## Search found 20 matches

Sat Jul 29, 2017 8:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: X-->0 when?
Replies: 2
Views: 326

### Re: X-->0 when?

X should probably never be zero because X is supposed to represent an unknown concentration that is trying to be solved in the equilibrium formula. Check back on pg 142 of the course reader for explanation written by Dr. Lavelle. What you are thinking of is when Kc is really small, defined by Dr. La...
Thu Jul 27, 2017 9:59 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: If equilibrium is dynamic and constant then...
Replies: 1
Views: 219

### Re: If equilibrium is dynamic and constant then...

That is exactly what was covered in pgs 138 and 139 of the course reader. Change in concentration, pressure and temperature will change equilibrium. Something can remain at equilibrium if you do nothing to it, but if you start taking out product, then the reactants will be the only things reacting t...
Wed Jul 26, 2017 10:24 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Self Test 2 problem 9
Replies: 2
Views: 373

### Re: Self Test 2 problem 9

https://drive.google.com/open?id=0Bwbyg2fLGHJ7U3VDUHlPRF82amc Picture of the answer through google drive link. Notice first to balance the equation. Use the ICE box. Notice that you are basically given the initial and equilibrium of BrCl. You can solve for change of BrCl with those two. Remember th...
Wed Jul 26, 2017 10:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Problem 11.33
Replies: 1
Views: 248

### Re: Problem 11.33

As you have written out, the problem gave .1 mmol (millimoles). You want to convert moles to concentration which is moles/Liters. Liters is already in the correct units of .5 liters (rather than milliliter). So you have to convert .1 mmol to mols before calculating. So that is .1 mmol * 10 -3 or 1 *...
Sat Jul 22, 2017 8:39 pm
Forum: Ionic & Covalent Bonds
Topic: Chapter 3, Question 73
Replies: 1
Views: 286

### Re: Chapter 3, Question 73

Those are the electronegativity numbers for the elements, you can a find a periodic table with that information on page 87 of the course reader or page 92 in the textbook.
Wed Jul 19, 2017 11:08 pm
Forum: Ionic & Covalent Bonds
Topic: 3.61
Replies: 2
Views: 329

### Re: 3.61

You should look on page 84 of the course reader.

The key point is: atoms in period 3 or higher have d-orbitals in valence shell that accommodate additional electrons.

You can also look at pg 87 in the textbook, 3.10 expanded valence shell section.
Tue Jul 18, 2017 1:45 pm
Forum: Ionic & Covalent Bonds
Topic: Homework problem chapter 3
Replies: 3
Views: 511

### Re: Homework problem chapter 3

CH. 3 49 A.pdf
Mon Jul 17, 2017 7:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 Date
Replies: 1
Views: 268

### Re: Test 2 Date

Pretty sure the recent email should reflect the changes. We did skip molecular orbital theory, so that's probably why we will finish chemical equilibiurm this week and will have the test earlier since test 2 will cover up to chemical equilibrium.
Wed Jul 12, 2017 9:36 pm
Forum: Einstein Equation
Topic: Question 3 Test 1
Replies: 2
Views: 397

### Re: Question 3 Test 1

Here is an image of a full credit answer for you to double check your work.

Tue Jul 11, 2017 9:27 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: problem help
Replies: 5
Views: 1223

### Re: problem help

Heisenberg's uncertainty principle is meant for small objects like electrons, not 2150 kg cars. This calculation will not help in determining error of the radar.

Tue Jul 11, 2017 7:20 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.17 [ENDORSED]
Replies: 6
Views: 1619

### Re: G.17[ENDORSED]

You were given volume of 250ml and Molarity of .20 mol/L. Use the Molarity equation where Moles/Volume= Molarity and solve for Moles. Which is Moles= Molarity X Volume Plug in the numbers: Moles= .20mol/L X .25L (250ml X 10 -3 ) =5 X 10 -2 mol Convert moles to Grams using molar mass of CuSO4 5H20 wh...
Mon Jul 10, 2017 8:38 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: For Exam 1
Replies: 4
Views: 673

### Re: For Exam 1

Exam 1 actually cover material from fundamentals to ch.2. The page numbers are correct though, pages 18-36 is fundamentals and 37-74 is ch.1-2.
Sat Jul 08, 2017 10:14 pm
Forum: Student Social/Study Group
Topic: Thoughts after Test 1?
Replies: 13
Views: 1302

### Re: Thoughts after Test 1?

I think the only way to counter messiness is to write small and to keep steps organized in a pattern. I started from the top left of the question and wrote the steps below each other until I ran out of space and then I moved towards the right of the page. I think another way to counter messiness is ...
Sat Jul 08, 2017 10:13 am
Forum: Photoelectric Effect
Topic: Chapter 1, problem 33
Replies: 2
Views: 430

### Re: Chapter 1, problem 33

This was one of the problems done during the Wednesday review session. The answer was 1.66 x 10-17 J. The numbers you multiplied by were exactly what we used, so may be we just rounded it differently.
Sat Jul 08, 2017 10:03 am
Forum: General Science Questions
Topic: Material Covered on Midterm 1
Replies: 2
Views: 674

### Re: Material Covered on Midterm 1

Chemical bonds will not be on the exam. Ch. 2 is electron configuration and atomic orbitals.
Tue Jul 04, 2017 12:47 am
Forum: Properties of Electrons
Topic: Remembering the Mass of Electron
Replies: 2
Views: 435

### Remembering the Mass of Electron

Will we have to remember the mass of an electron, 9.11 x 10-31 kg, or will this information be given on the test?
Sun Jul 02, 2017 8:57 pm
Forum: Photoelectric Effect
Topic: Wave properties of electrons
Replies: 2
Views: 320

### Re: Wave properties of electrons

Check out the video on Wave Properties of Electrons and The De Broglie Equation Video Module. At 2 minutes 37 seconds of the video, Dr. Lavelle explains the two interferences with better visual representation than during Friday's class.
Sun Jul 02, 2017 8:51 pm
Forum: DeBroglie Equation
Topic: Wave-like properties
Replies: 2
Views: 415

### Re: Wave-like properties

According to what Dr. Lavelle said in class on friday, the cut off is anything after 10-14 or 10-16.
Sun Jul 02, 2017 8:42 pm
Forum: Limiting Reactant Calculations
Topic: Clarification on the Actual Yield
Replies: 1
Views: 430

### Re: Clarification on the Actual Yield

In an actual lab, we would be able to find out actual yield by measuring the final product and compare it to the theoretical yield. However, since we are not doing a lab for every problem, the book and Dr. Lavelle should be giving out the actual yields.
Sat Jul 01, 2017 4:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8245
Views: 1440134