Chemistry Review- 2

The product of the frequency and the wavelength of a wave equals the

• number of waves passing a point in a second.

• speed of the wave.

• distance between wave crests.

• Amplitude of the wave

In SI, the frequency of electromagnetic radiation is measured in

• nanometers.

• quantum

• joules

• hertz

The distance between two successive peaks on a wave is its

• frequency

• quantum number

• wavelength

• velocity

A quantum of electromagnetic energy is called a(n)

• Photon

• Electron

• excited atom

• orbital

The energy of a photon, or quantum, is related to its

• Mass

• Speed

• Frequency

• Size

Whenever an excited hydrogen atom returns from an excited state to its ground state, it

• Absorbs a photon of radiation

• Emits a photon of radiation

• Emits radiation over a range of frequencies

• Absorbs specific frequencies of light

For an electron in an atom to change from the ground state to an excited state,

• energy must be released.

• energy must be absorbed.

• radiation must be emitted.

• the electron must make a transition from a higher to a lower energy level.

If electrons in an atom have the lowest possible energies, the atom is in the

• Ground State

• Excited State

• Inert State

• radiatio-emitting state

Bohr's model of the atom works best in explaining

• the spectra of the first ten elements.

• only the spectrum of hydrogen

• only the spectra of atoms with electrons in an s orbital.

• the entire visible spectra of atoms.

The French scientist Louis de Broglie believed

• electrons could have a dual wave-particle nature.

• light waves did not have a dual wave-particle nature.

• the natures of light and quantized electron orbits were not similar.

• Bohr's model of the hydrogen atom was completely correct.