Exam (elaborations)
Cem 141 - Final Review Questions and CORRECT Answers
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Cem 141 - Final Review Questions and CORRECT Answers
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Cem 141 - Final Review8 mol atoms. - ANS-How many atoms are in 2 mol of BCl3?
all black - ANS-Spectra are direct evidence for the existence of quantized energy levels in an
atom. What would an absorption spectrum look like if quantized energy levels in an atom did not
exist?
Cl2 because it has a larger electron cloud and stronger LDFs to overcome when it boils. -
ANS-Consider Argon (Ar) and Chlorine (Cl2). Which do you predict to have the higher boiling
point and why?
Energy from the light is absorbed by the system. - ANS-Some wavelengths of light can break
the attractive force between an electron and the nucleus, thus ionizing an atom. Which
statement is true about this process?
Helium atoms interact with atoms in the surroundings and energy is removed from the system. -
ANS-Helium has a boiling point of 4.5 K. How is energy transferred at the atomic level when
helium condenses (gas to liquid)?
II and III - ANS-An element that conducts electricity is found to have a melting point of 1,985 K.
The element is not carbon. Which of the following statements are true for this element?
I. This element exists as discrete atoms or discrete molecules.
II. This element exists as a continuous network of atoms.
III. When this element melts, metallic bonds are overcome.
IV. When this element melts, covalent bonds are overcome.
V. When this element melts, LDFs are overcome.
In graphite, the valence electrons are delocalized in bonds formed by the side-to-side overlap of
p-orbitals. - ANS-Why does graphite conduct electricity?
Metals are shiny because they absorb and re-emit photons, but in the dark, there are no
photons to absorb. - ANS-What is the best explanation for why copper does not appear shiny in
the dark?
No. This only contains claim and evidence, no reasoning. - ANS-Is this scientific explanation
complete? Why or why not? Balloons float because they contain helium.
The atomic radius of Oxygen is larger, higher ionization energy. - ANS-Why is there a stronger
interaction between oxygen atoms than xenon atoms?
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