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CHEM 219 Exam #2 Questions And 100% Correct Answers
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CHEM 219 Exam #2 Questions And 100%Correct Answers
The atomic radii of zirconium and of hafnium are almost identical although hafnium has
32 more protons and electrons. Which of the following best explains this? - Answer
Hafnium has electrons in the 4f orbitals. These 4f electrons do not effectively shield the
higher nuclear charge and thus Zeff is higher than might be otherwise expected.
Which of the following is true about successive ionization of an atom and its ions?
Answer Each successive ionization requires increasing amounts of energy.
The energy of a photon is its Planck's constant multiplied by the speed of light and then
divided by the wavelength. E = hc/. If microwaves are changed to x-rays, what effect
does this have on the energy of the photon - Answer The energy of the photon increases
Photons are shone on to a piece of metal and one electron is ejected for each absorbed
photon. What happens when the wavelength of light is decreased? - Answer The ejected
electrons would possess higher kinetic energy
What type of light, on the electromagnetic spectrum has the highest energy per photon?
X-ray
visible light
microwaves
Gamma waves - Answer Gamma waves
Energy of a photon is ______ proportional to frequency, and _______ proportional to
wavelength - Directly, inversely
, When a noble gas is heated and the emitted light shone through a prism, what would be
observed? - Individual lines of varying colors
Warming a noble gas elevates its electrons into excited energy states. These then relax
to emit discrete wavelengths of light. Shined through a prism, this leads to individual
lines of different colors.
Bohr Model Answer model of the atom in which electrons move rapidly around the
nucleus in paths called orbits
Electromagnetic Energy Answer a form of energy that travels through space in the form
of waves
Quantum Theory - Answer mathematical description of wave properties of electrons and
other very small particles
Periodic Properties - Answer properties whose value can be predicted based on the
position of the element on the periodic table
What periodic trend describes the energy that is associated with the removal of an
electron from a neutral, gaseous atom? Solution Ionization energy is the energy
required to remove an electron from a neutral gaseous atom.
atomic radius trend - Answer The atomic radius increases as you move down the
periodic table and to the left. Tantalum is the furthest to the right of this list and nearer
the top and it would be expected to have the smallest atomic radius
ionization energies - Answer amount of energy a gaseous atom or ion must absorb to
lose its outermost electron.
Generally speaking, first ionization energy decreases down a group and increases
across a period
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