Search found 64 matches

by Abhi Vempati 2H
Wed Jan 22, 2020 4:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acids and Bases pka and pkb
Replies: 2
Views: 4

Re: Acids and Bases pka and pkb

Adding on to what @Hui Qiao Wu 1I mentioned, the lower the pka of an acid, the higher the pKb of its conjugate base. This is because of the equation pka + pKb = 14. Hope this helps!
by Abhi Vempati 2H
Wed Jan 22, 2020 4:02 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes: endothermic vs exothermic
Replies: 1
Views: 2

Re: Phase changes: endothermic vs exothermic

Yes, the reverse reactions (condensation, freezing, and deposition) would be exothermic because they release energy, forming a more stable phase of matter.
by Abhi Vempati 2H
Wed Jan 22, 2020 4:00 pm
Forum: Phase Changes & Related Calculations
Topic: Temp in sublimation
Replies: 1
Views: 2

Re: Temp in sublimation

While a substance is undergoing sublimation, all the energy (from the heat) is being used to break the IMFs that hold the solid together. Therefore, the temperature (which is the average kinetic energy of the molecules) does not change. During sublimation, the heat doesn't make the molecules move fa...
by Abhi Vempati 2H
Sat Jan 18, 2020 5:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH sig figs
Replies: 5
Views: 35

Re: pH sig figs

This link on the Chem 14B website (titled "Everything you want to know about Significant Figures") was really helpful for me: https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14B/EVERYTHING_YOU_WANTED_TO_KNOW_ABOUT_SF.pdf The second page has the rules for logarithms, and I hop...
by Abhi Vempati 2H
Sat Jan 18, 2020 5:23 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: Buffer questions
Replies: 4
Views: 17

Re: Buffer questions

Professor Lavelle said that everything up until the end of Friday was fair game for the test, and since we had a buffer example in class that day, there's a chance that it may be on the test. Hope this helps!
by Abhi Vempati 2H
Sat Jan 18, 2020 5:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Fall Quarter Final
Replies: 2
Views: 18

Re: Fall Quarter Final

Like @asannajust_1J mentioned, there might be an email sent out, but if not, I would just drop by on Tuesday or later to check it out. Hope this helps!
by Abhi Vempati 2H
Sat Jan 18, 2020 5:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Exercise 6A.19
Replies: 4
Views: 37

Re: Exercise 6A.19

I believe the correct answer is 3.2 x 10-15 M.

In the solutions manual, the [H3O+] = 3.1 x 10-3 M, but in our book, it's just 3.1 M, leading to a different answer. Hope this helps!
by Abhi Vempati 2H
Sat Jan 18, 2020 5:00 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Test 1
Replies: 6
Views: 19

Re: Test 1

Professor Lavelle mentioned at the end of class on Friday that it was only chemical equilibrium + acids and bases, so basically everything we covered in the first two weeks. Hope this helps!
by Abhi Vempati 2H
Thu Jan 09, 2020 4:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants with Ionic Compounds
Replies: 2
Views: 16

Re: Equilibrium Constants with Ionic Compounds

When the book says the "activity", it simply means the concentration/partial pressures. As stated in lecture, we approximate the activity by using the concentrations or partial pressures of the species in the reaction. So, all we need to do is write the expression for K like you would norm...
by Abhi Vempati 2H
Thu Jan 09, 2020 4:04 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Why is K unitless?
Replies: 10
Views: 33

Re: Why is K unitless?

We use reactivity to calculate K, and concentrations/partial pressures are just an approximation of the reactivities. Reactivities have no units, so K will therefore not have any units. This was covered in the modules and lectures in further detail. Hope this helps!
by Abhi Vempati 2H
Thu Jan 09, 2020 4:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp v. Kc
Replies: 5
Views: 16

Re: Kp v. Kc

After asking this question in office hours yesterday, Professor Lavelle said that if the problem simply asks you to write the expression for K for a reaction with only gases, you can use K p . However, he did make it explicitly clear that K is just a general term for either K c or K p , so it doesn'...
by Abhi Vempati 2H
Thu Jan 09, 2020 3:56 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: determining shift in equilibrium
Replies: 4
Views: 24

Re: determining [censored] in equilibrium

Yes, you need to take the ΔH into account. Since ΔH < 0, the forward reaction is exothermic and the reverse reaction is endothermic. In other words, the forward reaction gives off heat and the reverse reaction uses up heat. Since heat is added, Le Chatelier's Principle states that the system will tr...
by Abhi Vempati 2H
Thu Jan 09, 2020 3:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to assume x=0 for ICE box problems
Replies: 1
Views: 16

Re: When to assume x=0 for ICE box problems

You can make this assumption whenever K < 10 -4 , as stated in Professor Lavelle's modules. Since the value of K is extremely small, we know that only a very, very tiny amount of product will be formed. In other words, only a very, very tiny amount of reactant is used up. So, when subtracting x (the...
by Abhi Vempati 2H
Wed Dec 04, 2019 12:25 pm
Forum: Amphoteric Compounds
Topic: amphoteric oxides
Replies: 3
Views: 16

Re: amphoteric oxides

As everyone is mentioning, it would probably be useful to know the amphoteric oxides themselves, which is something you have to memorize. It's in the textbook (page 450), and he may ask us questions about them on the final. Hope this helps!
by Abhi Vempati 2H
Wed Dec 04, 2019 12:10 pm
Forum: Air Pollution & Acid Rain
Topic: Acid rain eqn
Replies: 1
Views: 39

Re: Acid rain eqn

i. SO2 (aq) + H2O (l) H2SO3 (aq)

ii. CO2 (aq) + H2O (l) H2CO3 (aq)

I believe these are the two reactions we need to know for acid rain. Hope this helps!
by Abhi Vempati 2H
Wed Dec 04, 2019 9:33 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: week 9 hw problems
Replies: 4
Views: 48

Re: week 9 hw problems

I think Week 9 HW should include at least some coordination compound problems (Week 9 was mainly when we covered this topic), but I also did some acid-base problems for Week 9. Week 10 should definitely be acids and bases, though. Hope this helps!
by Abhi Vempati 2H
Wed Dec 04, 2019 9:18 am
Forum: Coordinate Covalent Bonds
Topic: When do we use the prefixes bis, tris, tetrakis, etc?
Replies: 4
Views: 52

Re: When do we use the prefixes bis, tris, tetrakis, etc?

When a ligand is polydentate and you have more than one of these ligands, you use bis-, tris-, etc. This is done because some polydentate ligands already have the prefixes di-, tri-, etc. in them (ex: di ethylene tri amine). By using bis-, tris-, and the alternate prefixes, you can clearly show how ...
by Abhi Vempati 2H
Thu Nov 28, 2019 11:59 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Test #2 handback
Replies: 11
Views: 72

Re: Test #2 handback

I had my discussion on Wednesday and got my test back, so I'm assuming that everyone who had discussion on Monday, Tuesday, and Wednesday received their tests. If you have discussion on Thursday or Friday, you'll most likely get it back in discussion next week or after a lecture (either Monday or We...
by Abhi Vempati 2H
Thu Nov 28, 2019 11:54 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Week 9 homework
Replies: 11
Views: 85

Re: Week 9 homework

Most TAs are collecting Week 9 and Week 10 HW together during their discussions next week. As @NRobbins_1K also mentioned, Professor Lavelle sent out an email saying that we would have the option of turning in Week 9 HW during Week 10 discussion.
by Abhi Vempati 2H
Thu Nov 28, 2019 11:51 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Final Exam
Replies: 10
Views: 84

Re: Final Exam

The final will be cumulative, but it will probably focus a bit more on the second half of the quarter because the first half was tested extensively during the midterm. However, I would still study everything carefully to be prepared. Hope this helps!
by Abhi Vempati 2H
Thu Nov 28, 2019 11:48 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strength and Weakness
Replies: 12
Views: 314

Re: Strength and Weakness

Would the pKa and Ka values be given or would we have to calculate that ourselves? You only need one value to make the comparison, so if you're given either the K a or pK a , you can tell which one is the stronger acid. However, sometimes you may not be given either of these values. If this is the ...
by Abhi Vempati 2H
Thu Nov 28, 2019 11:38 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Test Questions?
Replies: 2
Views: 42

Re: Test Questions?

In addition to naming, Professor Lavelle also could ask us about the shape and coordination number of the coordination complex. He may ask us which ligands are polydentate, and as @Vincent Leong 1A mentioned, he could also ask us about their biological importance.
by Abhi Vempati 2H
Wed Nov 20, 2019 3:21 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: intermolecular repulsions
Replies: 2
Views: 22

Re: intermolecular repulsions

I took my test today and nothing related to intermolecular repulsions was there, so you should be good.
by Abhi Vempati 2H
Wed Nov 20, 2019 3:14 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: London forces vs. dipole-dipole for halogen-containing molecules
Replies: 3
Views: 31

Re: London forces vs. dipole-dipole for halogen-containing molecules

To expand upon @Brittney Hun 1K and clarify a couple of things, both CHF 3 and CHI 3 exhibit dipole-dipole forces, so this doesn't matter in determining the melting/boiling points. What matters, therefore, is the LDFs of each molecule. CHI 3 is a larger molecule/has a higher molar mass, and this cor...
by Abhi Vempati 2H
Wed Nov 20, 2019 3:07 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Compound Arrangement
Replies: 2
Views: 21

Re: Compound Arrangement

Like @Caitlyn Tran 1G mentioned, there's no specific reason or time where you need to write the ammonia backwards. It's just a clarification thing, so you won't need to memorize when you would need to write a molecule backwards.
by Abhi Vempati 2H
Wed Nov 20, 2019 1:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Do we need to know the pentagonal bipyramidal model for Test 2?
Replies: 6
Views: 46

Re: Do we need to know the pentagonal bipyramidal model for Test 2?

After asking my TA and also taking the test, I can confidently say that no, we won't need to know it. Hope this helps!
by Abhi Vempati 2H
Wed Nov 20, 2019 1:46 pm
Forum: Lewis Structures
Topic: Strength of bonds
Replies: 3
Views: 49

Re: Strength of bonds

HO- is more tightly bound because the oxygen has a smaller atomic radius, so the nuclear forces of attraction are much stronger and pull the electrons more tightly. The high electronegativity of oxygen also leads to this conclusion.
by Abhi Vempati 2H
Thu Nov 14, 2019 10:54 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Electronegativity and Diplole Moments
Replies: 2
Views: 13

Re: Electronegativity and Diplole Moments

If two different atoms are covalently bonded together, the electrons are shared unequally. The more electronegative atom pulls all the electrons closer to itself, making the atom partially negative. Since the electrons are being pulled away most of the time from the less electronegative atom, the le...
by Abhi Vempati 2H
Thu Nov 14, 2019 10:48 am
Forum: Octet Exceptions
Topic: existence of radicals
Replies: 1
Views: 24

Re: existence of radicals

Yes, it is extremely unstable for radicals to exist, which is why they're highly reactive and don't last for a long time. For example the CH3 molecule is a radical, and it easily reacts with another H atom to form CH4, a much more stable molecule.
by Abhi Vempati 2H
Thu Nov 14, 2019 10:42 am
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angles
Replies: 10
Views: 65

Re: bond angles

I'm pretty sure it's just something you have to memorize. For some molecules it's pretty intuitive (ex: since CO 2 is a linear molecule, the bond angle is 180 degrees), but once you get to the more complicated molecules, you just have to memorize them. There's a chart in the textbook/online to help ...
by Abhi Vempati 2H
Thu Nov 14, 2019 10:35 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Hydrogen Bonding
Replies: 2
Views: 16

Re: Hydrogen Bonding

This model wouldn't be able to hydrogen bond even if a carbon had a lone pair. This is because for hydrogen bonding, 1) the H needs to be bonded to a highly electronegative atom, specifically N, O, or F and 2) the N, O, or F has to have a lone pair. Since C 2 H 4 doesn't have an H bonded to an N, O,...
by Abhi Vempati 2H
Thu Nov 14, 2019 10:32 am
Forum: Administrative Questions and Class Announcements
Topic: TEST 2
Replies: 8
Views: 55

Re: TEST 2

Test 2 will most likely cover intermolecular forces, VSEPR and Lewis structures, and whatever we learn during lecture on Friday/Monday. There is a chance that it could be a cumulative test, so I would just ask the TAs to be sure. Hope this helps!
by Abhi Vempati 2H
Fri Nov 08, 2019 3:05 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: Test 2
Replies: 6
Views: 46

Re: Test 2

For future reference, the test and exam schedule is on the Class Website. It's a link titled "Test and Exam Schedule" and it's pretty easy to find. Hope this helps!
by Abhi Vempati 2H
Fri Nov 08, 2019 3:01 pm
Forum: Lewis Structures
Topic: Midterm grades
Replies: 26
Views: 246

Re: Midterm grades

He just announced in the 2 P.M. lecture that we're getting our midterms back on Wednesday during our lectures. Good luck!
by Abhi Vempati 2H
Thu Nov 07, 2019 10:23 pm
Forum: Administrative Questions and Class Announcements
Topic: What homework to turn in per week
Replies: 7
Views: 75

Re: What homework to turn in per week

@Cassandra_1K If you're unsure, you can ask your TA for clarification and I'm sure they'd be happy to answer. Chemistry Community is also a great resource!
by Abhi Vempati 2H
Thu Nov 07, 2019 10:21 pm
Forum: Bond Lengths & Energies
Topic: dissociation energy
Replies: 6
Views: 39

Re: dissociation energy

Like @Daniel Honeychurch 1B mentioned, for Chem 14A, we'll be given the experimental values of the dissociation energies. Professor Lavelle mentioned that we will be calculating dissociation energies in Chem 14B, though.
by Abhi Vempati 2H
Thu Nov 07, 2019 10:15 pm
Forum: Lewis Structures
Topic: Formal Charges
Replies: 15
Views: 65

Re: Formal Charges

The +/- charge doesn't really depend on the central atom. Instead, it depends on the electronegativity of the atoms. You want the most electronegative atom to have a - charge on in, so for something like PO 4 3- , it wouldn't be the P that has a negative formal charge, but rather the oxygens around ...
by Abhi Vempati 2H
Sun Nov 03, 2019 12:51 am
Forum: Bond Lengths & Energies
Topic: bond length
Replies: 6
Views: 64

Re: bond length

As everyone has mentioned, there is probably a way to find the exact bond length (in angstroms) based on its strength or vice versa, but I believe that's beyond the scope of this course. I think the main thing we need to know is the relationship between bond length and strength – the longer the bond...
by Abhi Vempati 2H
Sun Nov 03, 2019 12:47 am
Forum: Properties of Light
Topic: Equations
Replies: 4
Views: 27

Re: Equations

The reference sheet is probably going to be exactly the same as the one we got for Test 1, so you could look at that for reference while preparing. Hope this helps!
by Abhi Vempati 2H
Sun Nov 03, 2019 12:41 am
Forum: Dipole Moments
Topic: Dipole Moments on Lewis Structures
Replies: 2
Views: 26

Re: Dipole Moments on Lewis Structures

As @AGulati_4A mentioned, drawing the "slightly negative" and "slightly positive" symbols along with the vectors indicate a dipole moment. The vector should start from the slightly positive atom and point toward the slightly negative atom.
by Abhi Vempati 2H
Sun Nov 03, 2019 12:38 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Midterm Q
Replies: 2
Views: 25

Re: Atomic Spectra Midterm Q

Like @Sebastian Lee 1H said, you probably won't need to memorize the exact color, but memorizing the wavelengths for different types of light (UV, visible, X-ray, etc.) would be helpful.
by Abhi Vempati 2H
Sun Nov 03, 2019 12:34 am
Forum: Octet Exceptions
Topic: Expanded Octets
Replies: 1
Views: 24

Re: Expanded Octets

Elements with electrons in the 3p subshell can expand their octets because they have empty 3d orbitals, allowing them to have more than 8 electrons. This is true for the p block in Period 3 and for all elements below Period 3, and we typically see expanded octets occurring in the halogen and noble g...
by Abhi Vempati 2H
Fri Oct 25, 2019 9:22 pm
Forum: Properties of Light
Topic: Hz vs. frequency
Replies: 7
Views: 75

Re: Hz vs. frequency

Hertz (or s-1) is simply the unit for frequency, just like the kilogram is the unit for mass. Every time it asks for the frequency, your response will be with the unit Hz (or MHz, GHz, etc).
by Abhi Vempati 2H
Fri Oct 25, 2019 9:21 pm
Forum: Ionic & Covalent Bonds
Topic: ion charge
Replies: 3
Views: 18

Re: ion charge

@Katherine Wu: Ga is a weird one because it's in Column/Family 3 of the periodic table, meaning it tends to form a 3+ charge. It confused me at first, but then I realized there's two ways to look at this: 1. Look at the family Ga is in. Ga is in Family 13 (or 3A). Then, I looked at the elements abov...
by Abhi Vempati 2H
Fri Oct 25, 2019 9:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Determining values of ml
Replies: 1
Views: 18

Re: Determining values of ml

As Professor Lavelle mentioned during lecture, the values of ml and what orbitals they correspond to are somewhat arbitrary. Typically, if ml = -1, 0, 1 for the p subshell, we make px = -1, py = 0, and pz = 1 because it's convenient and intuitively makes sense. However, I don't think the numbers nee...
by Abhi Vempati 2H
Fri Oct 25, 2019 9:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Calculating Subshells
Replies: 3
Views: 31

Re: Calculating Subshells

The subshells specifically refer to s, p, d, and f, which is what the angular momentum number gives you. Once you get to the magnetic quantum number, you're talking about orbitals, NOT subshells. So, for n = 4, l = 0, 1, 2, and 3, which correspond to s, p, d, and f. The answer is therefore 4s, 4p, 4...
by Abhi Vempati 2H
Fri Oct 25, 2019 9:05 pm
Forum: Photoelectric Effect
Topic: Increasing Light Intensity Photoelectric Effect
Replies: 7
Views: 38

Re: Increasing Light Intensity Photoelectric Effect

Yes – once a sufficient threshold energy is reached (by increasing frequency), the amplitude of the wave does matter. Increasing the amplitude proportionally increases the number of electrons ejected. So, if you double the amplitude, you double the number or electrons ejected, and so on. Hope this h...
by Abhi Vempati 2H
Sat Oct 19, 2019 10:49 pm
Forum: Student Social/Study Group
Topic: Grades
Replies: 18
Views: 193

Re: Grades

Does anyone know if there is a way to calculate our grades ourselves? Is it point system? The grading system is point-based, but as Professor Lavelle states on the syllabus, letter grades aren't assigned until the very end. I don't think there's a way to know what letter you have, but you can estim...
by Abhi Vempati 2H
Sat Oct 19, 2019 10:37 pm
Forum: Student Social/Study Group
Topic: Homework for Week 4
Replies: 4
Views: 43

Re: Homework for Week 4

Since the material we're covering in class still relates to The Quantum World, yes, you can still do problems from this unit.
by Abhi Vempati 2H
Sat Oct 19, 2019 6:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Tips for the Midterm
Replies: 10
Views: 69

Re: Tips for the Midterm

Like MTanikella_1C mentioned, the video modules, specifically the post-assessments, are pretty useful because they ask both conceptual questions and questions that require you to apply a formula. Reviewing them once or twice should help!
by Abhi Vempati 2H
Sat Oct 19, 2019 6:25 pm
Forum: *Shrodinger Equation
Topic: Review
Replies: 4
Views: 48

Re: Review

The Schrodinger wave function was covered briefly in the modules, but I believe that for topics we are now doing in class (quantum numbers, electron configurations, Lewis dot diagrams, etc), there are no modules for it on the Chem 14A website.
by Abhi Vempati 2H
Sat Oct 19, 2019 6:21 pm
Forum: General Science Questions
Topic: Midterm
Replies: 3
Views: 55

Re: Midterm

Adding onto this, the syllabus mentioned that one homework problem would be on the midterm exam, so doing all of these problems and reviewing them would probably help.
by Abhi Vempati 2H
Mon Oct 14, 2019 8:24 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2750

Re: Test 1 [ENDORSED]

@Keerthana Sivathasan 4G
Yeah, my TA said today that we'd get it back during our discussion this week.
by Abhi Vempati 2H
Sat Oct 12, 2019 6:06 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Frequency doesn't match energy difference
Replies: 2
Views: 76

Re: Frequency doesn't match energy difference

Yes, the light simply passes through the object. Professor Lavelle mentioned this briefly in class.
by Abhi Vempati 2H
Sat Oct 12, 2019 6:00 pm
Forum: DeBroglie Equation
Topic: Crossing out units
Replies: 3
Views: 31

Re: Crossing out units

As @Akshay Chellappa 1H mentioned, the numerator term for the equation has the units J * s. Although J is kg * m^2 * s^-2, the J will be multiplied by the s to cancel out part of the s^-2, making the numerator kg * m^2 * s^-1 (Note the s^-1 instead of the s^-2). Then, the overall fraction will be (k...
by Abhi Vempati 2H
Sat Oct 12, 2019 5:52 pm
Forum: Trends in The Periodic Table
Topic: Chemistry Community
Replies: 8
Views: 79

Re: Chemistry Community

@Matt Sanruk 4F: I believe Professor Lavelle and his TAs have probably figured a system out. Although I don't know how it works exactly, he's been using this system for quite a while and I trust that he knows what he's doing. I think as long as we do the 5 posts by every Sunday, we should be fine.
by Abhi Vempati 2H
Sat Oct 12, 2019 5:47 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons
Replies: 4
Views: 44

Re: Wave Properties of Electrons

As many people here are stating, electrons were determined to have wave-like properties due to the diffraction patterns created during the double slit and screen experiment. It was known that diffraction patterns were a key characteristic of waves, so when the experiment resulted in diffraction patt...
by Abhi Vempati 2H
Sat Oct 12, 2019 5:37 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2750

Re: Test 1 [ENDORSED]

Like @Rebecca Remple 1J said, we should probably getting them back by the next discussion or by the end of next week (according to the TAs). Worst case, we get them during discussion in Week 4.
by Abhi Vempati 2H
Wed Oct 02, 2019 3:41 pm
Forum: Balancing Chemical Reactions
Topic: Combustion [ENDORSED]
Replies: 3
Views: 60

Re: Combustion [ENDORSED]

Like @megan3j said, there will always be carbon dioxide and water as products in combustion reactions. There will also always be oxygen (diatomic form) as a reactant. There may also be some additional elements in the combustion reaction (e.g. nitrogen). However, for these problems, you probably will...
by Abhi Vempati 2H
Wed Oct 02, 2019 3:36 pm
Forum: Significant Figures
Topic: Rounding the elements
Replies: 12
Views: 114

Re: Rounding the elements

I round to the hundredths place, but using Lavelle's IUPAC periodic table definitely helps with fixing inconsistencies when checking answers in the solution manual. I also think that because we all get the same periodic table during exams, we don't have to worry too much about these inconsistencies ...
by Abhi Vempati 2H
Wed Oct 02, 2019 3:24 pm
Forum: Significant Figures
Topic: Calculators
Replies: 20
Views: 696

Re: Calculators

I did some research on scientific calculators and settled on the TI-36X Pro, but I've heard the TI-30X also works great. I personally preferred the 36 because it seems to be slightly more advanced, but I don't think there's a huge difference between the two. Good luck!
by Abhi Vempati 2H
Wed Oct 02, 2019 3:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 130
Views: 2946

Re: Advice from a Medical Student - Part II [ENDORSED]

Thank you for sharing your story and offering to help us premeds out! If I may ask, did you use a counselor to help guide you through UCLA? It's unfortunate that we don't have enough pre-health counselors, and I was wondering if you or anyone you know has sought out a private counselor. If they did,...
by Abhi Vempati 2H
Wed Oct 02, 2019 3:15 pm
Forum: Significant Figures
Topic: Answer is a little off?
Replies: 4
Views: 49

Re: Answer is a little off?

@LBacker_4F put it perfectly. I'd like to add that when I'm showing my work on my paper, I like to round off in order to keep track of the number of sig figs I'll have in my final answer. However, on my calculator, I keep everything unrounded to have a more accurate answer.

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