CHEMISTRY COMMUNITY

KTran 1I

Students who previously took this class have told me that anything on his slides is fair game for tests, so it would probably be helpful to familiarize yourself with some of the examples from class, like cisplatin and heme complexes.

KTran 1I

Mai V 3E wrote:Does anyone have a video they think is a good reference for this topic?.

I found that this video gave a quick, comprehensive definition of amphoteric molecules with examples: https://www.youtube.com/watch?v=_t_4cCi8jiI

KTran 1I

What are the possible types of titrations? What is the difference between neutral and ionized titrations?

KTran 1I

Any structure that has resonance has delocalization and these bond lengths are in between that of single bonds and double bonds.

KTran 1I

Does anyone have any tips for remembering or identifying the hybrid orbitals of compounds?

KTran 1I

If you have class notes, it would also be helpful to review them since anything from his lecture slides could be on the final as well.

KTran 1I

How would we know the oxidation number if the formula is just given? Certain ions have fixed oxidation states like oxygen is always (2-) and SO4 is always ((2-) and CN is always (-1) and so on. Molecules like H2O and gases like HOFBRINCl have an oxidation number of (0). https://d2jmvrsizmvf4x.cloud...

KTran 1I

A ligand is called a chelate when it binds to two or more sites. In the “endorsed posts” section there is a topic about chelating that explains it in detail that would be helpful to look at. :)

KTran 1I

I think that going over each unit outline will be a good way to review the big ideas of each topic we should know for the test. Also doing the practice problems again would probably be helpful.

KTran 1I

Acid rain is the result of chemical reactions with water and carbon dioxide, sulfur dioxide, or nitrogen oxides that results in the formation of an acid, respectively, carbonic acid, sulfurous acid, and nitrogen acids. During lecture examples that involved sulfur dioxide and nitrogen oxides were used.

KTran 1I

I am still a little confused about determining when hybridization would occur, does anyone have any tips for memorizing when a molecule would have hybridization and how many hybrid orbitals there would be?

KTran 1I

In general, the more s-character properties in hybridization, the stronger the bonds will be. Therefore, as stated in the previous posts, bonding between sp2 hybridizations would be stronger than bonding in sp3 hybridization.

KTran 1I

For coordinate compounds, the order of the atomic symbols does matter. The ligand names would be in alphabetical order (either using their prefixes or the name of the element), followed by the name of the transition metal cation name.

KTran 1I

Would we need to know how to draw structures of some of the biological examples that Dr. Lavelle gives in class for the final?

KTran 1I

To calculate the oxidation number for a metal in a compound, you would usually be able to do this by finding the overall charge of the molecule and then subtracting the total charge of the anions. The difference would be the charge of the metal.

KTran 1I

For the final, would we actually need to be able to draw the shape of the molecules and show the sigma and pi bonds?

KTran 1I

Test 2 will cover everything from the midterm up until the information from Monday's (11/18) lecture, which includes intermolecular forces, VSEPR, and sigma and pi bonding.

KTran 1I

Will we need to have the specific bond angles for each molecular shape memorized for Test 2?

KTran 1I

I may be wrong, but I believe that Dr. Lavelle said it is acceptable if we draw Lewis structures without showing the molecular shape as Lewis structures are meant to simply model the bonding and lone pairs.

KTran 1I

When determining molecular shape with the VSEPR model, single, double, and triple bonds are all considered to be one area of electron density. This means that regardless of the type of bond, the shape would still be determined as if there was a single bond there.

KTran 1I

A good example of this would be H20 which due to the two lone pairs on the oxygen takes on a bent shape with bond angles < 109.5 degrees.

KTran 1I

Ions should follow the same guidelines but may differ from their nonionic counterparts due to the presence of absence of lone pairs.

KTran 1I

Does anyone know if we would be tested on specific bond angles on Test 2?

KTran 1I

The molecular shape for H2O is bent because the lone pairs will repel each other more than they repel the bonded pairs. Most often Lewis structures of H2O are drawn with the two lone pairs angled above the oxygen, so this might be a more helpful way of drawing the structure so you remember that the ...

KTran 1I

To add on to the other responses, there will be a stronger dipole moment when there is a greater electronegative difference between the two atoms.

KTran 1I

If the central atom has two bonding pairs and no line pairs it would be linear.

KTran 1I

Thank you for this tip! Does anyone have any similar tips for determining if a molecule is polar without being given the electronegativity values for atoms? Also, will we be provided with these values on the midterm?

KTran 1I

The structure that has the lowest net formal charge is the most probable structure, however, it is important to note that some individual atoms may prefer to have a +/- formal charge due to their electronegativity relative to the other atoms in the molecule. For example, an oxygen atom with a 1- cha...

KTran 1I

I believe that we should do problems from Outline 3: Chemical Bonds since that is most applicable to what we have been learning in lecture.

KTran 1I

Yes, on his website there is a test and exam schedule and we only have one midterm, but we have Test 2 beginning the week of November 19.

KTran 1I

Which M^2+ ions (where M is a metal) are predicted to have the following ground-state electron configurations?
(a) [Ar]3d^7
(b) [Ar]3d^6

The answer in the solutions manual is (a) Co^2+ and (b) Fe^2+, but can someone explain how to get these answers?

KTran 1I

Do we need to memorize ions and ionic compounds for the midterm and other tests? Specifically will we have to identify the formula and charge of an ion/compound given the name?

KTran 1I

I don't think so since even checking formal charge I don't think can tell you if you're correct - it can just tell you which potential lewis structures are better/more likely to be correct. But, when it comes to figuring out a good lewis structure that is likely to be experimentally correct, you ca...

KTran 1I

For it to be considered more stable, is it the central element that has to be closest to 0 or the surrounding ones as well? Ideally, the central element and all the other elements should have a formal charge of zero or close to zero because this would indicate that the electrons are evenly distribu...

KTran 1I

The order would be P^3- > S^2- > Cl- Across a period, atomic radius decreases because the positive charge of the nucleus increases, therefore increasing the pull on the electrons. Since electrons are added, the net positive pull on all the electrons decreases (the positive charge has to spread out o...

KTran 1I

As stated in the previous replies, the DeBroglie equation can only be used for objects that have rest mass, which does not apply to light. The equations λν = c or the E = hν are applicable to light. Is light the only thing without rest mass? And I'm also confused as to how rest mass apply to electr...

KTran 1I

In the equation for part a derived in the solution manual, I understand the derivation and application, but where does the ^-1 come from? (the equation given is E=hcλ^-1)

KTran 1I

I understand the definitions of the Pauli Exclusion Principle and Hund’s Rule, but can someone clarify how they are applied. Thank you!

KTran 1I

Nodal planes are areas in which the probability of finding an electron is zero, which can be found using the Schrodinger equation.

KTran 1I

Along with being able to recognize the exceptions and write them, it is probably helpful to understand the reasoning behind the exceptions. The reason why the electron configurations in the post before this one ([Ar]3d^5 4s^1, Cu: [Ar] 3d^10 4s^1, Mo: [Kr] 4d^5 5s^1, and Ag: [Kr]4d^10 5s^1) are writ...

KTran 1I

Debora Fernandez Clemente_ 4H wrote:What is the partial full one you are referring to in these exceptions?

I think what is meant by the partially full shell is referring to the d sub-shell. A full or half full d shell is more stable than a partially filled d shell.

KTran 1I

S-orbitals have electrons that are distributed spherically symmetrical around the nucleus so while they do not have any nodal planes, the s-orbital does have radial nodes. The 1s orbital would not have any nodes, but the 2s orbital would have one node, the 3s orbital would have two nodes, etc.

KTran 1I

If we need to leave early from a workshop would that be okay? During lecture, Dr. Lavelle said that the Peer Learning sections were designed to be flexible so we can come in and leave at any time, but I don't know if this applied to workshops as well.

KTran 1I

There is no "one way" of balancing equations, but some helpful tips would be to start by balancing elements that have the greatest number of atoms in the reactants or products, other than hydrogen and oxygen. I usually balance oxygen or hydrogen last and if both are in the reactants or pro...

KTran 1I

Drake Choi_1I wrote:Is it effective to do the whole homework list? Or should I focus on doing a few problems from each section?

It is probably helpful to do all the homework problems so that you have practice with the concepts and the style of questions, which will probably helpful for tests.

KTran 1I

As stated in the previous replies, the DeBroglie equation can only be used for objects that have rest mass, which does not apply to light. The equations λν = c or the E = hν are applicable to light.

KTran 1I

The grouping of the lines in the Lyman and Balmer Series corresponds to the states that hydrogen starts and ends in as well as the type of electromagnetic radiation is emitted. The Balmer Series are the energy transitions that involve the n=2 state of hydrogen and are all part of the visible light s...

KTran 1I

Are there a lot of topics in the book that are not covered during lecture that show up on tests?

KTran 1I

I believe that anything we went over in class or anything that we did in the homework is fair game for the test, except for the quantum topics.

KTran 1I

Abraham De Luna wrote:He specified to do either fundamentals or quantum world for homework 2.

Would there be any benefit to do one or the other, such as if one would better prepare us for a test or quiz?

KTran 1I

Does anyone know if there is a resource to find an approved list of calculators?

KTran 1I

Is it recommended to just show all of our work when possible? Also, do we need to include the specifications for the element/compound in our calculations?

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