CHEMISTRY COMMUNITY

Liliana Rosales 1E

If the dipoles of a vsper model cancel out then the molecule would be non-polar. However if the dipoles don't cancel out then the molecule is polar. You can figure out the dipoles by looking at the electronegativity of each element.

Liliana Rosales 1E

I think it will matter because I know sig figs were emphasized for the midterm. So just to make sure and avoid getting points off, it will be best to use sig figs for the final.

Liliana Rosales 1E

Also, just to add on copper, zinc, tin, lead, aluminium, and beryllium tend to be amphoteric as well.

Liliana Rosales 1E

Yes, it is typically is 1x10^-18 :)

Liliana Rosales 1E

It is trigonal planar because each carbon has three electron densities attached to it.

Liliana Rosales 1E

I don't think it is necessarily the sum of the dipoles. As long as you can distinguish if the dipoles will cancel out, then you know is non-polar. If the dipoles don't cancel, then the molecule would be polar.

Liliana Rosales 1E

Hi,
Does anyone know if we are expected to know how to draw structures like the one of Benzene?

Liliana Rosales 1E

If I remember correctly, cis-diamine-dichloro-platinum(II) has a lone pair on nitrogen that is able to bond with DNA which stops cell division. On the other hand, the other structure trans-diammine-dichloro-platinum(II), doesn't have this ability to bond with DNA. This is why cis-diamine-dichloro-pl...

Liliana Rosales 1E

It would be E subscript 3.

Liliana Rosales 1E

Lone pairs create a greater electron repulsion. Therefore, they tend to reduce the bond angles.

Liliana Rosales 1E

If you know the shape of the molecule, then you can know the bond angles. For example, tetrahedral molecules, have bond angles of 109.5°. Just know the bond angles for each of the shapes Lavelle went over in lecture.(Linear, trigonal planar, tetrahedral,octahedral and so forth)

Liliana Rosales 1E

Because elements in the 3rd row and below are part of the d orbital, they are able to have an expanded octet. If the element is found in the third row, then it can have up to 10 extra electrons because the d orbital can hold ten electrons.

Liliana Rosales 1E

Is there any connection between dipoles and polarizability of an ion?

Liliana Rosales 1E

As long as the formal charge of the structure is closest to zero, I believe any resonance structure would be equally stable.

Liliana Rosales 1E

The energy would always be negative because the equation involves a negative sign. However I am not too sure if we can assume that energy is negative.

Liliana Rosales 1E

Cations tend to be smaller in size because they have more protons which means that the electrons are held tightly and closer to the protons. However in anions, there are more electrons which means more electron repulsion. Because of the electron repulsion, electrons tend to spread farther apart and ...

Liliana Rosales 1E

Basically a Lewis structure with one lone pair would be considered a radical. They tend to be really reactive because electrons like to form bonds instead of being a lone pair. You would say your compound is radical when your Lewis structure ended up having one lone electron.

Liliana Rosales 1E

Sara Veerman-1H wrote:Lilianna, I believe the answer to this problem is 2.84x10^-19 J

Thank you Sara!

Liliana Rosales 1E

I would say no just because it wasn't mentioned during lecture. The book tends to have extra information that isn't necessary for the this class in particular. However, it nice to have context and understand what they are.

Liliana Rosales 1E

Alesha, I just want to confirm, what was the answer for this problem?

Liliana Rosales 1E

I would say that oxygen would be more inclined to lose an electron than nitrogen because is O is closer to the gases compared to nitrogen. The closer an element is to the gases, the more it wants an electron to complete an octet.

Liliana Rosales 1E

Chromium and copper are exceptions because they are most stable when their d sub-levels are half or completely full rather than partially full.

Liliana Rosales 1E

Orbitals show the regions with the highest probability of finding electrons. I don't necessarily think orbitals show an electron's pathway because to my understanding, electrons aren't fixed to a certain position.

Liliana Rosales 1E

To my understanding, orbitals are plots derived from a mathematical equation that show the probability of where electrons can be found. However, I'm not too sure about orbitals being electron energy levels and the significance of nodal planes.

Liliana Rosales 1E

The principal quantum number (n) would tell you the size of the orbital. The higher the n value, the bigger the orbital is. Also the n value can indirectly tell you the energy of the orbital. For example, an electron at n=1 would need energy to be absorbed in order to excite the electron onto a high...

Liliana Rosales 1E

Basically in the Stern and Gerlach experiment a beam of silver atoms was shot through a magnetic field and this single beam was divided (halved) into two beams after it passed through the magnetic field, this is why it +1/2 and -1/2. As it has been mentioned before, this also tells if an electron is...

Liliana Rosales 1E

Just to clarify, the work function would be the minimum energy required to take off an electron from the surface of a metal right?

Liliana Rosales 1E

Chem_Mod wrote:It can escape, but you need to supply a sufficiently large enough energy to overcome the barrier (wall of a box)

I had the same confusion, this was helpful. Thank you.

Liliana Rosales 1E

Z is just a symbol that stands for the atomic number or the number of protons of an element.

Liliana Rosales 1E

I agree, it is essential to review those principles because they do lay the foundation for the rest of chemistry. If this foundation isn't solid, then the rest of chemistry will be challenging.

Liliana Rosales 1E

Thank you. This makes more sense now.

Liliana Rosales 1E

Would someone be able to explain how light frequency relates to photons or if there is any relationship between these two concepts?

Liliana Rosales 1E

Dr. Lavelle was saying that we would have to divide the energy by the avogadro's number because the energy is usually given per mole. For problems dealing with the photoelectric effect, you would want to find the energy per photon not per mole. I hope this somewhat clarifies your question.

Liliana Rosales 1E

I believe black bodies absorb the entire electromagnetic spectrum not just the visible spectrum.

Liliana Rosales 1E

Thank you for sharing, your method sounds easier and quicker compared to mine.

Liliana Rosales 1E

You would start by converting 25.13g of Fe2O3 into moles, which is done by dividing the grams given by the molar mass of the Fe2O3. Then you would look at the chemical equation given and see how many moles of Fe2O3 there is for every mole of CO. In this case, for one mole of Fe2O3, there is 3 moles ...

CHEMISTRY COMMUNITY

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Re: Chapter 4 [ENDORSED]

Re: Sig Figs for Final

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Light frequency and photons [ENDORSED]

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