Search found 95 matches

by Shruti Kulkarni 2I
Sat Feb 20, 2021 7:22 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Adiabatic
Replies: 25
Views: 59

Re: Adiabatic

Adiabatic means no heat is exchanged between the system and its surroundings.
by Shruti Kulkarni 2I
Sat Feb 20, 2021 7:22 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Free Energy
Replies: 41
Views: 130

Re: Free Energy

A state function only depends on the final and initial values, it doesn't care about the "path" taken to get there. Free energy is a state function because it follows these restrictions.
by Shruti Kulkarni 2I
Sat Feb 20, 2021 7:20 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Delta G and G naught
Replies: 37
Views: 91

Re: Delta G and G naught

Delta G naught is the standard reaction Gibbs free energy. If the reaction is not occurring at standard conditions, then regular gibbs free energy is used, which takes into account variations in the temperature, pressure, and anything else.
by Shruti Kulkarni 2I
Sat Feb 20, 2021 7:15 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy related to Enthalpy
Replies: 12
Views: 44

Re: Entropy related to Enthalpy

It's referencing Gibbs Free Energy! This shows that delta G = delta H - T delta S
by Shruti Kulkarni 2I
Sat Feb 20, 2021 7:14 pm
Forum: Student Social/Study Group
Topic: Post Midterm 2 De-stressing
Replies: 90
Views: 240

Re: Post Midterm 2 De-stressing

I'm going to be talking with my friends and catching up on all the hw for the week :D
by Shruti Kulkarni 2I
Sat Feb 20, 2021 7:13 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U and Delta H
Replies: 12
Views: 43

Re: Delta U and Delta H

Delta U = Delta H + w, since delta H = q at a constant pressure.
by Shruti Kulkarni 2I
Sun Feb 14, 2021 3:10 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Temperature and K
Replies: 14
Views: 34

Re: Temperature and K

Temperature can be measured in Kelvin if that is the K you are talking about. If you are talking about the equilibrium constant, k then changes in temperature will change the equilibrium constant for the reaction. If the reaction is endothermic, adding heat will shift the direction towards the produ...
by Shruti Kulkarni 2I
Sun Feb 14, 2021 3:06 pm
Forum: Student Social/Study Group
Topic: Fav Shows of the Moment
Replies: 101
Views: 234

Re: Fav Shows of the Moment

I love to binge New Girl. I've watched it like 10 times!
by Shruti Kulkarni 2I
Sun Feb 14, 2021 3:05 pm
Forum: General Science Questions
Topic: Sapling HW Week 5&6 Question #7
Replies: 4
Views: 36

Re: Sapling HW Week 5&6 Question #7

The enthalpy for the reaction is given by the heater, which is running at 500 W (J/s). So, you would convert the W into J by multiplying by the 4.02 minutes over which each compound boils, as that would reference the time in which the compound is vaporized. This is the enthalpy in the reaction. Then...
by Shruti Kulkarni 2I
Sun Feb 14, 2021 2:54 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Sapling Week 5/6 Q#8
Replies: 5
Views: 48

Re: Sapling Week 5/6 Q#8

I think it is important to note that two different heat capacities are given, and as we do not know how to use both in the same equation, it can be assumed that you would need to take it in steps. Also, as it is a heating and vaporization problem, the process of doing two things would probably indic...
by Shruti Kulkarni 2I
Sun Feb 14, 2021 2:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Content
Replies: 18
Views: 103

Re: Midterm 2 Content

The midterm covers up until Friday, 2/12's lecture. So, the lectures during the midterm week do not count towards the midterm and, as it is not cummulative, nothing covered in the previous midterm will show up as well.
by Shruti Kulkarni 2I
Sun Feb 14, 2021 2:48 pm
Forum: Administrative Questions and Class Announcements
Topic: cc update
Replies: 23
Views: 125

Re: cc update

I think Dr. Lavelle mentioned that he has to put in the points manually, so it isn't an accurate reflection until he updates them. Just wait it out!
by Shruti Kulkarni 2I
Sun Feb 14, 2021 2:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Can We Review our Exams?
Replies: 69
Views: 245

Re: Can We Review our Exams?

I would assume that the same format would follow from 14A where the TA's could go over your exam questions with you. You would have to go to a TA's office hours and ask them to see if they'll go over your midterm with you.
by Shruti Kulkarni 2I
Wed Feb 03, 2021 10:22 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: U and E
Replies: 7
Views: 20

Re: U and E

U and E are extensive properties! They depend on the number of molecules are in the system.
by Shruti Kulkarni 2I
Wed Feb 03, 2021 10:18 pm
Forum: Calculating Work of Expansion
Topic: Negative Work
Replies: 19
Views: 67

Re: Negative Work

When work is being done to a system, the work will be positive and if work is being done by the system, the work will be negative.
by Shruti Kulkarni 2I
Wed Feb 03, 2021 10:16 pm
Forum: Ideal Gases
Topic: Exo vs Endothermic
Replies: 30
Views: 109

Re: Exo vs Endothermic

Since forming bonds requires energy and breaking bonds loses energy, you can determine if it's exo or endothermic based on if bonds are being created or destroyed. If a bond is being created, it probably is endothermic because making a bond requires energy, and if a bond is being broken, it is proba...
by Shruti Kulkarni 2I
Wed Feb 03, 2021 10:11 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Solving for Cubic Equations
Replies: 13
Views: 33

Re: Solving for Cubic Equations

You can make x negligible for any equation where the k value is very small. It is not limited to just cubic equations.
by Shruti Kulkarni 2I
Wed Feb 03, 2021 10:10 pm
Forum: Ideal Gases
Topic: Chem BL
Replies: 90
Views: 400

Re: Chem BL

I am definitely thinking about taking BL next quarter, simply because I wanted to learn all of the 14B material before diving straight in. I am wondering if taking it with Chem 14C is a good idea though, because of how hard Organic Chemistry is supposed to be. Also, having an online lab seems diffic...
by Shruti Kulkarni 2I
Sat Jan 30, 2021 11:42 pm
Forum: General Science Questions
Topic: Careless Mistakes
Replies: 54
Views: 240

Re: Careless Mistakes

Honestly, the only way to improve this is to slow down and double-check everything you are doing very thoroughly. You should also be thinking about what your calculator outputs and if it makes sense for the scenario as a whole, and if it doesn't then look through and see what mistake you could have ...
by Shruti Kulkarni 2I
Sat Jan 30, 2021 11:40 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: perfect system
Replies: 20
Views: 77

Re: perfect system

It means that the heat of the object's surroundings is equivalent to the heat of the object. So if the object lost energy to its surroundings, the surroundings would gain that same amount of energy.
by Shruti Kulkarni 2I
Sat Jan 30, 2021 11:38 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: change in celsius = change in kelvin
Replies: 22
Views: 95

Re: change in celsius = change in kelvin

Kelvin is a Celsius plus 273. So, for every one-unit increase in Celsius, there will be a one-unit increase in Kelvin as well.
by Shruti Kulkarni 2I
Sat Jan 30, 2021 11:37 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: steam causing burns
Replies: 40
Views: 154

Re: steam causing burns

Yes! When the steam touches something cooler, in this case, your skin, it condensates and therefore loses all the energy it gained in order to become and transferring it into your skin. This would cause you a much more severe burn in comparison to just water at 100 degrees, as it is also releasing a...
by Shruti Kulkarni 2I
Sat Jan 30, 2021 11:35 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Clarification about Solids & Liquids for Le Chateliers Principle
Replies: 7
Views: 62

Re: Clarification about Solids & Liquids for Le Chateliers Principle

Yes! Since solids and liquids are not included in the k constant, changing their concentrations should not have an impact on the equilibrium of a system. However, remember to look out for aqueous solutions, because if the volume of the solvent is increased by a lot then it is possible that the conce...
by Shruti Kulkarni 2I
Sun Jan 24, 2021 7:51 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: pH of weak acid
Replies: 9
Views: 39

Re: pH of weak acid

We can assume that x is insignificant usually when Ka < 10^-4, or when x is less than 5% of the initial amount of the acid/base. We can assume x is insignificant because it is so small it will barely impact the overall concentration of the acid.
by Shruti Kulkarni 2I
Sun Jan 24, 2021 7:49 pm
Forum: Phase Changes & Related Calculations
Topic: Salt
Replies: 19
Views: 48

Re: Salt

Salts can be acidic, basic, or neutral. If there is a salt with a cation from a strong base and an anion from a weak acid, the salt will be basic as the anion will draw a proton from water, forming OH- ions. If there is a salt with a cation from a weak base and an anion from a strong acid, the salt ...
by Shruti Kulkarni 2I
Sun Jan 24, 2021 7:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Diatomic Molecules
Replies: 6
Views: 23

Re: Diatomic Molecules

I believe that any molecule with two atoms is considered diatomic. The diatomic elements are those that can form diatomic molecules with themselves.
by Shruti Kulkarni 2I
Sun Jan 24, 2021 7:10 pm
Forum: Student Social/Study Group
Topic: Favorite Music
Replies: 104
Views: 295

Re: Favorite Music

I like listening to lowfi music or sometimes I use the instrumental versions of songs I like!
by Shruti Kulkarni 2I
Sun Jan 24, 2021 7:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: How to tell if a salt is acidic, basic or neutral
Replies: 7
Views: 60

Re: How to tell if a salt is acidic, basic or neutral

You have to look at the ions it is composed of! If the salt is made of a cation of a strong base and the anion of a weak acid, the salt itself would make the solution basic as the anion would steal a proton from water and leave OH- behind. In contrast, if it is made of a cation of a weak base and th...
by Shruti Kulkarni 2I
Sat Jan 16, 2021 6:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: sapling homework #2
Replies: 5
Views: 40

Re: sapling homework #2

You can get the equilibrium value of O2, as you know the moles of O2 at equilibrium and the volume of the container. Using the moles of O2 at equilibrium, you can use stoichiometry to find the moles of SO2 and SO3 present at equilibrium in the reaction. When you have those values, you can divide the...
by Shruti Kulkarni 2I
Sat Jan 16, 2021 6:12 pm
Forum: Ideal Gases
Topic: Kc vs. Kp
Replies: 31
Views: 124

Re: Kc vs. Kp

You're right that solving for Kc and Kp is the same. Kp uses partial pressures while Kc uses concentrations. If you want to convert between the pressure to the concentration you can use PV = nRT, as n/V is concentration.
by Shruti Kulkarni 2I
Sat Jan 16, 2021 6:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: hw question #3
Replies: 10
Views: 70

Re: hw question #3

You can multiply both sides by (0.7 -x)^2 to remove the denominator and then expand each expression to create an equality. Afterward, you can move all the terms to one side and set the equation equal to zero. All that's left is to solve using the quadratic equation or even graphing out the equation ...
by Shruti Kulkarni 2I
Sat Jan 16, 2021 6:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH of Weak Acids
Replies: 11
Views: 75

Re: pH of Weak Acids

I think you need to remember that pH is just a measure of the H3O+ concentration in the solution, so when you dissolve the acids in the solution, it measures how many H3O+ ions are in the solution afterward. However, this is very relative with different concentrations of acids, weak or strong. The m...
by Shruti Kulkarni 2I
Sat Jan 16, 2021 6:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: HW Question
Replies: 8
Views: 51

Re: HW Question

Hi! So you're just supposed to play around with the equations and their k constants to find the k constant of the original equation. Personally, I inversed the N2(g)+3H2(g)↽−−⇀2NH3(g) equation, which would mean that you would inverse the k constant by doing 1/k. Then, I used I2(g)↽−−⇀2I(g) and multi...
by Shruti Kulkarni 2I
Sat Jan 09, 2021 10:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q and K
Replies: 13
Views: 57

Re: Q and K

Yes, that is correct. K is just Q when the products are at equilibrium, so you can use Q as a measure of determining which way the reaction will move. When K>Q, the reaction will shift towards the products, and if K< Q, the reaction will shift towards the reactants.
by Shruti Kulkarni 2I
Sat Jan 09, 2021 10:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentration
Replies: 12
Views: 83

Re: Concentration

Concentrations cannot be negative because it is defined by moles/L. As it is impossible to have a negative number of moles or a negative number of L, the concentration must be positive.
by Shruti Kulkarni 2I
Sat Jan 09, 2021 10:13 pm
Forum: Student Social/Study Group
Topic: New Year Resolutions?
Replies: 54
Views: 224

Re: New Year Resolutions?

I want to start working out a bit more as well as journaling my days so I remember the things that I did in the future!
by Shruti Kulkarni 2I
Sat Jan 09, 2021 10:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 #6
Replies: 6
Views: 67

Re: Sapling Week 1 #6

I agree with what was said above, you cubed the 1.75 when it should be squared!
by Shruti Kulkarni 2I
Sat Jan 09, 2021 10:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Lecture Format
Replies: 22
Views: 130

Re: Lecture Format

I think it follows the same format as 14A where the lectures were recorded and posted under the media tab on CCLE. I assume we would be informed via email if anything was synchronous!
by Shruti Kulkarni 2I
Sat Jan 09, 2021 9:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling Problem: Used non-UCLA email address for previous quarter
Replies: 5
Views: 51

Re: Sapling Problem: Used non-UCLA email address for previous quarter

I would agree with using chrome! It seems that sapling just operates better with chrome than any other browser so maybe use it instead.
by Shruti Kulkarni 2I
Sat Dec 12, 2020 10:24 pm
Forum: Calculating the pH of Salt Solutions
Topic: weak acid/base and pH
Replies: 9
Views: 181

Re: weak acid/base and pH

Yep! This happens cuz weak acids have pH's lower than 7 and weak bases have pH's over 7, so they usually will be lowering or raising the pH.
by Shruti Kulkarni 2I
Sat Dec 12, 2020 10:20 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa and pH
Replies: 2
Views: 21

Re: pKa and pH

I think you should know that if the pKa < pH, then the majority of atoms in the solution will be charged for acids. However, if the pKa > pH, then the majority of atoms in the solution will be neutral, for acids. The inverse is true for bases. Also, you should know that the pKa value being low indic...
by Shruti Kulkarni 2I
Sat Dec 12, 2020 10:17 pm
Forum: General Science Questions
Topic: bond angles
Replies: 3
Views: 37

Re: bond angles

Yes, you can just say less than or slightly less than to indicate the bond angles. I don't think we are expected to know exactly the angles of the bonds in the presence of lone pairs.
by Shruti Kulkarni 2I
Sat Dec 12, 2020 10:14 pm
Forum: Hybridization
Topic: hybrid orbitals
Replies: 4
Views: 17

Re: hybrid orbitals

It just depends on the level of specification you want! If you wanna tell the energy level as well as the hybridization of the orbital, you would put the 2. But sp^3 is equally correct if you are not specifying the energy level.
by Shruti Kulkarni 2I
Sat Dec 12, 2020 10:13 pm
Forum: Naming
Topic: Cobalt vs Cobaltate
Replies: 12
Views: 79

Re: Cobalt vs Cobaltate

You add the -ate to the TM when the charge of the coordination compound is negative to signal that the compound is negative. If the charge is neutral or positive, you will leave it as the metal, like cobalt.
by Shruti Kulkarni 2I
Sat Dec 05, 2020 7:14 pm
Forum: Naming
Topic: Order of Ligands/naming
Replies: 28
Views: 146

Re: Order of Ligands/naming

You would name the ligands in alphabetical order, not including the prefixes, and then put the transition metal at the end, followed by whatever was not in the brackets.
by Shruti Kulkarni 2I
Sat Dec 05, 2020 7:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 21
Views: 162

Re: Final

I believe they'll be very similar otherwise we would have been informed. I would suspect it would once again be on a lockdown browser with a second device on a zoom call.
by Shruti Kulkarni 2I
Sat Dec 05, 2020 7:07 pm
Forum: Naming
Topic: naming sphere of influence
Replies: 5
Views: 22

Re: naming sphere of influence

Hi! In this example, the second Cl is not directly bonded to the TM cation but instead bonded to the coordination compound that is formed. This would cause it to be outside the sphere of influence for the cation, and so its name wouldn't be changed in regards to being in the sphere of influence.
by Shruti Kulkarni 2I
Sat Dec 05, 2020 7:04 pm
Forum: Lewis Structures
Topic: Most Stable Structure
Replies: 23
Views: 154

Re: Most Stable Structure

The most stable structure will have the lowest formal charge. If there must be a charge, it is most stable if the most electronegative atom holds the negative charge.
by Shruti Kulkarni 2I
Sat Dec 05, 2020 7:01 pm
Forum: Lewis Acids & Bases
Topic: Bronsted vs. Lewis bases
Replies: 11
Views: 73

Re: Bronsted vs. Lewis bases

From what Dr. Lavelle said during the lecture, a Bronsted base and a lewis base are the same, it is just the way you observe them that's different. In terms of a Bronsted base, you would observe it from the actions of the protons, as it will receive a proton, in comparison to Lewis bases which will ...
by Shruti Kulkarni 2I
Sat Dec 05, 2020 6:58 pm
Forum: Naming
Topic: Naming Order
Replies: 16
Views: 90

Re: Naming Order

From what I have seen, it appears that you would put the TM cation first and then put the ligands after it. I do not think the ligands need to be in alphabetical order but it couldn't hurt to follow that convention.
by Shruti Kulkarni 2I
Sat Nov 28, 2020 8:35 pm
Forum: Sigma & Pi Bonds
Topic: sapling #15
Replies: 24
Views: 138

Re: sapling #15

You look at the number of bonds for the atom. If it's a single bond, it is just one sigma bond. Double bonds will contain one sigma bond and one pi bond and triple bonds will contain one sigma bond and two pi bonds. Basically, there is only ever one sigma bond, the rest of them have to be pi bonds.
by Shruti Kulkarni 2I
Sat Nov 28, 2020 8:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 17
Views: 75

Re: Polarity

Hi! If the structure is symmetric, with the same kinds of atoms evenly spaced out then the molecule will be nonpolar. However, if the structure isn't symmetric and there are different atoms on each side, then the structure will be polar. This includes lone pairs, as if the structure is symmetric wit...
by Shruti Kulkarni 2I
Tue Nov 24, 2020 12:17 am
Forum: Hybridization
Topic: e density
Replies: 30
Views: 170

Re: e density

Yes! Every bond and lone pair is an area of electron density. However, double and triple bonds do not count as separate areas of electron density but instead are a single area of electron density.
by Shruti Kulkarni 2I
Tue Nov 24, 2020 12:12 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: isoelectronic
Replies: 12
Views: 92

Re: isoelectronic

Hi! Isoelectronic means that the atoms have the same amount of electrons. For example, O2-, F1- and Ne are isoelectric as they all have 10 electrons. From my understanding, isoelectronic atoms share similar properties, so knowing that they are isoelectronic can help you in understanding the properti...
by Shruti Kulkarni 2I
Mon Nov 23, 2020 11:47 am
Forum: Resonance Structures
Topic: Resonance implying electron delocalization?
Replies: 5
Views: 79

Resonance implying electron delocalization?

In Dr. Lavelle's lecture today he mentioned that in the case of Benzene, the carbon will form three hybrid orbitals and keep one normal p orbital. He then said that the electron in the remaining p orbitals of each carbon will be delocalized and shared equally among the carbons. I was wondering if th...
by Shruti Kulkarni 2I
Mon Nov 23, 2020 11:42 am
Forum: Hybridization
Topic: Why are lone pairs hybridized?
Replies: 4
Views: 58

Re: Why are lone pairs hybridized?

Hi! From my understanding, I think that they contribute as they are a region of electron density around the central atom and contribute to the octet of the central atom, so they must be taken into account when forming hybrid orbitals as they impact the shape of the molecule.
by Shruti Kulkarni 2I
Sun Nov 22, 2020 12:14 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair E-
Replies: 47
Views: 309

Re: Lone Pair E-

Yes, they do! Lone pair electrons count as another region of electron density. In fact, they often have a larger electron density than a bond!
by Shruti Kulkarni 2I
Sun Nov 22, 2020 12:11 am
Forum: Lewis Structures
Topic: Sapling Hw #12
Replies: 3
Views: 47

Re: Sapling Hw #12

Yea! Just use the mass percentage to determine the empirical formula, and then divide by the molar mass to find the molecular formula. Then you can make a lewis structure of the molecular formula.
by Shruti Kulkarni 2I
Sat Nov 21, 2020 11:43 pm
Forum: Ionic & Covalent Bonds
Topic: Radicals
Replies: 10
Views: 97

Re: Radicals

Yes, the answer key is most probably wrong. C has 4 electrons and each H has 1 electron, which will result in 7 electrons, implying a radical.
by Shruti Kulkarni 2I
Sat Nov 21, 2020 11:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear shape
Replies: 7
Views: 57

Re: Linear shape

There's a lone pair in NO2- which changes its shape from linear to bent! The lone pair repels the bonds creating the lone pair shape.
by Shruti Kulkarni 2I
Sat Nov 21, 2020 11:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar or Nonpolar
Replies: 13
Views: 244

Re: Polar or Nonpolar

Hi! If the shape is symmetric with the same atoms on each side, it won't be polar. If the same is asymmetric at all or has different atoms at different points, the bond will be polar.
by Shruti Kulkarni 2I
Thu Nov 12, 2020 10:42 pm
Forum: Lewis Structures
Topic: Trouble with question 1 on sapling.
Replies: 3
Views: 18

Re: Trouble with question 1 on sapling.

That's right! The oxygen will have 2 lone pairs and will be double-bonded with C. The hydrogens will be single bonded with the C as well. Maybe double-check and see if the question asks for charges because that could be resulting in your error.
by Shruti Kulkarni 2I
Thu Nov 12, 2020 8:27 pm
Forum: Bond Lengths & Energies
Topic: Sapling HW Bond Length
Replies: 7
Views: 67

Re: Sapling HW Bond Length

Hi! S actually has a larger atomic radius as it has more electrons, which would make the bond length between Si-S longer than that of Si-O. Atomic radii increase down the period! And as S has a larger radius, it will have a longer bond length in comparison to O.
by Shruti Kulkarni 2I
Wed Nov 11, 2020 7:29 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bond Homework Question
Replies: 3
Views: 15

Re: Hydrogen Bond Homework Question

That's right! Hydrogen bonds can only form when hydrogen is bonded to a highly electronegative ion, such as F. The difference in their electronegativities leads to the dipoles that are formed in the molecule which allows for the hydrogen bonds to occur. This is why hydrogen bonds only happen with N,...
by Shruti Kulkarni 2I
Wed Nov 11, 2020 7:26 pm
Forum: Dipole Moments
Topic: Dipole dipole vs LDF
Replies: 10
Views: 71

Re: Dipole dipole vs LDF

Dipole-dipole and LDF forces are similar as they occur from the dipoles of molecules. However, dipole-dipole forces occur in polar atoms/molecules while LDF forces occur spontaneously in any atom/molecule as a result of a shift in its electron density.
by Shruti Kulkarni 2I
Wed Nov 11, 2020 7:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Modules for MD 2 Material?
Replies: 5
Views: 48

Re: Audio-Visual Modules for MD 2 Material?

I don't think there are any more modules for the subjects we are covering and Dr. Lavelle said that he probably won't upload anymore.
by Shruti Kulkarni 2I
Sat Nov 07, 2020 12:03 am
Forum: Resonance Structures
Topic: Bond lengths
Replies: 20
Views: 152

Re: Bond lengths

Hi! I'm pretty sure that the length of the bonds in your Lewis Structures don't matter as long as you conceptually understand that double and triple bonds are shorter and the reasoning behind this.
by Shruti Kulkarni 2I
Sat Nov 07, 2020 12:01 am
Forum: Electronegativity
Topic: Noble Gases
Replies: 40
Views: 2115

Re: Noble Gases

Noble gases are usually left out of periodic table trends as they have a full octet and therefore do not want to gain any or lose any electrons. So, they are not used in periodic table trends such as electronegativity.
by Shruti Kulkarni 2I
Fri Nov 06, 2020 11:57 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Isoelectric atoms
Replies: 9
Views: 38

Re: Isoelectric atoms

Hi! Isoelectric atoms have the same number of electrons (ex. F- and Ne). However, as you can see they will have different charges and different properties overall.
by Shruti Kulkarni 2I
Fri Nov 06, 2020 11:45 pm
Forum: Lewis Structures
Topic: lewis structure
Replies: 17
Views: 50

Re: lewis structure

Hi! So the charge on the outside of the brackets represents the overall charge of the atom or molecule. Usually, you can figure out the charge of the molecule based on the properties of the atoms that make it up. As Dr.Lavelle said in the lecture, you would use the formula (FC = ( S/2 + LP)) to find...
by Shruti Kulkarni 2I
Tue Nov 03, 2020 11:13 pm
Forum: Lewis Structures
Topic: sides
Replies: 12
Views: 137

Re: sides

I don't think it matters at all! As long as your structure is accurate the way you put the atoms should not influence anything.
by Shruti Kulkarni 2I
Mon Nov 02, 2020 10:41 pm
Forum: Trends in The Periodic Table
Topic: # of electrons
Replies: 23
Views: 121

Re: # of electrons

Hi! I agree with the above statements. If you want to find the number of total electrons of the element, you look at the atomic number. And if you want to find the number of valence electrons, you would look at the number of electrons in the s and p orbitals for rows 1-3.
by Shruti Kulkarni 2I
Sat Oct 31, 2020 4:52 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling Homework
Replies: 8
Views: 57

Re: Sapling Homework

That does look like the correct answer. I agree with what is said above about removing the commas! The only other thing I can think of is if you are using the carrots (^) to show the exponents instead of putting the actual exponents. Make sure to use the exponent feature on sapling to actually put e...
by Shruti Kulkarni 2I
Sat Oct 31, 2020 4:46 pm
Forum: Quantum Numbers and The H-Atom
Topic: n and l numbers
Replies: 5
Views: 63

Re: n and l numbers

Hi! Generically, the corresponding orbitals do follow the pattern l = 0 is s, l = 1 is p, l = 2 is d, and l = 3 is f. So, for the 7p^5 example you mentioned, it would have quantum numbers of n = 7 and l = 1, as you are in the p-orbital.
by Shruti Kulkarni 2I
Sat Oct 31, 2020 4:40 pm
Forum: Ionic & Covalent Bonds
Topic: Is ionic or covalent stronger?
Replies: 31
Views: 466

Re: Is ionic or covalent stronger?

I have always been told ionic bonds are the strongest, then covalent bonds, then London forces. I would assume that ionic would be the strongest because the atoms actually give up or gain electrons, they don't share them as is the case with covalent bonds.
by Shruti Kulkarni 2I
Sat Oct 31, 2020 4:38 pm
Forum: Ionic & Covalent Bonds
Topic: lone pairs
Replies: 5
Views: 57

Re: lone pairs

Yes! Lone pairs indicate a higher reactivity as the atom either wants to lose that electron or gain another one in order to have a full orbital or subshell.
by Shruti Kulkarni 2I
Sat Oct 31, 2020 4:34 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Sapling #21
Replies: 3
Views: 50

Re: Sapling #21

Hi! So what helps me in understanding orbitals is to think of them as addresses! You will need to memorize a few properties of the orbitals, for example, that p orbitals have 6 electrons, but when you think of them as addresses it becomes clearer. Think of the energy level, n, as a country. So, anyo...
by Shruti Kulkarni 2I
Mon Oct 26, 2020 11:08 pm
Forum: DeBroglie Equation
Topic: De Broglie wavelength
Replies: 3
Views: 20

Re: De Broglie wavelength

I believe that Dr. Lavelle has stated that objects with a wavelength of 10^-15 m or larger have wavelike properties, and objects with a smaller wavelength do not have discernable wavelike properties as their wavelength is so small it is imperceptible.
by Shruti Kulkarni 2I
Fri Oct 23, 2020 8:21 pm
Forum: DeBroglie Equation
Topic: Sapling #22
Replies: 11
Views: 114

Re: Sapling #22

De Broglie's formula is used to find the velocity of an electron. You cannot immediately use E = hv, as the kinetic energy is a portion of this energy, not all of it. Due to this, you would have to isolate the electron's velocity and then solve for the kinetic energy using the kinetic energy equatio...
by Shruti Kulkarni 2I
Fri Oct 23, 2020 8:18 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 9
Views: 100

Re: Orbitals

Hey! An electron in the 5s state is said to be at the 5th energy level in the s orbital. So, n= 5 and l = 0.
by Shruti Kulkarni 2I
Fri Oct 23, 2020 8:15 pm
Forum: Properties of Light
Topic: Units for wavelength/frequency
Replies: 18
Views: 99

Re: Units for wavelength/frequency

Wavelength is measured in m, or some variety of meters, like nanometers, which will probably be given to us in the problem itself if we need to change the length to nm or do any other conversions. Frequency is measured in Hertz (Hz), which is 1/s. This too can be converted into MHz and similar value...
by Shruti Kulkarni 2I
Fri Oct 23, 2020 8:11 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1386

Re: How are you studying?

Hi! What I tend to do is attempt to practice problems so that I can understand the steps that should be taken to start each solution. By practicing lots of problems, I am able to grasp the overall flow of how to solve them quicker. For more conceptual topics, I take notes on them and then proceed to...
by Shruti Kulkarni 2I
Fri Oct 23, 2020 7:44 pm
Forum: *Black Body Radiation
Topic: Midterm 1
Replies: 15
Views: 295

Re: Midterm 1

He mentioned during lecture that black body radiation is not a concept we need to know!
by Shruti Kulkarni 2I
Sun Oct 18, 2020 7:43 pm
Forum: Photoelectric Effect
Topic: Sapling Homework Question 6
Replies: 1
Views: 48

Sapling Homework Question 6

Hi! I'm having some trouble on Sapling Question 6. The electron in a hydrogen atom is excited to the n=7 shell and emits electromagnetic radiation when returning to lower energy levels. Determine the number of spectral lines that could appear when this electron returns to the lower energy levels, as...
by Shruti Kulkarni 2I
Sat Oct 17, 2020 6:57 pm
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 474

Re: m vs nm

I think that if the question specifically asks for nm, then it's best practice to put the answer in nm. If not, I think either will work!
by Shruti Kulkarni 2I
Thu Oct 15, 2020 11:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm Format
Replies: 12
Views: 143

Re: Midterm Format

Hi!
According to my TA it's going to be multiple choice. I don't know if that's finalized or not but it's what has been told to me.
by Shruti Kulkarni 2I
Thu Oct 15, 2020 10:23 pm
Forum: *Black Body Radiation
Topic: What is Black Body?
Replies: 35
Views: 572

Re: What is Black Body?

Hi!!
Black body radiation is basically radiation that emits and can absorb all frequencies possible! It's a theorized concept but nothing in real life has this property.
by Shruti Kulkarni 2I
Thu Oct 15, 2020 10:09 pm
Forum: Student Social/Study Group
Topic: iPad vs Paper notes
Replies: 32
Views: 410

Re: iPad vs Paper notes

Hi! I am personally using an iPad to take notes and have found it very convenient overall! It is extremely helpful and easy to just erase something or move it somewhere else without any weird marks or arrows. It is also great for adding pictures or diagrams into your notes so that you can reference ...
by Shruti Kulkarni 2I
Mon Oct 12, 2020 6:59 pm
Forum: Properties of Electrons
Topic: protons and electrons
Replies: 33
Views: 216

Re: protons and electrons

Hi! Protons and neutrons have very similar masses, with protons and neutrons having a mass of around 1 amu. Electrons, however, are so small that their mass is infinitesimal in comparison and therefore they are not included in the calculations for molecular mass. Due to this, molecular mass is deter...
by Shruti Kulkarni 2I
Sun Oct 11, 2020 8:04 pm
Forum: Empirical & Molecular Formulas
Topic: Sapling Week 1 #9
Replies: 3
Views: 37

Re: Sapling Week 1 #9

Hi! From my understanding of the question, you should first determine the grams of both carbon and hydrogen in the products, as those are exclusively from the acid. Then, you subtract those from the initial mass of the acid that they give you, giving you the amount of oxygen in grams that is found i...
by Shruti Kulkarni 2I
Fri Oct 09, 2020 11:05 am
Forum: Properties of Light
Topic: Speed of Light in Equations
Replies: 6
Views: 26

Re: Speed of Light in Equations

Yes I think it's fine to make the assumption that it's light in a vacuum as the constant of the equation itself is the speed of light in a vacuum. It is most likely best to continue with this assumption unless it is stated otherwise in the problem.
by Shruti Kulkarni 2I
Fri Oct 09, 2020 10:59 am
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Participation Points
Replies: 5
Views: 52

Re: Chemistry Community Participation Points

Hi! I agree with what has been said above! From how I understand it you should be making five new posts every week in order to get the points. The posts don't necessarily have to be questions but they can be comments or replies to other people's questions!
by Shruti Kulkarni 2I
Thu Oct 08, 2020 3:01 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 231
Views: 118067

Re: Advice from a Medical Student [ENDORSED]

Thank you for this advice! It is helpful to know the importance of learning and understanding concepts now so as to do better in the future!
by Shruti Kulkarni 2I
Thu Oct 08, 2020 2:57 pm
Forum: Molarity, Solutions, Dilutions
Topic: E. 23
Replies: 4
Views: 740

Re: E. 23

Hi Kayla! After finding the molar mass you can convert the grams of UF6 to moles and then do the molar ratio. In every mole of UF6, there will be 6 moles of F ions, since there are 6 F ions in every molecule of UF6. Knowing the molar ratio you can solve for F ions.
by Shruti Kulkarni 2I
Thu Oct 08, 2020 12:57 am
Forum: Balancing Chemical Reactions
Topic: Fractions
Replies: 26
Views: 169

Re: Fractions

I think we need to have whole numbers for the final balanced equation as that's preferred when doing further calculations! Maybe multiply by the denominator on both sides of the equation to get whole numbers!

Go to advanced search