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- Sun Mar 17, 2019 6:46 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3998328
- Sun Mar 17, 2019 6:45 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3998328
- Sun Mar 17, 2019 6:44 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3998328
- Sun Mar 17, 2019 6:43 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3998328
- Sun Mar 17, 2019 6:43 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3998328
- Sun Mar 17, 2019 6:42 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3998328
- Sun Mar 17, 2019 6:42 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3998328
- Sun Mar 17, 2019 6:38 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3998328
- Sun Mar 17, 2019 6:36 pm
- Forum: General Science Questions
- Topic: SIG FIGS
- Replies: 5
- Views: 949
Re: SIG FIGS
It depends on what's given to you in the problem. If the probelm give you numbers with 3 sig figs, do three.
- Sun Mar 17, 2019 6:35 pm
- Forum: General Science Questions
- Topic: Rounding/ Significant Figures
- Replies: 3
- Views: 687
Re: Rounding/ Significant Figures
Lavelle does count sig figs in the final, but as far as the book, he has a list of book errors on his website.
- Sun Mar 17, 2019 6:33 pm
- Forum: General Science Questions
- Topic: sig figs
- Replies: 4
- Views: 818
Re: sig figs
I usually would do 3 sigs figs just to be safe.
- Sun Mar 17, 2019 6:32 pm
- Forum: General Science Questions
- Topic: Easy ways to remember
- Replies: 5
- Views: 845
Re: Easy ways to remember
I always remember "leo" for "lose electron: oxidation" and "lao" for "Left: anode: oxidation"
- Sun Mar 17, 2019 6:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lavelle's other classes
- Replies: 3
- Views: 713
Lavelle's other classes
Does Professor Lavelle teach any other courses at UCLA besides 14a and 14b? He was a wonderful and fun professor so I was curious if I'd have the opportunity to take his classes again.
- Sun Mar 17, 2019 6:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Picking up the Final
- Replies: 2
- Views: 533
Picking up the Final
What date next quarter will we be able to pick up our final, and where at?
- Sun Mar 17, 2019 6:28 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Grade Release Date?
- Replies: 7
- Views: 1014
Re: Final Grade Release Date?
For 14a he had them up a week after the final, so I'd say before the beginning of next week.
- Sat Mar 16, 2019 10:01 pm
- Forum: General Science Questions
- Topic: Math question
- Replies: 2
- Views: 495
Re: Math question
To get something out of a log, you use the base of the log for each side and raise to the power of each side of the equation. So for log base ten, you would make each side an exponent with base 10. For your example, you would get 10^(logx) = 10^8. Since the base and the log base are the same, evert...
- Sat Mar 16, 2019 9:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test Location 14B W19
- Replies: 3
- Views: 673
Re: Test Location 14B W19
If you're E, you'll be in Moore 100, which is by Kerckhoff patio.
- Sat Mar 16, 2019 9:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sig Figs
- Replies: 9
- Views: 1178
Re: Sig Figs
I haven't heard exactly but I would expect that they will be watching them since this is the final. Tbh just make sure you're not giving a 10 digit answer when it's using 2 digit numbers and you should be fine.
- Sat Mar 16, 2019 9:54 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Deadline to post
- Replies: 7
- Views: 818
Re: Deadline to post
Professor Lavelle said the deadline ends sunday.
- Sat Mar 16, 2019 9:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 18
- Views: 2123
Re: Final
The TAs said that the newer material will be more heavily emphasized but there will still be a portion of content on previous topics.
- Sat Mar 16, 2019 9:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final questions
- Replies: 1
- Views: 502
Final questions
How many questions will be on the final?
- Sat Mar 16, 2019 9:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Past Finals
- Replies: 4
- Views: 870
Re: Past Finals
UCLA's test bank has a few, but I personally didn't find them very useful. He's changed his curriculum around since the most recent one was posted.
- Sun Mar 10, 2019 2:51 pm
- Forum: General Science Questions
- Topic: Math question
- Replies: 2
- Views: 495
Math question
Okay, I've been having a complete brain fart because it's been so long since I dealt with simple log functions. When converting say log x = 8, how do you solve for x? I can't remember exactly whether you use e, or if its a simple exponential function.
- Sun Mar 10, 2019 2:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 averages
- Replies: 4
- Views: 587
Test 2 averages
My TA didn't calculate the Test 2 averages, but I was wondering if anyone else's TA told them the average from test 2?
- Sun Mar 10, 2019 2:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm average
- Replies: 5
- Views: 668
Midterm average
Does anyone remember what the average score was on the midterm? I remember him saying it in class but I didn't write it down.
- Sun Mar 03, 2019 4:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class Curve
- Replies: 11
- Views: 1804
Class Curve
I know there's no curve, but 50% is passing with a C-. How does the rest of the class grading balance out if a C- is 50%? is it 50-75% is a C- and then the rest, C-A+ follows a normal grading scale, or is it evened out to, say, 50-65% is a C scale, 66-80% is a B scale, etc etc?
- Sun Mar 03, 2019 4:33 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation number?
- Replies: 12
- Views: 7721
Oxidation number?
Professor Lavelle briefly mentioned in lecture about knowing the oxidation number based on an element's location on the periodic table? What was he referring to? I never learned that in high school.
- Sun Mar 03, 2019 4:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2 Scores
- Replies: 6
- Views: 618
Test 2 Scores
Does anyone know when we'll receive our scores for Test 2? My TA didn't say.
- Sun Feb 10, 2019 4:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 8
- Views: 947
Re: Midterm
Everything up to entropy will be on the midterm, so Gibbs free energy is where the content stops.
- Sun Feb 10, 2019 4:22 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: ICE
- Replies: 19
- Views: 1517
Re: ICE
E stands for equilibrium
- Sun Feb 10, 2019 4:19 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Decreasing volume and chemical equilibrium
- Replies: 8
- Views: 942
Re: Decreasing volume and chemical equilibrium
It will favor the side of the reaction with fewer moles.
- Wed Jan 30, 2019 6:16 pm
- Forum: Phase Changes & Related Calculations
- Topic: Test #1
- Replies: 11
- Views: 1000
Re: Test #1
We should be. I got mine in discussion today, but it depends on your TA.
- Wed Jan 30, 2019 6:15 pm
- Forum: Ideal Gases
- Topic: Chemistry Community Posting
- Replies: 7
- Views: 639
Re: Chemistry Community Posting
The cutoff is on Sunday, So just post them whenever you can :)
- Wed Jan 30, 2019 6:14 pm
- Forum: Ideal Gases
- Topic: Q and K
- Replies: 13
- Views: 1345
Re: Q and K
Since K is only for when it's at equilibrium, the value is only K IF it's at equilibrium. When it's not at equilibrium, it is Q.
- Thu Jan 10, 2019 11:20 am
- Forum: Ideal Gases
- Topic: Algebra
- Replies: 5
- Views: 348
Re: Algebra
P=(conc)RT becomes Conc=P/RT like this:
Becasue you want to get Conc alone, you divide both sides by RT. This makes RT cancel out on the side of concentration.
now you have Conc=P/RT
Becasue you want to get Conc alone, you divide both sides by RT. This makes RT cancel out on the side of concentration.
now you have Conc=P/RT
- Thu Jan 10, 2019 11:14 am
- Forum: Student Social/Study Group
- Topic: New to Lavelle
- Replies: 32
- Views: 5379
Re: New to Lavelle
practice the homework problems for sure and go to review sessions that the TAs hold! I also recommend personal tutoring, but it can take time to find one that you like that doesn't charge you $60 a session lol
- Thu Jan 10, 2019 11:12 am
- Forum: Ideal Gases
- Topic: Value of K
- Replies: 6
- Views: 1623
Re: Value of K
K is a ratio of Products/Reactants (to think about it algebraically, say Products=a and Reactants=b). If K=1, then that means a/b=1, meaning a=b. If K>1, then a has to be greater than b in order to make the ratio larger than one, and if K<1, b has to be greater than a to make the ratio smaller.
- Wed Dec 05, 2018 1:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class Grading 2
- Replies: 4
- Views: 538
Re: Class Grading 2
Thank you so much! Idk why I wasn't seeing that when I read it haha
- Wed Dec 05, 2018 12:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class Grading 2
- Replies: 4
- Views: 538
Class Grading 2
Okay so I want to double check that this is true:
I was told that even though there is no curve in this class, a passing grade (C-) is 50%, or essentially a 250/500. Is this true? I can't find it stated in the syllabus and ya girl is hyper stressing about this final, so I need to know. Thank you.
I was told that even though there is no curve in this class, a passing grade (C-) is 50%, or essentially a 250/500. Is this true? I can't find it stated in the syllabus and ya girl is hyper stressing about this final, so I need to know. Thank you.
- Tue Dec 04, 2018 11:53 am
- Forum: Administrative Questions and Class Announcements
- Topic: About the test
- Replies: 8
- Views: 1115
About the test
All the stuff prior to the most recent test last week... can we assume that if it hasn't been tested in the tests or midterm that it won't be on the final? Or is literally everything fair game?
- Tue Dec 04, 2018 11:50 am
- Forum: Lewis Structures
- Topic: Elements that break the octet rule
- Replies: 6
- Views: 856
Elements that break the octet rule
So I know that Br, I, and P can break the octet rule in lewis structures, but I read that there are other elements that can do this too, like Cl occasionally. Which elements are we required to know that break the octet rule for this class?
- Fri Nov 16, 2018 12:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs in Molecular Shape
- Replies: 4
- Views: 533
Lone Pairs in Molecular Shape
So I want to make sure I understand this correctly: a lone pair in a molecule acts as though it's an atom when in terms of repelling other atoms and the shape, correct? If no, what are examples of times it doesn't behave like this?
- Fri Nov 16, 2018 12:29 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 1
- Views: 293
Study Group
Would anyone be interested in creating a study group? Preferably we'd meet once or twice a week on the Hill to do HW together and help each other understand topics.
- Fri Nov 16, 2018 12:27 pm
- Forum: Student Social/Study Group
- Topic: midterm average
- Replies: 4
- Views: 548
Re: midterm average
The average was 83%! Pretty high tbh
- Fri Nov 16, 2018 11:07 am
- Forum: Student Social/Study Group
- Topic: curve?
- Replies: 20
- Views: 3063
Re: curve?
My understanding is that there is no curve, but there will probably be a grade adjustment based on the class average. A curve would prohibit say, the bottom 10% of the class from passing, but an adjustment allows the entire class the opportunity to pass, no matter their rank in grade.
- Mon Nov 05, 2018 3:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 6 HOmework
- Replies: 4
- Views: 400
Week 6 HOmework
Since we have a midterm tonight, is there homework due this week?
- Fri Nov 02, 2018 2:38 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: f- orbital
- Replies: 3
- Views: 504
f- orbital
So on the periodic table, the s-, p-, and d- orbitals all correspond with a block of the periodic table. But I've noticed that some random elements use the f- orbital and I can't seem to figure out what the telltale sign is that they do. What block/part of the periodic table corresponds to the f- or...
- Fri Nov 02, 2018 2:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Cheat sheet or open notes? [ENDORSED]
- Replies: 2
- Views: 540
Cheat sheet or open notes? [ENDORSED]
In my last chem class we were allowed to make a three page "Cheat sheet" for the midterm and I heard someone mention that this test was going to be open note (even though I never heard the professor or TAs say so). So will either of these things be allowed in the midterm?
- Fri Nov 02, 2018 2:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Scantron
- Replies: 6
- Views: 609
Scantron
Will we need a scantron for the midterm?
- Fri Oct 26, 2018 3:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: Calculating number of valence electrons in bonds
- Replies: 5
- Views: 2753
Calculating number of valence electrons in bonds
In class the professor went over lewis dot structures and did some sort of calculation to calculate how many valence electrons were needed for the diagram, but his explanation confused me. How do you calculate how many electrons to depict in the dot structure?
- Fri Oct 26, 2018 3:18 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Tricks to remembering orbitals
- Replies: 2
- Views: 724
Tricks to remembering orbitals
When I took Chem before, there was a trick involving the periodic table that could help you tell what orbital the valence electrons were in and what order to follow the orbitals for, but I can't remember it nor can I find it mentioned anywhere. Is there/what is the trick to remembering and figuring ...
- Fri Oct 26, 2018 3:15 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Meaning of Z
- Replies: 5
- Views: 602
Re: Meaning of Z
Yeah, Z is the atomic number in this case
- Thu Oct 18, 2018 12:14 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: What exactly are nodes?
- Replies: 1
- Views: 126
What exactly are nodes?
In class the professor was talking about different orbitals and whether or not they have nodes or nodal planes. I understand which orbitals have them, but I don't actually understand what they are or what having them means.
- Thu Oct 18, 2018 12:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class Grading
- Replies: 9
- Views: 1169
Class Grading
Will this class be graded on a curve like most STEM courses? I searched through the sylabus and didn't see anything about the grading scale, so I wanted to ask.
- Thu Oct 11, 2018 4:21 pm
- Forum: Empirical & Molecular Formulas
- Topic: Is it possible for the Empirical and Molecular formula to be the same? [ENDORSED]
- Replies: 8
- Views: 1305
Is it possible for the Empirical and Molecular formula to be the same? [ENDORSED]
So I came across a problem recently that no matter how hard I tried, I kept getting the same answer for both the Empirical and Molecular formula. Ive never seen that before so... is that possible?
- Thu Oct 11, 2018 4:18 pm
- Forum: Balancing Chemical Reactions
- Topic: Test 1 and Future Tests
- Replies: 5
- Views: 811
Test 1 and Future Tests
So for balancing chemical equations, how much work is required to be shown to get credit? Because the way I was taught to solve them in high school is kinda like doing Soduku puzzles and I basicaclly do it all in my head. I wouldn't even know where to begin with "Showing my work."
- Thu Oct 11, 2018 4:08 pm
- Forum: Balancing Chemical Reactions
- Topic: How To....
- Replies: 16
- Views: 2648
Re: How To....
You don't have to put the state of matter unless it asks you to, the way I understand it.
- Wed Oct 03, 2018 5:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading for Chemistry Community [ENDORSED]
- Replies: 6
- Views: 858
Grading for Chemistry Community [ENDORSED]
So I keep hearing different responses from different people and I can't seem to find the answer on the syllabus or website: Do we have to have 3 posts for credit per week, or 1? I was originally told 3 by a classmate, but then another classmate said we only need 1...
- Wed Oct 03, 2018 4:31 pm
- Forum: Significant Figures
- Topic: Do sig figs only refer to decimals?
- Replies: 3
- Views: 275
Do sig figs only refer to decimals?
So I'm a little confused... Do sig figs refer only to the number of figures after a decimal point (say 1.02), or do they refer to the whole number, before and after the decimal? So would, say, the number 1.02 have 2 sig figs, or 3?
- Wed Oct 03, 2018 4:27 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 3
- Views: 423
Re: Sig Figs
I think he might dock partial credit, but I doubt he'll significantly ding us. I took Chem 20a last year (long story) and my professor made no attempt to even teach us about sig figs or worry about it lol. Just try to be consistent.