Search found 32 matches
- Thu Jun 14, 2018 2:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: french toast #15
- Replies: 3
- Views: 320
Re: french toast #15
in the test you can use either bent or angular becuase they are interchangeable
- Thu Jun 14, 2018 2:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-Shape
- Replies: 6
- Views: 361
Re: T-Shape
one has to realize that there are 5 regions of electron density which would usually be 120 and 90 degrees but since two of these are lon pairs it makes the angles smaller because the lone pairs push the bonds away.
- Thu Jun 14, 2018 1:42 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: shells versus orbitals
- Replies: 3
- Views: 401
Re: shells versus orbitals
a shell contains orbitals (subshells)
for example in the second shell there is the s orbital and the p orbital
shell correlated to the period and subshells to the blocks
for example in the second shell there is the s orbital and the p orbital
shell correlated to the period and subshells to the blocks
- Thu Jun 14, 2018 1:38 pm
- Forum: Bronsted Acids & Bases
- Topic: bronstead vs lewis
- Replies: 2
- Views: 248
Re: bronstead vs lewis
not really, lewis acid is pretty much like a bronsted acid but juse deifned in a different way and same goes with lewis base and bronsted base a lewis acid is one that accepts electrons and the base donates an eelctron a bronsted acid donates a proton which technically means there is a more negative...
- Thu Jun 14, 2018 1:34 pm
- Forum: Trends in The Periodic Table
- Topic: 7p orbital on periodic table
- Replies: 1
- Views: 180
Re: 7p orbital on periodic table
it is from Ununtrium to Ununoctium
- Thu Jun 14, 2018 2:19 am
- Forum: Photoelectric Effect
- Topic: test 2 q. 7
- Replies: 1
- Views: 207
test 2 q. 7
the question is : COpper is used widely in electrical wiring due to its high electrical conductivity and malleability. The threshold energy or "work fucntion" of the copper atom is 7.52 *10^{-19} J . What is the maximum wavelength of light (lowest energy) you need to shine onto copper meta...
- Thu Jun 14, 2018 1:23 am
- Forum: Molarity, Solutions, Dilutions
- Topic: midterm q.1c
- Replies: 1
- Views: 205
midterm q.1c
im confused as how to go on about this question Potassium permangante, KMnO_{4} , is an organic chemical compound used for cleaning wounds. 5.00 g of KMnO_{4} is dissolved in a 150.00 mL flask of water. If 20.00 mL of this solution is removed and placed in a new 2nd 250.00 mL flask and filled with w...
- Thu Jun 14, 2018 1:05 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: coordination and oxidation numbers [ENDORSED]
- Replies: 1
- Views: 294
coordination and oxidation numbers [ENDORSED]
what is the difference between these two numbers and how do we find them ?
- Thu Jun 14, 2018 1:03 am
- Forum: Lewis Structures
- Topic: Radical HW 3.59
- Replies: 6
- Views: 436
Re: Radical HW 3.59
YeseniaGomez_1L wrote:I don't really understand how you all are finding radicals. For example question 3.55 asks us to identify which of the following are radicals: NO2-, CH3, OH, CH2O.
How do you know which are radicals?
radicals are those that have odd number of valence electrons
- Thu Jun 14, 2018 12:58 am
- Forum: Lewis Structures
- Topic: Central atom and octet rule?
- Replies: 12
- Views: 1362
Re: Central atom and octet rule?
Amanda 1A wrote:is there a rule to know when some atoms are okay with having less than 8 electrons? or should we just memorize some of them and hope for the best?
i think it is just memorization but its basically just group 13 and H, He, Li, Be
- Thu Jun 14, 2018 12:56 am
- Forum: Lewis Structures
- Topic: Breaking the Octet Rule
- Replies: 3
- Views: 202
Re: Breaking the Octet Rule
victoriatanaka1C wrote:And just to clarify, the elements that can break the octet rule are H, He, Li, Be, Column 13 and Row 3 and below?
yes, group 13 can have less than 8 valence elctrons and period 3 and under can have more than 8 valence electrons
- Wed Jun 13, 2018 2:18 am
- Forum: Molarity, Solutions, Dilutions
- Topic: test 1 Q.1 Help?
- Replies: 1
- Views: 181
test 1 Q.1 Help?
lithium carbonate,
, is a salt which is used for the treatment of bipolar disorder. A solution of lithium carbonate is prepared by dissolving 2.00 g of salt to 1.00 L water.
A. what is the concentration of lithium ions for the above solution?
A. what is the concentration of lithium ions for the above solution?
- Wed Jun 13, 2018 1:52 am
- Forum: Molarity, Solutions, Dilutions
- Topic: test 1 Q. 2
- Replies: 1
- Views: 182
test 1 Q. 2
kinda a old question but i was still confused on how to solve this question and also are there any other similar question like these in the book ? One industrial application of anelectrolyte solution is electroplating of metals. In this process, an aqueous solution of metal ions is prepared and elec...
- Wed Jun 13, 2018 1:14 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: sigma and pi bond
- Replies: 2
- Views: 241
Re: sigma and pi bond
not sure if you were confused on this too but when given a lewis structure, a single bond is a sigma bond while double and triple bonds are pi bonds :)
- Wed Jun 13, 2018 1:11 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Helpful Chart
- Replies: 18
- Views: 917
Re: Helpful Chart
when one of those regions is lone pair or pairs, is it basically the same thing but just with > or < ?
- Wed Jun 13, 2018 1:10 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Helpful Chart
- Replies: 18
- Views: 917
Re: Helpful Chart
when one of those regions is lone pair or pairs, is it basically the same thing but just with > or < ?
- Wed Jun 13, 2018 1:03 am
- Forum: Bond Lengths & Energies
- Topic: Bond Angles
- Replies: 3
- Views: 370
Re: Bond Angles
i was told that when there is one lone pair, the angles between the lone pair and the atom would be >109.5 and the angles between two atoms would be <109.5 .
- Wed Jun 13, 2018 12:58 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Homework 4.13
- Replies: 2
- Views: 265
Re: Homework 4.13
the only way that it would be bent if the central atom had two lone pairs. with three long pairs you can kinda picture it like a trigonal bipyramidal, the three lone pairs are 120 degrees from one another leaving the two other atoms being directly across from each other (180 degrees)
- Wed Jun 13, 2018 12:53 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Van Der Waal forces
- Replies: 3
- Views: 652
Van Der Waal forces
could anyone explain to me what the differences are between diople-dipole forces, london forces, ion-dipole, and hydrogen bonding?! How could we identify them when given molecular substances? Like in question 6.1
- Tue Jun 12, 2018 7:40 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: series
- Replies: 1
- Views: 198
series
for the final are we expected to just knowthe balmer and lyman series or also the paschen, brackett, and pfund series??
- Tue Jun 12, 2018 6:09 pm
- Forum: Balancing Chemical Reactions
- Topic: oxidation and reduction
- Replies: 1
- Views: 172
oxidation and reduction
Im not sure if i remember there being a mention of oxidation and reduction, would it be something mentioned on the final
- Sat Jun 09, 2018 8:22 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: electron configuration of Palladium
- Replies: 2
- Views: 630
electron configuration of Palladium
i would usually expect it to be [Kr] 5s^{2}4d^{8} but I looked this up online and it said that it is [Kr] 4d^{10} beacause it is most stable. I remember professor Lavelle mentioning something similiar but when it would be d^{4} or d^{^{9}} but is d^{8} another exception or is the exception just pall...
- Wed Jun 06, 2018 2:15 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: question 17.35 and 17.36
- Replies: 1
- Views: 146
question 17.35 and 17.36
17.35 asks to determine if the isomers of diaminobenzene can form chelating complexes and similarly 17.36 asks to ligands do you expect to form chelating complexes, how is one supposed to determine that from just looking at the pictures ??
- Wed Jun 06, 2018 2:11 am
- Forum: Hybridization
- Topic: Hybridization
- Replies: 3
- Views: 221
Hybridization
I am not sure if i heard right but when figuring out how many hybridization orbitals one has to use, is it the same as the number of regions of electron desnities??
- Wed Jun 06, 2018 2:05 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Ax?e?
- Replies: 1
- Views: 198
Re: Ax?e?
A represents the central atoms, X represents the numebr of atoms bonded to the central atom, and E is the number of long pairs. For example, CF_{4} has a VSEPR formula of AX_{4} , there is the 4 as subscript on the X becuase there are 4 Fs bonded to C. Another example (with lone pairs) could be XeF_...
- Thu May 31, 2018 5:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HW Question 4.25
- Replies: 1
- Views: 115
HW Question 4.25
part A asks to find whether
is polar or nonpolar, do we find out based on the Lewis Structure or the actually shape of the molecule.
- Tue May 22, 2018 1:54 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Dispersion/Induced Dipole-Induced Dipole/London/Van Der Waals
- Replies: 1
- Views: 298
Dispersion/Induced Dipole-Induced Dipole/London/Van Der Waals
could anyone please explain what this is exactly and like how do we use it
- Tue May 08, 2018 2:17 am
- Forum: Trends in The Periodic Table
- Topic: Difference between Periodic trends [ENDORSED]
- Replies: 4
- Views: 426
Re: Difference between Periodic trends [ENDORSED]
Electron affinity is a measure of energy change when an electron is added while electronegativity is how attracted an atom is to electrons. While electron affinity is increasing, electronegativity is decreasing since as an atom is less attractive to electrons, it requires more energy to add an elec...
- Tue May 08, 2018 2:06 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Test 2 Q.4
- Replies: 3
- Views: 362
Test 2 Q.4
Q: A cotton ball soaked in CaCl_{2} is lit on fire. The flame is a dark orange color (\lambda =630.nm) . A scientist claims that the color arises from the transition of an electron from its excited state to its ground state. What is the difference in energy between these two states? Help?? I...
- Mon May 07, 2018 7:15 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Unicorn Practice Midterm #8
- Replies: 3
- Views: 425
Unicorn Practice Midterm #8
A bullet of mass 2.8 g travels at 373.23 ± .34 m/s. What is the indeterminacy of position?
could anyone help on where to start on this
could anyone help on where to start on this
- Tue Apr 24, 2018 1:18 am
- Forum: Properties of Electrons
- Topic: Homework 1.15
- Replies: 1
- Views: 263
Homework 1.15
15. In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.
How would one know like where to start and which equation to use??
How would one know like where to start and which equation to use??
- Mon Apr 16, 2018 11:09 am
- Forum: Properties of Light
- Topic: wavelength [ENDORSED]
- Replies: 3
- Views: 196
wavelength [ENDORSED]
when asked to find the wavelength of a a light we one divide c
by the frequency given right?