CHEMISTRY COMMUNITY

Daniel Bowen 3I

Salts that contain the conjugate base of a weak acid will raise the pH by removing protons from water and generating OH-. Similarly Salt containing an acid will lower solution pH by adding protons to water and increasing H3O+

Daniel Bowen 3I

I would know the difference between Lewis and Bronsted acids and bases. Be able to determine in an equation which is the conjugate acid and base, and how they affect pH. Know how to write the chemical equations for acids and bases.

Daniel Bowen 3I

An acid is stronger when it has an easier ability to dissociate its electrons. HI is a strong acid because it has a large ionic radius therefore it can lose electrons from its valence shell easier, making it a strong acid

Daniel Bowen 3I

There are some common ligands that you should familiarize yourself with the charges. But as for finding the oxidation state of transition metals, it is based on the overall charge of the coordination compound. For example: Ag(CN)2- has an oxidation state of +1 because CN has a charge of -1 and there...

Daniel Bowen 3I

So would anything that is not a monodentate be considered polydentate?

Daniel Bowen 3I

Coordinate number is the number of coordinate bonds formed by a center metal.
For example: [Cr(H2O)4(Cl2)]+ has a coordination number of 6 because there are 6 possible bonds to be formed by the transition metal

Daniel Bowen 3I

Carbon is definitely more electronegative than nitrogen. May I ask what you were discussing in the review session that would cause you to doubt?

Daniel Bowen 3I

Acid strength is based on how easily an atom can dissociate its electrons, as you go down a group there is more valence rings which allow for easier dissociation because the valence shell is farther away from the protons.

Daniel Bowen 3I

Dr. Lavelle stated that everything on the syllabus will be fair game. There are 8 questions with multiple parts so I would assume at least one of the questions to be about the quantum world.

Daniel Bowen 3I

The lone pairs that would accompany certain atoms in thymine can be donated to a transition metal or a charged particle, making thymine a base. A lewis base is described as an electron pair donor

Daniel Bowen 3I

Would there be any cases where we wouldn't assume 100% dissociation and if so what would they be

Daniel Bowen 3I

Will someone please explain question 40 part B and C

Daniel Bowen 3I

If you haven't done the churro packet I would recommend doing that as well as all of the homework problems. There are usually some practice problems posted by TAs and UAs on Chem Community

Daniel Bowen 3I

Can someone please explain 33 part C?

Daniel Bowen 3I

allisoncarr1i wrote:So will everyone between 50% and 73% all get a C- regardless of their actual percentage?

Yes I believe that is how he does his grading

Daniel Bowen 3I

A compound is said to be chelating when the ligand is polydentate. I think the only way that they would test this would just to ask us straight up if the ligand is chelating

Daniel Bowen 3I

No it does not. The dipole moments cancel each other out and there is no overall dipole

Daniel Bowen 3I

Some common neutral ligands are H2O, NH3, and CO. They are neutral because they have a charge of zero and do not affect the charge of the overall ligand complex

Daniel Bowen 3I

It is not necessarily only based on the charge. For the most part it is, however it is based on the size. Take O2- and N3- for example. N3- is more polarizable because it has less protons and therefore a lesser pull on the electrons.

Daniel Bowen 3I

For AX2E2 there are 4 regions of electron density therefore the angle measures are treated as those of a tetrahedral while AX2E has three regions of electron density and the angle measures should be treated as such.

Daniel Bowen 3I

For calculating the oxidation state first you must look at the overall charge of the compound, in this case -4. It is known that CN has a charge of -1. Therefore the oxidation state of Fe must be +2 because the combined charges of the ligand and the transition metal must equal the overall charge of ...

Daniel Bowen 3I

For question 34, once I have the Molarity of both compounds how do I find the pH with the two Molarities of HCl and CaO?

Daniel Bowen 3I

Will the conversion of eV to joules be given for the exam or are we expected to know the conversion?

Daniel Bowen 3I

I don't believe it is necessary for you to know for the test, but I think it would be a good idea to just review it so you have a general idea in case it is brought up.

Daniel Bowen 3I

Test 2 will cover all of the Quantum mechanics we have gone over in lecture. The modules will help you with the types of problems we will see on the exam.

Daniel Bowen 3I

Does anyone know if h bar will be a given constant or if we will have to find its value mathematically in each problem

Daniel Bowen 3I

I would say that more often than not the units used will be Joules instead of kj but be able to convert both ways just in case.

Daniel Bowen 3I

I would do all of the modules provided. Also if you have time go through every homework question listed for the textbook version you have. I would recommend going to the peer learning/ step-up sessions

Daniel Bowen 3I

I believe Dr. Lavelle stated that the Rydberg equation is used specifically for hydrogen ions, but there was an exception for helium as long as it had one electron. The equation is to be used for atoms that have one electron which is why it is almost exclusively used for hydrogen atoms

Daniel Bowen 3I

Is the week three homework strictly Quantum World? I know last week was flexible on which section to do problems for so I was wondering about this week.

Daniel Bowen 3I

When I solve problems I don’t round until the very end and keep all my sigfigs but sometimes the answer I get is 0.01-0.02 digits different from the one in the solution manual. Will this be a big problem on the homework/test? I don't know about you but my TA said that as long as it is within .1 of ...

Daniel Bowen 3I

Simran Athwal-Dis 3A wrote:Hello! I had a question regarding atomic masses. Do we round the atomic masses on the periodic table or leave them as is?

I would leave them as is and you can round using significant figures at the end of the problem

CHEMISTRY COMMUNITY

Search found 32 matches

Re: Identifying Acidic & Basic Salts

Re: Regarding the final

Re: strong acid

Re: naming

Re: Polydentate

Re: Coordinate #

Re: Electronegativity

Re: Strength of acid

Re: Finals

Re: what specifically makes thymine a base.

Re: Acid dissociation

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Re: Worksheets/Practice

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Re: curve?

Re: Chelating Compound

Re: Dipole dipole moments

Re: Ligands

Re: Polarizability

Re: Bent molecular geometry

Re: Oxidation state

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

eV

Re: Regions of Light

Re: Test 2

H bar

Re: SI Unit for Work Function

Re: Studying techniques

Re: Rydberg constant

Homework Week 3

Re: answer accuracy

Re: Rounding Up [ENDORSED]