CHEMISTRY COMMUNITY

Amy Wu 1D

derek1d wrote:Along with this, is there any difference between Ka and pKa? Does the HH equation mean that we will be using pKa?

Ka and pKa are different in that pKa is equal to -log(Ka) and yeah, the HH equation uses pKa. The full equation is on pg. 167 of the course reader if you need it.

Amy Wu 1D

The video was pretty helpful with clarifying things. Has anyone found other videos that were helpful for doing the actual calculations?

Amy Wu 1D

"13.23 (a) Sketch the titration curve for the titration of 5.00 mL 0.010 m NaOH(aq) with 0.005 m HCl(aq), indicating the pH of the initial and final solutions and the pH at the stoichiometric point. What volume of HCl has been added at (b) the stoichiometric point; (c) the halfway point of the ...

Amy Wu 1D

13.5 What is the concentration of hydronium ions in:
(b) a solution that is 0.20 m NH2NH2(aq) and 0.30 m NaCl(aq)?

The solutions manual says that NaCl has no effect, which makes sense. However, how do we know that NH2NH2 is a base and not an acid when writing the equilibrium equation?

Amy Wu 1D

Do we have these exceptions to the octet rule only when we are more concerned with formal charge? These exceptions have more to do with the fact that the d orbital is available, so it is used. Recall that the transition metals have a configuration one less than the row they're in, meaning that the ...

Amy Wu 1D

There seems to be various equations for calculations with regard to acids and bases. Does anyone have a list compiled or something of that sort? In addition, are we going to be given these equations for calculating pH and pOH during Exam 2?

Amy Wu 1D

Will the solutions for Test 2 be posted? I think they'd be helpful for better understanding the material.

Amy Wu 1D

Given that the Lewis acids and bases follow a more generalized definition and are thus somewhat more applicable, will we focus more on Lewis acids and bases or Bronsted-Lowry ones in this class?

Amy Wu 1D

When checking to see if the Lewis structure drawn is the best, we check the formal charges for each atom, but this method seems tedious for more complex molecules. Is there a more efficient way to approach drawing Lewis structures when it comes to checking the formal charges?

Amy Wu 1D

One thing I always make sure to remember is that usually the atom with the lowest electronegativity is the atom that becomes the central atom. I also tried memorizing which atoms had exceptions to the octet rule, such as Sulfur which can exceed an octet and Boron which can have an incomplete Octet,...

Amy Wu 1D

It would probably be more efficient to focus on the shapes in the course reader because those are the ones we covered in class.

Amy Wu 1D

"Write the Lewis structure of each of the following reactive species, all of which are found to contribute to the destruction of the ozone layer, and indicate which are radicals: (a) chlorine monoxide, ClO..." For part (a), I was wondering why the radical belonged to chlorine instead of ox...

Amy Wu 1D

Why does it require more energy to remove yet another electron?

Amy Wu 1D

Will any assessments on Lewis Structures be posted? I found those particularly helpful, considering that some of the questions were on Exam 1.

Amy Wu 1D

Do we have these exceptions to the octet rule only when we are more concerned with formal charge?

Amy Wu 1D

I can't make it to any of the review sessions, so can someone catch me up on what was reviewed today? What problems did we go over and what did you think was particularly important to know? Thanks in advance!

Amy Wu 1D

If I cannot make the review sessions, would it be possible to receive my test during my respective section?

Amy Wu 1D

I don't intend on missing lecture or section either. Is it possible to get modules for later topics? I believe they would be extremely useful for upcoming exams as well as cementing my knowledge.

Amy Wu 1D

I did find pacing really useful, but I was definitely slowed down when it came to interpreting some of the questions. How do you guys typically go about interpreting the questions? Also, how precise do we have to be when (say using the atomic mass of an element) to calculate the answers?

Amy Wu 1D

A reaction vessel contains 5.77 g of white phosphorus and 5.77 g of oxygen. The first reaction to take place is the formation of phosphorus(III) oxide, P4O6: P4(s) + 3 O2(g) --> P4O6(s). If enough oxygen is present, the oxygen can react further with this oxide to produce phosphorus(V) oxide, P4O10: ...

Amy Wu 1D

Will the test require knowledge on naming molecular compounds?

Amy Wu 1D

Ah okay, thank you! If I missed some details in lecture, would the online modules posted on the class website be sufficient for studying?

Amy Wu 1D

"The field of nanotechnology offers some intriguing possibilities, such as the creation of fibers one atom wide. Suppose you were able to string together 1.00 mol Ag atoms, each of radius 144 pm, into one of these fibers by encapsulating them in carbon nanotubes (see Chapter 7). How long would ...

Amy Wu 1D

Is this class BruinCasted for the summer?

CHEMISTRY COMMUNITY

Search found 24 matches

Re: Henderson-Hasselbalch Equation

Re: Video on Acidic, Basic, Neutral Salts

Exercise 13.23

Exercise 13.5 (b)

Re: Octet Rule [ENDORSED]

Equations for Calculating pH and pOH

Solutions to Test 2

Lewis vs. Bronsted/Lowry

Checking for Formal Charges

Re: Tips for completing Lewis Structures

Re: Molecular Shapes

Exercise 3.59 - Question on Radicals

Re: 1st and 2nd ionization energy? [ENDORSED]

Re: Lewis Structure Module?

Re: Octet Rule [ENDORSED]

Monday Review Session

Re: Test 1

Re: Summer Bruincast

Re: Thoughts after Test 1?

Exercise M.11 - Part (c)

Re: Test Questions

Re: Summer Bruincast

Exercise E.1 - Question on Units

Summer Bruincast