## Search found 24 matches

Tue Aug 01, 2017 4:36 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Henderson-Hasselbalch Equation
Replies: 3
Views: 1051

### Re: Henderson-Hasselbalch Equation

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.
Tue Aug 01, 2017 4:30 pm
Forum: Calculating the pH of Salt Solutions
Topic: Video on Acidic, Basic, Neutral Salts
Replies: 2
Views: 469

### Re: Video on Acidic, Basic, Neutral Salts

The video was pretty helpful with clarifying things. Has anyone found other videos that were helpful for doing the actual calculations?
Tue Aug 01, 2017 3:58 pm
Forum: *Titrations & Titration Calculations
Topic: Exercise 13.23
Replies: 1
Views: 935

### Exercise 13.23

"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 ...
Tue Aug 01, 2017 12:51 am
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Exercise 13.5 (b)
Replies: 1
Views: 604

### Exercise 13.5 (b)

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?
Sun Jul 30, 2017 3:19 pm
Forum: Lewis Structures
Topic: Octet Rule [ENDORSED]
Replies: 9
Views: 1022

### Re: Octet Rule[ENDORSED]

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 ...
Sun Jul 30, 2017 3:16 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Equations for Calculating pH and pOH
Replies: 1
Views: 360

### Equations for Calculating pH and pOH

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?
Sun Jul 30, 2017 3:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Solutions to Test 2
Replies: 1
Views: 372

### Solutions to Test 2

Will the solutions for Test 2 be posted? I think they'd be helpful for better understanding the material.
Sat Jul 29, 2017 2:31 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs. Bronsted/Lowry
Replies: 1
Views: 298

### Lewis vs. Bronsted/Lowry

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?
Sun Jul 23, 2017 10:23 am
Forum: Lewis Structures
Topic: Checking for Formal Charges
Replies: 1
Views: 250

### Checking for Formal Charges

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?
Sun Jul 23, 2017 10:13 am
Forum: Lewis Structures
Topic: Tips for completing Lewis Structures
Replies: 4
Views: 433

### Re: Tips for completing Lewis Structures

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,...
Sun Jul 23, 2017 10:06 am
Forum: Student Social/Study Group
Topic: Molecular Shapes
Replies: 1
Views: 328

### Re: Molecular Shapes

It would probably be more efficient to focus on the shapes in the course reader because those are the ones we covered in class.
Fri Jul 21, 2017 10:47 pm
Forum: Octet Exceptions
Topic: Exercise 3.59 - Question on Radicals
Replies: 3
Views: 359

### Exercise 3.59 - Question on Radicals

"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...
Sun Jul 16, 2017 12:59 pm
Forum: Trends in The Periodic Table
Topic: 1st and 2nd ionization energy? [ENDORSED]
Replies: 7
Views: 2347

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

Why does it require more energy to remove yet another electron?
Sun Jul 16, 2017 12:52 pm
Forum: Student Social/Study Group
Topic: Lewis Structure Module?
Replies: 3
Views: 435

### Re: Lewis Structure Module?

Will any assessments on Lewis Structures be posted? I found those particularly helpful, considering that some of the questions were on Exam 1.
Sun Jul 16, 2017 12:43 pm
Forum: Lewis Structures
Topic: Octet Rule [ENDORSED]
Replies: 9
Views: 1022

### Re: Octet Rule[ENDORSED]

Do we have these exceptions to the octet rule only when we are more concerned with formal charge?
Mon Jul 10, 2017 7:07 pm
Forum: Student Social/Study Group
Topic: Monday Review Session
Replies: 1
Views: 317

### Monday Review Session

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!
Sun Jul 09, 2017 9:57 pm
Forum: Limiting Reactant Calculations
Topic: Test 1
Replies: 4
Views: 672

### Re: Test 1

If I cannot make the review sessions, would it be possible to receive my test during my respective section?
Sun Jul 09, 2017 9:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Summer Bruincast
Replies: 6
Views: 729

### Re: Summer Bruincast

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.
Sun Jul 09, 2017 7:22 pm
Forum: Student Social/Study Group
Topic: Thoughts after Test 1?
Replies: 13
Views: 1302

### Re: Thoughts after Test 1?

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?
Wed Jul 05, 2017 6:37 pm
Forum: Limiting Reactant Calculations
Topic: Exercise M.11 - Part (c)
Replies: 1
Views: 8105

### Exercise M.11 - Part (c)

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: ...
Sun Jul 02, 2017 1:48 pm
Forum: DeBroglie Equation
Topic: Test Questions
Replies: 2
Views: 412

### Re: Test Questions

Will the test require knowledge on naming molecular compounds?
Wed Jun 28, 2017 8:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Summer Bruincast
Replies: 6
Views: 729

### Re: Summer Bruincast

Ah okay, thank you! If I missed some details in lecture, would the online modules posted on the class website be sufficient for studying?
Wed Jun 28, 2017 8:32 pm
Forum: Molarity, Solutions, Dilutions
Topic: Exercise E.1 - Question on Units
Replies: 3
Views: 430

### Exercise E.1 - Question on Units

"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 ...
Wed Jun 28, 2017 3:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Summer Bruincast
Replies: 6
Views: 729

### Summer Bruincast

Is this class BruinCasted for the summer?