Search found 51 matches

by Aman Sankineni 3E
Sun Dec 08, 2019 6:22 pm
Forum: Octet Exceptions
Topic: Octet exception
Replies: 13
Views: 45

Re: Octet exception

Any element beyond Na would have the exception.
by Aman Sankineni 3E
Sun Dec 08, 2019 6:21 pm
Forum: General Science Questions
Topic: 50 post grade
Replies: 15
Views: 110

Re: 50 post grade

I think it depends on your TA.
by Aman Sankineni 3E
Sun Dec 08, 2019 6:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR of S02
Replies: 4
Views: 11

Re: VSEPR of S02

Yup, bent and AX2E
by Aman Sankineni 3E
Sun Dec 08, 2019 6:19 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 35
Views: 326

Re: Class Grading

I hope he ends up curving the class.
by Aman Sankineni 3E
Sat Dec 07, 2019 9:15 pm
Forum: Lewis Structures
Topic: ClF4+ Lewis Structure
Replies: 2
Views: 13

ClF4+ Lewis Structure

Why does the lewis structure for ClF4+ place a formal charge of -1 on the central Cl atom when you could double bond one of the F atoms and move the formal charge of -1 to one of the non-central atoms?
by Aman Sankineni 3E
Wed Nov 27, 2019 4:36 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compounds other than Be, Al, Ga, Sn, Pb, and Sb
Replies: 3
Views: 17

Re: Amphoteric Compounds other than Be, Al, Ga, Sn, Pb, and Sb

The definition of amphoteric is a species that is able to act as both a base and acid, which means it should be able to accept and donate a proton when need be. The easiest way to remember is if the elements in question are part of the metalloid oxides section of the periodic table as opposed to the...
by Aman Sankineni 3E
Wed Nov 27, 2019 4:33 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids
Replies: 13
Views: 59

Re: Acids

He will probably ask questions about acid/base strength based on the list given. As long as you know how to find strength, you would be able to answer the questions based on those 7.
by Aman Sankineni 3E
Wed Nov 27, 2019 4:30 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Inorganic vs organic
Replies: 5
Views: 21

Re: Inorganic vs organic

Acids and bases containing carbon are known as organic. Acids and bases that DO NOT contain carbon are known as inorganic.
by Aman Sankineni 3E
Wed Nov 27, 2019 4:29 pm
Forum: Naming
Topic: Simple Definitions
Replies: 1
Views: 14

Re: Simple Definitions

A coordination complex is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds. Compounds that contain a coordination complex are called coordination compounds. Ligands are Lewis bases - the...
by Aman Sankineni 3E
Wed Nov 27, 2019 4:28 pm
Forum: Biological Examples
Topic: EDTA
Replies: 8
Views: 46

Re: EDTA

EDTA is used for chelation therapy. Chelation means "to grab" or "to bind." When EDTA is injected into the veins, it "grabs" heavy metals and minerals such as lead, mercury, copper, iron, arsenic, aluminum, and calcium and removes them from the body. It is used to treat...
by Aman Sankineni 3E
Tue Nov 19, 2019 4:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: SO3(2-)
Replies: 3
Views: 19

SO3(2-)

Is SO3(2-) polar or nonpolar?
by Aman Sankineni 3E
Tue Nov 19, 2019 3:55 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: 3F.1 C
Replies: 3
Views: 21

Re: 3F.1 C

Molecular size determines intermolecular interaction strength. Since Iodine is a larger atom than Fluorine, it has stronger intermolecular strength and therefore a higher melting point.
by Aman Sankineni 3E
Tue Nov 19, 2019 3:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2 related HW problems
Replies: 2
Views: 52

Re: Test 2 related HW problems

The questions on the syllabus from 3F, 2E, and anything that covers sigma and pi bonds, so 2F.1 will cover topics on the test.
by Aman Sankineni 3E
Tue Nov 19, 2019 3:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Thiosulfate Ion
Replies: 4
Views: 21

Re: Thiosulfate Ion

If the formal charges should be on the atom with the greatest electronegativity, then shouldn't the double bonds be to one oxygen and one sulfur? Then the other two oxygen would both have a formal charge of -1.
by Aman Sankineni 3E
Tue Nov 19, 2019 1:36 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Thiosulfate Ion
Replies: 4
Views: 21

Re: Thiosulfate Ion

That would create a formal charge of -1 on both the single-bonded oxygen and sulfur. If you put double bonds on all of them, it would create a formal charge of -2 on the central sulfur. Isn't that identical in terms of formal charge?
by Aman Sankineni 3E
Tue Nov 19, 2019 12:38 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Thiosulfate Ion
Replies: 4
Views: 21

Thiosulfate Ion

What is the lewis dot structure for a thiosulfate ion? I drew it with a Sulfur in the middle with double bonds to three oxygen and the other sulfur. This would give the central sulfur a -2 formal charge.
by Aman Sankineni 3E
Sat Nov 16, 2019 6:00 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 1
Views: 31

Re: Resonance Structures

CO has 10 valence electrons in total. A triple bond would be 6 electrons and a lone pair on both the C and the O would add another 4, making 10 total while also fulfilling the octet rule for both.
by Aman Sankineni 3E
Sat Nov 16, 2019 5:58 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 7
Views: 38

Re: Polarity

CCl4 has a tetrahedral shape that is symmetrical. Therefore, the bond polarity is canceled out.
by Aman Sankineni 3E
Thu Nov 14, 2019 1:17 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: Rotation of Polar Molecules in Dipole-Dipole Forces
Replies: 1
Views: 27

Rotation of Polar Molecules in Dipole-Dipole Forces

How does the rotation of various energy orientations work in dipole-dipole forces? Essentially, what does the explanation for figure 3F.5 mean?
by Aman Sankineni 3E
Thu Nov 14, 2019 1:16 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: Dipole-Dipole vs. Ion-Dipole
Replies: 2
Views: 32

Dipole-Dipole vs. Ion-Dipole

Why does the strength of the interaction in dipole-dipole forces depend more heavily on distance than the strength of interaction in ion-dipole forces?
by Aman Sankineni 3E
Thu Nov 14, 2019 1:12 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: Ion-Dipole
Replies: 2
Views: 33

Ion-Dipole

Does a larger extent of hydration mean a stronger intermolecular attraction?
by Aman Sankineni 3E
Sun Nov 10, 2019 10:47 pm
Forum: Formal Charge and Oxidation Numbers
Topic: central atom
Replies: 21
Views: 90

Re: central atom

What do you do for exceptions? Such as in an atom consisting of N and O, which would be the central atom? O technically has the lower ionization energy than N. Does the number of desired bonds matter when considering the central atom more than the electronegativity? I believe the atom with the lowe...
by Aman Sankineni 3E
Sun Nov 10, 2019 10:45 pm
Forum: Bond Lengths & Energies
Topic: test 2
Replies: 16
Views: 66

Re: test 2

Also, is test 2 worth the same amount as test 1?
by Aman Sankineni 3E
Sun Nov 10, 2019 10:44 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Viscosity
Replies: 15
Views: 67

Re: Viscosity

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. Liquids with high viscosity have more of a resistance to deformation.
by Aman Sankineni 3E
Sun Nov 10, 2019 10:43 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polarizability and polarizing power
Replies: 4
Views: 18

Re: polarizability and polarizing power

Polarizing power follows the same trend as electronegativity while polarizability follows the trend of atomic radius.
by Aman Sankineni 3E
Sun Nov 10, 2019 10:41 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 3
Views: 17

Re: Bond Strength

Giving electrons is a lot stronger than sharing electrons.
by Aman Sankineni 3E
Sun Nov 03, 2019 11:28 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: rydberg equation
Replies: 2
Views: 31

Re: rydberg equation

What's the way Lavelle taught us how to solve it?
by Aman Sankineni 3E
Sun Nov 03, 2019 11:25 pm
Forum: Trends in The Periodic Table
Topic: ionization energy vs electronegativity
Replies: 4
Views: 20

Re: ionization energy vs electronegativity

Ionization energy: the energy required to remove an electron from a neutral atom.
Electronegativity: the ability of an atom in a molecule to draw bonding electrons to itself.
by Aman Sankineni 3E
Sun Nov 03, 2019 9:39 pm
Forum: DeBroglie Equation
Topic: Ch.1 #41 [ENDORSED]
Replies: 6
Views: 482

Re: Ch.1 #41 [ENDORSED]

The answer is 3956 m/s.
by Aman Sankineni 3E
Sun Nov 03, 2019 5:58 pm
Forum: Properties of Electrons
Topic: Question 1.15 on homework
Replies: 11
Views: 3673

Re: Question 1.15 on homework

How can you tell that the transition is in the Lyman series from the fact that it is in the ultraviolet spectrum of atomic hydrogen? Lyman series are the only series found in the ultraviolet spectrum of atomic hydrogen. By knowing that the transition is in the ultraviolet spectrum allows us to know...
by Aman Sankineni 3E
Sun Nov 03, 2019 5:36 pm
Forum: Properties of Light
Topic: HW #1.7
Replies: 5
Views: 345

Re: HW #1.7

SammiOrsini_1B wrote:I think i am a little confused too. I thought there were 10^-9 meters in a nanometer and 10^-12 meters in picometer.


This should be right. Use dimensional analysis with these numbers in order to convert from meters to nanometers/picometers.
by Aman Sankineni 3E
Sun Oct 27, 2019 7:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: p-orbitals
Replies: 11
Views: 31

Re: p-orbitals

If we're writing a larger p-orbital values, can we use a noble gas to substitute? Ex. [Ne]3s^1
by Aman Sankineni 3E
Sun Oct 27, 2019 7:54 pm
Forum: Ionic & Covalent Bonds
Topic: Double and single bond lengths
Replies: 6
Views: 31

Re: Double and single bond lengths

The double bond consists of two types of bonds, the pi bond and the sigma bond. The sigma bond is stronger than the pi bond which results in a shorter bond length. As for a triple bond, there are two pi bonds and one sigma bond, which results in an even shorter bond length. What is the difference b...
by Aman Sankineni 3E
Sun Oct 27, 2019 7:52 pm
Forum: Trends in The Periodic Table
Topic: Ionization energy vs. electron affinity
Replies: 1
Views: 16

Re: Ionization energy vs. electron affinity

I don't exactly know what questions will be asked about the two but they are different. Ionization energy refers to the amount of energy necessary to remove the outermost electron of an atom or molecule. Electron affinity refers to the amount of energy necessary for a neutral ion to gain an electron...
by Aman Sankineni 3E
Sun Oct 27, 2019 7:49 pm
Forum: Ionic & Covalent Bonds
Topic: Homework
Replies: 13
Views: 100

Re: Homework

Nathan Rothschild_3D wrote:I would recommend doing it on the chemical bonds section but since part of this last week included the quantum realm, it should still be okay to do some problems from that section.

From what I've seen, this is right. It should be okay to do problems from either section.
by Aman Sankineni 3E
Sun Oct 27, 2019 7:43 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 11
Views: 70

Re: Covalent Bonds

504939134 wrote:Covalent bonds can only be formed by nonmetals, and metals are more likely to form ionic bonds. Remember that metals often times become cations because it is easier for them to give up electrons. Non metals have high ionization energy.

Nonmetals can also form ionic bonds, right?
by Aman Sankineni 3E
Sun Oct 20, 2019 4:19 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 9
Views: 46

Re: Quantum Numbers

I believe they are used in more complicated experiments and more detailed chemistry, but in terms of this class, we probably won't be going over them since those elements don't come up.
by Aman Sankineni 3E
Sun Oct 20, 2019 4:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: paired and parallel electrons
Replies: 3
Views: 20

Re: paired and parallel electrons

When two electrons are parallel, both will be having the same spin or both going up/going down. When two electrons are paired, they will have opposite spins, one going up and one going down. If two electrons are in the same orbital they will always have opposite spins (paired). If they are in two di...
by Aman Sankineni 3E
Sun Oct 20, 2019 4:16 pm
Forum: Properties of Electrons
Topic: Subshell Exceptions
Replies: 6
Views: 42

Re: Subshell Exceptions

"Exceptions are based on the fact that half-full or full shells or subshells are more stable than partially filled ones. When the difference in energy levels between two subshells is small, an electron may transfer to the higher level shell to fill or half-fill it. The electron occupies the hig...
by Aman Sankineni 3E
Sun Oct 20, 2019 2:56 pm
Forum: Photoelectric Effect
Topic: Sodium Vapor Lamps (1.19 hw) [ENDORSED]
Replies: 6
Views: 7988

Re: Sodium Vapor Lamps (1.19 hw) [ENDORSED]

Ohhhh, just got it. Thank you!
by Aman Sankineni 3E
Tue Oct 15, 2019 11:56 pm
Forum: Photoelectric Effect
Topic: Sodium Vapor Lamps (1.19 hw) [ENDORSED]
Replies: 6
Views: 7988

Re: Sodium Vapor Lamps (1.19 hw) [ENDORSED]

b) First, you convert mg to g 5.00 mg * (1g/1000mg) = 5.00 x 10^-3 g of Na Since, it's asking for the how much energy is emitted by an excited SODIUM, you use the molar mass of Na 5.00x10^-3 g Na * (1 mol Na/ 23g Na) * (6.022 x10^23 atoms Na/ 1 g Na) = 1.31 x10^20 atoms of Na (1.31 x10^20 atoms Na)...
by Aman Sankineni 3E
Sun Oct 13, 2019 9:35 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 48
Views: 37214

Re: How to find my posts

You can find your grades on the study list on myUCLA. Next to each class is a link to your grades for that class.
by Aman Sankineni 3E
Sun Oct 13, 2019 9:33 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 90
Views: 19153

Re: Final Jitters

Getting a good night's sleep is important and helps me with anxiety before tests.
by Aman Sankineni 3E
Sun Oct 13, 2019 9:30 pm
Forum: Properties of Light
Topic: Frequency, Wavelength, Amplitude, and Velocity
Replies: 4
Views: 33

Re: Frequency, Wavelength, Amplitude, and Velocity

Velocity is a product of wavelength and frequency in terms of wavelength.
by Aman Sankineni 3E
Sun Oct 13, 2019 8:30 pm
Forum: SI Units, Unit Conversions
Topic: knowing how many sig figs to use
Replies: 17
Views: 104

Re: knowing how many sig figs to use

Is it usually safe to have four decimal places for calculations and answers?
by Aman Sankineni 3E
Sun Oct 13, 2019 8:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7726
Views: 1043372

Re: Post All Chemistry Jokes Here

How often do I tell chemistry jokes? Periodically!
by Aman Sankineni 3E
Fri Oct 04, 2019 1:16 am
Forum: Molarity, Solutions, Dilutions
Topic: E 27
Replies: 6
Views: 53

Re: E 27

Yup, that's what I got too.
by Aman Sankineni 3E
Thu Oct 03, 2019 11:06 pm
Forum: Molarity, Solutions, Dilutions
Topic: E 29 part c
Replies: 8
Views: 952

Re: E 29 part c

Because it is just the percentage of mass of oxygen, then the original mass of 8.61g copper(II) chloride tetrahydrate doesn't matter. No matter how many grams of the sample you have the percentage mass of oxygen should always be the same because of the molar ratios. Correct me if I'm wrong! Yup, th...
by Aman Sankineni 3E
Thu Oct 03, 2019 11:03 pm
Forum: Limiting Reactant Calculations
Topic: Reaction Stochiometry L.3 [ENDORSED]
Replies: 3
Views: 823

Re: Reaction Stochiometry L.3 [ENDORSED]

a. 8.6 x 10^-5 mol
b. 11.3198 grams
by Aman Sankineni 3E
Wed Oct 02, 2019 3:49 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals of chem: Dilution G9
Replies: 4
Views: 1365

Re: Fundamentals of chem: Dilution G9

.179 M x .5 L = 0.0895 mol
AgN03 molar mass = (107.87 + 14 + 16*3) = 169.87 g mol^-1
.0895 mol x 169.87 g mol^-1 = 15.034 grams
by Aman Sankineni 3E
Tue Oct 01, 2019 11:32 pm
Forum: Molarity, Solutions, Dilutions
Topic: E 29 part c
Replies: 8
Views: 952

Re: E 29 part c

For part d, you must figure out the mass of oxygen as part of the formula. Since there is 4 oxygen atoms, the mass of oxygen is 16x4=64. By dividing that by the total mass of the formula, 206.446, you can figure out what fraction of the total mass was due to oxygen. 64/206.446=.310008 or 31%.

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