chm 141 exam 3 practice

Line spectra from all regions of the electromagnetic spectrum are used by astronomers
to identify elements present in the atmospheres of stars. Calculate the wavelength of
the photon emitted when the hydrogen atom undergoes a transition from n = 4 to n = 3.

• 1876 nm

• 1094 nm

• 656 nm

• 335 nm

• 109 nm

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Which of the following is NOT a true statement regarding quantum theory and atomic
structure?

• Matter and energy are alternate forms of the same entity.
  

• A threshold frequency must be obtained to observe the photoelectric effect.

• It is possible to accurately determine both the speed and position of a particle.
  

• Light can behave both as a wave and a particle.
  

• Excited gaseous atoms produce line spectra at certain allowable frequencies
  instead of as a continuous spectrum.

Tags

NGSS.HS-PS4-3

What is the frequency of the photons emitted by a He-Ne laser with a wavelength of
633.2 nm?

• 4.738 x 10 5 Hz

• 1.897 x 10 5 Hz

• 1.897 x 10 11 Hz

• 4.738 x 10 14 Hz

• 1.897 x 10 14 Hz

Tags

NGSS.HS-PS4-1

What is the orbital designation for an electron with the quantum numbers n 4, 2?

• 4s

• 4p

• 4d

• 4f

• Cannot be determined.

Which of the following is not a possible set of quantum numbers for an electron?

• 
  n= 5, l=4, m l= 2

• n =3, l=0, m l =0

• n =2, l=1, m l =1

• n =1, l=0, m l =1

• n =4, l=3, m l =3

What is the ground-state electron configuration of an Ni2+ ion?

• [Ar] 4s 2 3d 8

• [Ar] 4s 2 3d 6

• [Ar]3d 8

• [Ar] 4s 2 3d10

• [Ar]3d10

Tags

NGSS.HS-PS1-1

The Fe transition metal atom has how many d electrons?

• 0

• 3

• 5

• 6

• 8

Tags

NGSS.HS-PS1-1

Which of the following atoms or ions is paramagnetic?

• He

• Sr

• Na +

• Al

• Be

Tags

NGSS.HS-PS1-1

Which of the following statements regarding fluorine and sulfur is NOT true?

• Fluorine has greater electronegativity.

• Fluorine has more core electrons.

• Fluorine has more valence electrons.

• Fluorine has a greater 1st ionization energy.

• Fluorine has a greater electron affinity.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which compound would you expect to have the highest lattice energy?

• MgO

• CaS

• CsBr

• NaF

• KBr

Tags

NGSS.HS-PS1-3