1) The masses of nuclei in a sample of uranium are determined using a mass spect
ID: 2112006 • Letter: 1
Question
1)The masses of nuclei in a sample of uranium are determined using a mass spectrometer. Measurements suggest that some nuclei in the sample have higher the mass of others. Which of the following is the most likely explanation for this observation?
A. Uranium nuclei are decaying radioactively.
B. Several uranium isotopes are present.
C. The uranium ions have different speeds.
D. The uranium ions have different charges.
2) The Bohr model of the hydrogen atom is able to
A. predict accurate values for some of the wavelengths in the spectrum of atomic hydrogen.
B. account for the detailed structure of the spectral lines in the spectrum of atomic hydrogen.
C. explain the relative intensity of the different spectral lines in the spectrum of atomic hydrogen.
D. be extended to predict accurately, some of the wavelengths in the spectrum of oxygen.
3) the main problem with a solar system model of the atom is that
A) electrons move in circular, not elliptical orbits.
B) the electrons should lose energy since they are accelerating.
C) opposite charges should attract one another.
D) the mass ratio of the nucleus to the electrons is wrong.
4)When an electron in a hydrogen atom jumps from an orbit farther from the nucleus to an orbit closer to the nucleus, it
A) emits a single photon with an energy equal to the energy difference of the two orbits.
B) emits four photons, one for each of the color lines observed in the line spectrum of hydrogen.
C) emits a number of photons dependent on the number of orbit levels jumped over.
D) None of the above are correct.
5) the Bohr model of the atom
A) explained the color lines in the hydrogen spectrum.
B) could not explain the line spectrum of atoms larger than hydrogen.
C) had some made-up rules without explanations.
D) All of the above are correct.
6) which of the following is a description of Dalton's model?
A) An atom is composed of evenly distributed negative and positive charges.
B) An atom is composed of positive particles concentrated in a nucleus and negative particles moving within different energy levels.
C) An atom is composed of very dense positive particles concentrated in a nucleus and negative charges moving freely around that nucleus.
D) An atom is indivisible and the atoms of the same element are all identical.
7) thompson model is trying to explain:
A) Indivisibility of atoms
B) Electrical neutrality of atoms
C) Heisenberg principle
D) The structure of atomic nucleus
8)Electron orbitals are related to electron's
a) mass
b) spin
c)energy
d)charge
Explanation / Answer
1.d
2.c
3.a
4.b
5.d
6.a
7.b
8.c
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