Search found 58 matches

by AGulati_4A
Fri Nov 15, 2019 10:24 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 12
Views: 36

Re: Bond Strength

covalent
by AGulati_4A
Fri Nov 15, 2019 10:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to tell polar or non polar from lewis structure?
Replies: 9
Views: 28

Re: How to tell polar or non polar from lewis structure?

A polar structure has non-cancelling electronegativity vectors while a non-polar structure has cancelling ones.
by AGulati_4A
Fri Nov 15, 2019 10:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: regions of electron density
Replies: 7
Views: 18

Re: regions of electron density

a lone pair in an electron that creates a large negative charge
by AGulati_4A
Fri Nov 15, 2019 10:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Notation
Replies: 5
Views: 19

Re: VSEPR Notation

electron pairs
by AGulati_4A
Fri Nov 15, 2019 10:15 pm
Forum: Amphoteric Compounds
Topic: Question 6A.11
Replies: 1
Views: 64

Re: Question 6A.11

H2CO3 and H3PO4, the compounds in the questions are the conjugate bases and the other would be the acid
by AGulati_4A
Fri Nov 08, 2019 6:25 pm
Forum: Lewis Structures
Topic: Hybridization
Replies: 2
Views: 19

Re: Hybridization

Because the electron pair in the resonance structures are delocalized -- which means that they are not bound to any certain atom. And since they are no bound to any atom -- bond lengths keep changing which results in each bond -- at some point in time -- having an average bond length which is equal ...
by AGulati_4A
Fri Nov 08, 2019 6:23 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 17
Views: 53

Re: Resonance Structures

They are compounds that could have multiple variations for their structures, therefore -- these structures have delocalized electrons that make a changing structure
by AGulati_4A
Fri Nov 08, 2019 6:22 pm
Forum: Electronegativity
Topic: Ionic or covalent?
Replies: 17
Views: 99

Re: Ionic or covalent?

If the compounds are very far apart on the periodic table then they are ionic, if they are close to each other they are covalent
by AGulati_4A
Wed Nov 06, 2019 1:38 pm
Forum: Electronegativity
Topic: Determining Electronegativity
Replies: 4
Views: 39

Re: Determining Electronegativity

Br is a larger atom and has more electrons thus has a larger atomic radius -- because it has a lower effective nuclear charge. Therefore, the Br atom has lowerr electronegativity than the Cl atom
by AGulati_4A
Wed Nov 06, 2019 1:28 pm
Forum: Properties of Light
Topic: Frequency vs. Velocity
Replies: 4
Views: 23

Re: Frequency vs. Velocity

the velocity of light is c -- a constant -- while frequency is variable depending on the wavelength
by AGulati_4A
Wed Nov 06, 2019 1:27 pm
Forum: Bond Lengths & Energies
Topic: speed of electromagnetic radiation
Replies: 2
Views: 15

Re: speed of electromagnetic radiation

The speed of electromagnetic radiation is a constant -- c. This is not changed by wavelength or frequency. If you are referring to the multiple-choice from Lyndon's workshop, the answer choice was a trick.
by AGulati_4A
Wed Nov 06, 2019 1:02 pm
Forum: Einstein Equation
Topic: E=hv vs E=pc?
Replies: 3
Views: 37

Re: E=hv vs E=pc?

E= P*C is probably most likely not used in calculations. I think when it could be important is in the derivation of the De Broglie wave equation, which converts the P into mv and C into (lambda)(frequency) in order to find the De Broglie equation
by AGulati_4A
Wed Nov 06, 2019 12:57 pm
Forum: Einstein Equation
Topic: Unit Question
Replies: 2
Views: 16

Re: Unit Question

Keep in mind the prefixes that were highlighted in the lectures, M or mega refers to 10^6 so one MHz would just be 10^6 Hz
by AGulati_4A
Wed Nov 06, 2019 12:53 pm
Forum: Lewis Structures
Topic: Ionic Lewis structure
Replies: 2
Views: 24

Re: Ionic Lewis structure

If it is an anion and a cation then it is an ionic bond. KCl is ionic since K has a +1 charge while Cl- has a 1- charge. On the other hand, something like CH4 is a covalent bond since the C and the H both have a positive charge (4+ for the C and 1+ for the H)
by AGulati_4A
Wed Nov 06, 2019 12:47 pm
Forum: Lewis Structures
Topic: 2B.11 part c
Replies: 1
Views: 13

Re: 2B.11 part c

The N is the central atom. The two H from the NH2 are each attached to the N. Further, both the Carbons are single bonded to the central N atom. The COOH molecule -- which, if you know from organic chem -- is a carboxylic acid which has one O double bonded to the Carbon and the other Oxygen single b...
by AGulati_4A
Wed Nov 06, 2019 12:36 pm
Forum: Properties of Light
Topic: De Broglie for Photon?
Replies: 3
Views: 26

Re: De Broglie for Photon?

The De Broglie equation requires you to calculate the momentum of a particle. In that calculation, you need the mass of the particle, which for a photon is non-existant. Therefore there is no way of using the De Broglie equation for photons
by AGulati_4A
Wed Nov 06, 2019 12:34 pm
Forum: Trends in The Periodic Table
Topic: Effect of Charge on an Atom
Replies: 2
Views: 16

Re: Effect of Charge on an Atom

The charge of a cation, in particular, can affect how the strong its polarizing power is. For example, a K+ ion has less polarizing power than an Mg2+ ion. Further, a K+ ion will have more polarizing power than a Rb+ ion since the K+ ion has a positive charge than can have a large distance of influn...
by AGulati_4A
Tue Nov 05, 2019 9:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Dino Nuggets 13d
Replies: 2
Views: 16

Re: Dino Nuggets 13d

The e- config for K is [Ar]4s1 while for Sc^(2+) it is [Ar]3d1. This is because Sc normally is [Ar]3d1 4s2 but when you ionize this and take away 2 electrons you first have to ionize the 4s orbital and then, if necessary, the 3d orbital. This is because the 3d orbital becomes of less energy than the...
by AGulati_4A
Tue Nov 05, 2019 9:19 pm
Forum: Resonance Structures
Topic: Resonance Structure Midterm
Replies: 5
Views: 56

Re: Resonance Structure Midterm

Only do that if they ask you to, they will specifically ask you to draw the resonance structures
by AGulati_4A
Tue Nov 05, 2019 9:17 pm
Forum: Einstein Equation
Topic: e=hv used for particles?
Replies: 3
Views: 30

Re: e=hv used for particles?

It is only used for electromagnetic radiation, E= 1/2 (m)(v)^2 is used for particles
by AGulati_4A
Sun Nov 03, 2019 2:47 pm
Forum: *Shrodinger Equation
Topic: Concepts needed for midterm
Replies: 2
Views: 52

Re: Concepts needed for midterm

You just need to know that it is a waveform equation and the sign used to represent electron position is psi (the trident) and (psi)^2 is the electron density in a region. You would also need to know the idea that, barring the s orbital, all other orbitals have suborbital -- which intersect at the m...
by AGulati_4A
Sun Nov 03, 2019 2:44 pm
Forum: General Science Questions
Topic: Finding Formulas from Chemical Name
Replies: 4
Views: 36

Re: Finding Formulas from Chemical Name

It is highly possible; I think the best way for you to learn is to 1. Learn how to write out ionic compounds 2. How to write out covalent formulas and 3. learn the names and charges of common polyatomic ions. For the more complicated molecules, you probably will be given the formulas.
by AGulati_4A
Sun Nov 03, 2019 2:33 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: dino nugget midterm review 10d
Replies: 4
Views: 35

Re: dino nugget midterm review 10d

You have to draw the valence electron configuration diagrams for this. Since N has 3 electrons in its p shell, the electrons are each in different suborbitals -- and have a parallel spin (the px, py, and pz orbitals). And Oxygen actually has 4 electrons in its 2p shell, so one of the sub-orbitals ha...
by AGulati_4A
Sun Nov 03, 2019 1:44 pm
Forum: Bond Lengths & Energies
Topic: Resonance bond length
Replies: 4
Views: 14

Re: Resonance bond length

Yes
by AGulati_4A
Sun Nov 03, 2019 12:59 pm
Forum: Ionic & Covalent Bonds
Topic: Relationship with Polarity
Replies: 3
Views: 16

Re: Relationship with Polarity

the higher the polarity, the more unequal the sharing of electrons would be, and the higher the ability of the two atoms to ionize and therefore the higher the ionicity.
by AGulati_4A
Sun Nov 03, 2019 12:56 pm
Forum: Electronegativity
Topic: Measuring Electronegativity
Replies: 4
Views: 22

Re: Measuring Electronegativity

electronegativity is a derived value, therefore, it is not something that is experimentally measured -- so you would be right in saying it is a value compared to others.
by AGulati_4A
Sun Nov 03, 2019 12:55 pm
Forum: Electronegativity
Topic: Electron Affinity
Replies: 3
Views: 19

Re: Electron Affinity

Electronegativity is an experimental value while electron affinity is a naturally present value. Further, electronegativity is the measure of an element's ability to pull electrons towards itself when bonding while electronegativity refers to the ability of an element to gain electrons in its ionize...
by AGulati_4A
Sat Nov 02, 2019 11:42 pm
Forum: Dipole Moments
Topic: Dipole Moments on Lewis Structures
Replies: 2
Views: 18

Re: Dipole Moments on Lewis Structures

Just add the electronegativities to each atom on the compound, the vector lines point to those atoms that are relatively electronegative
by AGulati_4A
Sat Nov 02, 2019 11:37 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds question
Replies: 3
Views: 32

Re: sigma and pi bonds question

I don't think so if we don't learn about it in lecture we are most likely not going to see it
by AGulati_4A
Sat Nov 02, 2019 11:33 pm
Forum: Octet Exceptions
Topic: Boron
Replies: 2
Views: 23

Re: Boron

It isn't really explained why it is but you just have to know. I think in order to understand that you have to go further into chemistry. There are no clues about it either, with regards to the idea of orbitals.
by AGulati_4A
Fri Nov 01, 2019 5:36 pm
Forum: Dipole Moments
Topic: Solving for the Dipole Moment
Replies: 1
Views: 17

Re: Solving for the Dipole Moment

I don't think we have to calculate the dipole moment. This is a topic we learn in chem 14b
by AGulati_4A
Fri Nov 01, 2019 5:17 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Distorted Electrons
Replies: 4
Views: 26

Re: Distorted Electrons

An electron is not in itself distorted. If the effective nuclear charge of the atom that the electron is part of is relatively low and the ionization energy of the atom that pulls the electron towards is relatively high -- then the electron is highly polarizable and thus distorted
by AGulati_4A
Fri Nov 01, 2019 5:11 pm
Forum: Dipole Moments
Topic: identification
Replies: 3
Views: 15

Re: identification

When one or both of the atom is/ are part of a compound that contains a dipole. This means that they have a relatively positive or negative change and can result in a dipole
by AGulati_4A
Fri Nov 01, 2019 5:10 pm
Forum: Octet Exceptions
Topic: radical
Replies: 5
Views: 45

Re: radical

Radicals are just compounds or molecules that are not in their most stable form. This means that they do not have all of their valence electrons paired yet and thus are unstable. A good example of this is CH3, which is produced by incomplete combustion. This molecule of CH3, unlike methane (ch4), ha...
by AGulati_4A
Fri Nov 01, 2019 4:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d-orbital electrons and valence shell
Replies: 1
Views: 18

Re: d-orbital electrons and valence shell

The d orbital is not part of the valence shell for the most part because it is never the first one ionized -- when you ionize elements. This is because before you fill the d orbital in the electron configuration of an element, you have to fill the s orbital. This means that for example if you are wr...
by AGulati_4A
Fri Nov 01, 2019 4:15 pm
Forum: Ionic & Covalent Bonds
Topic: Distorted e- with Ionic Bonds
Replies: 5
Views: 27

Re: Distorted e- with Ionic Bonds

The anions electrons, when it intially reacts with a cation, are pulled towards the cation -- forming a temporary dipole in the anion. The ability of a cation to pull the anion's electronas towards it refers to the polarization power while the extent to which the electrons are pulled refer to the po...
by AGulati_4A
Fri Oct 25, 2019 12:00 pm
Forum: Sigma & Pi Bonds
Topic: Importance of Sigma/Pi Bonds
Replies: 5
Views: 170

Re: Importance of Sigma/Pi Bonds

This is extremely important as you want to classify the difference between the different orbitals between the bonds.
by AGulati_4A
Fri Oct 25, 2019 11:57 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron Configurations (p-orbital)
Replies: 5
Views: 25

Re: Electron Configurations (p-orbital)

Not necessarily, but Professor Lavell mentioned that he would prefer, for the sake of doing it in the future, you should start adopting it now.
by AGulati_4A
Fri Oct 25, 2019 11:56 am
Forum: Trends in The Periodic Table
Topic: Electron Affinty
Replies: 5
Views: 18

Re: Electron Affinty

"Electron affinity increases as the number of valence electrons in a compound decrease". If you can remember this, you do not need to memorize the periodic trend
by AGulati_4A
Fri Oct 25, 2019 11:54 am
Forum: Resonance Structures
Topic: Delocalization
Replies: 3
Views: 19

Re: Delocalization

Delocalization of electrons essentially means that the electrons can disperse throughout the internuclear structure of the compound or molecule. in order to understand this you first have to let go of the conception that bonds are actual "lines" or "physical strucutres." Bonds ar...
by AGulati_4A
Fri Oct 25, 2019 11:47 am
Forum: Einstein Equation
Topic: 1B. 5
Replies: 4
Views: 34

Re: 1B. 5

Convert the value to Joules and then you can plug it in as a unit for Energy is the equation E=HV, where E is the energy, H is Planck's constant 9which will beon the formula sheet), and V is the wavelength -- which you can then find easily
by AGulati_4A
Sat Oct 19, 2019 11:51 pm
Forum: Quantum Numbers and The H-Atom
Topic: Angular Wavefunctions
Replies: 2
Views: 17

Re: Angular Wavefunctions

No, i think professor Lavell said in class that this is omitted from the textbook. We don't need to know this its just there so that you can see it. I think he also said these are graduate level.
by AGulati_4A
Sat Oct 19, 2019 11:46 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron States
Replies: 3
Views: 24

Re: Electron States

Electrons, when energized, move up to certain energy levels in the atom. This means that they are in a certain distance away from the atom -- due to their specific energy. The position they are in, and where other electrons of the same energy are in, is classified as an orbital. This is all he means...
by AGulati_4A
Sat Oct 19, 2019 2:25 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Question about last lecture
Replies: 4
Views: 18

Re: Question about last lecture

Just be careful though. He said this specificity is fine for the p orbital but he didn't recommend doing this for the d orbital as it can get complicated and we become more prone to making mistakes
by AGulati_4A
Sat Oct 19, 2019 2:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Tips for the Midterm
Replies: 10
Views: 59

Re: Tips for the Midterm

Try to create a compilation of all the problem sets that have been discussed in class along with the ones in discussions. Try to complete that problem as though it were an exam, and learn all the concepts that you missed on that exam
by AGulati_4A
Sat Oct 19, 2019 2:22 pm
Forum: Photoelectric Effect
Topic: One photon one atom interaction
Replies: 14
Views: 69

Re: One photon one atom interaction

It would increase the kinetic energy of the electron -- with what remains of the initial energy after accounting for the work function
by AGulati_4A
Sat Oct 19, 2019 2:18 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Coulomb's Law
Replies: 3
Views: 16

Re: Coulomb's Law

So when one says that electrons at a higher energy level have more energy, this means that they have more Kinetic energy -- or the energy of movement. conversely, when electrons are at lower energy levels -- they don't lose their energy, at lower energy levels they have more potential energy -- whic...
by AGulati_4A
Fri Oct 11, 2019 11:04 am
Forum: Properties of Light
Topic: Amplitude
Replies: 12
Views: 85

Re: Amplitude

Amplitude is just how high and conversely how low the wave can go. Thinking about it in an analogical way, if you throw a ball, how high up you throw it doesn't really affect how far it goes in the sideways direction. in the same manner, how high up the amplitude of a wave goes doesn't really reflec...
by AGulati_4A
Fri Oct 11, 2019 11:01 am
Forum: Properties of Light
Topic: Waves/Particles
Replies: 14
Views: 103

Re: Waves/Particles

Photons are considered a subset of electromagnetic particles, hence all kinds of waves, including "visible light" are present of the Electromagnetic Spectrum.
by AGulati_4A
Fri Oct 11, 2019 10:58 am
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1058

Re: Week 2 Homework Problems [ENDORSED]

He said you can do the Quantum world problems or even the problems from the fundamentals for practice
by AGulati_4A
Mon Oct 07, 2019 4:55 pm
Forum: Limiting Reactant Calculations
Topic: Homework Problem L.1
Replies: 2
Views: 36

Re: Homework Problem L.1

To calculate the limiting reactant, you would also need to know how many moles of BrF3 we have in the reactants, along with .30 moles of ClO2. This, or least the mass of BrF3, would need to be given in order to find out what the limiting reactant is. But the general rule in order to find the limitin...
by AGulati_4A
Mon Oct 07, 2019 4:41 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula Help [ENDORSED]
Replies: 7
Views: 89

Re: Empirical Formula Help [ENDORSED]

After dividing each molar value by the lowest one in the group, you have to just multiply those values you get and make them hole numbers. these numbers would be the empirical subscripts for your answer
by AGulati_4A
Thu Oct 03, 2019 2:59 pm
Forum: Significant Figures
Topic: Question About Significant Figures and Rounding
Replies: 22
Views: 201

Re: Question About Significant Figures and Rounding

Watch this video, it is super helpful: https://www.khanacademy.org/math/arithmetic-home/arith-review-decimals/arithmetic-significant-figures-tutorial/v/addition-and-subtraction-with-significant-figures Also, you are simply taking the number with the least amount of sig figs, as you don't want your a...
by AGulati_4A
Thu Oct 03, 2019 2:55 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamentals E25
Replies: 5
Views: 38

Re: Fundamentals E25

Haley Chun 4H wrote: Avogadro's number. Sorry to be so technical, but this number would be considered Avogadro's constant as you are using (6.023 x 10^23 atoms/ mol) not just atoms).
by AGulati_4A
Thu Oct 03, 2019 2:53 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamentals E25
Replies: 5
Views: 38

Re: Fundamentals E25

Formula units is the number of atoms in in a certain quantity of a compound. In this case, you would simply need to cover .750 mol into number of atoms thus multiplying it by (6.023 x 10^23 atoms/mol) -- or Avogadro's constant
by AGulati_4A
Thu Oct 03, 2019 2:43 pm
Forum: Significant Figures
Topic: General sig figs question
Replies: 5
Views: 42

Re: General sig figs question

When adding or subtracting, you always take the number with the lowest # of sig figs; this is so that you are not making the answer more precise than any of its individual parts. Watch this Khan Academy video, it's so helpful: https://www.khanacademy.org/math/arithmetic-home/arith-review-decimals/ar...
by AGulati_4A
Thu Oct 03, 2019 2:39 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 61
Views: 53659

Re: Tutoring? [ENDORSED]

This really helps! Thank you
by AGulati_4A
Thu Oct 03, 2019 2:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 117
Views: 1695

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

That genuinely sounds awesome! I have always heard several stories of how much joy people derive from medicine but to hear it from a perspective of a Bruin really makes me happy and optimistic about the future.

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