DAT General Chemistry Exam Questions Correctly Answered.
10 keer bekeken 0 keer verkocht
Vak
DAT.
Instelling
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 ...
dat general chemistry exam questions correctly ans
Geschreven voor
DAT.
DAT.
Verkoper
Volgen
ROSEGRADES
Ontvangen beoordelingen
Voorbeeld van de inhoud
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
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)
,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
Voordelen van het kopen van samenvattingen bij Stuvia op een rij:
Verzekerd van kwaliteit door reviews
Stuvia-klanten hebben meer dan 700.000 samenvattingen beoordeeld. Zo weet je zeker dat je de beste documenten koopt!
Snel en makkelijk kopen
Je betaalt supersnel en eenmalig met iDeal, creditcard of Stuvia-tegoed voor de samenvatting. Zonder lidmaatschap.
Focus op de essentie
Samenvattingen worden geschreven voor en door anderen. Daarom zijn de samenvattingen altijd betrouwbaar en actueel. Zo kom je snel tot de kern!
Veelgestelde vragen
Wat krijg ik als ik dit document koop?
Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.
Tevredenheidsgarantie: hoe werkt dat?
Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.
Van wie koop ik deze samenvatting?
Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper ROSEGRADES. Stuvia faciliteert de betaling aan de verkoper.
Zit ik meteen vast aan een abonnement?
Nee, je koopt alleen deze samenvatting voor €13,83. Je zit daarna nergens aan vast.