Exam (elaborations)
CHEM 219 Exam #2 Questions And 100% Correct Answers
- Course
- Institution
CHEM 219 Exam #2 Questions And 100% Correct Answers...
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Easton. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83100 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now