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CHEM 219 Exam -2 Exam Questions with Answers.
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CHEM 219 Exam -2 Exam Questions with Answers.
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CHEM 219 Exam #2 ExamQuestions with Answers
Denning [Date] [Course title]
, The atomic radii of zirconium (Zr) and hafnium (Hf) are nearly the same despite the fact that hafnium
has 32 more protons and electrons. Which of the following bests explains this phenomenon? - Correct
Answers: Hafnium contains 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 concerning successive ionizations of an atom and its ions? - Correct
Answers: Each successive ionization requires increasing amounts of energy
The energy of a photon equals its Planck's constant (h) multiplied by the speed of light(c) and then
divided by the wavelength. E = hc/λ. If microwaves are changed to x-rays, what effect does this have on
the energy of the photon - Correct Answers: The energy of the photon increases
Photons are shone on a piece of metal and one electron is ejected for each absorbed photon. What
happens when the wavelength of light is decreased? - Correct Answers: The ejected electrons would
have greater kinetic energy
What type of light on the electromagnetic spectrum has the highest energy per photon?
X-ray
visible light
microwaves
Gamma waves - Correct Answers: Gamma waves
Energy of a photon is ______ proportional to frequency, and _______ proportional to wavelength -
Correct Answers: directly, inversely
What is observed when a noble gas is heated and the emitted light shone through a prism? - Correct
Answers: individual lines of varying colors
Heating a noble gas promotes its electrons to excited energy states, which then relax to emit discrete
wavelengths of light. When shone through a prism, this results in individual lines of varying colors.
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