HW Reviews Flashcards
What is the relationship between 2H and 1H?
isotopes
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.
What is the relationship between 40Ca and 115Cd?
none
These two elements do not share a relationship in terms of isotopes, isobars, or isotones.
What is the relationship between 40Ar, 40K, and 40Ca?
isobars
Isobars are nuclides that have the same mass number but different atomic numbers.
What is the relationship between 56Fe and 57Co?
isotones
Isotones are nuclides that have the same number of neutrons but different numbers of protons.
What is the relationship between 12C and 14C?
isotopes
Both 12C and 14C are carbon isotopes, differing in the number of neutrons.
Can pure Si act as an intrinsic semiconductor?
Yes
What effect does doping with phosphorous have on the band structure of silicon?
Adds valence electron
* Adds another energy level below conduction band (creates donor level)
* Becomes n-type
What effect does doping with boron have on the band structure of silicon?
Boron has less valence electrons
* Adds holes above energy levels of valence band (creates acceptor level)
* Becomes p-type
What is the name of the effect utilized in solar cells to excite valence electrons to the conducting band?
Photovoltaic effect
What coordination geometry do you expect for [Pd(PPh3)4]?
tetrahedral
Which is paramagnetic: square Planar or tetrahedral
tetrahedral because weaker splitting by Ligands being further apart increasing unpaired electrons
What coordination geometry do you expect for [Mn(OH2)6]2+?
octahedral
Is [Mn(OH2)6]2+ a high-spin complex?
yes
Why is Si an intrinsic semiconductor
4 VE for 4 Bonds means no holes
Is square planar usually high or low spin
Low spin
Use Bells rule to explain why pKa values could be similar
pKa is related to energy req to remove a proton
More oxygen means lower pKa
More easily removed H means lower pKa
Element having more O is comparable to element more willing to release H
de Broglie’s wave equation
wavelength = h/mv
K shell =
1
N shell =
4
Hydrogen combustion
H2O: an oxide
Sodium Combustion
Na2O2: peroxide
Magnesium combustion
MgO: oxide
Cesium combistion
CsO2: superoxide
Barium combistion
BaO2: peroxide
which bond is stronger: superoxide or peroxide
superoxide
lower bond order
weaker bond
higher bond order
stronger bond
has unpaired electrons
paramagnetic
no unpaired electrons
diamagnetic
according to pauling electronegativity, these elements break the usual trend
Si and Al are lower than atoms below them
