CHEMISTRY COMMUNITY

Samantha Burmester 3H

Nutrient that helps keep the body’s nerve and blood cells healthy
Helps make DNA and prevent megaloblastic anemia

I’m unsure if we need to know more than that but that is what I found through independent research.

Samantha Burmester 3H

Is amphoteric only associated with H2O?
And is amphiprotic only associated with the donor of a Hydrogen proton?
Or are they descriptive words for other atoms or compounds as well?

Samantha Burmester 3H

Are there questions where you have to find the molarity or will that always be a given?

Samantha Burmester 3H

Is the process the same for finding the hybridization of an outer atom as it is for the central atom?

Samantha Burmester 3H

For coordination number 4, the shape can be square planar or tetrahedral. Are we required to identify which one it is or just know that it could be either?

Samantha Burmester 3H

How do you identify dipole dipole?

Samantha Burmester 3H

Are there any examples to know outside of the ones below?

Myoglobin
Guanine and Chlorine
Cisplatin
Hemoglobin

Samantha Burmester 3H

Margaret Akey wrote:so the iron atom is tridentate?

No, because tridentate means 1 ligand bonding three times

But in this case, it is 3 different ligands.

Samantha Burmester 3H

Is dien bidenate? I know its coordination # is 4 but in my notes there is no “tetradenate” so what would you call it?

Samantha Burmester 3H

The compound [Co(NH2CH2CH2NH2)2(CN)(Cl)]Cl (pardon the lack of subscripts) would be written as chlorocyanobisethylenediaminecobalt (III) chloride because the ethylenediamine already has a "di-" in it, or in other words it is already a polydentate molecule, so if there are two in the compl...

Samantha Burmester 3H

Can someone explain this further or use an example?
I’m trying to understand when to use which prefix.

Samantha Burmester 3H

Is either one incorrect? If we choose the -o version, will we get it wrong?

Samantha Burmester 3H

The question is asking the formula for some coordinate compounds.
For part c, tetraamminediaquacobalt(III)bromide, why in the formula ([Co(NH3)4(H2O)2]Br3), is there 3 Br?

Samantha Burmester 3H

Will we be given the document on lavelles website titled “naming coordination compounds” on the test or do we need to memorize it?
In the homework problems, it says to refer to the table for most of them.

Samantha Burmester 3H

A smaller, highly charged cation has greater power.

Which of these factors has a greater factor in the polarizing power?
For example, if a cation is smaller than the one in comparison but it has a lower charge, does it still have a greater polarizing power?

Samantha Burmester 3H

What is the difference between the two? Is it just that one is for anions and one is for cations?

Samantha Burmester 3H

Are they experimentally measured? If so, are we just required to know the trend of the length dependent on the atom and type?

Samantha Burmester 3H

Is electronegativity measured experimentally or do we have to find it with a formula?

Samantha Burmester 3H

The last example we did in Nov 19th’s lecture was of Ethene.

I don’t understand why in the hybrid orbitals Lavelle put one electron in each of the three orbitals 2sp2 and then one in 2p. Is it because of the carbon interactions? And is the 2p hybridized?

Samantha Burmester 3H

Will we be required to draw the hybrid orbitals in electron configurations?

Samantha Burmester 3H

In the notes, Lavelle gave an example about how shape and bond angles affect the bond strength and stability of the molecule.

“Ex: spherical molecule would have a lower boiling point than rod shaped molecule with the same molecular formula”

Why is this true?

Samantha Burmester 3H

What are the rules for when a 0 is significant regarding the decimal point?
For example, how many significant figures are in the number 0.0850?

Samantha Burmester 3H

Hybrid resonance is just when all of the resonance structures have the same formal correct? And if one of the structures has a lower formal charge, it’s just more stable. Is there a specific name for the more stable structure?

Samantha Burmester 3H

Is it true that hallogens can not form double bonds? A TA said this in a review session but many others have said it is not true and I would like to confirm.

Samantha Burmester 3H

Ionic is between a metal and nonmetal and covalent is between a nonmetal and nonmetal.
Is there another way to identify between the two or are we expected to know other differences?

Samantha Burmester 3H

Why do the lone pairs (for expanded octet/extra e-) get added to Iodine instead of the Chlorine?

Samantha Burmester 3H

For B9, it asks you to draw the lewis structures for a few molecules. For part A, why is it that Cl didn’t need to be in brackets when displaying the charge in the final answer? For part b, why is there 3 K+ ions floating around the phosperus and how did they come to that lewis structure for P? And ...

Samantha Burmester 3H

Is the formal charge the determining factor of where to form an expanded octet on an element? For example, if there are two elements in the Lewis structure that are n=3 or below, what formal charge would indicate where to place the expanded octet?

Samantha Burmester 3H

I’m not asking how to change from pm to m. I’m asking how did they come up with that value for the atomic radius? Is there a formula or is there a way to figure it out from the periodic table?

Samantha Burmester 3H

For F.1 in the homework (7th edition), it gives the answer in the solutions manual with a value in pm. Will we be required to find that value for the midterm? If so, how do we do that?

Samantha Burmester 3H

For homework question F.7 (7th edition), the book asks you to order the elements in decreasing ionization energy and explain why. I understand the explanation (the periodic trend is ionization energy decreases down a group and increases across a period). In the solutions manual, it is listing measur...

Samantha Burmester 3H

The atom with the lowest ionization energy level. Also H can never go in the middle.

Samantha Burmester 3H

Why do we have to identify the charge in the Lewis structure if we already added/subtracted the appropriate number of electrons based on the charge of the atom?

Samantha Burmester 3H

Are we allowed to draw bonded elements with two dots or do we have to use the line system? For example, To form SO4^2-, can we put two dots in between S and each of the O’s or do we need to put the line?

Samantha Burmester 3H

In the lecture, Dr. Lavelle says that the Octet Rule is more of a guideline; is this because there are exceptions?

Samantha Burmester 3H

The ionization energy decreases down a group and increases across a period
So does this mean that Flourine (F) would have a higher ionization energy than Chlorine (Cl)?
Does F have the highest energy out of all of the elements?

Samantha Burmester 3H

Are we required to know the shapes of the different orbitals?

Samantha Burmester 3H

Does this equation measure atoms or electrons? OR does it measure light’s wavelengths?

Samantha Burmester 3H

Do electrons have wavelengths? I realize they have wavelike properties but does this mean they don’t have measurable wavelengths?

Samantha Burmester 3H

On the Pre-Module Assessment, #16 is asking for the combustion of butane gas but all it gives is C4H10. Is there a concept that we should already know about combustion? Meaning should I know what butane forms when it combusts without it given in the problem?

Samantha Burmester 3H

For question E15 in the 7th edition textbook, how do you use the molar mass of metal hydrodxide to find the molar mass of it’s sulfide?
In the solutions manual, it subtracts 34.02 g/mol from the molar mass of hydroxide but I’m not understanding the reasoning. Where did that number come from?

Samantha Burmester 3H

Should we be doing the homework with the full avogadros number (6.022) or is it okay to round to 6?

Samantha Burmester 3H

On the homework problems to turn in, do we need to have completely accurate significant figures? For example, is it okay to round in the middle of a problem for the homework or will we be marked down?

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