Search found 100 matches
- Fri Mar 12, 2021 8:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 576312
Re: Saying Thank You to Dr. Lavelle
Thank you so much Dr. Lavelle! Fall and Winter quarter were great and I learned so much!
- Sun Mar 07, 2021 2:16 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: balancing charges in 6L1 part b
- Replies: 4
- Views: 341
Re: balancing charges in 6L1 part b
You have to look at the oxidation numbers and how much they change! That's why it's 6!
- Sun Mar 07, 2021 2:14 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: E vs E naught
- Replies: 36
- Views: 1734
Re: E vs E naught
E naught is at standard conditions!
- Sun Mar 07, 2021 2:12 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: What was your favorite chem topic?
- Replies: 137
- Views: 11591
Re: What was your favorite chem topic?
Chemical Equilibrium was my favorite and thermodynamics were my least favorite.
- Sun Mar 07, 2021 2:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final on 3/13
- Replies: 18
- Views: 939
Re: Final on 3/13
The final is on Sunday instead of Saturday!
- Sun Mar 07, 2021 2:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: week 10 lectures?
- Replies: 15
- Views: 947
Re: week 10 lectures?
Last quarter I believe that the last lecture was the review? I'm not sure though!
- Sun Mar 07, 2021 2:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Time
- Replies: 47
- Views: 2587
Re: Final Exam Time
Is the final exam time the same for everyone?
- Sun Feb 28, 2021 6:36 pm
- Forum: Student Social/Study Group
- Topic: Moving to Westwood soon. Which restaurants should I visit?
- Replies: 45
- Views: 3044
Moving to Westwood soon. Which restaurants should I visit?
Like in the title! Looking for restaurant/boba/dessert places to try when I move!
- Sun Feb 28, 2021 6:33 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode and mass
- Replies: 6
- Views: 389
Re: Anode and mass
You have to write the half-reactions. For example, when there is a reduction half-reaction with Ag+, it will add an electron then become Ag(s). Which would be a solid that adheres to the metal.
- Sun Feb 28, 2021 6:32 pm
- Forum: Student Social/Study Group
- Topic: Book Recommendations
- Replies: 135
- Views: 15958
Re: Book Recommendations
I really recommend Pachinko by Min Jin Lee!
- Sun Feb 28, 2021 6:32 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: E naught = 0
- Replies: 13
- Views: 2015
Re: E naught = 0
Yes because in standard conditions there are standard concentrations!
- Sun Feb 28, 2021 6:31 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 381717
Re: Final Jitters
I think reviewing the old material and doing the new practice problems will help with confidence as well as going to office hours!
- Sun Feb 28, 2021 6:30 pm
- Forum: Student Social/Study Group
- Topic: Fave food
- Replies: 266
- Views: 41706
Re: Fave food
my fave food would probably be sushi!
- Sun Feb 21, 2021 9:31 pm
- Forum: Student Social/Study Group
- Topic: Points needed to pass?
- Replies: 76
- Views: 8485
Re: Points needed to pass?
I believe it's 50% and the class is out of 400 so it would be 200 points.
- Sun Feb 21, 2021 9:29 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 11
- Views: 763
Re: Van't Hoff Equation
To take the ln out, you raise everything with a base e on both sides. Hope this helps!
- Sun Feb 21, 2021 9:27 pm
- Forum: Student Social/Study Group
- Topic: Classes for next quarter?
- Replies: 165
- Views: 17377
Re: Classes for next quarter?
I'm taking LS7B, I didn't get 14C or 14BL :( my pass was too late but I'm taking psych 10, ls40, and a ge instead.
- Sun Feb 21, 2021 9:07 pm
- Forum: Student Social/Study Group
- Topic: Post Midterm 2 De-stressing
- Replies: 92
- Views: 7660
Re: Post Midterm 2 De-stressing
sleep and not think about thermodynamics and work LOL
- Sun Feb 21, 2021 9:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 48
- Views: 2976
Re: Final
I believe its cumulative so I think the best thing to do is start studying the earlier material as soon as possible! You got this!
- Wed Feb 17, 2021 8:24 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: The Difference Between deltaH° and q
- Replies: 2
- Views: 168
The Difference Between deltaH° and q
In the textbook problem 4D.11, I'm a little confused about what they are asking for. They just give the delta H° of the reaction and ask for heat absorbed. I associate heat absorbed or heat in general with q, but in this case they are equal to delta H°. Does deltaH° imply constant volume or pressure...
- Sun Feb 14, 2021 9:54 pm
- Forum: Calculating Work of Expansion
- Topic: U, q, w
- Replies: 11
- Views: 879
Re: U, q, w
Internal energy = q + w. But remember the conditions (like when the volume is constant) when it is simplified!
- Sun Feb 14, 2021 9:53 pm
- Forum: Calculating Work of Expansion
- Topic: Work Done on System?
- Replies: 12
- Views: 605
Re: Work Done on System?
When work is being done on the system it should be when the gas is being compressed and the work value would be positive with respect to the system.
- Sun Feb 14, 2021 9:51 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Determining the Sign of S
- Replies: 8
- Views: 471
Re: Determining the Sign of S
From my experience, it is determined by the values found by calculating the equation!
- Sun Feb 14, 2021 6:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: struggling
- Replies: 73
- Views: 4105
Re: struggling
Maybe also watch some youtube videos to better understand concepts and problems! That definitely helps me a lot! Also, you should do the UA review worksheets they are really good to go over before an exam. Also, when I go through the textbook questions I circle the ones that are difficult and after ...
- Sun Feb 14, 2021 6:46 pm
- Forum: Student Social/Study Group
- Topic: Fav Shows of the Moment
- Replies: 115
- Views: 49235
Re: Fav Shows of the Moment
I'm currently watching attack on titan and brooklyn 99!
- Sun Feb 14, 2021 6:45 pm
- Forum: Calculating Work of Expansion
- Topic: irreversible vs reversible
- Replies: 14
- Views: 735
Re: irreversible vs reversible
It should definitely say directly, but if it's indirect, timing is key, and also diagrams should help if you try to illustrate the scenario!
- Sun Feb 07, 2021 11:55 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Tips for what gas constant to use
- Replies: 10
- Views: 690
Re: Tips for what gas constant to use
You can look at the units for each different R and match it to your problem!
- Wed Feb 03, 2021 7:49 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Biological Reactions
- Replies: 3
- Views: 159
Re: Biological Reactions
Going back to equilibrium, we can see that K value changes by changing temperature. But if you look at a biological system, for example yourself, elevating your internal temperature would cause your cells to die. You can also think about it in terms of another thing that makes biological systems pro...
- Wed Feb 03, 2021 7:45 pm
- Forum: Calculating Work of Expansion
- Topic: Spontaneous
- Replies: 26
- Views: 1583
Re: Spontaneous
Spontaneity relies on whether the gibbs free energy of a reaction is negative. In simple terms, this means that the reaction is favored to proceed in the fowards direction. I hope this helps!
- Sun Jan 31, 2021 10:32 pm
- Forum: Student Social/Study Group
- Topic: Go treat yourself after MT1!
- Replies: 75
- Views: 5619
Re: Go treat yourself after MT1!
I have other midterms to study for :( but after the midterm I got to take a break and watch some Netflix lol
- Sun Jan 31, 2021 10:31 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solving for Heterogeneous Equilibria
- Replies: 4
- Views: 243
Re: Solving for Heterogeneous Equilibria
You're 100% correct!
- Sun Jan 31, 2021 10:31 pm
- Forum: Student Social/Study Group
- Topic: Midterm 1
- Replies: 10
- Views: 408
Re: Midterm 1
You got this everyone! I believe in us! Hopefully the class average is 100% lol
- Sun Jan 31, 2021 10:30 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Would an aq agent be included in K?
- Replies: 27
- Views: 1076
Re: Would an aq agent be included in K?
Yes! I think of this in terms of concentration. Can you measure a concentration of a pure liquid or solid? No.
- Sun Jan 31, 2021 10:29 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Solving for Cubic Equations
- Replies: 13
- Views: 1153
Re: Solving for Cubic Equations
I believe Dr. Lavelle said we are only sticking to quadratic equations right now. But make sure to double check the K value! This would give away when you can make the assumption.
- Sun Jan 31, 2021 10:28 pm
- Forum: General Science Questions
- Topic: Midterm 1 Reactions
- Replies: 70
- Views: 5120
Re: Midterm 1 Reactions
Giving good vibes to everyone who replied! Good or bad we tried our hardest :)
- Mon Jan 25, 2021 12:10 am
- Forum: General Science Questions
- Topic: Study Tips for midterm
- Replies: 24
- Views: 1533
Re: Study Tips for midterm
I usually do the UA worksheets and review past textbook problems I found difficult or do the unassigned ones from the book.
- Sun Jan 24, 2021 8:46 pm
- Forum: Student Social/Study Group
- Topic: How are you?
- Replies: 154
- Views: 15250
Re: How are you?
scared for the midterm
- Sun Jan 24, 2021 7:51 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quadratics when assumption can't be used
- Replies: 5
- Views: 250
Re: Quadratics when assumption can't be used
Hi all! I found my error! Sorry for being vague. I left a negative sign out out my c value!
- Sun Jan 24, 2021 7:40 pm
- Forum: Student Social/Study Group
- Topic: Logistics for the Midterm
- Replies: 11
- Views: 757
Re: Logistics for the Midterm
Thanks all for replying! I think I get how it will go on test day now!
- Sun Jan 24, 2021 7:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Quadratics when assumption can't be used
- Replies: 5
- Views: 250
Quadratics when assumption can't be used
In the sapling homework, there are some problems that necessitate the quadratic equation and are close to the assumption. When I tried to use the quadratic equation, however, the discriminant was negative and I couldn't compute the square root. What am I doing wrong here? For reference: Sapling Prob...
- Sun Jan 17, 2021 10:38 pm
- Forum: Student Social/Study Group
- Topic: Logistics for the Midterm
- Replies: 11
- Views: 757
Logistics for the Midterm
Hi I was wondering if the midterm will be held similarly to how exams were held in Chem 14A. In the syllabus it says we are taking them during our lecture times, so will there be zoom proctoring by our TA's still? I'm sorry if this has been addressed already! Thank you!
- Sun Jan 17, 2021 10:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: cancelling out variables in K eq
- Replies: 4
- Views: 308
Re: cancelling out variables in K eq
Remember in this problem as well the mole ratios aren't all 1 so there should be an x^2!
- Sun Jan 17, 2021 10:34 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Making the Assumption that Change x is Small
- Replies: 4
- Views: 270
Re: Making the Assumption that Change x is Small
10^-3! But in Dr. Lavelle's Friday lecture, he talks about this is more detail concerning the flexibility of that value and how we can double check when it comes to % ionization!
- Sun Jan 17, 2021 10:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Total pressure calculation
- Replies: 8
- Views: 1187
Re: Total pressure calculation
Adding all partial pressures gives way for total pressure in a system!
- Sun Jan 17, 2021 10:32 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: When would K be unchanged?
- Replies: 31
- Views: 1228
Re: When would K be unchanged?
K would change when the temperature changes. I believe the 6/7 sapling problems tackle this.
- Sun Jan 10, 2021 2:02 pm
- Forum: Student Social/Study Group
- Topic: New Year Resolutions?
- Replies: 54
- Views: 3098
Re: New Year Resolutions?
I want to exercise more! I've been very sedentary recently so I want to go outside and run more for instance.
- Sun Jan 10, 2021 2:01 pm
- Forum: Student Social/Study Group
- Topic: Advice for someone who didn't take 14A with professor Lavelle
- Replies: 61
- Views: 3139
Re: Advice for someone who didn't take 14A with professor Lavelle
Remember that this course is very individualistic so keep up with the assigned problems, lectures, and study sessions because it's really easy to fall behind.
- Sun Jan 10, 2021 1:57 pm
- Forum: Ideal Gases
- Topic: inert gas and pressure changes
- Replies: 9
- Views: 397
Re: inert gas and pressure changes
It doesn't change the volume which means it doesn't change the concentration.
- Sun Jan 10, 2021 12:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: I in ICE Chart
- Replies: 11
- Views: 494
Re: I in ICE Chart
Yes! For example in a decomposition reaction this would be the case!
- Sun Jan 10, 2021 12:36 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Changing volume
- Replies: 6
- Views: 364
Re: Changing volume
The "quickway" is just showing that you determine the way it shifts when the pressure changes the volume by looking at the number of moles. For example, if you double the pressure (halve the volume) it would go to the side with fewer moles.
- Mon Dec 14, 2020 10:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 576312
Re: Saying Thank You to Dr. Lavelle
Hi Dr. Lavelle,
Thank you for being a great professor for my first quarter at UCLA! I can't wait for more next quarter!
Thank you for being a great professor for my first quarter at UCLA! I can't wait for more next quarter!
- Fri Dec 11, 2020 12:12 am
- Forum: Amphoteric Compounds
- Topic: Amphoteric
- Replies: 8
- Views: 607
Re: Amphoteric
I'm pretty sure amphoteric compounds react depending on the molecules around them and since water is relatively neutral it would be hard to tell. I don't think it will be asked!
- Fri Dec 11, 2020 12:11 am
- Forum: Bronsted Acids & Bases
- Topic: HClO3 Strong Acid
- Replies: 4
- Views: 580
Re: HClO3 Strong Acid
It really depends. When I was in AP chem, my teacher told us to only think of a few acids as strong acids and all others as weak, but I don't know if that's entirely accurate!
- Fri Dec 11, 2020 12:08 am
- Forum: Photoelectric Effect
- Topic: Wednesday Review
- Replies: 1
- Views: 297
Re: Wednesday Review
If you didn't know b was inherently incorrect you can use the process of elimination! For a, when you have higher intensity let's say a brighter light, it doesn't affect the frequency of the resulting kinetic energy. For C, it is saying that kinetic energy and frequency are proportional which they a...
- Mon Dec 07, 2020 12:43 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3665353
Re: Post All Chemistry Jokes Here
what is an iron-deficient female?
just a male
just a male
- Sun Dec 06, 2020 12:02 am
- Forum: Student Social/Study Group
- Topic: Point distribution
- Replies: 11
- Views: 701
Re: Point distribution
I feel the same way! But it puts him in a hard position because it seems like many are doing well which would make a curve very small to nonexistent :(
- Sun Dec 06, 2020 12:00 am
- Forum: Student Social/Study Group
- Topic: How are you?
- Replies: 154
- Views: 15250
Re: How are you?
i'm catching up on lectures! so basically tired lol
Re: en
Specific to week 9's homework, it's a bidentate ligand which would mean the coordination number would be different!
- Sat Dec 05, 2020 11:57 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.1 Difference in pH
- Replies: 1
- Views: 101
Re: 6B.1 Difference in pH
I assume because you are assuming the HCL molar concentration was at 100% which would dissociate and give you 100% dissociation of hydronium ions needed to find pH . After dilution, this would be 12% of that value which means that you can take that 100% of dissociation and convert it to a 12 percent...
- Mon Nov 30, 2020 12:01 am
- Forum: Student Social/Study Group
- Topic: Grading Scale for Chem14A
- Replies: 29
- Views: 1679
Re: Grading Scale for Chem14A
I believe that 90% should be the cutoff for receiving an A of any kind. But in some classes I took in the past they curved the final grades so that there could be a specific percentage of students with an A and a B and so forth. But I'm not sure how he's going to go about that. I also agree that 90...
- Mon Nov 30, 2020 12:00 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3665353
Re: Post All Chemistry Jokes Here
Do you like chemistry?
Na
Na
- Wed Nov 25, 2020 8:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent Shape NonPolar
- Replies: 2
- Views: 186
Re: Bent Shape NonPolar
The bent shape can mean different things! If you look up a chart of all the molecular geometries bent can be used for different electron domain geometries. However, in all of those instances, the molecule would be polar to my knowledge because of the lone pairs. The lone pairs make it so that there ...
- Wed Nov 25, 2020 8:37 pm
- Forum: Student Social/Study Group
- Topic: Finals!
- Replies: 43
- Views: 2084
Re: Finals!
Thank you all for all the responses! I'll definitely study everything then!
- Sat Nov 21, 2020 6:41 pm
- Forum: Hybridization
- Topic: Double bonds structures
- Replies: 5
- Views: 319
Re: Double bonds structures
Hi! I had a question about something Dr. Lavelle mentioned in lecture, that if an atom has a double bond, then it cannot move around and it is locked into a position by these bonds. I was wondering how this applies to structures with resonance and if the electrons are delocalized? Thanks! Hi! A dou...
- Sat Nov 21, 2020 6:39 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Strongest/weakest intermolecular forces
- Replies: 6
- Views: 438
Re: Strongest/weakest intermolecular forces
Anna Martin 2l wrote:Could covalent bonds be a part of this list?
Covalent bonds are intrAmolecular forces! That exist within the molecule!
- Sat Nov 21, 2020 6:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: double bonding
- Replies: 8
- Views: 574
Re: double bonding
Like said above, the molecular geometry really depends on the electron domain geometry which includes lone pairs and bonds. If you look up a chart with the different electron domain geometries with their molecular geometry I think it will make more sense! Hope this helps!
- Sat Nov 21, 2020 6:34 pm
- Forum: Student Social/Study Group
- Topic: Grading Scale for Chem14A
- Replies: 29
- Views: 1679
Re: Grading Scale for Chem14A
I'm not exactly sure, I mostly try to estimate my grade based on the points I'm receiving (like getting points for chemistry community, the hw, etc). And then based on how my midterms go, I try to see what range I'm in (like whether I'm passing or not lol). I don't think Lavelle has specifically sa...
- Sat Nov 21, 2020 6:33 pm
- Forum: Student Social/Study Group
- Topic: Finals!
- Replies: 43
- Views: 2084
Finals!
Hi Everyone,
I'm not sure if Dr. Lavelle has addressed this already, but is the final exam cumulative, or does it only cover new material? Thanks!
I'm not sure if Dr. Lavelle has addressed this already, but is the final exam cumulative, or does it only cover new material? Thanks!
- Wed Nov 18, 2020 11:12 am
- Forum: Student Social/Study Group
- Topic: Grading Scale for Chem14A
- Replies: 29
- Views: 1679
Grading Scale for Chem14A
Hi everyone,
I was wondering what the exact grade scale for this class is in terms of percentages. Like for instance is an A a 94% or 93%? Thanks!
I was wondering what the exact grade scale for this class is in terms of percentages. Like for instance is an A a 94% or 93%? Thanks!
- Sat Nov 14, 2020 4:48 pm
- Forum: Lewis Structures
- Topic: Outline 3 Sheet Question
- Replies: 3
- Views: 201
Re: Outline 3 Sheet Question
There are also different notations for double or triple bonds. See a molecule of benzene for more information. Hope this helps!
- Sat Nov 14, 2020 4:45 pm
- Forum: Student Social/Study Group
- Topic: Drawing Lewis Structures
- Replies: 4
- Views: 198
Drawing Lewis Structures
I'm confused about how we are going to draw the lewis structures if the test is online. Are we uploading pictures of our drawings? Sorry if this is has already been answered. Thank you!
- Sat Nov 14, 2020 4:43 pm
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 4
- Views: 372
Re: Study Group
I would also like to join if there was a study group made!
- Fri Nov 13, 2020 11:34 pm
- Forum: Dipole Moments
- Topic: H-Bonds
- Replies: 14
- Views: 844
Re: H-Bonds
Only molecules with H attached to electronegative atoms, such as N, O, and F can hydrogen bond. Yes this is exactly true! Hydrogen bonds are intermolecular forces like said in this example and are the strongest INTERmolecular force. The hydrogen bonds within a water molecule for instance is not the...
- Fri Nov 13, 2020 11:32 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: is it polar
- Replies: 6
- Views: 538
Re: is it polar
To see if there is a dipole moment, you look at the elements electronegativity and you subtract the bonded elements electronegativities and the difference allows you to know the nature of their interaction: dipole, nonpolar, etc.
- Wed Nov 04, 2020 4:44 pm
- Forum: Ionic & Covalent Bonds
- Topic: Textbook Problem 2A.1
- Replies: 4
- Views: 153
Re: Textbook Problem 2A.1
I believe that even though d is a lower energy level it still has them as valence electrons because the shell is incomplete. I might be wrong! Hope this helps.
- Wed Nov 04, 2020 4:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2 paired electrons
- Replies: 3
- Views: 117
Re: 2 paired electrons
Use hund's rule! This is the diagram with the arrows and boxes to denote orbitals and electron spin! Hope this helps!
- Wed Nov 04, 2020 4:40 pm
- Forum: Lewis Structures
- Topic: Valence Electrons
- Replies: 10
- Views: 437
Re: Valence Electrons
Some tricks I use for finding valence electrons are looking at the electron configuration and seeing which electrons are in the highest energy level and which have incomplete shells, checking that with the element's point on the periodic table, and finally checking that with the electron domain geom...
- Sun Nov 01, 2020 11:43 pm
- Forum: Photoelectric Effect
- Topic: sapling #22
- Replies: 2
- Views: 277
Re: sapling #22
Use the kinetic energy equation and de Broglie equation to find the velocity!
- Sun Nov 01, 2020 11:41 pm
- Forum: Trends in The Periodic Table
- Topic: studying
- Replies: 12
- Views: 466
Re: studying
When I watched the lectures I took really thorough notes and I did all the practice problems and the UA worksheets! I'm not sure how I faired yet, but that's what has worked for me.
- Sun Nov 01, 2020 11:29 pm
- Forum: Properties of Light
- Topic: Amplitude and Intensity Relationship
- Replies: 4
- Views: 307
Re: Amplitude and Intensity Relationship
There is a proportional relationship between amplitude and intensity in terms of light.
- Sun Nov 01, 2020 11:23 pm
- Forum: Trends in The Periodic Table
- Topic: Oxygen vs Nitrogen and Fluorine
- Replies: 4
- Views: 342
Re: Oxygen vs Nitrogen and Fluorine
This is a special phenomenon! It's because the half shell of the p shape is 3 and atoms like to be in full or half-shells. So it would want to get rid of one electron more!
- Sun Nov 01, 2020 11:19 pm
- Forum: Student Social/Study Group
- Topic: Test Scored for Midterm 1
- Replies: 49
- Views: 2340
Re: Test Scored for Midterm 1
Are all the tests the same? Because I thought I had a mistake on my version. Let me know if anyone saw this!
- Sun Nov 01, 2020 11:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Participation Points [ENDORSED]
- Replies: 62
- Views: 3902
Re: Participation Points [ENDORSED]
What is the day/time in PST when participation is counted? Thank you!
- Sun Nov 01, 2020 11:14 pm
- Forum: Properties of Light
- Topic: How to remember what v is in equations
- Replies: 46
- Views: 7453
Re: How to remember what v is in equations
Use the equation sheet!
- Tue Oct 27, 2020 12:01 am
- Forum: Student Social/Study Group
- Topic: Midterm scratch paper
- Replies: 9
- Views: 447
Re: Midterm scratch paper
thank you to everyone who answered my post I really appreciate the help!
- Sat Oct 24, 2020 10:37 pm
- Forum: Student Social/Study Group
- Topic: Midterm scratch paper
- Replies: 9
- Views: 447
Midterm scratch paper
Hi!
I was wondering if we will have to turn in our scratch paper for the midterm and if we have to show our work for each problem. Thanks!
I was wondering if we will have to turn in our scratch paper for the midterm and if we have to show our work for each problem. Thanks!
- Sat Oct 24, 2020 9:51 pm
- Forum: Student Social/Study Group
- Topic: How to relax
- Replies: 168
- Views: 28835
Re: How to relax
I usually watch Netflix, read a book, take a nap, hang out with my dogs, or go on a walk! Usually, time away from the screens are the most relaxing for me.
- Sat Oct 24, 2020 9:50 pm
- Forum: Student Social/Study Group
- Topic: Constants and Equation Sheet
- Replies: 3
- Views: 167
Re: Constants and Equation Sheet
Yes in his most recent email he sent two links: one to a periodic table and one to a formula sheet that need to printed by the exam. I'm not sure if they're the same on the website, but possibly! Hope this helps!
- Sat Oct 24, 2020 9:48 pm
- Forum: Balancing Chemical Reactions
- Topic: L.39 Fundamental Question
- Replies: 3
- Views: 341
Re: L.39 Fundamental Question
Yes I agree that the oxygen in the air is the same as oxygen gas. Naturally, oxygen appears in a pair just like H, N, Cl, Br, etc. Hope this helps!
- Sat Oct 24, 2020 9:46 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Multi-Electron Atoms
- Replies: 3
- Views: 178
Re: Multi-Electron Atoms
There are other factors that affect electrostatic potential energy including the shielding effect by the inner energy levels since the electrons repel the other electrons. They also repel those in the same energy level.
- Sat Oct 24, 2020 9:43 pm
- Forum: Student Social/Study Group
- Topic: Midterm Question
- Replies: 9
- Views: 535
Re: Midterm Question
I think Dr. Lavelle sent an email regarding this question! He attached a periodic table and a constant/equation sheet that we need to be printed before the exam. I hope this helps!
- Fri Oct 16, 2020 11:48 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Finding the amount of molecules in compounds using mole conversions
- Replies: 3
- Views: 301
Re: Finding the amount of molecules in compounds using mole conversions
Could someone explain how 1 mol = 6.022 x 10 23 atoms but can also equal 6.022 x 10 23 molecules? Also, there is a problem in the textbook that says to "Calculate the amount of urea molecules, OC(NH 2 ) 2 in 2.5 x 10 5 g of urea," but gives the answer (3.8 x 10 3 ) in moles. If 1 mol = 6....
- Fri Oct 16, 2020 11:42 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Jumping energy levels vs. Removing an electron
- Replies: 3
- Views: 142
Re: Jumping energy levels vs. Removing an electron
From the E = -hR/n^2 equation we know that the greater the n, the closer E gets to 0. How close is close enough to be considered as 0? In other words, after how many levels does an electron have to move up in order for it to be considered as no longer interacting with the atom? Also, is it differen...
- Fri Oct 16, 2020 11:40 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3665353
Re: Post All Chemistry Jokes Here
what is batman's favorite element?
sodium! na na na na na na na na!
sodium! na na na na na na na na!
- Fri Oct 16, 2020 11:37 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Conservation of energy
- Replies: 4
- Views: 162
Re: Conservation of energy
For the hydrogen Bohr model, I was a bit confused about the conservation of energy. Does the electron always start at n=1 since it is a Hydrogen atom? If so, how can the electron end up at a different energy level other than n=1? For example, if the electron is excited to n=3 and drops back down to...
- Fri Oct 16, 2020 11:33 pm
- Forum: SI Units, Unit Conversions
- Topic: Mnemonic
- Replies: 6
- Views: 1141
Re: Mnemonic
Shana Patel 1C wrote:Thank you so much, that was so helpful! I'm still shocked that both of you used the same one. Did you learn it in high school, or did I miss something during class?
Yes I learned it in high school!
- Sat Oct 10, 2020 9:15 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E 23
- Replies: 3
- Views: 203
Re: E 23
Yes. You need to multiply it by it's stoichiometric ratio to the other ion. For instance, 10 H20 molecules for every molecule of Sodium Carbonate Hydrate. Hope this helps!
- Sat Oct 10, 2020 8:58 pm
- Forum: SI Units, Unit Conversions
- Topic: Mnemonic
- Replies: 6
- Views: 1141
Re: Mnemonic
I remember it as K.H.D.U.D.C.M : King Henry Doesn't Usually Drink Chocolate Milk. Or Kilo, Hecto, Deca, Unit (for example: gram), Deci, Centi, Mili. Hope this helps!
- Sat Oct 10, 2020 8:56 pm
- Forum: SI Units, Unit Conversions
- Topic: Unit Rounding
- Replies: 11
- Views: 482
Re: Unit Rounding
It really depends! I rely heavily on the significant figure rules I've learned in high school. Try to read up on significant figures in the textbook. The way I solve problems is by not rounding as much as possible as this can make your data inaccurate. Do your calculations then find the needed signi...
- Sat Oct 10, 2020 8:53 pm
- Forum: Properties of Light
- Topic: Sun Spectrum
- Replies: 3
- Views: 176
Re: Sun Spectrum
I believe that the sun emits all forms of electromagnetic radiation. If we had a different sun (a different star) I believe we may have found different amounts of each radiation, as our sun emits an unequal amount of each portion of the spectrum. Hope this helps!
- Mon Oct 05, 2020 8:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing the E-textbook [ENDORSED]
- Replies: 125
- Views: 33272
Re: Accessing the E-textbook [ENDORSED]
I'm not 100% sure if it's mandatory, but I have used the free trial and completed the Week 1 homework and it showed up it in the gradebook on CCLE. And I'm pretty sure on the syllabus it makes up a part of the grade percentage. Hope this helps!