Search found 51 matches

by ATingin_3I
Sun Dec 08, 2019 2:23 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: chelating ligands [ENDORSED]
Replies: 21
Views: 2342

Re: chelating ligands [ENDORSED]

As discussed in class, a chelating ligand has more than one bond to the same transition metal cation. I also discussed in class that the best chelating binding structure/motif was: atom with lone pair --- spacer atom --- spacer atom --- atom with lone pair ***And the ligand must have sigma bonds to...
by ATingin_3I
Sun Dec 08, 2019 1:48 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength- Acetic vs Formic Acid
Replies: 4
Views: 87

Re: Acid Strength- Acetic vs Formic Acid

The acetic acid has a methyl group attached (CH3), which is an electron-donating compound. As such, the anionic form of the acetic acid is less stable since the CH3 does not delocalize the negative charge and instead adds to it. Meanwhile, the H atom attached to the formic acid is electron-withdraw...
by ATingin_3I
Sun Dec 08, 2019 1:31 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: homework 6C. 21b
Replies: 2
Views: 56

Re: homework 6C. 21b

what rule or reasoning does this fall under? did he cover electron-donating abilities in lecture?
by ATingin_3I
Sun Dec 08, 2019 1:19 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 6C21
Replies: 2
Views: 44

Re: 6C21

For 6C)21, are we supposed to memorize acetic acid and trichloroacetic acid? or would we be given formulas?
by ATingin_3I
Sun Dec 08, 2019 12:25 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 6c.17
Replies: 5
Views: 73

Re: 6c.17

one of the answers I saw online involved pKb. Could we use this or would we need other values?
by ATingin_3I
Sun Dec 08, 2019 12:23 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 6c.17
Replies: 5
Views: 73

Re: 6c.17

Chem_Mod wrote:Hypobromite ion is negatively charged while morphine is neutral. HBrO is neutral while morphine would become positively charged after accepting a proton, which is less favorable. Thus hypobromite is the the stronger base


if something is a negative ion is it always a stronger base?
by ATingin_3I
Sat Dec 07, 2019 11:57 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Pka and Ph
Replies: 2
Views: 36

Re: Pka and Ph

so what does pKa tell us? And what is its relation to pH?
by ATingin_3I
Sat Dec 07, 2019 11:36 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH sig figs
Replies: 11
Views: 88

Re: pH sig figs

I thought sig figs for pH were equal to the exponent?
by ATingin_3I
Sat Dec 07, 2019 10:41 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Kw
Replies: 3
Views: 64

Re: Kw

Chem_Mod wrote:Kw was not discussed in 14A so you do not need to know it. It is the equilibrium constant for the autoionization of water into [OH-] and [H3O+]


so we can ignore that section in the textbook?
by ATingin_3I
Sun Nov 24, 2019 8:47 pm
Forum: Biological Examples
Topic: What should we know for the final?
Replies: 9
Views: 441

Re: What should we know for the final?

Kelsey Li 3B wrote:I agree with knowing about cisplatin especially because it was an example on the churro practice exam.


what is the churro practice exam?
by ATingin_3I
Sun Nov 24, 2019 8:46 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 12
Views: 113

Re: Cisplatin

ashwathinair wrote:You should know cisplatin has a different structure than the trans version of the molecule because of sigma and pi bonds and the lewis structures of each.


so what would transplatin be used for?
by ATingin_3I
Sun Nov 24, 2019 8:45 pm
Forum: Naming
Topic: Oxidation Numbers
Replies: 4
Views: 45

Re: Oxidation Numbers

Oxidation numbers are rules that you need to memorize. The following link is from Khan Academy regarding identifying Oxidation numbers. It is pretty helpful. https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/types-of-chemical-reactions/a/oxidation-number I really do hope t...
by ATingin_3I
Sun Nov 24, 2019 8:43 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Fac and Mer isomers
Replies: 2
Views: 17

Re: Fac and Mer isomers

briannam_3k wrote:Are we going to need to know fac and mer isomers as well as cis and trans?

what are fac and mer ligands?
by ATingin_3I
Mon Nov 18, 2019 9:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 3F.13
Replies: 1
Views: 31

Question 3F.13

I have a question about question 3F.13. The question asks which arrangement of molecules would produce the strongest intermolecular attractions. Since dichloromethane has an overall dipole and contains hydrogens, it is capable of forming hydrogen bonds, which would be the predominant intermolecular ...
by ATingin_3I
Sat Nov 16, 2019 3:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 9
Views: 67

Re: Bond Angles

It's probably easiest to just memorize a chart with all the bond angles stated, but for the test he said we just have to be able to say that a trigonal pyramidal shape has a smaller bond angle than a tetrahedral because of the lone pair having more repulsion than the bonded pair. but for this we do...
by ATingin_3I
Sat Nov 16, 2019 3:23 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 Topics
Replies: 11
Views: 111

Re: Test Topics

Destiny_Ryales_3J wrote:Wait so from which week to which week is this material from?

I would just look at the outlines and go from there to study
by ATingin_3I
Sat Nov 16, 2019 3:21 pm
Forum: Hybridization
Topic: Pi and Sigma Bonds
Replies: 17
Views: 351

Re: Pi and Sigma Bonds

Valence bond theory goes as follows:
single bond = sigma bond
double bond= sigma and pi bond
triple bond = sigma and two pi bonds
by ATingin_3I
Sat Nov 16, 2019 3:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to treat Radicals
Replies: 5
Views: 62

How to treat Radicals

If a radical is treated as 1 region of electron density, similar to a lone pair, does it also take up a larger region and create greater electron repulsion than a bonding-bonding pair?
by ATingin_3I
Sun Nov 10, 2019 11:52 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Viscosity
Replies: 15
Views: 166

Re: Viscosity

KarineKim1L wrote:This means that the intermolecular bonds are stronger, and thus the liquid is "thicker". It will not flow as well.

what are the differences between intermolecular and intramolecular forces
by ATingin_3I
Sun Nov 10, 2019 11:51 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: Dipole-Dipole vs Dipole-Induced
Replies: 2
Views: 21

Re: Dipole-Dipole vs Dipole-Induced

JustinHorriat_3b wrote:Whats the difference between Dipole-Dipole forces and Dipole-Induced? Are there similarities also.


in dipole-induced the polarized side of a molecule creates an induced dipole with its partial charges
by ATingin_3I
Sun Nov 10, 2019 11:49 pm
Forum: Resonance Structures
Topic: how to draw
Replies: 6
Views: 47

how to draw

How do I draw resonance structures? I know that you can draw all the different structures and write arrows or draw them with dotted lines. Which one is better?
by ATingin_3I
Sun Nov 10, 2019 11:47 pm
Forum: Ionic & Covalent Bonds
Topic: covalent bonds
Replies: 7
Views: 67

covalent bonds

how many different types of covalent bonds are there?
by ATingin_3I
Sun Nov 10, 2019 11:46 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum numbers
Replies: 12
Views: 143

Re: Quantum numbers

Suraj Doshi 1L wrote:Angular momentum is denoted by l.

l=0 is the s-orbital
l=1 is the p-orbital
l=2 is the d-orbital
l=3 is the f-orbital

should we be familiar with anything past l=3?
by ATingin_3I
Sun Nov 03, 2019 11:45 pm
Forum: Bond Lengths & Energies
Topic: Does bond length have any effects?
Replies: 5
Views: 36

Re: Does bond length have any effects?

how do we determine bond lengths/will we be asked to represent them?
by ATingin_3I
Sun Nov 03, 2019 11:44 pm
Forum: Dipole Moments
Topic: Dipole, midterm?
Replies: 7
Views: 99

Re: Dipole, midterm?

what's the difference between dipoles and partial charges?
by ATingin_3I
Sun Nov 03, 2019 11:43 pm
Forum: Dipole Moments
Topic: Dipole moments on Lewis structures
Replies: 3
Views: 33

Re: Dipole moments on Lewis structures

should we always do this when drawing lewis structures, or will the problem specify if we need to draw dipole moments?
by ATingin_3I
Sun Nov 03, 2019 11:37 pm
Forum: Trends in The Periodic Table
Topic: Effective Nuclear Charge and Nuclear Charge
Replies: 6
Views: 59

Re: Effective Nuclear Charge and Nuclear Charge

What is the trend in effective nuclear charge across the periodic table?
by ATingin_3I
Sun Nov 03, 2019 11:23 pm
Forum: Lewis Structures
Topic: Radicals
Replies: 5
Views: 67

Re: Radicals

What purpose does the radical serve? And how do we know when there is a radical present?
by ATingin_3I
Sun Nov 03, 2019 11:19 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs Pi Bonds
Replies: 2
Views: 27

Re: Sigma vs Pi Bonds

Will we need to know how to apply sigma vs. pi bonds for the midterm?
by ATingin_3I
Mon Oct 28, 2019 3:40 pm
Forum: Trends in The Periodic Table
Topic: Effective nuclear charge
Replies: 3
Views: 46

Effective nuclear charge

Is it true that the effective nuclear charge felt by an electron in the outermost shell of an atom is equal to the group # found on the periodic table? If so, why is this? And is this a reliable "trick" we can use?
by ATingin_3I
Sat Oct 26, 2019 12:49 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Drawing Lewis Structures
Replies: 5
Views: 74

Re: Drawing Lewis Structures

ngarcia wrote:What are the exceptions in drawing Lewis structures?


i supposed the exceptions in lewis structures would be P, S, and Cl, or other elements where the octet rule isn't valid anymore
by ATingin_3I
Sat Oct 26, 2019 12:47 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Chart
Replies: 2
Views: 28

Re: Electron Configuration Chart

wait what part of the electron configuration chart is incorrect?
by ATingin_3I
Sat Oct 26, 2019 12:46 am
Forum: Formal Charge and Oxidation Numbers
Topic: FC in lecture
Replies: 4
Views: 59

Re: FC in lecture

WYacob_1F wrote:In lecture, Lavelle said "charged delocalization tends to be more stable." Could someone please explain this?


delocalization of electrons means that an electron is freely moving around multiple overlapping orbitals, so the bond is spread out over more atoms, which makes it more stable.
by ATingin_3I
Sat Oct 26, 2019 12:40 am
Forum: Lewis Structures
Topic: Expanded octets
Replies: 2
Views: 29

Expanded octets

Are P, S, and Cl the only elements that can accommodate more than 8 valence electrons, or are there more exceptions?
by ATingin_3I
Sat Oct 26, 2019 12:37 am
Forum: Lewis Structures
Topic: Xenon
Replies: 1
Views: 31

Xenon

How many maximum valence electrons can xenon have? I thought it followed the octet rule, but I'm not sure anymore.
by ATingin_3I
Sun Oct 20, 2019 6:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 8
Views: 82

Re: Orbitals

Why is it that each orbital can only hold 2 electrons max?
by ATingin_3I
Sun Oct 20, 2019 6:15 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: magnetic quantum #
Replies: 3
Views: 38

magnetic quantum #

How do you figure out the subscript for the different orbitals? For example, how do we find the difference between P sub x and p sub y?
by ATingin_3I
Sun Oct 20, 2019 6:02 pm
Forum: *Particle in a Box
Topic: Particle in A box
Replies: 8
Views: 150

Re: Particle in A box

Particle in a box is a concept that is a way of looking at the concept of the quantized energy levels of electrons. It can be used with any wave model, being related to that of an acoustic guitar string. However, Lavelle stated you didn't need to focus on this concept. Wait what exactly is particle...
by ATingin_3I
Sat Oct 19, 2019 11:41 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 2030

Re: Rydberg equation [ENDORSED]

Can someone clarify why the Rydberg equation is always negative? Because you're "losing" energy because it's being transferred somewhere else? The Rydberg equation is negative because it is comparing the energy difference between the two levels the electrons transitioned between. When an ...
by ATingin_3I
Sat Oct 19, 2019 4:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Outer electrons
Replies: 2
Views: 39

Outer electrons

During the lecture on Friday, Dr. Lavelle mentioned that puter electrons don't experience the full nuclear charge. Is this due to electron shielding?
by ATingin_3I
Sat Oct 12, 2019 3:31 pm
Forum: Properties of Light
Topic: Wavelength
Replies: 4
Views: 49

Wavelength

why is it that when we decrease the wavelength, the energy and frequency increases?
by ATingin_3I
Sat Oct 12, 2019 3:26 pm
Forum: Properties of Light
Topic: Intensity of Light
Replies: 4
Views: 56

Re: Intensity of Light

I think it's just that when we increase the intensity of light then we increase the number of photons and vice versa. However, to determine if an electron is ejected, then we look at frequency instead.
by ATingin_3I
Thu Oct 10, 2019 2:35 am
Forum: Limiting Reactant Calculations
Topic: L 35 Textbook Typo [ENDORSED]
Replies: 4
Views: 101

Re: L 35 Textbook Typo [ENDORSED]

For L 35, what does the unit t in 2.50 t of NaBr mean?
by ATingin_3I
Wed Oct 09, 2019 9:04 pm
Forum: Properties of Light
Topic: Constants in the Quantum World
Replies: 6
Views: 64

Re: Constants in the Quantum World

When we are doing problems like these, is the mass of an electron always in terms of kg? Or do we have to convert them to g?
by ATingin_3I
Wed Oct 09, 2019 9:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Frequency
Replies: 15
Views: 177

Re: Frequency

Also speaking of frequency, is frequency always measured in terms of Hz?
by ATingin_3I
Wed Oct 02, 2019 11:47 pm
Forum: Empirical & Molecular Formulas
Topic: Question about Theoretical Yield
Replies: 8
Views: 128

Re: Question about Theoretical Yield

Tanmay Singhal 3F wrote:Is there any difference between calculating theoretical yield with grams versus theoretical yield with moles?


no, they should be the same. if they aren't then you need to check the conversion factor you are using between grams and moles.
by ATingin_3I
Wed Oct 02, 2019 4:11 pm
Forum: Molarity, Solutions, Dilutions
Topic: G7)
Replies: 2
Views: 42

G7)

For questions like G7 can we also assume that after finding the grams of the given compound in the aqueous solution, the leftover is just water?
by ATingin_3I
Wed Oct 02, 2019 4:03 pm
Forum: Molarity, Solutions, Dilutions
Topic: G5 Solution?
Replies: 5
Views: 59

Re: G5 Solution?

For some reason in this problem I am always .01 off when I round. Is anybody else having this problem and if so have any advice? I am doing the same process as mentioned above (setting up ratios and solving for x)
by ATingin_3I
Mon Sep 30, 2019 1:38 pm
Forum: Molarity, Solutions, Dilutions
Topic: Homework Question G.5
Replies: 4
Views: 113

Re: Homework Question G.5

Also, what is the significance of mmol? Where does this unit affect our calculations?
by ATingin_3I
Mon Sep 30, 2019 1:33 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formulas Rounding and Multiplying
Replies: 11
Views: 189

Re: Empirical Formulas Rounding and Multiplying

I agree with the other user that the amounts should be leaning towards a value usch as 0.5 or 0.33. In addition, I would like to add that each step of the way to use the correct sig figs because this personally has helped me to find values that I can see where to round to more so. In many situation...

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