Search found 56 matches

by Cindy Adiwidjaja 1B
Sat Jan 11, 2020 10:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Week 1 lecture note
Replies: 4
Views: 59

Re: Week 1 lecture note

Thank you so much! Are you a TA or UA? If so, can we know who you are so we can attend your sessions, because these notes are very helpful!
by Cindy Adiwidjaja 1B
Sat Jan 11, 2020 10:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc vs. Kp [ENDORSED]
Replies: 4
Views: 26

Re: Kc vs. Kp [ENDORSED]

When dealing with gases, we assume that we have to use Kp since gases have pressure. When dealing with aqueous solutions, we assume that we use Kc since aqueous solutions have concentrations.
by Cindy Adiwidjaja 1B
Sat Jan 11, 2020 10:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating K
Replies: 5
Views: 19

Re: Calculating K

We do not include solids and liquids when we calculate K because they stay constant and will ultimately have no effect on K. If you did want to include it, then you would still be essentially adding it to the top (products) and bottom (reactants) and they would still divide out to be 1.
by Cindy Adiwidjaja 1B
Thu Jan 09, 2020 11:41 pm
Forum: Administrative Questions and Class Announcements
Topic: New Account for 14B?
Replies: 2
Views: 22

New Account for 14B?

Yay we all finished 14A and are now in 14B woohoo! I know that again for this quarter, we must post 5 posts every week, however, I realized that our accounts for Chemistry Community are linked with our UIDs, and that this is the same account we had for last quarter too. What this means is that our a...
by Cindy Adiwidjaja 1B
Thu Jan 09, 2020 11:38 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Do solids and liquids count in Q?
Replies: 5
Views: 26

Do solids and liquids count in Q?

So I know that for K, pure substances like solids and liquids do not change and therefore are not calculated into the K equilibrium. However, for the reaction quotient, Q, do we also not include these in our calculations?
by Cindy Adiwidjaja 1B
Sun Dec 08, 2019 6:18 pm
Forum: General Science Questions
Topic: 50 post grade
Replies: 17
Views: 239

Re: 50 post grade

Yes, it depends on the TA. Some check every week while others check at the end of the quarter. Honestly, since the TAs have so many students, I am pretty sure they just check to see if you have 50 at the end of the quarter. So, in the event that you do not, just make sure you reach 50 by tonight.
by Cindy Adiwidjaja 1B
Sun Dec 08, 2019 6:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Thank You!!
Replies: 1
Views: 35

Thank You!!

I just wanted to say thank you to everyone I have met in Chem 14A. It has truly been a roller coaster and I am so glad that it is finally done! I have met some incredible people in Chem 14A and I hope to see all of you again in Chem 14B. Thank you so much to all the TAs, UAs, and Dr. Lavelle. This h...
by Cindy Adiwidjaja 1B
Sun Dec 08, 2019 6:10 pm
Forum: General Science Questions
Topic: Curve
Replies: 9
Views: 100

Re: Curve

Does that mean that people who got Fs and Ds will have the exact same grade as people who actually got C-s. Or will the people who got C-s have slightly higher grades?
by Cindy Adiwidjaja 1B
Sun Dec 08, 2019 6:08 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 97
Views: 19975

Re: Final Jitters

I honestly find listening to calming music to be really helpful. Listen to some slow and calming music while you study so you do not feel overwhelemd.
by Cindy Adiwidjaja 1B
Sun Dec 08, 2019 6:06 pm
Forum: Bronsted Acids & Bases
Topic: Hydrogen Bonding
Replies: 10
Views: 65

Re: Hydrogen Bonding

No, this is a type of intermolecular force. Not an acid and base reaction
by Cindy Adiwidjaja 1B
Sun Dec 08, 2019 6:05 pm
Forum: Lewis Acids & Bases
Topic: What does it mean when something is strong?
Replies: 8
Views: 53

What does it mean when something is strong?

I know that there are strong acids and strong bases, but what does it actually mean?
by Cindy Adiwidjaja 1B
Wed Dec 04, 2019 12:48 am
Forum: Conjugate Acids & Bases
Topic: H-F in conjugate bases
Replies: 3
Views: 43

Re: H-F in conjugate bases

The other conjugate bases are not as strong, meaning they can not produce the same outcome as H-F can.
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:17 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 35
Views: 490

Re: Class Grading

I saw from previous years' posts that Lavelle also adds 10 points to every one's score out of 500. I do not know if this is still true, but this popped up a lot in Chemistry Community.
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Lecture on 11/27
Replies: 4
Views: 35

Re: Lecture on 11/27

Yes, Dr. Lavelle sent out an email saying that we will have class and discussion sections on wednesday.
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 7
Views: 51

Re: Test 2

Because half of the students will not have discussion this week, I believe the staff said we will get our test 2 back in week 10
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:11 pm
Forum: Administrative Questions and Class Announcements
Topic: finals
Replies: 5
Views: 54

Re: finals

The final is cumulative, meaning it will cover everything since Week 1, including things we have already been tested on.
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Difficulty
Replies: 14
Views: 95

Re: Difficulty

Coming from an underfunded and underprivileged high school, my only experience with Chemistry was during sophomore year, and was extremely unhelpful in terms of how it relates to this current class. I am struggling a lot in Chem 14A, and because the topics covered seems to by review for every one el...
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:06 pm
Forum: Lewis Acids & Bases
Topic: Lewis and Bronsted
Replies: 5
Views: 32

Re: Lewis and Bronsted

Lewis Acids and Bases involve ELECTRON transfers, while Bronsted Acids and Bases involve PROTONS.
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:03 pm
Forum: Administrative Questions and Class Announcements
Topic: Points
Replies: 11
Views: 100

Re: Points

In terms of the grading, I don't know if we are getting graded on a week to week basis, or at the end of the quarter. Some people say that if we have 50 by the end of the quarter we get all the points, but others say that we need to do 5 a week or else we do not get the points. If anyone knows the a...
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Points
Replies: 11
Views: 100

Re: Points

On Chemistry Community, every time you post something, you should see a number on the side of your name for your post. This number tells you how many posts you have made.
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 12:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 9 Homework
Replies: 2
Views: 27

Week 9 Homework

So I understand that Lavelle said that the homework for week 9 can be turned in during week 10 because of Thanksgiving break, however, if we have section this week that is not cancelled due to thanksgiving break, do we still turn in our homework?
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 11:59 am
Forum: Resonance Structures
Topic: What is a Resonance "Structure"
Replies: 12
Views: 78

Re: What is a Resonance "Structure"

Oh ok I see, thank you for helping!
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 11:58 am
Forum: Administrative Questions and Class Announcements
Topic: Video Modules
Replies: 5
Views: 35

Re: Video Modules

Yea I suppose you guys are right because the Video Modules were also very old. He probably does not have any other videos of his lessons.
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 11:56 am
Forum: General Science Questions
Topic: Chemistry Community Questions
Replies: 5
Views: 64

Re: Chemistry Community Questions

Yea I was confused because sometimes the dates for my posts are extremely off, saying that I posted in June of something, so I was unsure if the dates and 5 per week will still be taken into account even if the weeks are incorrect.
by Cindy Adiwidjaja 1B
Tue Nov 26, 2019 11:54 am
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 119

Re: Test 2 and Final

I heard that the TAs that already had section this week gave back test 2, but I am not quite sure. And in terms of the final, it will cover everything, even midterm stuff.
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 11:49 am
Forum: Formal Charge and Oxidation Numbers
Topic: Calculating formal charge
Replies: 4
Views: 34

Re: Calculating formal charge

Another way to think of it is to envision the electrons in the whole lewis structure, not in a singular atom. By looking it at a bigger picture, it will help.
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 11:34 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: nomenclature
Replies: 3
Views: 41

Re: nomenclature

Additionally, which nomenclatures should we already know? Its been a while since I took high school Chemistry, and I do not remember any chemical compounds other than water and carbon dioxide/monoxide. What others do we need to know?
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 11:14 am
Forum: Administrative Questions and Class Announcements
Topic: Video Modules
Replies: 5
Views: 35

Video Modules

The video modules that Lavelle posts on his website are extremely helpful, but does anyone know if he will post a video module for every topic we go over? So far, only the early Quantum unit is on his website, however, will there ever be any more?
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 11:12 am
Forum: General Science Questions
Topic: Chemistry Community Questions
Replies: 5
Views: 64

Chemistry Community Questions

I know that we need to submit 5 questions per week, however, is this checked on a weekly basis, or can we just end the quarter off with 50 posts, regardless of when they were posted. I know some people who do not do 5 a week, but are doing it at random times. By the end of the quarter, if we meet th...
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 11:05 am
Forum: Ionic & Covalent Bonds
Topic: Resonance (all bonds are a hybrid of different bonds)
Replies: 10
Views: 69

Re: Resonance (all bonds are a hybrid of different bonds)

Kayla Maldonado 1A wrote:How can you tell if a compound has resonance and do all resonance forms need to be drawn when being asked for a lewis dot diagram?

To my knowledge, any structure with non-single bonds has resonance. In terms of depicting it, I think everyone else who replied is right.
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 11:02 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Shape of Orbitals?
Replies: 3
Views: 55

Re: Shape of Orbitals?

Dr. Lavelle said that we do not need to worry about orbital shape for any test we encounter.
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 11:01 am
Forum: Student Social/Study Group
Topic: Midterm Grades
Replies: 7
Views: 81

Re: Midterm Grades

To my knowledge, I heard that the TAs have until Tuesday to finish grading all the Midterms, therefore, the earliest we can get them back is Wednesday
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 10:52 am
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 48
Views: 37849

Re: How to find my posts

Whenever you post something, there is a box on the right side of your post that has your information on it. Next to your name, there should be a number. By clicking that number, you can see all your posts, questions and replies, and can easily access all of your old work.
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 10:50 am
Forum: Lewis Structures
Topic: Lewis Dot Structures
Replies: 7
Views: 54

Re: Lewis Dot Structures

With any Lewis Dot Structure, it is best to figure out which atoms have the lowest possible Formal Charge. By manipulating the dot structure and figuring out which combination has the lowest dot structure, you should be fine.
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 10:47 am
Forum: Resonance Structures
Topic: how to draw
Replies: 6
Views: 33

Re: how to draw

Although we were faced with both types of examples, Lavelle usually draws them out separately, as multiple different structures with different type of bond arrangements, so I think we should stick to that.
by Cindy Adiwidjaja 1B
Mon Nov 11, 2019 10:43 am
Forum: Resonance Structures
Topic: What is a Resonance "Structure"
Replies: 12
Views: 78

What is a Resonance "Structure"

I understand that resonance is when a bond is a hybrid of a single and double, for example. However, I thought that the word "resonance" only applied when describing the bond type. Sometimes in class, Lavelle talks about Resonance "Structures". What is that exactly, if it is not ...
by Cindy Adiwidjaja 1B
Sat Oct 26, 2019 5:40 pm
Forum: Bond Lengths & Energies
Topic: Bond length strength
Replies: 6
Views: 50

Re: Bond length strength

All bond lengths we have been exposed to were given to us in the problem. Dr. Lavelle stated that these lengths were found through experimental data calculations and that we were specifically not going to get too in depth into that.
by Cindy Adiwidjaja 1B
Sat Oct 26, 2019 5:39 pm
Forum: Ionic & Covalent Bonds
Topic: Calculating Number of Valence Electrons
Replies: 7
Views: 53

Re: Calculating Number of Valence Electrons

When dealing with elements in the s and p blocks, just count the elements from left to right, SKIPPING the d block, until you get to your desired element. For example, for Oxygen, the elements in that row are Li, Be, B, C, N, O, F, Ne. In that order, Oxygen is the 6th element. Thus, Oxygen has 6 val...
by Cindy Adiwidjaja 1B
Sat Oct 26, 2019 5:33 pm
Forum: Ionic & Covalent Bonds
Topic: Resonance (all bonds are a hybrid of different bonds)
Replies: 10
Views: 69

Resonance (all bonds are a hybrid of different bonds)

In class, Dr. Lavelle said that in compounds with resonance, all bonds are really just a mix of different double and single bonds and that they are a hybrid of the two. In that case, how can we depict the most accurate bond type when drawing lewis structures?
by Cindy Adiwidjaja 1B
Sat Oct 26, 2019 5:29 pm
Forum: Ionic & Covalent Bonds
Topic: Cation
Replies: 23
Views: 171

Re: Cation

Everyone here is correct with their answers, however I wanted to give a quick tip on how I remember the difference.

For Cation (positive charge), I just think of the "t" as a "+(plus sign)"

For Anion, I just think of the "n" as a "Negative"
by Cindy Adiwidjaja 1B
Tue Oct 22, 2019 12:03 am
Forum: Ionic & Covalent Bonds
Topic: Week 4 Homework
Replies: 9
Views: 102

Week 4 Homework

For this week, are we supposed to do the homework based on the Quantum World, or based on the Ionic and Covalent Bonds?
by Cindy Adiwidjaja 1B
Sun Oct 20, 2019 6:17 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 356

Re: Best Way To Study?

I was going over the chapters in the textbook and I realized that Dr. Lavelle didn't go over some topics. Do we still need to know these or will only the content he introduces us in class be on the tests?
by Cindy Adiwidjaja 1B
Sun Oct 20, 2019 6:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Stern and Gerlach
Replies: 3
Views: 19

Re: Stern and Gerlach

So does that mean that an electron would shift from spin up to spin down, since orbitals are basically circular?
by Cindy Adiwidjaja 1B
Sun Oct 20, 2019 6:06 pm
Forum: Properties of Light
Topic: Explanation of Balmer and Lyman Series
Replies: 4
Views: 23

Re: Explanation of Balmer and Lyman Series

So does this imply that in common everyday life, electrons are constantly jumping from energy levels and that the spectrum just depicts what specific regions this occurs?
by Cindy Adiwidjaja 1B
Sun Oct 20, 2019 6:02 pm
Forum: DeBroglie Equation
Topic: When to combine equations
Replies: 10
Views: 68

When to combine equations

So in class we constantly use multiple equations when solving a question, and sometimes we manipulate equations to help us solve. However, how do we know when we can manipulate them and combine them to solve our questions? De Broglie's Equation is the mixture of two different equations, so it seems ...
by Cindy Adiwidjaja 1B
Sun Oct 20, 2019 5:52 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Stern and Gerlach
Replies: 3
Views: 19

Stern and Gerlach

I was having a hard time understanding the electron spin. What does spin up and spin down in terms of the physical atom? What is actually happening?
by Cindy Adiwidjaja 1B
Sun Oct 13, 2019 10:25 pm
Forum: Properties of Light
Topic: Combining Different Equations
Replies: 8
Views: 60

Combining Different Equations

When do we know that it is allowed to combine different equations? In class, we often times intermix E=hv, c=λv, E=pv, etc. Why are we allowed to intermix them and when do we know we need to?
by Cindy Adiwidjaja 1B
Sun Oct 13, 2019 10:15 pm
Forum: Properties of Light
Topic: Explanation of Balmer and Lyman Series
Replies: 4
Views: 23

Explanation of Balmer and Lyman Series

So Professor Lavelle showed a graph in class of the light spectrum which had different lines going through it. He referred to some as the Balmer Series and Lyman Series. I was just confused on what that graph actually was and what the lines explained.
by Cindy Adiwidjaja 1B
Sun Oct 13, 2019 10:09 pm
Forum: DeBroglie Equation
Topic: Wavelength
Replies: 6
Views: 52

Re: Wavelength

In terms of quantifying a wavelength as "measurable" or not, Professor Lavelle stated that anything with a wavelength of 10^-15 or higher should be considered while preforming calculations.
by Cindy Adiwidjaja 1B
Sun Oct 13, 2019 9:58 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 5
Views: 44

Re: E=hv

The equation spelled out is "energy = planck's constant x wavelenght", and since you want to find energy, this equation would be perfect, that is, if you are using it in the correct context.
by Cindy Adiwidjaja 1B
Sun Oct 13, 2019 9:54 pm
Forum: Photoelectric Effect
Topic: Intensity vs. Length of Waves
Replies: 4
Views: 33

Re: Intensity vs. Length of Waves

Higher intensity implies larger amplitude/larger "bumps", whereas shorter wavelength implies closer "bumps".
by Cindy Adiwidjaja 1B
Thu Oct 03, 2019 4:36 pm
Forum: Limiting Reactant Calculations
Topic: Homework Week 1
Replies: 18
Views: 194

Re: Homework Week 1

It's ultimately up to you to chose which 5 you want to complete, however, diversifying your homework questions and choosing one from each section is a good way to practice the different Fundamentals.
by Cindy Adiwidjaja 1B
Thu Oct 03, 2019 4:29 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs: follow the book or follow Sig Fig rules?
Replies: 3
Views: 60

Sig Figs: follow the book or follow Sig Fig rules?

While doing some of the homework, I noticed that the Solution Manual didn't follow the rules of Significant Figures and almost always used two decimal places for all the answers. I was just wondering if we needed to abide by the Solution Manual's numerical values or by the scientific Significant Fig...
by Cindy Adiwidjaja 1B
Thu Oct 03, 2019 4:23 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamentals E1
Replies: 4
Views: 67

Re: Fundamentals E1

You were correct in converting the moles into atoms. However, the next step is to convert the atoms into pm. Since it is stated in the question that the atoms are 144pm in radius, you know that they are 288pm in diameter (and it's easier to work with when it's in diameters). Since 1 atom of Ag is 28...
by Cindy Adiwidjaja 1B
Wed Oct 02, 2019 11:37 pm
Forum: Limiting Reactant Calculations
Topic: Why does the Limiting Reactant only affect the other reactant and not affect the product? [ENDORSED]
Replies: 4
Views: 67

Why does the Limiting Reactant only affect the other reactant and not affect the product? [ENDORSED]

In the example problem given in class, is was discovered that the CaC2 limited the H2O. However, since the CaC2 is the limiting reactant and not allowing the water to reach its full potential, how come the products produced are not limited as well? If we have less of the CaC2, shouldn't both the oth...
by Cindy Adiwidjaja 1B
Wed Oct 02, 2019 11:23 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 6
Views: 79

Re: Formula Units

What is a formula unit in terms of physical things? Is it just a general name for a general unit? Or does it represent something tangible? I know what an atom, molecule, and ion is, however I do not think I can conceptually wrap my head around what an actual formula unit is or what quantity it exact...

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