Search found 40 matches

Sat Dec 08, 2018 10:16 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 11589

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

oh you still do subtract, you should have 1.04961466x10^-2 mol H+ and 5.24x10^-3 mol OH-, u subtract so you are left with 5.2497 x10^-3mol H+. Then you divide by 1L to get molarity (same number) then -log[H+], you should get a pH of 2.28
Sat Dec 08, 2018 9:50 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 11589

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

for number 34 you have to find the limiting reagent of the acid and base essentially. CaO dissociates to Ca2+ and O2-, and think of O2- + H2O -> 2OH- . So 1 mol CaO is equal to 2 mol OH-, maybe that's your error?
Sat Dec 08, 2018 9:47 pm
Forum: General Science Questions
Topic: Final Exam
Replies: 5
Views: 555

Re: Final Exam

yea boiling points are a characteristic of IMFs, stronger bonds mean a higher boiling point because they want to stick together more, so it's less likely to go from liquid to gas
Fri Dec 07, 2018 1:14 am
Forum: General Science Questions
Topic: how to draw a double bond that is coming at you
Replies: 6
Views: 399

Re: how to draw a double bond that is coming at you

yea I don't think this is necessary, most of the time you are drawing lewis structures which are 2d, then stating the 3d shape and molecular geometry
Fri Dec 07, 2018 1:11 am
Forum: Administrative Questions and Class Announcements
Topic: Final Topics
Replies: 3
Views: 264

Re: Final Topics

It is cumulative, and will probably break into a question for each topic/section with each question having (a,b,c, etc.)
Fri Dec 07, 2018 1:09 am
Forum: General Science Questions
Topic: naming coordination compounds
Replies: 2
Views: 194

Re: naming coordination compounds

is it not in alphabetical order?
Fri Dec 07, 2018 1:08 am
Forum: General Science Questions
Topic: Final Exam
Replies: 5
Views: 555

Re: Final Exam

It is cumulative, so it will probably be a question from each section/topic, but each question has multiple subsections (a,b,c, etc.)
Thu Nov 29, 2018 12:55 am
Forum: Administrative Questions and Class Announcements
Topic: Test 3
Replies: 2
Views: 213

Re: Test 3

For hybridization, you should know everything to the octahedral shape. I would recommend doing the practice homework questions Lavelle posted on his website.
Thu Nov 29, 2018 12:53 am
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 11
Views: 572

Re: Final

The final is probably accumulative, but it would be best to study problems on the newer information like acids and bases and coordination compounds. The rest is review from the past lectures
Thu Nov 29, 2018 12:50 am
Forum: Student Social/Study Group
Topic: Test 3
Replies: 6
Views: 608

Re: Test 3

It isn't testing coordination compounds and ligands, but the stuff from the midterm onwards, like VSEPR, shapes, hybridization, etc.
Thu Nov 29, 2018 12:48 am
Forum: Student Social/Study Group
Topic: Final
Replies: 12
Views: 971

Re: Final

It is accumalative I believe, but I would guess it has more problems on the newer information we are learning, like acid and bases, and coordination compounds
Thu Nov 29, 2018 12:45 am
Forum: Hybridization
Topic: pi bonds
Replies: 5
Views: 238

Re: pi bonds

pi bonds don't count for hybridization, and are in the p-block with the appropriate period
Fri Nov 16, 2018 12:21 am
Forum: Administrative Questions and Class Announcements
Topic: 14B Co-Requisites
Replies: 4
Views: 293

Re: 14B Co-Requisites

Yea I am in the same situation as you because I took chem14a and ls7a this quarter, and you need ls30a for chem14b. I am taking ls30a winter quarter to fulfill the prerequisite, and am going to take chem14b spring quarter.
Fri Nov 16, 2018 12:18 am
Forum: Administrative Questions and Class Announcements
Topic: Homework Due Week 7
Replies: 10
Views: 644

Re: Homework Due Week 7

I think you can do any problems up to 2e/ 2f, but homework is ultimately to help you so it's probably fine to do problems that might not be on the outline, but will help you learn the material
Fri Nov 16, 2018 12:16 am
Forum: Administrative Questions and Class Announcements
Topic: Octet Rule
Replies: 6
Views: 397

Re: Octet Rule

I would say formal charges are more important at period 3 and on, as they can use the d-block for electrons. Also, group 13 are exceptions you have to look out for, as well as hydrogen, helium, lithium, and beryllium as they can't get to 8 and are fine with 2 for a full shell. The octet rule is stil...
Fri Nov 16, 2018 12:13 am
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Wednesday Class
Replies: 19
Views: 651

Re: Thanksgiving Wednesday Class

He said in class its a TBA, we probably will know by monday of next week if we are behind/ahead of schedule.
Fri Nov 09, 2018 1:16 am
Forum: Administrative Questions and Class Announcements
Topic: Which chapters can we do for homework?
Replies: 3
Views: 241

Re: Which chapters can we do for homework?

Yea, that’s what I did, and I did the problems on chemical bonds/polarizability and bond length
Fri Nov 09, 2018 1:13 am
Forum: Student Social/Study Group
Topic: Sig Figs on Midterm
Replies: 13
Views: 871

Re: Sig Figs on Midterm

As the other people said, I think sigfigs were important but it might depend on youre TA. I believe on the test it said to do sigfigs though.
Fri Nov 09, 2018 1:12 am
Forum: General Science Questions
Topic: Chemistry Community Posts
Replies: 8
Views: 688

Re: Chemistry Community Posts

You have to post or reply 3 times a week before sunday I think. They don’t roll over as well
Sun Nov 04, 2018 11:05 pm
Forum: Student Social/Study Group
Replies: 3
Views: 196

a radical is when a molecule has an unpaired electron, it will have an odd number of valence electrons
Fri Nov 02, 2018 10:15 am
Forum: Formal Charge and Oxidation Numbers
Topic: Finding the lowest energy structure
Replies: 5
Views: 282

Re: Finding the lowest energy structure

You have to test it because some lewis structures are more stable than others and the formal charge shows this stability in number terms. There are also resonance structures, but they are all the same in terms of formal charge and stability.
Fri Nov 02, 2018 10:09 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge and the Octet Rule
Replies: 6
Views: 345

Re: Formal Charge and the Octet Rule

The octet rule can be broken for the 3 sub shells as they have s,p, and d. That means their lewis structures can have more than 4 bonds or more than 8 electrons, and Lavelle showed some examples during lecture.
Fri Nov 02, 2018 10:07 am
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of Ions
Replies: 9
Views: 434

Re: Formal Charge of Ions

I believe if you add up all the formal charges, you get the charge of the overall compound/ion. Each individual atom can have a different charge
Thu Oct 25, 2018 5:18 pm
Forum: Student Social/Study Group
Topic: Studying for tests/midterm
Replies: 18
Views: 1574

Re: Studying for tests/midterm

I do homework/ practice problems and UA peer sessions
Mon Oct 22, 2018 6:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration for elements > Z = 56
Replies: 3
Views: 246

Re: Electron configuration for elements > Z = 56

It would be the first one, and it goes f, d,s,p. You don't need to know that though because you only need to know up to the first d-block.
Mon Oct 22, 2018 6:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Discussion Notes (3A/3I/3K)
Replies: 3
Views: 361

Re: Week 3 Discussion Notes (3A/3I/3K)

Fri Oct 19, 2018 12:28 am
Forum: DeBroglie Equation
Topic: Momentum and Wavelike Properties
Replies: 2
Views: 153

Re: Momentum and Wavelike Properties

Everything has wavelike properties, it is just if it is too big then it is too small to be detected. Lavelle did this by using the de Broglie equation with a car, but the wavelength was too small to detect. It is noticeable in particles because they are small, so the wavelength properties are more a...
Fri Oct 19, 2018 12:26 am
Forum: DeBroglie Equation
Topic: Energy=pc
Replies: 4
Views: 261

Re: Energy=pc

KE= 1/2 mv^2, it is only velocity squared, not m. energy would not equal 1/2 pc, as p=mv. It isn't (mv)^2.
Mon Oct 15, 2018 10:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Required knowledge for test/midterm [ENDORSED]
Replies: 17
Views: 646

Re: Required knowledge for test/midterm[ENDORSED]

I am pretty sure the formulas and constants are on a formula sheet in the front like the first test, so you should focus on being able to solve the questions. However, you should also be comfortable with all the numbers and understand all the equations and what the constants are.
Mon Oct 15, 2018 10:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Writing in Pen
Replies: 13
Views: 620

Re: Writing in Pen

Mon Oct 15, 2018 10:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to find assignments
Replies: 5
Views: 217

Re: Where to find assignments

I just choose 7 questions on the syllabus that are relevant/ covered over the week and turn them in discussion
Thu Oct 11, 2018 12:01 am
Forum: Student Social/Study Group
Topic: Percent Composition
Replies: 3
Views: 684

Re: Percent Composition

I am pretty sure it is miniscule enough to count as 100%, so the calculation shouldn't change much. However, if it doesn't add up you should look at the reaction and see what could be lost, like oxygen in oxygen gas.
Tue Oct 09, 2018 11:51 pm
Forum: Administrative Questions and Class Announcements
Replies: 135
Views: 31729

thank you for the extra practice, it's similar to lyndon's
Tue Oct 09, 2018 11:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Number of questions on test one [ENDORSED]
Replies: 39
Views: 18692

Re: Number of questions on test one[ENDORSED]

Yea it is 8 questions, probably with subsections as you get 40 minutes for it, and it is worth 40 points
Tue Oct 09, 2018 11:47 pm
Forum: General Science Questions
Topic: Official version of periodic table?
Replies: 2
Views: 159

Re: Official version of periodic table?

Yea I couldn't find it, but for the test and stuff it will be provided, so you just use those numbers. For homework I just use one online, but it might not be the same
Thu Oct 04, 2018 5:35 pm
Forum: Balancing Chemical Reactions
Topic: 7th Edition L.35 question
Replies: 3
Views: 209

7th Edition L.35 question

I have a question on L.35 because the question and the answer in the solutions manual seem to be different. I tried balancing the equation FeBr2 + Na2CO3 -> NaBr + CO2 + Fe3O4, but it seemed difficult so I checked the solutions manual. However, the answer key has it balanced as Fe3Br8 + 4 Na2CO3 -> ...
Wed Oct 03, 2018 8:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Type of calculator
Replies: 8
Views: 472

Re: Type of calculator

Jayde Felix 4H wrote:I'm sure that one is fine! I am using the TI-36X Pro, and my roommate took this class last year and she said that it's okay.

ok, thanks!
Wed Oct 03, 2018 7:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Type of calculator
Replies: 8
Views: 472

Type of calculator

I am trying to purchase a non-programmable, non-graphing calculator and want to double-check if this one is okay: https://www.amazon.com/Texas-Instruments-Scientific-Calculator-Accents/dp/B00000JBNX/ref=sr_1_5?s=office-electronics&ie=UTF8&qid=1538621090&sr=1-5&keywords=calculator I d...
Wed Oct 03, 2018 7:43 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading for Chemistry Community [ENDORSED]
Replies: 6
Views: 434