CHEMISTRY COMMUNITY

Alysia Garcia 1B

How do we know if a ligand can bind more than once?

Alysia Garcia 1B

For part d of the problem, KBr has a neutral pH but why would that be. I know it dissociates into K+ and Br- and forms HBr and OH-, so how would this be neutral? In part C, the salt was KF and formed HF and OH- yet would increase the pH. What causes this difference?

Alysia Garcia 1B

It was explained that H2se has a higher boiling point than H2S because its bond is stronger but I though the farther away elements, the weaker the bond is. Could someone please explain?

Alysia Garcia 1B

How do we know when carbon should form a ring instead of a chain?

Alysia Garcia 1B

How would we know Zn is a cation? is that just memorization?

Alysia Garcia 1B

For part b of J.7, we are supposed to find the neutralization reaction for zinc nitrite. How would you determine that Zn goes with OH-?

Alysia Garcia 1B

For part b for J.5, we are given (CH3)3N + HNO3-->, why do these compounds combine to form (CH3)3NHNO3, how are we supposed to know to break it up on the right side or combine them? Also, for the ionic equation, why doesn't (CH3)3N break up? Is it because it is a weak acid and how would we know that...

Alysia Garcia 1B

For this problem I'm having a hard time understanding why NH3 would be a base and H2SO3 would be an acid? Could someone help explain?

Alysia Garcia 1B

Why would CO3^2- be a mono dentate? Why can the oxygen with the double bound not serve as a binding site?

Alysia Garcia 1B

For this problem, we are supposed to find the oxidation number for coordination compound. The solution for part a shows that each ligand has a negative 1 charge but how would you find that? I tried to draw it out and I drew C bonded to N with a triple bond, with C also bonded to Fe and N with a lone...

Alysia Garcia 1B

I know that an atom with a lone pair would cause more repulsion and therefore a smaller bond angle than normal but how does it cause this repulsion?

Alysia Garcia 1B

Would a sigma bond be stronger than a pi bond and why?

Alysia Garcia 1B

What exactly is meant by "TM complex/organometallic complex/coordination compound"?

Alysia Garcia 1B

For this molecule, why would the F atoms not be spread evenly around the S atom?

Alysia Garcia 1B

Would a molecule be polar if the dipole moments don’t cancel each other out? like why is water polar if there’s both a negative charge (on the oxygen) and positive charge (on the hydrogen atoms)?

Alysia Garcia 1B

for there to be a 120 degree rather than a straight line the line pair must be on the middle electron? also how does this make the molecule angled?

Alysia Garcia 1B

For lewis structures that show one atom +1 and one -1, why is that not low in energy when they cancel each other out and equal 0?

Alysia Garcia 1B

For part d, it asks for the lewis structure of TeCl4. The solution shows Te, with a Cl on the sides and 2 more Cl below but none on top. Why is it set up this way and when do we have to know to do it this way?

Alysia Garcia 1B

In the solutions, the lewis structure has a double bond connected from the N to one of the Os, but why would we have to use a double bond? It would still follow the octet rule without the double bond. When would have to know to use a double bond then to fill all the sides with electrons?

Alysia Garcia 1B

Why do we chose an atom with the lowest ionization energy as the central atom?

Alysia Garcia 1B

If you search Sunday worksheet, all the worksheets should come up :)

Alysia Garcia 1B

For this question, I am just multiplying the speed of light by 1/100 by the mass of the electron (9.109x10^-31 kg) to find the uncertainty in momentum. This gave me 3x10^6 and then divided h/4pi by the number I found but I somehow am not getting any of the given answers. Does anyone know what error ...

Alysia Garcia 1B

For this problem, why would would b and d be impossible? I thought the ml values were in range.

Alysia Garcia 1B

For this question:
6. c) Which has a higher electron affinity, chlorine (Cl) or Neon (Ne)?
the answer was Cl because Ne is a noble gas but I'm confused on how that effects electron affinity.

Alysia Garcia 1B

For the equation, E=-hr/n^2, I'm still confused as why the negative sign is significant. Is it because when the electron is removed, the system's energy is 0, so the energy must be less than 0? Could someone explain this please? :)

Alysia Garcia 1B

I understand that Chromium and Cooper have exceptions because they are more stable with different configurations (like the normal configuration for copper is [Ar]3d104s1). But how would we apply that to their ions? ex: Cr+3

Alysia Garcia 1B

For the Stern and Gerlach experiment I understand how electrons can be spun up or down but what is the meaning of ms=+1/2 and ms=-1/2?

Alysia Garcia 1B

For the problem we did in class, how would we determine if the outcome of uncertainty is an impossible outcome? the answer was 3.4x10^10 m/s.

Alysia Garcia 1B

For the equation Hψ (n,m,ml)=Eψ (n,m,ml), what exactly does n,m,ml represent and how are they applied to the equation?

Alysia Garcia 1B

In this problem:
If an electron (mass 9.11 x 10-31 kg) has an associated wavelength of 7.28 x 10-9 m, what is its speed? Is your answer reasonable, why?
I got the answer 1x10^-5 m/s, but how would you determine if the speed is reasonable?

Alysia Garcia 1B

For this problem: Calculate the wavelength of a 275 kg single-seat electric car traveling at a speed of 125 km.hr-1. Do electric cars have wavelike properties? I converted the 125 km.hr-1 to meters per second then used that number for the velocity in the DeBrogile Equation but I'm still getting the ...

Alysia Garcia 1B

If 3.607 x 10-19 J is required to remove an electron with zero kinetic energy from a metal surface, what would be the longest wavelength light that could do this?
I understand that you have to use Ek= Energy of incoming photon - work function, but what would I use for the kinetic energy?

Alysia Garcia 1B

For this problem, you are given the frequency 8.7x10^14 HZ. I understand that you have to divide that by the speed of light, 3.00x10^8 ms-1, to find the wavelength but how would you convert that to nm units?

Alysia Garcia 1B

In the video module on the photoelectric effect, he converts the wavelength in meters to pica meters. Do we always have to convert to pica meters when solving for a wavelength?

Alysia Garcia 1B

I was not here for Friday's lecture on the photoelectric effect, could anyone explain what the determinant is?

Alysia Garcia 1B

For this problem I understand how to find the excess reactant but how would you would how many moles of the excess reactant remain?

Alysia Garcia 1B

Oh I didn't even see that! thank you!

Alysia Garcia 1B

Thank you!

Alysia Garcia 1B

For part a, it asks what volume of solution is needed to obtain 2.15 mol of Na+ but in the solution they use 2.15 x 10^-3. Why would you use this number instead of the one given?

Alysia Garcia 1B

For part b on E.9, what are formula units?

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