Search found 52 matches
- Sat Dec 12, 2020 9:41 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: heme complex [ENDORSED]
- Replies: 1
- Views: 387
heme complex [ENDORSED]
is a heme complex square planar or tetrahedral?
- Tue Dec 08, 2020 2:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: shape
- Replies: 1
- Views: 114
shape
Draw the Lewis structure and give the approximate bond angles of (d) N2H4. Why can't there be a triple bond between the N atoms?
- Mon Dec 07, 2020 4:09 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: coord number and oxidation number
- Replies: 3
- Views: 208
coord number and oxidation number
How do we determine the oxidation and coordination number of a compound?
- Mon Dec 07, 2020 4:07 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Dentisisty
- Replies: 1
- Views: 112
Dentisisty
How can we tell the dentisity of a compound without drawing it out?
- Fri Dec 04, 2020 6:37 pm
- Forum: Amphoteric Compounds
- Topic: 6A 17
- Replies: 4
- Views: 240
6A 17
how would you figure out the answers for 6A 17 "6A.17 State whether the following oxides are acidic, basic, or amphoteric: (a) BaO; (b) SO3; (c) As2O3; (d) Bi2O3." what would the explanation be for each?
- Fri Dec 04, 2020 1:10 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: difference
- Replies: 4
- Views: 237
difference
how can we tell the difference between trigonal planar and t-shaped?
- Fri Dec 04, 2020 1:07 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: calculating
- Replies: 2
- Views: 195
calculating
is the H3O concentration always the same when calculating pH or does the problem give us a specific number?
- Thu Dec 03, 2020 2:43 pm
- Forum: *Molecular Orbital Theory Applied To Transition Metals
- Topic: planes
- Replies: 4
- Views: 801
planes
how would you know if atoms in a compound are in the same plane or not?
- Mon Nov 30, 2020 11:40 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: textbook 2.57
- Replies: 1
- Views: 291
textbook 2.57
Hi, I cannot find the answer for question 2.57 (2.57 Acetonitrile, CH3CN, is used as a solvent in the pharmaceu- tical industry. Describe the structure of the CH3CN molecule in terms of hybrid orbitals, bond angles, and s- and p-bonds. The N atom is a terminal atom.) in the textbook. Does anyone kno...
- Mon Nov 30, 2020 9:34 pm
- Forum: Hybridization
- Topic: identification
- Replies: 5
- Views: 317
identification
how do you Identify the hybrid orbitals for BrF3?
- Mon Nov 30, 2020 9:32 pm
- Forum: Hybridization
- Topic: pcl3
- Replies: 8
- Views: 760
pcl3
why is the hybridization of PCl3 sp^3 and not sp^2?
- Mon Nov 23, 2020 10:31 pm
- Forum: Electronegativity
- Topic: determining electronegativity
- Replies: 40
- Views: 5563
Re: determining electronegativity
I just follow the periodic table trend. Electronegativity increases from left right and down up!
- Mon Nov 23, 2020 10:27 pm
- Forum: Hybridization
- Topic: e density
- Replies: 30
- Views: 1030
e density
is every bond and lone pair considered a region of electron density?
- Mon Nov 23, 2020 10:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: memorization
- Replies: 12
- Views: 734
memorization
hi,
Is there an easy way to memorize the shapes and their names? any tips?
Is there an easy way to memorize the shapes and their names? any tips?
- Thu Nov 19, 2020 10:52 pm
- Forum: Sigma & Pi Bonds
- Topic: Triple bond?
- Replies: 21
- Views: 836
Re: Triple bond?
a triple bond has one sigma and 2 pi bonds
- Thu Nov 19, 2020 10:50 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 3d and 4s
- Replies: 9
- Views: 503
Re: 3d and 4s
basically they just wrote 3d^5 instead of 3d^3 4S^2 because the d orbital is more stable when its either half filled or completely filled
- Thu Nov 19, 2020 5:59 pm
- Forum: Trends in The Periodic Table
- Topic: atomic radius of anions
- Replies: 9
- Views: 503
atomic radius of anions
why is the atomic radius of Br- larger than Na?
- Thu Nov 19, 2020 2:56 pm
- Forum: Dipole Moments
- Topic: Pressures and Points
- Replies: 4
- Views: 433
Pressures and Points
How do we identify stronger melting and boiling points? Also what is vapor pressure and how can it be higher? for example, why is the vapor pressure of diethyl ether (C2H5OC2H5) is greater than that of water.
- Thu Nov 19, 2020 2:48 pm
- Forum: Bond Lengths & Energies
- Topic: electron repulsion
- Replies: 15
- Views: 741
electron repulsion
Is there electron repulsion in every atom with a lone pair?
- Fri Nov 13, 2020 11:15 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: is it polar
- Replies: 6
- Views: 484
is it polar
Hi,
how do we assign charges for dipole moments and how can we tell if a molecule is polar or not?
how do we assign charges for dipole moments and how can we tell if a molecule is polar or not?
- Thu Nov 12, 2020 11:42 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: charge of atom
- Replies: 2
- Views: 148
charge of atom
how do we find the charge of an atom? is there a way to tell the charge of an atom from its magnetic spin? do the arrows tell us anything about the atoms charge?
- Wed Nov 11, 2020 9:56 pm
- Forum: Dipole Moments
- Topic: induced dipole vs dipole
- Replies: 11
- Views: 857
induced dipole vs dipole
What is the difference between induced dipole-induced dipole and dipole-dipole and how can we tell the difference?
- Wed Nov 11, 2020 9:54 pm
- Forum: Ionic & Covalent Bonds
- Topic: distinguishing bonds
- Replies: 2
- Views: 126
distinguishing bonds
What is the fastest way to distinguish between ionic and covalent bonds?
- Wed Nov 11, 2020 9:53 pm
- Forum: Bond Lengths & Energies
- Topic: boiling point and IMS
- Replies: 5
- Views: 315
boiling point and IMS
What is the relationship between boiling points and Intermolecular forces?
- Wed Nov 11, 2020 9:51 pm
- Forum: Dipole Moments
- Topic: partial dipole
- Replies: 2
- Views: 58
partial dipole
how do we know if a bond has partial dipole moments?
- Tue Nov 10, 2020 9:30 pm
- Forum: Bond Lengths & Energies
- Topic: electron affinity
- Replies: 2
- Views: 87
electron affinity
why does the electron has a lower energy when it occupies one of the atom’s orbitals?
- Mon Nov 02, 2020 9:59 pm
- Forum: Lewis Structures
- Topic: charge by square bracket
- Replies: 8
- Views: 1650
charge by square bracket
HI,
What are the charges outside of the square brackets that the lewis structure is in? For example, Dr, Lavelle, put a - outside of the lewis structure for NO3 in his lecture today (11/02).
What are the charges outside of the square brackets that the lewis structure is in? For example, Dr, Lavelle, put a - outside of the lewis structure for NO3 in his lecture today (11/02).
- Mon Nov 02, 2020 9:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Scores
- Replies: 28
- Views: 1127
Re: Midterm Scores
Someone mentioned that Dr. Lavelle mentioned in his office hours that grades will be posted on Thursday!
- Mon Nov 02, 2020 9:54 pm
- Forum: Properties of Light
- Topic: Wavelenght
- Replies: 17
- Views: 668
Re: Wavelenght
Gamma rays have the shortest wavelength and the highest frequency. On the other hand, Radio waves have the longest wavelengths=lowest frequency.
- Mon Nov 02, 2020 9:51 pm
- Forum: Lewis Structures
- Topic: sides
- Replies: 12
- Views: 549
sides
Hi,
Let's say for NO3, does it matter what three sides we put O around N when creating the Lewis Structure? or could it be any side?
Let's say for NO3, does it matter what three sides we put O around N when creating the Lewis Structure? or could it be any side?
- Mon Nov 02, 2020 9:49 pm
- Forum: Trends in The Periodic Table
- Topic: # of electrons
- Replies: 23
- Views: 614
# of electrons
Hi,
how do we count the number of electrons each element has?
how do we count the number of electrons each element has?
- Thu Oct 29, 2020 4:24 pm
- Forum: Einstein Equation
- Topic: energy of photon
- Replies: 10
- Views: 475
energy of photon
Can we use E=hv to find the energy of a photon or do we need to use the E= work function + KE to find it?
- Wed Oct 28, 2020 10:54 am
- Forum: SI Units, Unit Conversions
- Topic: picometer conversion
- Replies: 13
- Views: 1767
Re: picometer conversion
always remember that when you want to go from a higher unit to a lower unit you multiply so m to pm is x 10^12, and when you go from lower to higher you divide so pm to m is x 10^-12
- Wed Oct 28, 2020 10:51 am
- Forum: *Shrodinger Equation
- Topic: Sapling week 2/3
- Replies: 12
- Views: 1192
Re: Sapling week 2/3
for the first part, you regimen all the information needed to solve the equation using the uncertainty equation, just use the electron mass and don't forget to convert angstroms to m! for the second one make sure you convert the molar mass of helium from g/mol to kg/atoms using avogadro's then solve...
- Tue Oct 27, 2020 7:31 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E. 23 b
- Replies: 3
- Views: 300
E. 23 b
why don't we divide by Avogadro's to get moles for b in:
E.23 Calculate the amount (in moles) of (a) Cu21 ions in 3.00 g of CuBr2; (b) SO3 molecules in 7.00 3 102 mg of SO3; (c) F2 ions in 25.2 kg of UF6; (d) H2O in 2.00 g of Na2CO3?10H2O.
E.23 Calculate the amount (in moles) of (a) Cu21 ions in 3.00 g of CuBr2; (b) SO3 molecules in 7.00 3 102 mg of SO3; (c) F2 ions in 25.2 kg of UF6; (d) H2O in 2.00 g of Na2CO3?10H2O.
- Tue Oct 27, 2020 7:00 pm
- Forum: Photoelectric Effect
- Topic: vacuum
- Replies: 3
- Views: 123
vacuum
Why does photoelectric effect have to be done under a vacuum?
- Wed Oct 21, 2020 9:43 pm
- Forum: Photoelectric Effect
- Topic: Application
- Replies: 5
- Views: 117
Application
does the photoelectric effect only apply to metal surfaces?
- Wed Oct 21, 2020 9:41 pm
- Forum: Properties of Electrons
- Topic: intensity vs energy
- Replies: 29
- Views: 3181
intensity vs energy
can some explain this true or false question please with the answer:
An increase in intensity means an increase in energy
An increase in intensity means an increase in energy
- Wed Oct 21, 2020 9:38 pm
- Forum: Properties of Light
- Topic: wave vs particle
- Replies: 3
- Views: 84
wave vs particle
what are the differences between properties of waves and particles? any distinct differences that would immediately set them apart?
- Tue Oct 20, 2020 10:42 pm
- Forum: Properties of Electrons
- Topic: 1A.1 part a
- Replies: 4
- Views: 151
1A.1 part a
Can someone explain the answer for part A of 1A.1 for the textbook problem: 1A.1 At the time that J. J. Thomson conducted his experiments on cathode rays, the nature of the electron was in doubt. Some considered it to be a form of radiation, like light; others believed the electron to be a particle....
- Mon Oct 19, 2020 11:44 am
- Forum: Properties of Light
- Topic: calculating photons
- Replies: 4
- Views: 78
calculating photons
how do you calculate the number of photons when given wavelength and energy?
- Mon Oct 12, 2020 10:46 pm
- Forum: Properties of Electrons
- Topic: UV radiation calculation
- Replies: 2
- Views: 61
UV radiation calculation
how do you calculate the energy per photon of ultraviolet radiation?
- Mon Oct 12, 2020 10:17 pm
- Forum: Properties of Light
- Topic: Regions
- Replies: 2
- Views: 54
Regions
In the lecture posted today, Dr. Lavelle mentioned the UV region (29.50). What is that, what other regions are there, and how can we tell the difference?
- Mon Oct 12, 2020 9:42 pm
- Forum: Properties of Light
- Topic: classical mechanic
- Replies: 5
- Views: 222
classical mechanic
does F=MA only apply to classical mechanics?
- Mon Oct 12, 2020 9:35 pm
- Forum: Empirical & Molecular Formulas
- Topic: Finding Empirical Formula
- Replies: 10
- Views: 441
Re: Finding Empirical Formula
since empirical formulas require whole numbers, by multiplying 1.33 by 3, he gets to the closest whole number to use in the formula
- Mon Oct 12, 2020 9:32 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing equations.
- Replies: 35
- Views: 2504
Re: Balancing equations.
What I always do is that I count and balance. from the left. So I look at the first element from the left, make sure its balanced on both sides, then move on to the next elements. And when I'm done with that I just make sure that all my coefficients are whole numbers, then I just do a quick check on...
- Mon Oct 12, 2020 4:43 pm
- Forum: Properties of Light
- Topic: video modules
- Replies: 10
- Views: 278
video modules
Are the "Wave properties of light, classical v quantum mechanics, and photon properties of light" video modules recommended for better understanding of the quantum world?
- Mon Oct 05, 2020 12:28 pm
- Forum: Balancing Chemical Reactions
- Topic: Delta Over Reaction Arrow
- Replies: 2
- Views: 1092
Re: Delta Over Reaction Arrow
hi,
delta over the arrow means that energy in the form of heat is being added to the reaction!
delta over the arrow means that energy in the form of heat is being added to the reaction!
- Mon Oct 05, 2020 12:25 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Question about Mass%
- Replies: 14
- Views: 372
Re: Question about Mass%
hi,
it's easier to use 100g because you can just take the percent out of 100 instead of having to calculate and find the exact. it just makes it easier to calculate basically.
it's easier to use 100g because you can just take the percent out of 100 instead of having to calculate and find the exact. it just makes it easier to calculate basically.
- Mon Oct 05, 2020 12:22 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's #
- Replies: 33
- Views: 3967
Avogadro's #
Hi,
is there a specific way to know when exactly we need to use Avogadro's #? like key words or concepts that always require us to use it?
is there a specific way to know when exactly we need to use Avogadro's #? like key words or concepts that always require us to use it?
- Mon Oct 05, 2020 12:19 pm
- Forum: Balancing Chemical Reactions
- Topic: Stoichiometric Coefficients
- Replies: 20
- Views: 436
Re: Stoichiometric Coefficients
hiii,
I would say always check and make sure it's balanced, even if other questions you've answered have been balanced always check. You don't want to solve a whole problem then have to redo it cause you didn't check and balance it in the beginning
I would say always check and make sure it's balanced, even if other questions you've answered have been balanced always check. You don't want to solve a whole problem then have to redo it cause you didn't check and balance it in the beginning
- Mon Oct 05, 2020 12:17 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: dilution equation
- Replies: 6
- Views: 167
dilution equation
Hi,
if the problem gives us the initial volume in mL and we find the final volume in L, do we convert it to mL for our final answer or does it not matter? do our labels always have to match what the initial problem already gave us?
if the problem gives us the initial volume in mL and we find the final volume in L, do we convert it to mL for our final answer or does it not matter? do our labels always have to match what the initial problem already gave us?