levels of electrons in an atom.
There are 7 energy levels with 1 being the closest to the nucleus and 7 being the furthest away. Energy level 1 has the least amount of energy while 7 has the most.
Why do some elements produce colorful flames?
Because chemical elements have different emission spectra.
How can you identify an unknown element using a flame test?
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Write the electron configuration for lithium, sodium, and potassium.
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Study Notes
Sodium vs Neon Light Emissions
- Sodium street lamps emit a yellow color due to the absorption and emission of specific wavelengths of light.
- Neon lights produce a red color because of a different set of wavelengths.
Electron Energy Levels
- There are seven principal energy levels (n=1 to n=7) within an atom.
- Energy level 1 is closest to the nucleus and has the lowest energy, while energy level 7 is farthest and possesses the highest energy.
Colorful Flames and Emission Spectra
- Different elements have unique emission spectra, which results in the production of various flame colors when heated.
Flame Test for Identifying Elements
- An unknown element can be identified by the specific color of flame it produces during a flame test.
Electron Configurations
- Lithium: 1s²2s¹
- Sodium: 1s²2s²2p⁶3s¹
- Potassium: 1s²2s²2p⁶3s²3p⁶4s¹
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Description
Test your understanding of key concepts in chemistry with these flashcards designed for Pre-Lab 5. Explore topics such as the color produced by sodium street lamps and the energy levels of electrons in an atom. Perfect for reinforcing knowledge prior to lab activities.
