CHEMISTRY COMMUNITY

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is a heme complex square planar or tetrahedral?

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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?

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How do we determine the oxidation and coordination number of a compound?

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How can we tell the dentisity of a compound without drawing it out?

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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?

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how can we tell the difference between trigonal planar and t-shaped?

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is the H3O concentration always the same when calculating pH or does the problem give us a specific number?

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how would you know if atoms in a compound are in the same plane or not?

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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...

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how do you Identify the hybrid orbitals for BrF3?

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why is the hybridization of PCl3 sp^3 and not sp^2?

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I just follow the periodic table trend. Electronegativity increases from left right and down up!

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is every bond and lone pair considered a region of electron density?

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hi,
Is there an easy way to memorize the shapes and their names? any tips?

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a triple bond has one sigma and 2 pi bonds

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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

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why is the atomic radius of Br- larger than Na?

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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.

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Is there electron repulsion in every atom with a lone pair?

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Hi,
how do we assign charges for dipole moments and how can we tell if a molecule is polar or not?

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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?

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What is the difference between induced dipole-induced dipole and dipole-dipole and how can we tell the difference?

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What is the fastest way to distinguish between ionic and covalent bonds?

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What is the relationship between boiling points and Intermolecular forces?

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how do we know if a bond has partial dipole moments?

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why does the electron has a lower energy when it occupies one of the atom’s orbitals?

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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).

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Someone mentioned that Dr. Lavelle mentioned in his office hours that grades will be posted on Thursday!

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Gamma rays have the shortest wavelength and the highest frequency. On the other hand, Radio waves have the longest wavelengths=lowest frequency.

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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?

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Hi,
how do we count the number of electrons each element has?

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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?

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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

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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...

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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.

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Why does photoelectric effect have to be done under a vacuum?

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does the photoelectric effect only apply to metal surfaces?

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can some explain this true or false question please with the answer:

An increase in intensity means an increase in energy

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what are the differences between properties of waves and particles? any distinct differences that would immediately set them apart?

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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....

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how do you calculate the number of photons when given wavelength and energy?

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how do you calculate the energy per photon of ultraviolet radiation?

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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?

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does F=MA only apply to classical mechanics?

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since empirical formulas require whole numbers, by multiplying 1.33 by 3, he gets to the closest whole number to use in the formula

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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...

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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?

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hi,
delta over the arrow means that energy in the form of heat is being added to the reaction!

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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.

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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?

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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

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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?

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