Chemistry Chapter 6 Flashcards

Questions and Answers

Describe two ways atoms can become excited.

Atoms can become excited through collisions with other atoms or electrons or by absorbing a photon.

Which energy transition requires the greatest amount of energy for an electron in a helium atom?

Second to third energy level

First to third energy level

First to second energy level

First to fourth energy level (correct)

Which energy transition requires the least amount of energy for an electron in a helium atom?

Second to third energy level

First to second energy level (correct)

First to fourth energy level

First to third energy level

When an electron returns to its original energy level, which transition emits a photon of higher frequency?

Fourth to first energy level Signup and view all the answers

What kind of spectrum does a neon light produce?

Emission spectrum Signup and view all the answers

What kind of spectrum does a hot, dense object that is surrounded by a cooler gas produce?

Absorption spectrum Signup and view all the answers

What kind of spectrum does a hot, dense object produce?

Continuous spectrum Signup and view all the answers

What kind of spectrum does a hot, low-density gas produce?

Emission spectrum Signup and view all the answers

How do astronomers know if there is sodium on the Sun?

Scientists compare the spectrum of sodium on Earth with the Sun's spectrum and find the same pattern of spectral lines. Signup and view all the answers

Study Notes

Energy Excitation of Atoms

Atoms gain energy through collisions with other atoms or electrons.
Photon absorption is another method for atoms to become excited energetically.

Helium Atom Energy Transitions

Transition from the first to the fourth energy level requires the greatest energy.
Transition from the first to the second energy level requires the least energy.
Returning from the fourth to the first energy level emits a photon with the highest frequency.
Transitioning from the second to the first energy level emits a photon with the lowest frequency.

Spectra Produced by Neon Lights

Neon lights create an emission spectrum due to low-density neon gas ignited by electric current.

Spectra from Hot Dense Objects

A hot, dense object surrounded by cooler gas produces an absorption spectrum, as per Kirchhoff's rule III.

Continuous Spectrum from Dense Objects

A hot, dense object alone generates a continuous spectrum, according to Kirchhoff's rule I.

Emission Spectrum from Low-Density Gas

A hot, low-density gas produces an emission spectrum, in accordance with Kirchhoff's rule II.

Astronomical Identification of Elements

Astronomers determine the presence of elements like sodium on the Sun by comparing its spectral lines to known spectra on Earth.
Each element has a unique spectral signature, aiding in the identification of various elements in celestial bodies.

Description

This set of flashcards focuses on key concepts from Chapter 6 of Chemistry. It covers how atoms gain energy and discusses energy levels in helium atoms. Use these flashcards to test your understanding of atomic structure and energy transitions.