CHEMISTRY COMMUNITY

JOtomo1F

The porphyrin ligand bonds to Fe which forms the heme complex. When the heme complex binds to a protein, it forms myoglobin where Fe can bind to one oxygen (O2) molecule. To make hemoglobin, four myoglobins can bind together.

JOtomo1F

It is any atom besides the central atom. So pretty much everything connected/surrounding the central atom.

JOtomo1F

Hemoglobin is formed when four myoglobin molecules bond together.

JOtomo1F

kevinchang_4I wrote:Will the answers to the Minimarshmallows be posted? Thanks!

I was also wondering how soon the answers would be posted.

JOtomo1F

Tiffany Chen 1K wrote:For #31 should the name be ...nickel(III) ion? The complex has a 2+ charge.

Yes, tonight Lyndon mentioned this was an error in the final review packet.

JOtomo1F

For number 41(c), it asks which pair of atoms on thymine are most tightly bounded and why, between C=C, C=O, and C=N. However, O don’t see a C=N bond in the structure. Is there a mistake? I believe you're correct in saying that there is no double bond between carbon and nitrogen. You can still unde...

JOtomo1F

I'm a bit unsure about this as well since the email just sent out says that the final covers all material.

JOtomo1F

I think this online response answers your question pretty thoroughly; hope it helps!

https://www.quora.com/How-does-electronegativity-of-an-atom-affect-bond-angle?redirected_qid=18309171

JOtomo1F

Can someone further explain this? I still don't understand how this is polar. No matter where the two Cl remain within the tetrahedral shape, the dipoles won't face the same way, so how can it be polar? Or is any molecule polar as long as their dipoles don't cancel???? Yeah, if there are dipoles th...

JOtomo1F

I think this might be an error in the solutions manual. I got the same numbers and answer that you did.

JOtomo1F

I think this might be a typo/error in the solution manual because your work is correct. I got the same numbers as you as well.

JOtomo1F

Could you write out the equation that you need help inputting on this chemistry community post?

JOtomo1F

This is really helpful, thanks!

JOtomo1F

While the Lewis dot structure may look like its dipoles cancel out when you draw the two bromine atoms and two chlorine atoms diagonally, the shape tetrahedral is polar since it is asymmetrical. https://www.google.com/imgres?imgurl=https%3A%2F%2Fchem.libretexts.org%2F%40api%2Fdeki%2Ffiles%2F1314%2F2...

JOtomo1F

Okay just making sure. Thank you!

JOtomo1F

The question reads, "Consider the bonding in H2CPCHCHO. (a) Draw the most important Lewis structure. Include all nonzero formal charges." What does it mean by the most important Lewis structure? Does that just mean the most stable?

JOtomo1F

This is where people get tripped up on from Lewis structures and determining if a molecule is polar or non-polar. Even though the drawing may look as if the dipoles are cancelling, you must refer to the VSEPR model in order to see the actual angles and where the bonds are.

JOtomo1F

I was also wondering if we needed to know this calculation for Test 2.

JOtomo1F

Could someone please explain to me what we are supposed to know about ion-dipole interactions? I am a also a bit confused on why the syllabus does not tell us to read section 3F.2 if this material is going to be on Test 2.

JOtomo1F

I believe this is because even though there are multiple bonds, it is still in a single region and is therefore considered to be a single region of electron density.

JOtomo1F

Joseph Saba wrote:he might but just in case use intuition about what is bonding together (ion-ion, a nonmetal and a metal, metal and a metal, two nonmetals, etc.

Could you expand on this please? What kind of bonds form from the interactions you just mentioned?

JOtomo1F

Do you have a specific example that you were wondering about?

JOtomo1F

Also if you look at the trend of electronegativity, oxygen is more electronegative than S which could partially explain why the oxygen atoms have a slightly more negative charge.

JOtomo1F

I'm not too sure about this but I would say if there aren't any homework problems relating to it I would say it's highly unlikely you would need to know the math behind it. Or we might learn it sometime this week or in the future.

JOtomo1F

Debora Fernandez Clemente_ 4H wrote:what was the last topic we covered for the midterm?

The last topic we covered for the midterm was Topic 2D in the book. It's also posted on Dr. Lavelle's website under the announcements!

JOtomo1F

I was also confused about this question and was wondering the same thing.

JOtomo1F

Does anyone know if Test 2 will be cumulative? Or just on the most recent materials?

JOtomo1F

sarahsalama1G wrote:when will Test 2 be?

I’m pretty sure in the syllabus it says during Week 8.

JOtomo1F

Someone else asked this question and I thought there was a good response to it. "Each electron in an atom has a probability function that tells us the probability of finding an electron at a given point within that orbital." Hope that helps a bit!

JOtomo1F

Claire Stoecklein 1E wrote:Each electron in an atom has a probability function that tells us the probability of finding an electron at a given point within that orbital.

What exactly is the probability function of each electron? Is that the four quantum numbers?

JOtomo1F

I was also wondering what that this subject meant on the Quantum World outline.

JOtomo1F

Schrodinger’s equation uses a wave function to describe an electron because of its wavelike properties and indeterminacy in momentum and position. The wave function represents the orbital (position) that and electron can be found. Do we just have to know the concepts behind Schrodinger's equation? ...

JOtomo1F

16 sodiums walk into a room. Who's next?

Na-Na-Na-Na-Na-Na-Na-Na-Na-Na-Na-Na-Na-Na-Na-Na Batman!

JOtomo1F

ayushibanerjee06 wrote:
Ada Chung 1C wrote:Will the mini dino nuggets answer key be posted as well?

Will they be posted? pls help us out

Hello! Also just wondering if the mini dino nuggets answer key will be posted anytime soon. Thanks!

JOtomo1F

Hello! I know all of the lectures got cancelled for today, and I was wondering if that means that all of the TA and UA Office Hours are cancelled as well. Thanks!

JOtomo1F

What part of the question are you having trouble with?

JOtomo1F

I am not exactly sure on the general rules for this. But for this specific example, carbon likes to have four bonds so they are in the middle and are bonded to the most elements. Hydrogen likes to only form one bond so that the first shell is completely filled, which explains why each hydrogen is on...

JOtomo1F

Do these two terms have the same trends across the periodic table?

JOtomo1F

In another post on this topic, the Chem Moderator stated that this is out of the course study so we do not need to know much about it!

JOtomo1F

Oxygen, hydrogen, sulfur, sodium, and phosphorous walk into a bar.
“OH SNaP!” says the bartender.

JOtomo1F

D does not represent the photoelectric effect. Instead, the equation shows the inverse relationship of frequency and wavelength.

JOtomo1F

Even though this is not required knowledge, in the book it states that the total intensity of radiation emitted over all wavelengths increases as the fourth power of the absolute and is shown in the Stefan-Boltzmann law and is usually written as
Total intensity = constant X T^4

JOtomo1F

This is false since wavelength and frequency are inversely proportional. Radiowaves have a longer wavelength and lower frequency than UV light and therefore, their photons have a lower energy.

JOtomo1F

Each electron shell is divided into subshells which are made up of orbitals. Each orbital is named by a letter (s-, p-, d-, f-) and hols electrons with up and down spins.

JOtomo1F

I believe in lecture that Dr. Lavelle said we have to understand the concept behind the equation rather than use the equation.

JOtomo1F

Electron spin is an unvarying number of either 1/2 or -1/2. The 1/2 spin applies to an "upward spin" of an electron and is represented in an electron configuration by an upward arrow. The -1/2 spin refers to the "downward spin" of an electron and is represented in an electron con...

JOtomo1F

For ml, it takes all values from -l to +l or vice versa. L for the d-orbitals = 2, so the ml values for d-orbitals goes from -2, -1, 0, 1, 2.

JOtomo1F

We don't need to know too much about Schrodinger's Wave Equation, hence why in the syllabus we skip Focus 1D, which talks about this equation.

JOtomo1F

What do you mean by the nature of the electron? Like the electron's position or distance between the two photon beams as in the examples?

JOtomo1F

I don't think the question would directly tell you to use this equation, but I know when we lectured about the photoelectric effect, this equation was required to complete the worked example. So if you have those notes, I would take a look back at those! We also reference this equation when we deriv...

JOtomo1F

I had this question too, since the book used it in a confusing way. I asked my TA and he said that formula units is the empirical formula but for an ionic compound. However, since we don't need to know what an ionic compound is yet, when they ask for formula units they just means molecules. Yeah, I...

JOtomo1F

I was also wondering how we can see our score for our Chemistry Community responses each week.

JOtomo1F

This was really useful, thank you!

JOtomo1F

I hope we would be allowed to refer to a chart but I am not sure at all.

JOtomo1F

Can someone explain what formula units are? I am a bit unclear about this topic.

JOtomo1F

Okay thanks everyone.

JOtomo1F

Hi, does anyone know if we need to buy our own blue book or scantron for the test this upcoming week? Thanks!

JOtomo1F

Here are a couple rules I found online: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. what are trailing zeros in the decimal portion? Here is an example of trailing zeros ...

JOtomo1F

Here are a couple rules I found online: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. My question: When you say 'any zeros between two significant digits are significant',...

JOtomo1F

I also read from the textbook "When reporting the results of multiplication and division, identify the number of digits in the least precise value and retain that number of digits in the answer." as well as "When reporting the results of addition or subtraction, identify the quantity ...

JOtomo1F

Here are a couple rules I found online:
Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal portion ONLY are significant.

JOtomo1F

Hey everyone, I was reading through the fundamentals pages and got stuck with this problem. Can anyone help out? Thanks! Self-test A.5A What is the gravitational potential energy of this book (mass 2.0 kg) when it is on a table of height 0.82 m, relative to its potential energy when it is on the flo...

JOtomo1F

I also need help with this problem.

JOtomo1F

What is a good price range to be spending on a scientific calculator?

JOtomo1F

I was confused with sig figs too and found the crash course youtube video to be pretty helpful.

JOtomo1F

This was such a cool story to read about and helped ease some worries of mine. I was wondering what do you think the hardest part of medical school is?

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