100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
DAT General Chemistry Exam Questions Correctly Answered. $13.99   Add to cart

Exam (elaborations)

DAT General Chemistry Exam Questions Correctly Answered.

 8 views  0 purchase
  • Course
  • DAT.
  • Institution
  • DAT.

DAT General Chemistry Exam Questions Correctly Answered. Atomic Number - CORRECT ANSWER number of protons found in that atom; low number; (Z) Mass Number - CORRECT ANSWER Protons + Neutrons; high number; (A) Atomic Mass - CORRECT ANSWER relative mass of that atom compared to the mass of ...

[Show more]

Preview 3 out of 16  pages

  • August 15, 2024
  • 16
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • dat
  • DAT.
  • DAT.
avatar-seller
ROSEGRADES
DAT General Chemistry Exam Questions
Correctly Answered.

Atomic Number - CORRECT ANSWER number of protons found in that atom; low number; (Z)



Mass Number - CORRECT ANSWER Protons + Neutrons; high number; (A)



Atomic Mass - CORRECT ANSWER relative mass of that atom compared to the mass of a carbon-12 atom
(which is set at 12.00); measured in amu;



1 amu = - CORRECT ANSWER 1.66x10^-24



Atomic Weight - CORRECT ANSWER weight (g) of one mole (mol) of a given element (g/mol); the
weighted average of all the masses (not the weights) of an element, weighted according to the natural
abundance of the isotopic species of an element



1mol = ______ (Avagadro's Number) - CORRECT ANSWER 6.022x10^23 molecules



Isotope - CORRECT ANSWER multiple species of an atom with same number of protons and a different
number of neutrons (different mass numbers); generally exhibit same chemical properties



Ernest Rutherford - CORRECT ANSWER 1911; gave experimental evidence that an atom has a dense,
positively charged nucleus that accounts for a small portion of the volume of the atom



Max Planck - CORRECT ANSWER developed first quantum theory; 1900; proposed that energy emitted as
electromagnetic radiation from matter comes in discrete bundles called quanta; E=hv (h-Planck's
constant)



Planck's constant - CORRECT ANSWER 6.626x10^-34 J*s

,The Bohr Model of the Atom - CORRECT ANSWER developed 1913 model of H atom using Rutherford
and Planck's findings; H atom has central proton, electron travels around it in a circular orbit; centripetal
force acting on the electron as it revolved around the nucleus was the electrical force between the
positively charged proton and negatively charged electron; quantized angular momentum so it changed
in discrete amounts in relation to the quantum number (L=nh/2pi) n=quantum number h=Planck's
constant; from this Energy of an electron: E=-Rh/n^2, Rh=Rydberg constant 2.18*10^-18 J/electron



Rydberg Constant - CORRECT ANSWER 2.18 x 10^-18 J/electron



Smaller orbit of electron the... - CORRECT ANSWER lower the energy state



What is the Bohr Model used for? - CORRECT ANSWER used to explain the atomic emission spectrum
and atomic absorption spectrum of hydrogen; because these spectrum are not the continuous spectrum
that classical physics would expect, they are line spectrum



Balmer Series - CORRECT ANSWER 4 spectral lines that appear in the visible light region when a
hydrogen atom undergoes a transition from energy levels n>2 to n=2.



Lyman Series - CORRECT ANSWER Set of spectral lines appearing in the UV region when a hydrogen
atom undergoes a transition from energy levels n>1 to n=1.



Heisenberg Uncertainty Principle - CORRECT ANSWER impossible to determine the momentum and
position of an electron simultaneously; means if the momentum of an electron is being measured
accurately, its position will change and vice-versa



Pauli exclusion principle - CORRECT ANSWER no 2 electrons in any given atom can possess the same set
of four quantum numbers (n, l, ml, ms)



Energy state of an electron - CORRECT ANSWER the position and energy of an electron described by its 4
quantum numbers (n, l, ml, ms)



quantum number n - CORRECT ANSWER "principal quantum number"; gives info about the size of the
orbital; bigger n is, the bigger the radius of the orbital, the bigger the energy of the orbital; Max number
of electrons in an energy level = 2n^2

, quantum number l - CORRECT ANSWER "Azimuthal (angular momentum) quantum number"; gives info
about the shape of the orbital; value of l = 0 to n-1 ; l=0=s; l =1=p; l=2=d; l=3=f; Max number of electrons
that can exist in a subshell= 4l +2; greater the value of l, the higher the energy of the subshell, but
subshell energies from different principal energy levels may overlap



quantum number ml - CORRECT ANSWER "Magnetic Quantum number"; gives info about the orientation
of an orbital; value of ml = l to -l (includes 0);



quantum number ms - CORRECT ANSWER "Spin Quantum number"; there are two spin orientations:
+1/2 and -1/2; whenever electrons are in the same orbital they must have opposite spins



List the Order the Energy Levels Fill - CORRECT ANSWER Rule: n+l, and if that is the same number, then
the one with the lower n will fill first; 1s, 2s, 2p, 3s,3p,4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f...etc



Hund's rule - CORRECT ANSWER dictates which orbitals within a subshell fill first; within a given subshell,
orbitals are filled so that there is a maximum number of half-filled orbitals with parallel spins



Paramagnetic - CORRECT ANSWER material has unpaired electrons, magnetic field aligns the spins of
these electrons and weakly attracts the atom



Diamagnetic - CORRECT ANSWER materials have no unpaired electrons and are slightly repelled by a
magnetic field



Which are the valence electrons for groups IA and IIA? - CORRECT ANSWER the outermost s electrons



Which are the valence electrons for groups IIIA through VIIIA (remaining column on right, excluding
weird middle metals)? - CORRECT ANSWER the outermost s and p electrons



Which are the valence electrons for the transition elements? - CORRECT ANSWER the outermost s
electrons and the second to outermost d shell

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 ROSEGRADES. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $13.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

79271 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$13.99
  • (0)
  Add to cart