Search found 99 matches

by Kelly Singh
Sun Feb 21, 2021 9:17 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: State function?
Replies: 36
Views: 104

Re: State function?

No, a good giveaway is the delta sign in front of the variable though :)
by Kelly Singh
Sun Feb 21, 2021 9:12 pm
Forum: Administrative Questions and Class Announcements
Topic: struggling
Replies: 66
Views: 210

Re: struggling

I like to repeat questions until I understand how to do them. Keep your head up, only a few more weeks!
by Kelly Singh
Thu Feb 18, 2021 8:22 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Thermodynamically Favorable
Replies: 26
Views: 61

Re: Thermodynamically Favorable

A reaction is thermodynamically favorable when enthalpy decreases and entropy increases. This also means when the change in Gibbs Free energy is negative.
by Kelly Singh
Thu Feb 18, 2021 8:09 pm
Forum: Student Social/Study Group
Topic: Culinary Chemistry
Replies: 63
Views: 355

Re: Culinary Chemistry

305405193 wrote:What in chemistry makes flavors in food taste different other than heat?


I have always wondered this!
by Kelly Singh
Thu Feb 18, 2021 8:05 pm
Forum: Student Social/Study Group
Topic: Culinary Chemistry
Replies: 63
Views: 355

Re: Culinary Chemistry

Janna Shakiba wrote:
Mari Williams 1K wrote:My brother and I once shattered a glass pan of brownies after putting it on a cold metal table straight out of the oven...truly tragic


Lmao I've done this too


Me too!!
by Kelly Singh
Thu Feb 18, 2021 2:52 pm
Forum: Van't Hoff Equation
Topic: Van't Hoff equation
Replies: 7
Views: 37

Re: Van't Hoff equation

I think they're virtually the same, but it might depend on what information you are given.
by Kelly Singh
Mon Feb 15, 2021 10:20 am
Forum: Student Social/Study Group
Topic: Silly Mistakes?
Replies: 60
Views: 285

Re: Silly Mistakes?

Thank you so much for this
by Kelly Singh
Mon Feb 15, 2021 10:15 am
Forum: Calculating Work of Expansion
Topic: Constant Pressure and Constant Volume Constants for Ideal Gases
Replies: 3
Views: 10

Re: Constant Pressure and Constant Volume Constants for Ideal Gases

Ashlen Bullock 1H wrote:The constants for Cp and Cv for a monatomic ideal gas should be on the equation sheet. Cp=5/2R and Cv=3/2R. They are different for a diatomic ideal gas though.




Would we be told if the ideal gas was diatomic?
by Kelly Singh
Mon Feb 15, 2021 10:13 am
Forum: Student Social/Study Group
Topic: Practicing for Midterm 1
Replies: 12
Views: 64

Re: Practicing for Midterm 1

Doing the problems mentioned in the outlines and attending the UA workshops really help! Which UA workshops are most helpful? Although I believe all the UA workshops are very helpful (so I'd encourage going to all), I typically go to Justin and Matthew's workshops!! They are AMAZING. Also, to answe...
by Kelly Singh
Mon Feb 15, 2021 9:58 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Intrusive vs. Extrusive
Replies: 5
Views: 27

Re: Intrusive vs. Extrusive

Oh! No worries :)
by Kelly Singh
Mon Feb 15, 2021 9:42 am
Forum: Administrative Questions and Class Announcements
Topic: MyUCLA Grade
Replies: 27
Views: 167

Re: MyUCLA Grade

I think my Chemistry Community points are off? How often do they get updated?
by Kelly Singh
Mon Feb 08, 2021 10:30 am
Forum: Calculating Work of Expansion
Topic: friday lecture spontaneity question
Replies: 2
Views: 16

Re: friday lecture spontaneity question

The gas that we are looking at is the yellow gas. In the top picture, the yellow gas is trapped in the small skinny volume. When you open it up, the gas will spontaneously move into the bigger volume (increase in entropy). This is why there is an arrow with "spontaneously" going from the ...
by Kelly Singh
Mon Feb 08, 2021 10:29 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Intrusive vs. Extrusive
Replies: 5
Views: 27

Re: Intrusive vs. Extrusive

Hi! Can someone explain the difference between intrusive and extrusive properties and how that applies to heat capacity and specific heat capacity? I believe in the lecture Dr. Lavelle mentioned that heat capacity was an extrusive property and specific heat capacity was an intrusive property. Where...
by Kelly Singh
Mon Feb 08, 2021 10:28 am
Forum: Student Social/Study Group
Topic: Book Recommendations
Replies: 60
Views: 166

Re: Book Recommendations

I need new book recommendations haha. I've just been rereading my favorite books over this quarantine. Right now I am reading the Heroes of Olympus books by Rick Riordan. LOL i've been rereading the percy jackson series for comfort reading these days hahaha haha I've been rereading the Hunger Games...
by Kelly Singh
Mon Feb 08, 2021 10:27 am
Forum: Student Social/Study Group
Topic: Book Recommendations
Replies: 60
Views: 166

Re: Book Recommendations

Lauren Strickland 1B wrote:I really enjoyed Cat's Cradle and Six of Crows.


YES! so good
by Kelly Singh
Mon Feb 08, 2021 10:26 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Assuming 298 K
Replies: 7
Views: 25

Re: Assuming 298 K

Anna Yakura 2F wrote:Hello, are you allowed to assume that temperature is 298K if the question does not specify? For example, on 4D.7 on the outlines, it didn't state the temperature but when I assumed 298K, I got the right answer. When am I allowed to do this?


I would assume so :)
by Kelly Singh
Mon Feb 08, 2021 10:25 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Converting from ml to moles/grams
Replies: 3
Views: 17

Re: Converting from ml to moles/grams

EmilyC_3D wrote:When converting from ml to moles for gases, should we always use PV=nRT?
Alternatively, when converting from ml to moles for solids, should we always use density?

Thank you!


Yes!
by Kelly Singh
Mon Feb 08, 2021 10:24 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Study Approach thermodynamics
Replies: 8
Views: 23

Re: Study Approach thermodynamics

Siwa Hwang 3G wrote:Watch youtube videos with diagrams that help you visualize the problem


Any youtube video recommendations that have helped a lot?
by Kelly Singh
Mon Feb 08, 2021 10:23 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Study Approach thermodynamics
Replies: 8
Views: 23

Re: Study Approach thermodynamics

Karen Elrayes 1L wrote:I feel like this section is a lot more challenging because it's a little difficult to know how to start every problem. Any tips?


I have been having a difficult time too. It has helped to write out all of my known values and the unknown values that I need. Then I write out all relevant equations.
by Kelly Singh
Mon Feb 08, 2021 10:21 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: DeltaE vs DeltaU
Replies: 13
Views: 32

Re: DeltaE vs DeltaU

It helps to stay consistent with whichever one you use, though.
by Kelly Singh
Mon Feb 08, 2021 10:20 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 6
Views: 26

Re: Entropy

It is all dependent on the info given. Generally, entropy is the amount of disorder in a system. Systems naturally move towards more entropy.
by Kelly Singh
Mon Feb 08, 2021 10:18 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Using R in thermodynamic equations
Replies: 24
Views: 80

Re: Using R in thermodynamic equations

There are 4 different constants, depends on what you are using it for.
by Kelly Singh
Mon Feb 08, 2021 10:17 am
Forum: Student Social/Study Group
Topic: Practicing for Midterm 1
Replies: 12
Views: 64

Re: Practicing for Midterm 1

Thank you!
by Kelly Singh
Wed Jan 27, 2021 5:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1 Ka/Kb Values
Replies: 10
Views: 42

Re: Midterm 1 Ka/Kb Values

just know how to convert I think
by Kelly Singh
Wed Jan 27, 2021 5:20 pm
Forum: Administrative Questions and Class Announcements
Topic: Lecture on 1/29
Replies: 4
Views: 17

Re: Lecture on 1/29

no lecture! but there is a midterm :)
by Kelly Singh
Wed Jan 27, 2021 5:11 pm
Forum: Administrative Questions and Class Announcements
Topic: classes lavelle teaches
Replies: 2
Views: 30

Re: classes lavelle teaches

Does anyone know who teaches 14C?
by Kelly Singh
Wed Jan 27, 2021 5:07 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5J.5 d
Replies: 6
Views: 19

Re: 5J.5 d

So, the correct answer is that the reaction would shift towards the products?
by Kelly Singh
Thu Jan 21, 2021 2:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: conjugate base
Replies: 14
Views: 67

Re: conjugate base

this is called the conjugate seesaw! Conjugate bases of strong acids are weak and conjugate acids of strong bases are weak.
by Kelly Singh
Thu Jan 21, 2021 2:36 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Total Pressure
Replies: 26
Views: 110

Re: Total Pressure

sum of equilibrium pressures in a system.
by Kelly Singh
Thu Jan 21, 2021 2:32 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Weak vs. Strong Acids and Bases
Replies: 9
Views: 62

Re: Weak vs. Strong Acids and Bases

There is a list of strong acids and bases in the textbook. But generally, strong acids will contain halogens (Cl, Br, I) and strong bases will contain elements from group 1 & 2 (Li, Na, K, Rb, Cs, Ca, Sr, Ba). https://sites.google.com/site/chempendix/strong-acids-bases?authuser=0#h.p_ID_32 Than...
by Kelly Singh
Thu Jan 21, 2021 2:29 pm
Forum: Student Social/Study Group
Topic: Practicing for Midterm 1
Replies: 12
Views: 64

Re: Practicing for Midterm 1

Alara Aygen 3K wrote:Doing the problems mentioned in the outlines and attending the UA workshops really help!


Which UA workshops are most helpful?
by Kelly Singh
Thu Jan 21, 2021 2:28 pm
Forum: Student Social/Study Group
Topic: Practicing for Midterm 1
Replies: 12
Views: 64

Re: Practicing for Midterm 1

I haven't taken an exam for Lavelle before. What material should i use to study and practice for the midterm? Is there anything other than the workshops, homework and textbook problems? Where do i find old problems from previous midterms? I like to fill out the outlines and make sure I know all of ...
by Kelly Singh
Thu Jan 21, 2021 2:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Studying for Midterm #1
Replies: 63
Views: 181

Re: Studying for Midterm #1

I like to fill out the outlines and write info for all of the learning objectives.
by Kelly Singh
Mon Jan 11, 2021 8:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chapter 5 question 61
Replies: 4
Views: 25

Re: Chapter 5 question 61

Since the system is being compressed, which applies to pressure, we are only looking at moles of gas. Therefore, since there are 6 moles of gas on either side of the equation, the system would not favor either side when compressed. Why don't you take the six moles of gaseous water into account on t...
by Kelly Singh
Fri Jan 08, 2021 8:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Points
Replies: 13
Views: 77

Re: Chemistry Community Points

thank you all!
by Kelly Singh
Wed Jan 06, 2021 9:27 am
Forum: Administrative Questions and Class Announcements
Topic: Lecture Format
Replies: 22
Views: 128

Re: Lecture Format

I think he also mentioned that midterms will be during lecture times
by Kelly Singh
Wed Jan 06, 2021 9:26 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Points
Replies: 13
Views: 77

Chemistry Community Points

If I had 5 extra posts from last quarter (55) do they carry over to this quarter? or do I still have to complete 50 total
by Kelly Singh
Wed Jan 06, 2021 9:22 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reverse Reactions
Replies: 12
Views: 73

Re: Reverse Reactions

Why do we have to take the reciprocal of the Kc/Kp when using the reverse reactions? we have to take the reciprocal because it is always products/reactants, and when the reaction is reversed the original products become reactants and the original reactants become products. You can think about it li...
by Kelly Singh
Wed Jan 06, 2021 9:19 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Forward vs Reverse Reactions
Replies: 3
Views: 26

Re: Forward vs Reverse Reactions

My understanding is that when you add more reactant to an reaction that is already at equilibrium, the reaction shifts to the right (forward reaction) and more product is produced, allowing the reaction to regain equilibrium. However, when you add more product to an equation that is already at equi...
by Kelly Singh
Wed Jan 06, 2021 9:17 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What is an activity?
Replies: 9
Views: 87

Re: What is an activity?

but in all honesty I'm a little confused by it also haha
by Kelly Singh
Wed Jan 06, 2021 9:17 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: What is an activity?
Replies: 9
Views: 87

Re: What is an activity?

I think its just a way to generalize the K value so that it has no units. Since K can be taken from concentration or partial pressure values, we call the input activities.
by Kelly Singh
Wed Jan 06, 2021 9:12 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE tables
Replies: 4
Views: 36

Re: ICE tables

When solving for the equilibrium constant, how do you know if the problem requires an ICE table? Is it when initial concentrations are given but not the equilibrium concentrations, so they must be solved for? I think ICE tables are usually used when you are given at least one initial or final conce...
by Kelly Singh
Sat Dec 12, 2020 9:45 pm
Forum: Lewis Acids & Bases
Topic: textbook 6A.15
Replies: 1
Views: 35

Re: textbook 6A.15

I think your answer is correct since Sulfur can have an expanded octet. The compound has resonance and can be drawn in different ways.
by Kelly Singh
Sat Dec 12, 2020 9:43 pm
Forum: Coordinate Covalent Bonds
Topic: oxidation state of iron
Replies: 3
Views: 20

Re: oxidation state of iron

It is +2
by Kelly Singh
Sat Dec 05, 2020 11:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 13
Views: 80

Re: coordination number

Can someone explain more in detail of what bidentate means in a coordination compound and how it is different from a monodentate? Bidentate ligands are able to attach/bond to the transition metal twice. (Tridentate= three times, polydentate= multiple bonds) Sorry, forgot to add this. This means tha...
by Kelly Singh
Sat Dec 05, 2020 11:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 13
Views: 80

Re: coordination number

lwong Dis1L wrote:Can someone explain more in detail of what bidentate means in a coordination compound and how it is different from a monodentate?


Bidentate ligands are able to attach/bond to the transition metal twice. (Tridentate= three times, polydentate= multiple bonds)
by Kelly Singh
Sat Dec 05, 2020 11:46 pm
Forum: Bronsted Acids & Bases
Topic: Strong acids
Replies: 7
Views: 70

Re: Strong acids

claire ikemiya_2I wrote:And if you are ever asked which acid is stronger than another, remember the elements with a smaller atomic radii is stronger since it has a shorter bond with H, which is requires more energy to break.


This is so helpful, thank you!
by Kelly Singh
Sat Dec 05, 2020 11:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 21
Views: 161

Re: Final

Lizbeth Garcia 1F wrote:I believe it is similar, just, maybe more questions since they are giving us more time to complete it.


Do you know how much time we're being given?
by Kelly Singh
Sat Dec 05, 2020 11:43 pm
Forum: General Science Questions
Topic: TCA for Removing Tattoos
Replies: 1
Views: 56

Re: TCA for Removing Tattoos

I don't know very much about tattoo removal but I thought this was a very interesting post. Since its an acid, I would imagine that TCA works by promoting cell turnover (destroying cells) which causes new skin growth, and thereby lightening the tattoo. Definitely doesn't sound like the most efficien...
by Kelly Singh
Sat Dec 05, 2020 11:39 pm
Forum: Student Social/Study Group
Topic: Grading Scale for Chem14A
Replies: 29
Views: 321

Re: Grading Scale for Chem14A

claire ikemiya_2I wrote:So if all we know is that 50% is a passing grade, do we project that the passing range is larger or that the grade is going to be curved?


I don't think that he usually curves grades
by Kelly Singh
Sat Dec 05, 2020 11:38 pm
Forum: Student Social/Study Group
Topic: Grading Scale for Chem14A
Replies: 29
Views: 321

Re: Grading Scale for Chem14A

almost_ethan wrote:
tholz11 wrote:I believe you need a 93% to receive an A in the class

Does anyone else know if this is true? :0


Yes, that's what I remember from the syllabus.
by Kelly Singh
Sat Dec 05, 2020 11:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Sapling W9 #3
Replies: 6
Views: 57

Re: Sapling W9 #3

How come hexagonal planar is not a possible geometry for a compound with a coordination number of 6? Just like Jasmine said, you have to remember that the compounds exist in 3-dimensions. Each region of electron density moves as far away from other regions. If you think about it, the points on a he...
by Kelly Singh
Sat Dec 05, 2020 11:33 pm
Forum: Naming
Topic: en
Replies: 8
Views: 78

Re: en

Daniela_Martinez_3B wrote:en is ethylenediamine (H2NCH2CH2NH2)


Do you know if there are any other shorthand versions of compounds that we should know?
by Kelly Singh
Sat Dec 05, 2020 11:31 pm
Forum: Lewis Acids & Bases
Topic: KA and pKA
Replies: 19
Views: 153

Re: KA and pKA

KA measures the strength of an acid whereas pKA is the negative log of that value. It's just an easier and more convenient way to refer to the KA value as far as I know. =)
by Kelly Singh
Sat Dec 05, 2020 11:28 pm
Forum: Student Social/Study Group
Topic: Week 8/9 Thoughts/Worries
Replies: 66
Views: 504

Re: Week 8/9 Thoughts/Worries

I tend to do much better with the calculation/mathematical portions of this class and not as well with the conceptual parts. I did a lot better on the first midterm than the second one. Does anyone have a specific way that they study for conceptual things like hybridization because I have a hard tim...
by Kelly Singh
Sat Nov 28, 2020 10:41 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8767
Views: 1490157

Re: Post All Chemistry Jokes Here

Why did the noble gas cry?

His friends Argon
by Kelly Singh
Sat Nov 28, 2020 10:32 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: chelates
Replies: 4
Views: 57

Re: chelates

^exactly. If there are multiple lone pairs available for other compounds to bond to, it is more likely to form a coordinate compound.
by Kelly Singh
Sat Nov 28, 2020 10:31 am
Forum: Administrative Questions and Class Announcements
Topic: Riya's Week 9 Office Hours (11/30)
Replies: 1
Views: 35

Re: Riya's Week 9 Office Hours (11/30)

Thank you for letting us know!
by Kelly Singh
Sat Nov 28, 2020 10:29 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining shape with lone pairs
Replies: 5
Views: 32

Re: Determining shape with lone pairs

You have to take into account all electron densities when making the initial shape, then, to determine the actual shape of the molecules, you only look at how many actual atoms there are. Just as Dr. Lavelle had shown in his lectures, it does not matter which point of electron density you call the l...
by Kelly Singh
Mon Nov 23, 2020 10:39 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8767
Views: 1490157

Re: Post All Chemistry Jokes Here

705324760 wrote:Two chemists walk into a bar.

One says, “I’ll have an ‎H2O.” The other says, “I’ll have an ‎H2O, too.” The second chemist dies.


I laughed at this, thank you
by Kelly Singh
Mon Nov 23, 2020 10:38 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8767
Views: 1490157

Re: Post All Chemistry Jokes Here

Why did Avogadro love golf?

He always got a MOLE in one!
by Kelly Singh
Mon Nov 23, 2020 10:37 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8767
Views: 1490157

Re: Post All Chemistry Jokes Here

Why should you go drinking with neutrons?

When you go, there's no charge!
by Kelly Singh
Mon Nov 23, 2020 10:36 am
Forum: Ionic & Covalent Bonds
Topic: How to determine which molecule is more ionic?
Replies: 11
Views: 123

Re: How to determine which molecule is more ionic?

Determine the difference in electronegativities between the two atoms in the molecule you are examining, and which ever molecule produces the greater difference is the molecule that is more ionic. To add to this, elements on the right side of the periodic table are generally more electronegative th...
by Kelly Singh
Thu Nov 12, 2020 11:12 pm
Forum: Lewis Structures
Topic: Aqueous v Solid
Replies: 8
Views: 88

Re: Aqueous v Solid

The only difference would be the presence of water! Aqueous means dissolved in water :)
by Kelly Singh
Wed Nov 11, 2020 12:34 pm
Forum: Dipole Moments
Topic: Interactions Between Ions and Molecules
Replies: 7
Views: 57

Re: Interactions Between Ions and Molecules

Hi! So just confirming my understanding: Ion--ion interactions are stronger because they have full negative and positive charges which attract each other. Other interactions are not as strong because the charges are only partial. Please let me know if this looks like a complete and accurate summati...
by Kelly Singh
Wed Nov 11, 2020 12:33 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidization Numbers
Replies: 10
Views: 79

Re: Oxidization Numbers

I thought that the midterm only covered up to the end of Outline 2?
by Kelly Singh
Wed Nov 11, 2020 12:29 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 31
Views: 325

Re: Midterm 2

almost_ethan wrote:Does anyone know if Dr. Lavelle will hold a review session for Midterm 2?


Not sure about Dr. Lavelle, but I know that the UA who has a workshop on Saturday is having a review session.
by Kelly Singh
Wed Nov 11, 2020 12:28 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 31
Views: 325

Re: Midterm 2

almost_ethan wrote:
Kelly Singh wrote:Is the next midterm during week 7 or 8?

Midterm 2 is Week 7, during discussion.


Thank you!
by Kelly Singh
Wed Nov 04, 2020 7:10 pm
Forum: Quantum Numbers and The H-Atom
Topic: Are there subshells past f?
Replies: 28
Views: 177

Re: Are there subshells past f?

Thank you!
by Kelly Singh
Tue Nov 03, 2020 7:03 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Formation of Ions
Replies: 5
Views: 51

Re: Formation of Ions

Do you think it might have something to do with atoms' tendencies to fill their shells halfway? hence the 3d^5?
by Kelly Singh
Tue Nov 03, 2020 7:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: Are there subshells past f?
Replies: 28
Views: 177

Are there subshells past f?

From what I understand, theoretically, the n value can increase indefinitely. Are there more letters (subshells, ie. spdf...) that correspond to the higher values?
by Kelly Singh
Mon Nov 02, 2020 5:31 pm
Forum: Student Social/Study Group
Topic: Halloween!!!
Replies: 54
Views: 350

Re: Halloween!!!

A little late but Happy Halloween! I celebrated at the #2 public university (UC Berkeley)
by Kelly Singh
Mon Nov 02, 2020 5:28 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 31
Views: 325

Re: Midterm 2

Is the next midterm during week 7 or 8?
by Kelly Singh
Mon Nov 02, 2020 5:27 pm
Forum: Resonance Structures
Topic: Single vs. Double Bonds
Replies: 5
Views: 43

Re: Single vs. Double Bonds

From what I know, bond length in double bonds is around 1.34 angstrom and single bonds is 1.54 angstrom. Bond length is inversely proportional to bond energy, so less bond length means more energy, making it a harder bond to break.
by Kelly Singh
Mon Oct 26, 2020 6:53 pm
Forum: Properties of Light
Topic: Textbook Question Number 1A 3 c
Replies: 3
Views: 61

Re: Textbook Question Number 1A 3 c

If you think about the wave like a function on a graph, the "extent of change" would refer to the slope. A wave with a lower frequency would have a smaller slope, or extent of change, than a wave with a higher frequency. This question is definitely hard to visualize, but I hope this helps :)
by Kelly Singh
Mon Oct 26, 2020 6:48 pm
Forum: Molarity, Solutions, Dilutions
Topic: Textbook problem G.13
Replies: 3
Views: 53

Re: Textbook problem G.13

Where do you find the solution manual? Is it different from the odd-number exercise answer key on the back of the textbook? When you click on the link to sapling from CCLE, the homepage that pops up has a column that says "Resources" right in the middle. If you click on the last link unde...
by Kelly Singh
Mon Oct 26, 2020 6:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm topics and information
Replies: 8
Views: 133

Re: Midterm topics and information

While studying the textbook, I would make sure to focus on the conceptual information related to what we've discussed in lecture in addition to solving the textbook problems. My guess is that the midterm will have conceptual questions in addition to the calculation-based questions. I'm kind of nerv...
by Kelly Singh
Mon Oct 26, 2020 6:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm topics and information
Replies: 8
Views: 133

Re: Midterm topics and information

While studying the textbook, I would make sure to focus on the conceptual information related to what we've discussed in lecture in addition to solving the textbook problems. My guess is that the midterm will have conceptual questions in addition to the calculation-based questions. I'm kind of nerv...
by Kelly Singh
Mon Oct 26, 2020 6:44 pm
Forum: Student Social/Study Group
Topic: Midterm
Replies: 5
Views: 88

Re: Midterm

All of the topics covered in his lectures up until last Wednesday will be covered. So, I think the basic principles of quantum numbers may be included. Nothing in depth, though.
by Kelly Singh
Wed Oct 21, 2020 5:42 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Calculating Velocity
Replies: 5
Views: 70

Re: Calculating Velocity

Darren1e wrote:I understand what the uncertainty is, because we cannot measure the exact momentum and position of an electron but how do they even determine the "amount" of uncertainty.


The "amount" of uncertainty is the range of values in which the actual value could fall within.
by Kelly Singh
Tue Oct 20, 2020 9:47 pm
Forum: DeBroglie Equation
Topic: Difference between DeBroglie and regular wavelength
Replies: 4
Views: 47

Re: Difference between DeBroglie and regular wavelength

Hello! The De Broglie equation is used to the find the wavelength of a particle (i.e. an electron) with wave-like properties . Basically, for very small particles, the De Broglie equation measures the wavelength of the wave-like property that particle exhibits. The other equation you mentioned, suc...
by Kelly Singh
Tue Oct 20, 2020 9:47 pm
Forum: DeBroglie Equation
Topic: Difference between DeBroglie and regular wavelength
Replies: 4
Views: 47

Re: Difference between DeBroglie and regular wavelength

The values should be the same, it just depends on what information you are given/need to find. If you are dealing with momentum (mass and/or velocity) then you should use DeBroglie's equation. If you are dealing with energy and/or frequency, you should use one of the other two. Hope this helps! Yes...
by Kelly Singh
Mon Oct 19, 2020 8:10 pm
Forum: Properties of Electrons
Topic: How can electrons have wavelenghts
Replies: 5
Views: 42

Re: How can electrons have wavelenghts

I think it has something to do with the photoelectric effect. I remember hearing someone say that just as light diffracts if passed through two slits, electrons will diffract when passed through the same structure. I hope this helps a little bit.
by Kelly Singh
Mon Oct 19, 2020 8:02 pm
Forum: DeBroglie Equation
Topic: Difference between DeBroglie and regular wavelength
Replies: 4
Views: 47

Difference between DeBroglie and regular wavelength

What is the difference between using the DeBroglie equation vs using c=(wavelength)(frequency) and/or E=(h)(frequency) to calculate wavelength? Will the values be exactly the same?
by Kelly Singh
Fri Oct 16, 2020 2:10 pm
Forum: Photoelectric Effect
Topic: Units (eV)
Replies: 5
Views: 69

Re: Units (eV)

Is the electron volt just a different way to measure energy or are there situations in which using the eV more useful than just Joules? An 3lectron volt is the energy required to ionize a single atom so it is extremely small compared to a joule. In terms of when each should be used, eV is more comm...
by Kelly Singh
Fri Oct 16, 2020 2:07 pm
Forum: Photoelectric Effect
Topic: Units (eV)
Replies: 5
Views: 69

Re: Units (eV)

Yeprem wrote:and are we supposed to remember what eV equals to?


My TA said that since if it was included in a question on a test, the conversion would most likely be given on the formula sheet.
by Kelly Singh
Mon Oct 12, 2020 5:23 pm
Forum: Photoelectric Effect
Topic: Units (eV)
Replies: 5
Views: 69

Units (eV)

When I was reading Focus Topic 1B, I came across the units "eV". I have never seen this before but I think they are units of energy? Can someone explain how they compare to Joules and how to convert them?
by Kelly Singh
Sat Oct 10, 2020 5:15 pm
Forum: Properties of Electrons
Topic: Question 1A.3
Replies: 2
Views: 61

Re: Question 1A.3

Wow that makes so much sense. Thank you!!!!
by Kelly Singh
Fri Oct 09, 2020 4:34 pm
Forum: Properties of Electrons
Topic: Question 1A.3
Replies: 2
Views: 61

Question 1A.3

The question is: Which of the following happens when the frequency of electromagnetic radiation decreases? Explain your reasoning. (a) The speed of the radiation decreases. (b) The wavelength of the radiation decreases. (c) The extent of the change in the electrical field at a given point decreases....
by Kelly Singh
Wed Oct 07, 2020 3:59 pm
Forum: Limiting Reactant Calculations
Topic: M.9 Clarification
Replies: 8
Views: 68

Re: M.9 Clarification

On the same problem M.9, does anyone know how to solve for part b.) Calculate the maximum mass of copper(II) hydroxide that can be formed when 2.00 g of sodium hydroxide is added to 80.0 mL of .500M Cu(NO3)2 (aq)... thank you! First, convert 2g NaOH to mols by dividing by its molar mass--39.997. Yo...
by Kelly Singh
Wed Oct 07, 2020 3:48 pm
Forum: Properties of Light
Topic: Focus 1A Question 11, Series of Light
Replies: 3
Views: 27

Re: Focus 1A Question 11, Series of Light

No problem:)
by Kelly Singh
Wed Oct 07, 2020 12:49 pm
Forum: Limiting Reactant Calculations
Topic: M.9 Clarification
Replies: 8
Views: 68

Re: M.9 Clarification

I had the same question, Lisa. I had to look up the formula for each compound because I was having trouble determining it solely from the name. I know that the (II) means a positive charge of 2, but I'm not sure what to do with that information.
by Kelly Singh
Wed Oct 07, 2020 12:46 pm
Forum: Properties of Light
Topic: Focus 1A Question 11, Series of Light
Replies: 3
Views: 27

Re: Focus 1A Question 11, Series of Light

I researched this a little bit and, from what I can gather, the lines that are grouped together all have the same starting energies. For example, in the Balmer series, electrons always start and return to n=1. Similarly, in the Lyman series, they always start and return to n=1. Hope this helps!
by Kelly Singh
Tue Oct 06, 2020 10:33 pm
Forum: Empirical & Molecular Formulas
Topic: Question Regarding F.23 in the Textbook
Replies: 3
Views: 59

Re: Question Regarding F.23 in the Textbook

hey nicolette! For this question, you should start by finding the molar mass of each compound. You would then set up a conversion equation with the molar mass of the whole compound in the denominator, and the molar mass of carbon in the numerator. For example, to find the mass % comp for ethene, you...
by Kelly Singh
Mon Oct 05, 2020 1:26 pm
Forum: Properties of Light
Topic: Wave Properties
Replies: 5
Views: 79

Wave Properties

In the video module titled: "Wave Properties and the Debroglie Equation", Dr. Lavelle mentions that all matter has wave properties due to the observed behavior of electrons. He later mentioned that since objects with large masses produce extremely small wavelengths, they are said to not ex...

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