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WorksheetsEnergy and Light Review
Total questions: 21
Worksheet time: 20mins
The ground state is the ______________ energy state of an atom.
highest
lowest
An emission spectrum is produced when an electron moves from one energy level
into the nucleus
to a higher energy level
to another position in the same sublevel
to a lower energy level
If an electron moves from n=4 to n=2 it ____
absorbs energy
releases energy
Emission spectra emitted by an element (or compound) will produce ___ through a spectroscope.
bright lines
a continuous rainbow
dark lines
white light
What causes the emission of radiant energy that produces characteristic spectral lines?
gamma ray emission from the nucleus
neutron absorption by the nucleus
return of electrons to lower energy levels
movement of electrons to higher energy levels
Which element is not present in the mixture?
Element Z
Element X
Element D
Element A
During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when electrons in excited lithium atoms
are gained by the atoms
are lost by the atoms
move to higher energy states within the atoms
return to lower energy states within the atoms
The light produced by signs using neon gas results from electrons that are
being lost by the Ne(g) atoms
being gained by the Ne(g) atoms
moving from lower to higher principal energy level
moving from higher to lower principal energy level
Four gas spectra are given. What gases are in the unknown mixture?
Gas B & Gas D
Gas C & Gas B
Gas A & Gas D
Gas D & Gas C
What subatomic particle is responsible for the spectral lines seen in emission spectra diagrams?
electrons
protons
neutrons
A scientist has a sample of an unknown gas. In order to identify the gas, they look at the spectrum of visible light emitted from it when it is heated. This is shown in the figure. Also shown in the figure are the emission spectra of five pure, gaseous elements. Which of the five elements is the unknown gas?
helium
neon
xenon
oxygen
argon
Which element(s) is/are in Unknown W?
Cadmium, Potassium, and Helium
Hydrogen, Potassium, and Lithium
Cadmium and Sodium
Only Sodium
If an electron moves from n=4 to n=2 it ____
absorbs energy
releases energy
