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CSU CHEM 111 Krummel
General Chemistry 1 Exam 1 Chapter 7
46
Chemistry
Undergraduate 1
02/05/2013

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Term
Visible light, x-rays, and microwaves are all examples of what?
Definition
Electromagnetic radiation (electromagnetic energy or radiant energy).
Term
What is frequency of a wave?
Definition
The number of cycles it undergoes per second.
Term
What is the unit for frequency?
Definition
Hertz (Hz) (1/s or s-1).
Term
What is wavelength?
Definition
The distance the wave travels during one cycle.
Term
What is the unit for wavelength?
Definition
Meters, nm, or angstroms (non-SI).
Term
What is the equation for the speed of light?
Definition
c=ν+λ
Term
What does λ stand for?
Definition
Wavelength.
Term
What does ν stand for?
Definition
Frequency.
Term
What is the height of the crest or depth of the trough of a wave?
Definition
Amplitude.
Term
What is light of a single wavelength called?
Definition
Monochromatic.
Term

What is light of many wavelengths called?

 

Definition
Polychromatic.
Term
Is white light monochromatic or polychromatic?
Definition
Polychromatic.
Term
Are shorter wavelengths to the left or right of the visible spectrum?
Definition
Left.
Term
Are frequencies higher or lower to the left of the visible spectrum?
Definition
Higher.
Term
What does the angle of refraction depend on?
Definition
The two media and the wavelength of the light.
Term
What is it called when white light is separated into its componet colors when it passes through a prism?
Definition
Dispersion.
Term
How does refraction of a light wave differ from a particle of matter?
Definition
The speed of a light wave changes immediately, bending its path. The speed of a particle of matter continues to change gradually.
Term
What is it called when a wave strikes the edge of an object and bends around it?
Definition
Diffraction.
Term
What is a quantum of energy equal to?
Definition
hv (h=Planck's constant and v=frequency).
Term
What is the photoelectric effect?
Definition
When monochromatic light of sufficient frequency shines on a metal plate, a current flows.
Term
What are quantized "bundles" of energy called?
Definition
Photons.
Term
What is the energy in absorbing or emitting a photon related to? What is it NOT related to?
Definition
Frequency. NOT amplitude.
Term
When light from electrically excited gaseous atoms passes through a slit and is refracted by a prism, what is created?
Definition
A line spectrum. NOT a continuous spectrum.Ryd
Term
What equation is used to predict the position and wavelength of any line in a given series?
Definition
Rydberg equation.
Term
The higher the energy level, the ______ the electron's orbit is from the nucleus.
Definition
Farther.
Term
The lower the electron's n value (energy), the _____ the radius of the orbit and the _____ the energy level.
Definition
Lower. Lower.
Term
When an electron is in the first orbit, it is called what?
Definition
Ground state.
Term
If the electron is in any orbit farther from the nucleus, the atom is said to be in what?
Definition
An excited state.
Term
What orbit is considered the second excited state?
Definition
Third orbit.
Term
What orbit is considered the first excited state?
Definition
Second orbit.
Term
What happens when an atom absorbs a photon whose energy equals the difference between lower and higher energy levels?
Definition
The electron moves to the outer (higher energy) orbit.
Term
What happens when an atom in a higher energy level returns to a lower energy level?
Definition
It emits a photon whose energy equals the difference between the two levels.
Term
Why is an atomic spectrum not continuous?
Definition
Because an atom's energy is not continuous. It has only certain states.
Term
T or F. Electrons move in fixed, defined orbits.
Definition
False.
Term
What are alternate forms of the same entity?
Definition
Matter and energy.
Term
What did de Broglie find?
Definition
Matter behaves as though it moves in a wave.
Term
What is the wave-particle duality?
Definition
Energy AND matter are particulate, massive, and wavelike.
Term
What states that it is impossible to know simultaneously the position and momentum for a particle?
Definition
Uncertainty principle.
Term
What examines the wave nature of objects on the atomic scale?
Definition
Quantum mechanics.
Term
What model describes an atom with specific quantities of energy that result from allowed frequencies of its electron's wavelike motion?
Definition
Quantum-mechanical model.
Term
What are the two central aspects of the quantum-mechanical model?
Definition
Atomic orbital and the electron's probable location.
Term
What is another name for "wave function?" What is it's greek symbol?
Definition
Atomic orbital. ψ
Term
What does a wave function describe?
Definition

It is a description of the electron's matter-wave in three dimensions.

 

Term
What is a measure of the probablility of finding the electron in some tiny volume of the atom?
Definition
Probability density. ψ2
Term
In an electron density diagram, the electron probablity density ________ with distance from the nucleus.
Definition
Decreases.
Term
What is an imaginary picture of the electron changing its position rapidly ofver time?
Definition
Electron cloud.
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