## Search found 50 matches

Sat Mar 17, 2018 7:23 pm
Forum: Administrative Questions and Class Announcements
Topic: Answers to red panda practice exam?
Replies: 1
Views: 243

### Answers to red panda practice exam?

CAN SOMEONE PLEASE POST THE ANSWERS TO THE RED PANDA PRACTICE EXAM?
Sat Mar 17, 2018 1:06 pm
Forum: Administrative Questions and Class Announcements
Replies: 1
Views: 209

Can someone post pictures of all the answers from the final review session?
Fri Mar 16, 2018 2:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Answer key to practice final?
Replies: 1
Views: 191

### Answer key to practice final?

Is there an answer key to the practice final?
Wed Mar 14, 2018 4:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Practice Final?
Replies: 1
Views: 241

### Practice Final?

Is there a practice final? If there is, can anyone link it to me please?
Wed Mar 14, 2018 3:12 pm
Forum: General Rate Laws
Topic: How to draw a proposed structure for an activated complex?
Replies: 1
Views: 107

### How to draw a proposed structure for an activated complex?

For example, how do you draw a structure for an activated complex such as:

rate=k[I]^2[Ar]
Wed Mar 14, 2018 3:09 pm
Forum: Phase Changes & Related Calculations
Topic: 15.85
Replies: 2
Views: 231

### 15.85

Whats the difference between unimolecular, termolecular, and bimolecular?
Wed Mar 07, 2018 1:02 pm
Forum: Administrative Questions and Class Announcements
Topic: practice final?
Replies: 4
Views: 352

### practice final?

Is there a practice exam for the final?
Wed Mar 07, 2018 1:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Formulas on test?
Replies: 3
Views: 207

### Formulas on test?

Does this week's test include the 1st order and 2nd order formulas and the half-life formulas or do we have to memorize them?
Tue Mar 06, 2018 7:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Chapters on test?
Replies: 3
Views: 208

### Chapters on test?

Which chapters does the test this week cover?
Tue Mar 06, 2018 7:27 pm
Forum: Administrative Questions and Class Announcements
Topic: review session schedule?
Replies: 2
Views: 156

### review session schedule?

Is the review session schedule for the final out yet?
Wed Feb 14, 2018 10:49 am
Forum: Phase Changes & Related Calculations
Replies: 1
Views: 151

Which chapters will be on the midterm?
Sun Jan 28, 2018 8:05 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Difference between systems? [ENDORSED]
Replies: 8
Views: 411

### Difference between systems?[ENDORSED]

Can someone please explain the exact definitions of open, closed and isolated systems?
Sun Jan 28, 2018 8:04 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Question from test?
Replies: 4
Views: 227

### Question from test?

Is an ice pack making food cold an open system?
Tue Jan 23, 2018 3:16 pm
Forum: Phase Changes & Related Calculations
Topic: Practice Test?
Replies: 2
Views: 184

### Practice Test?

Is there a practice test for Test #1?
Thu Jan 18, 2018 12:48 pm
Forum: Phase Changes & Related Calculations
Topic: HW question
Replies: 5
Views: 248

### HW question

should we do the 14 questions just on chapter 8?
Tue Jan 16, 2018 11:48 pm
Forum: Administrative Questions and Class Announcements
Topic: When is HW due?
Replies: 2
Views: 247

### When is HW due?

Is HW due on Wednesday or during discussion?
Fri Jan 12, 2018 11:16 am
Forum: Administrative Questions and Class Announcements
Topic: Times to post per week
Replies: 5
Views: 317

### Times to post per week

We are required to post a minimum of 3 times per week on chemistry community, correct?
Fri Jan 12, 2018 11:11 am
Forum: Administrative Questions and Class Announcements
Replies: 2
Views: 163

Does the answer book from Chem 14A apply to Chem 14B? Or is there a new one we have to get?
Tue Jan 09, 2018 1:09 pm
Forum: Administrative Questions and Class Announcements
Replies: 1
Views: 180

Is there a course reader available for this quarter?
Sat Dec 02, 2017 11:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Link to Review Session Schedule? [ENDORSED]
Replies: 3
Views: 251

### Link to Review Session Schedule?[ENDORSED]

Can someone please give me the link to the review session schedules?
Tue Nov 28, 2017 9:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Review Sessions [ENDORSED]
Replies: 1
Views: 181

### Final Review Sessions[ENDORSED]

What's the schedule for the final review sessions?
Mon Jul 24, 2017 8:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Review Session
Replies: 1
Views: 193

### Review Session

What time will the review session on monday be?
Mon Jul 24, 2017 3:42 pm
Forum: Naming
Topic: Diaqaua
Replies: 9
Views: 479

### Re: Diaqaua

It means there are two H2O molecules

Di=2
Aqua=H2O

So, Diaqua would be (H2O)2
Mon Jul 24, 2017 3:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.7
Replies: 1
Views: 173

### 11.7

The following flasks show the dissociation of a diatomic molecule, X2, over time:

(Part c) Assuming that the initial pressure of X2 was 0.10 bar, calculate the value of K for the decomposition.

The answer for this is: [(12/17) x 0.1]^2 / (5/17) x 0.1 = 0.17

How do you get 12/17 and 5/17?
Mon Jul 24, 2017 1:29 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: How do you write the MO configuration?
Replies: 1
Views: 210

### How do you write the MO configuration?

I'm still confused on how to write the MO configuration for questions such as 4.53 in the textbook
Sat Jul 22, 2017 5:19 pm
Forum: Hybridization
Topic: how do you find the hybridization [ENDORSED]
Replies: 2
Views: 296

### how do you find the hybridization[ENDORSED]

how do you find the hybridization of molecules?
Wed Jul 19, 2017 4:28 pm
Forum: Administrative Questions and Class Announcements
Replies: 1
Views: 200

Which chapters will test 2 cover?
Wed Jul 19, 2017 4:17 pm
Forum: Ionic & Covalent Bonds
Topic: 3.61
Replies: 2
Views: 272

### 3.61

For hw #3.61,

a. I has 12 valence electrons
b. I has 10 valence electrons
c. I has 12 valence electrons

I thought an atom could only have 8 electrons around it?
Tue Jul 18, 2017 7:51 pm
Forum: Formal Charge and Oxidation Numbers
Topic: #3.49
Replies: 2
Views: 259

### #3.49

It says to determine the formal charge of each atom.

For part a. NO+, the answer book says:
N has a charge of 0
O has a charge of +1

How do you find the charges of each atom?
Tue Jul 18, 2017 7:18 pm
Forum: Lewis Structures
Topic: Number of bonds?
Replies: 1
Views: 185

### Number of bonds?

When drawing a Lewis Structure, how do you know if you have to use a single, double, or triple bond?
Sun Jul 16, 2017 6:24 pm
Forum: Ionic & Covalent Bonds
Topic: Chemical formula?
Replies: 5
Views: 363

### Chemical formula?

How do you find the chemical formula of compounds?

For example, chronium(III) and manganese(II)
Sun Jul 16, 2017 6:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Unpaired electrons
Replies: 4
Views: 449

### Unpaired electrons

I'm still a little confused on how to find the number of unpaired electrons. For example, how would you find the unpaired electrons for 2n^2+?
Tue Jul 11, 2017 10:03 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW #2.51
Replies: 3
Views: 309

### Re: HW #2.51

I think you wrote down the elements from problem 2.52. But either way you'd go about answering the question the same way. I just wrote down the electron configurations and then drew out the aufbau diagram with the arrows just to make it more visibly clear. For question 2.51 part a for example, I lo...
Tue Jul 11, 2017 8:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Hw #2.25
Replies: 2
Views: 356

### Re: Hw #2.25

4P orbitals: n=4 l=1 ml= -1,0,1 so that means the p orbital has 3 orbitals and each orbital can hold 2 electrons so for the 4P orbital it can have 6 electrons 3D n= 3 l=2 ml= -2, -1, 0, 1, 2 so 5 orbitals each holding 2 electron means a total of 10 electrons 1s n=1 l=0 ml=0 so 1 orbital only 2 elec...
Tue Jul 11, 2017 8:32 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW #2.51
Replies: 3
Views: 309

### HW #2.51

How do you find the number of unpaired electrons for the ground state configuration of:

a)Pb
b)IR
c)Y
d)Cd
Tue Jul 11, 2017 7:20 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Hw #2.25
Replies: 2
Views: 356

### Hw #2.25

How many electrons can occupy the (a)4-p orbitals (b)3d-orbitals (c)1s-orbital (d)4-f orbitals of an atom?

How do you find the amount of electrons for an orbital?
Thu Jul 06, 2017 12:44 am
Forum: Student Social/Study Group
Replies: 8
Views: 874

### Re: Self Test 1 Answers

Chels Zh wrote:Hey guys, how did you get no.5, I got an extremely small number, I think I might have got some steps wrong.

This is what I did. Not sure if it's right though
Wed Jul 05, 2017 11:23 pm
Forum: Empirical & Molecular Formulas
Topic: Self test 1 #5
Replies: 2
Views: 427

### Self test 1 #5

6.40g of a compound was burned in air and produced 8.80g of CO2 and 7.20g of H2O. Find the Empirical formula of the compound

How do you find the moles of Oxygen when I know that the mass is 3.2? Do I just divide by 16?
Wed Jul 05, 2017 5:09 pm
Forum: General Science Questions
Replies: 1
Views: 439

Is there a page in the course reader that has all the formulas and constants?
Wed Jul 05, 2017 4:15 pm
Forum: DeBroglie Equation
Topic: self test 1: #3 part b
Replies: 3
Views: 317

### Re: self test 1: #3 part b

Could you type the full question please, and by the way, where can I find the self-test? The first part was Find the uncertainty in the position of a marble of mass 1.5g given that it's speed is known to be within +/- 0.55m/s^-1. For this I got >/= 3.2 x 10^-32 And you can find the self test in the...
Wed Jul 05, 2017 3:30 pm
Forum: DeBroglie Equation
Topic: self test 1: #3 part b
Replies: 3
Views: 317

### self test 1: #3 part b

If the speed of the marble is 3.5m/s what is its wavelength?

What would you plug in for the p in the formula, lambda=h/p?
Tue Jul 04, 2017 6:24 pm
Forum: Student Social/Study Group
Replies: 8
Views: 874

### Re: Self Test 1 Answers

Davalanya 1F wrote:Could you explain how you set up 1B? I think I'm overthinking the entire thing. Thanks!

You just multiply 250mL by .650 M and divide that by 2.00M. The M's will cancel out and leave you with about 81.3mL
Tue Jul 04, 2017 6:05 pm
Forum: Limiting Reactant Calculations
Topic: Self test question #2 [ENDORSED]
Replies: 1
Views: 225

### Self test question #2[ENDORSED]

After you balance the equation and find the limiting reactant, what is the next step?
Tue Jul 04, 2017 5:37 pm
Forum: Molarity, Solutions, Dilutions
Topic: Self Test:#1 part a
Replies: 1
Views: 172

### Self Test:#1 part a

How many grams of NaOH do you need to prepare a 3.00 x 10^2 mL stock solution of 2.00 M NaOH?

Is there a certain formula you have to use or do you just use conversion?
Mon Jul 03, 2017 10:08 pm
Forum: Student Social/Study Group
Topic: Exams/tests ?
Replies: 4
Views: 463

### Re: Exams/tests ?

The test will most likely have about 5 questions with several parts to them (a,b,c,etc.) and will be calculation-based word problems.
Mon Jul 03, 2017 10:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Self Test 1
Replies: 1
Views: 243

### Self Test 1

Is there an answer key to self test #1 in the course reader?
Sun Jul 02, 2017 4:44 pm
Forum: SI Units, Unit Conversions
Topic: Test 1 [ENDORSED]
Replies: 3
Views: 553

### Test 1[ENDORSED]

Does the first test only cover the fundamentals and chapter 1? or does it also cover chapter 2?
Fri Jun 30, 2017 9:46 pm
Forum: SI Units, Unit Conversions
Topic: Practice Tests?
Replies: 2
Views: 493

### Practice Tests?

Are there any other practice tests for the test next week other than the ones in the course reader?
Wed Jun 28, 2017 3:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Summer Bruincast
Replies: 6
Views: 606

### Re: Summer Bruincast

I dont think so, I checked on the bruincast website and it looks like theres only bruincasts fall-spring quarter.
Mon Jun 26, 2017 4:34 pm
Forum: SI Units, Unit Conversions
Topic: Exercise E1 [ENDORSED]
Replies: 6
Views: 822

### Exercise E1[ENDORSED]

For Exercise E1: 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 144pm, into one of these fibers by encapsulating them in carbon nanotubes. How long would the fib...