CHEMISTRY COMMUNITY

Sophia Fox 4B

When given an equation (for ex: HNO2 + HPO4 ^2- <=> NO2^- + H2PO4^-), how can you tell which one is going to be the bronsted acid and which one will be the bronsted base? Especially if you weren’t given the products? I know that a bronsted acid is the proton donor and a bronsted base is a proton acc...

Sophia Fox 4B

Sophia Fox 4B

Will you be posting a similar review sheet for the final?

Sophia Fox 4B

Polarizability is how easily the electron cloud of an atom (usually a large anion) is distorted by another atom (usually a small highly charged cation). The atom causing the distortion (the cation) has polarizing power, which increases as the atom becomes smaller and more highly charged. The atom th...

Sophia Fox 4B

Can pi bonds be hybridized? Since they're in a different plane than the sigma bonds I'm not sure. Also, are all sigma bonds hybridized?

Sophia Fox 4B

They’re inverses! As one inc, the other dec, and vice versa.

Sophia Fox 4B

Sophia Fox 4B

Signs bonds are single bonds, they’re stronger, formed end to end, able to rotate. Pi bonds are the other bond(s) of the multiple bond, weaker, more easily breakable, formed side to side, not able to rotate.

Sophia Fox 4B

Yes draw all resonance structures and then double sided arrows between them indicating that there is resonance.

Sophia Fox 4B

Not quite sure what the molecules were but generally you find the formal charge of EACH element in the molecule (use the eq that the person said above) and then add them up to find the charge of the molecule. Each element should have the lowest formal charge possible (you can change it by moving the...

Sophia Fox 4B

7th edition 2A.11: Which M^3+ ions (where M is a metal) are predicted to have the following ground state electron configurations: (a) [Ar]3d^6, (b) [Ar]3d^5. I thought the answer to a was Cu^3+, and that the answer for b was Ni^3+, but the answer key says that a is Co^3+ and b is Fe^3+. I really can...

Sophia Fox 4B

What does a non-zero formal charge mean, besides that the molecule isn't in its most stable state? Do the numbers actually mean anything?

Sophia Fox 4B

E = hv is energy for one photon. You need to be given total energy of light source in order to find number of photons. Divide the total energy of light by the energy per photon to find number of photons. Remember number of photons determines intensity of light, not energy per photon.

Sophia Fox 4B

Hi! Can you post the 4th worksheet key? And also do you have a worksheet with more Lewis Structures practice?

Sophia Fox 4B

How would you figure this out? "Place the following ions in order of increasing ionic radius: S^2-, Cl^-, P^3-." Its 7th edition 1F.3. Thanks!

Sophia Fox 4B

correct. the energy of the photon must be greater than or equal to the work function of the specific metal (the minimum amount of energy needed to eject an e-) in order to eject an e-. if the energy of the photon is less than the work function of the metal, no e- will be ejected. if the energy of th...

Sophia Fox 4B

I think you're asking two question here. The energy changes when the electron goes from 1s to 2p because the principle quantum number, which corresponds to size and energy, is changing from n = 1 to n = 2. For hydrogen, the orbitals in a certain energy level (ie: n = 1 or n = 2 or n = 3, etc) are de...

Sophia Fox 4B

use diameter for calculating uncertainty in position (delta x) because the diameter encompasses the whole area that the electron could be located. yes, your calculation for the uncertainty in position in that problem is correct. in that case you're finding a more specific area than just the diameter.

Sophia Fox 4B

How does the Bohr frequency condition explain the lines in the spectrum of an element? Thanks

Sophia Fox 4B

One specific example regarding how light can be wave and particle is the intensity. In the wave model, the intensity is the amplitude squared, but in the particle model the intensity is the number of photons. Hope this helps.

Sophia Fox 4B

Since energy is directly proportional to frequency, its inversely related to wavelength (c = wavelength x freq and E = planks constant (h) x freq ==> derive (E = hc/wavelength) by plugging in for freq). There is a greater change in energy from n =5 to n = 1 than n = 4 to n = 2, so the transition fro...

Sophia Fox 4B

Whats the difference between atomic spectroscopy and molecular spectroscopy? On Dr. Lavelle's syllabus it says "understand the difference bt electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molecular orbitals (molecular spectroscopy)." What does...

Sophia Fox 4B

There's a typo in the third equation. The reactant should be the same as the product of the second reaction: Fe3Br8. Hope this helps!

Sophia Fox 4B

The factor that you get after dividing the molecular mass by the empirical mass should be an integer, or really close (I think if you can round from the hundredths place to an integer it's close enough). If you don't get an integer than re-check the empirical formula or empirical mass. It's really e...

Sophia Fox 4B

Hi! I just posted this same answer on another post but here goes: So first you have to isolate for Mf. Then you do (.2M * 1.0L)/(1+3L) to find the final molarity of the NH4NO3 solution, which is .05M. Once you have that, multiply by .1L (=100mL) to find how many moles of NH4NO3 for each plant, which...

Sophia Fox 4B

So first you have to isolate for Mf. Then you do (.2M * 1.0L)/(1+3L) to find the final molarity of the NH4NO3 solution, which is .05M. Once you have that, multiply by .1L (=100mL) to find how many moles of NH4NO3 for each plant, which is .005 mol NH4NO3. Then use mole ratios to find the moles of jus...

Sophia Fox 4B

Will combustion analysis be on the test? We haven't talked about it but it was in the limiting reactant section in the textbook (Fundamentals Section M3).

Sophia Fox 4B

Since we're starting on Quantum World lectures on Friday the homework for Week 2 will be from that section. My TA said just to turn in the problems that you know how to do if you haven't gone over everything in lecture yet. Hope this helps!

Sophia Fox 4B

It just makes it simpler to look at. The negative exponent and division sign mean the same thing but all of the /'s get confusing, so I prefer using the negative exponent method. It also helps with dimensional analysis bc the units are clearer.

CHEMISTRY COMMUNITY

Search found 29 matches

Distinguishing bronsted acids vs bases

Re: Donating H protons

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

Re: Polarizability

Pi bonds and hybridization

Re: Electronegativity and Polarity

Re: Molecular Shape

Re: sigma and pi bonds

Re: Drawing resonance

Re: 3.53 6th edition

7th edition 2A.11

Re: Formal charge purpose

Re: Calculating number of photons emitted

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

7th edition 1F.3

Re: Conditions that allow electron to be ejected from metal surface

Re: Electron Energy

Re: Calculating Uncertainty in Momentum

Bohr condition explaining lines

Re: Wave/particles

Re: Atomic Spectra

Atomic Spectroscopy vs Molecular Spectroscopy

Re: 7th edition L.35

Re: Going from empirical to Molecular formula

Re: Question G13 (Sixth Edition)

Re: Homework Problem in Section G

Combustion Analysis? [ENDORSED]

Re: Week 2 homework

Re: Unit Notation