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Cem 141 - Final Review Questions & 100% Verified Correct Answers with complete solutions (Latest update

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Cem 141 - Final Review Questions & 100% Verified Correct Answers with complete solutions (Latest update

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  • August 15, 2024
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  • 2024/2025
  • Exam (elaborations)
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  • cem 141 final review

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  • Chemistry 141
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Cem 141 - Final Review
X because the valence electrons are farther from the nucleus but experience the same effective
nuclear charge. - ANS-Two imaginary elements, X and Y, are in the same column on the
periodic table. X has a higher atomic number. Which has the lower ionization energy and why?

Z+ because it has fewer electrons than Z so the electron-electron repulsions don't push the
electron cloud out as far. - ANS-Consider the imaginary element Z. Do you expect Z or Z+ to
have a smaller radius and why?

The Bohr model defines both the energy of the electron and its distance from the nucleus. -
ANS-Why is the Bohr model of the atom considered to be incorrect?

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?

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?

Two single bonds and two lone pair of electrons. - ANS-Imagine a generic molecule AB2 where
A has 6 valence electrons and B has 7 valence electrons. Element A has a valence of 2 and
element B has a valence of 1. How many bonds and lone pair electrons are on the central atom,
A?

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?

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.

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