## Search found 66 matches

Wed Dec 04, 2019 10:28 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: isomers
Replies: 1
Views: 35

### isomers

would we need to know isomers? Such as geometrical and optical? I know we never discussed it in lecture but it's in the book so I want to make sure
Wed Dec 04, 2019 10:19 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 5
Views: 100

### Re: Chelate

405310750 wrote:I thought we use bis tris etc when naming multiple of the same polydentate? or is this the same thing?

yes, since all chelates are polydentate
Wed Dec 04, 2019 8:33 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 5
Views: 100

### Re: Chelate

you should know that their naming convention would be different. Instead of using di, tri, etc, you would use bis, tris, tetrakis, etc. Should also know that they form rings when bonded to the central atom, and that they are polydentate
Tue Dec 03, 2019 11:38 am
Forum: Industrial Examples
Topic: Bond rotations
Replies: 4
Views: 105

### Bond rotations

If single bonds can rotate, and double bonds can’t rotate, do resonance rotate?
Mon Dec 02, 2019 3:41 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: how to find pH
Replies: 4
Views: 80

### how to find pH

other than when the question gives you the mole, how do you find pH? For example, how would you get pH from pKa? What are other question formats that leads to pH?
Mon Dec 02, 2019 3:37 pm
Forum: Properties of Light
Topic: Determining which equation to use
Replies: 3
Views: 139

### Re: Determining which equation to use

if the question gives you the wavelength for an object, that would clue you to de Broglie, and if it gives you wavelength of a light or radiation, it would be the speed of light equation.
Mon Dec 02, 2019 3:35 pm
Forum: Lewis Acids & Bases
Topic: charged acid
Replies: 1
Views: 40

### charged acid

What does it mean when the acid is neutral or negatively charged? Where does this charge come from? How can I tell whether it's charged or not? Do bases get charged as well?
Mon Dec 02, 2019 3:33 pm
Forum: Bronsted Acids & Bases
Topic: pH and pka
Replies: 1
Views: 38

### pH and pka

how do you get pH from pKa and vice versa? Also, what is their relationship and why is it possible to get pH from pKa
Mon Dec 02, 2019 3:32 pm
Forum: Conjugate Acids & Bases
Topic: How many gets transferred?
Replies: 1
Views: 41

### How many gets transferred?

For Acid and Base reactions, how many protons and oh- gets transferred?
Wed Nov 27, 2019 3:50 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: polydente
Replies: 2
Views: 48

### polydente

Are we supposed to be able to identify polydente compounds by the formula? Or do we have to draw it out.
Wed Nov 27, 2019 3:49 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Inorganic vs organic
Replies: 5
Views: 84

### Inorganic vs organic

What are the differences between inorganic vs organic acids and bases?
Wed Nov 27, 2019 3:48 pm
Forum: Conjugate Acids & Bases
Topic: What are conjugates?
Replies: 3
Views: 75

### What are conjugates?

What are conjugates exactly and how do I identify them? I have never heard of this except when Dr. Lavelle briefly touched on it in class
Wed Nov 27, 2019 3:46 pm
Forum: Bronsted Acids & Bases
Topic: Relative Acidity
Replies: 3
Views: 44

### Re: Relative Acidity

First, we can look at when it is just a hydrogen with the halogen elements, which are F, Cl, Br, and I. When it is just a hydrogen atom with one of the halogens, you can look at the distance between the bonds. Since fluorine has a smaller atomic radius, the hydrogen is bonded closer, since it is clo...
Wed Nov 27, 2019 3:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordinate covalent bonds
Replies: 3
Views: 75

### Re: Coordinate covalent bonds

It is covalent because the electrons are still shared between the two atoms, one atom is not giving away both their atoms. For example, a kid with two snacks do not give away both their snacks, they share their snack with the kid with no snacks.
Tue Nov 19, 2019 6:21 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: induced dipole-induced dipole
Replies: 4
Views: 55

### Re: induced dipole-induced dipole

They can happen in all molecules. Basically, electrons move around all the time so at a certain time, there can be a lot of electrons towards one side, so it would be partially negative there at that moment, temporarily.
Mon Nov 18, 2019 12:39 am
Forum: Determining Molecular Shape (VSEPR)
Topic: pentagonal bipyramidal 3 lone pairs?
Replies: 2
Views: 45

### Re: pentagonal bipyramidal 3 lone pairs?

I learned in a step up that you continue to put it on the equatorial plane so that the trigonal part of the structure is now gone. The shape becomes linear, with the two bonded pairs as far as possible, which is 180 degrees.
Mon Nov 18, 2019 12:36 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: 3F.19
Replies: 2
Views: 35

### Re: 3F.19

I believe it is because in both, they are bigger, therefore, more polarizable and the interactions are stronger
Mon Nov 18, 2019 12:33 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 moments
Replies: 2
Views: 37

### Dipole moments

Are there always dipole moments in a molecule? How do we know when they cancel out and become nonpolar, esp if the shape also affects whether it’s nonpolar or not?
Mon Nov 18, 2019 12:32 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: Polarizability
Replies: 2
Views: 33

### Polarizability

How exactly does polarizability and the size of the atom make the interactions stronger?
Mon Nov 18, 2019 12:31 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: 1/r^6
Replies: 3
Views: 76

### 1/r^6

What is this equation exactly and do we need it for the test this week?
Wed Nov 13, 2019 6:42 pm
Forum: Bond Lengths & Energies
Topic: Interaction Potential Energy equation
Replies: 7
Views: 117

### Re: Interaction Potential Energy equation

What is this equation? Was it in lecture or the textbook? Any help would be great please.
Wed Nov 13, 2019 6:40 pm
Forum: Dipole Moments
Topic: Temporary Dipoles
Replies: 5
Views: 79

### Re: Temporary Dipoles

electrons are always moving around, therefore, it also moves the charges around. For example, there may be more electrons on the left at one instance and there is temporarily a partial negative charge on the left, at another instance there can be a bunch of electrons on the bottom, so there will be ...
Wed Nov 13, 2019 6:38 pm
Forum: Ionic & Covalent Bonds
Topic: Solid v. Liquid v. Gas
Replies: 8
Views: 110

### Re: Solid v. Liquid v. Gas

It is not something we will solve but will be given to us. In relation to bonding, the states have to do with polarizability and bond strength. As we go down a row, the polarizability increases because the size increase, and there's more electrons that is farther from the nucleus, which makes an ato...
Wed Nov 13, 2019 6:31 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: Similar terms
Replies: 3
Views: 66

### Re: Similar terms

induced dipole is basically London and dispersion. According to my ta, it is basically caused by the constant movement of electrons, so the partial charges will be at different places as well.
Wed Nov 13, 2019 6:28 pm
Forum: Dipole Moments
Topic: Do lone pairs repel more?
Replies: 5
Views: 62

### Do lone pairs repel more?

I'm not sure if I heard correctly during lecture that lone pairs repel more in VSEPR. If that is true, why is that so?
Wed Nov 13, 2019 6:22 pm
Forum: Administrative Questions and Class Announcements
Replies: 12
Views: 298

KBELTRAMI_4I wrote:it says on the syllabus that 50% in the class is a C-, is this true?

I went to his office hours awhile back and that is what he said, however, that is only the bare minimum to pass. I believe you still have to get 450/500 points to get an A in the class.
Wed Nov 06, 2019 2:46 pm
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 3
Views: 71

### Re: Dipole Moment

There is dipole moment when the electronegativity difference is big enough, and when the structure is not symmetrical
Mon Nov 04, 2019 10:45 am
Forum: Lewis Structures
Topic: Tips and Tricks for Lewis structures
Replies: 2
Views: 32

### Tips and Tricks for Lewis structures

Hi guys, what are some tips and tricks for making Lewis Structure bonds? I still get confused on when it is better to respect octet rule vs formal charge, or where the charges should be, etc. Any tips or tricks will help, thank you so much!
Mon Nov 04, 2019 10:40 am
Forum: Properties of Light
Topic: Finding Frequency
Replies: 3
Views: 102

### Re: Finding Frequency

Yes, as stated above, use de Broglie's

frequency=planks constant/weight of ONE particle in kg*speed/velocity in m.s
Mon Nov 04, 2019 10:38 am
Forum: Ionic & Covalent Bonds
Topic: Electron Configuration
Replies: 2
Views: 37

### Re: Electron Configuration

so this is a diagram on the order to fill in the orbitals
1s
2s 2p
3s 3p 3d
4s 4p 4d 4f

then you would cross it out, downwards, diagonally, from right to left, for example, it is
2p, 3s, and another example on the order is 3d, then 3d
Mon Nov 04, 2019 10:34 am
Forum: Lewis Structures
Topic: breaking octet rules with electronegativity
Replies: 2
Views: 46

### breaking octet rules with electronegativity

How come in some bondings, such as CN minus, you put the extra electron with the C, even though the N is more electronegative, just because the N fulfilled the octet rule already, but in N2O, it is better to make O the negative charge, rather than the N? How do I know? And don't Oxygen prefer double...
Mon Nov 04, 2019 10:31 am
Forum: Lewis Structures
Topic: Steps of drawing lewis structures
Replies: 1
Views: 30

### Steps of drawing lewis structures

What are the least to most important steps for drawing Lewis structures? For example, is it more important to do formal charges first, or moving electrons first, etc.
Sat Nov 02, 2019 1:01 am
Forum: Lewis Structures
Topic: Electrons Moving Around
Replies: 3
Views: 63

### Electrons Moving Around

When doing Lewis structures, are electrons able to just "leave" their "home" atoms? Like, they are able to just go to another atom just to fulfill the octet rule?
Wed Oct 30, 2019 1:16 pm
Forum: Ionic & Covalent Bonds
Replies: 3
Views: 62

### Re: Atomic and ionic radii

Furthermore, the atomic radii between the two atoms are generally the same, while in ionic, the two radii are different because they are different elements
Wed Oct 30, 2019 1:13 pm
Forum: Octet Exceptions
Topic: List of Octet exceptions
Replies: 6
Views: 134

### Re: List of Octet exceptions

Here are some that I got from my plf session

sulfur can have 12 valence e
Nitrogen actually prefers 5
Boron can have 6 valence e

and the ones included by our peers
hopes this helps!
Wed Oct 30, 2019 1:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 4
Views: 52

### Re: Midterm

The midterm is covering material from fundamentals, to the end of chemical bonds, as my TA told us
Wed Oct 30, 2019 1:05 pm
Forum: Lewis Structures
Topic: Charges on Lewis Structures
Replies: 7
Views: 108

### Charges on Lewis Structures

if a compound is negatively charged, where do we put this extra electron?
Wed Oct 30, 2019 1:02 pm
Forum: Resonance Structures
Topic: dislocation
Replies: 1
Views: 58

### dislocation

can someone elaborate more on what dislocation is please?
Wed Oct 23, 2019 11:02 pm
Forum: Properties of Light
Topic: Homework 1.3
Replies: 2
Views: 56

### Re: Homework 1.3

What did you plug in for Plank's, and c?
Recheck calculations maybe?
Wed Oct 23, 2019 10:07 pm
Forum: SI Units, Unit Conversions
Topic: Sharing of electrons
Replies: 3
Views: 181

### Re: Sharing of electrons

Shivam Rana 1L wrote:Are you referring to nodes? Electrons exist in hybridized orbitals when molecules form.

the sharing of electrons during covalent bonds
Wed Oct 23, 2019 10:06 pm
Forum: Ionic & Covalent Bonds
Topic: electron configuration for ions
Replies: 3
Views: 115

### Re: electron configuration for ions

I believe it's because you have to remove electrons from the highest energy first, even though it is not like that in this case when electrons are being added.
Wed Oct 23, 2019 4:29 pm
Forum: Octet Exceptions
Topic: Max number of valence e
Replies: 6
Views: 75

### Re: Max number of valence e

That would depend on the principal quantum number, n, because each shell have a different number of subshells. For example, in n=1 where s is the only orbital, the max electrons would be 2. However, in n=3, where it has s, p, and d, then the max would be 18. s=2 p=6 d=10 add them up and you get 18 v...
Wed Oct 23, 2019 4:24 pm
Forum: Ionic & Covalent Bonds
Topic: What topic are we on?
Replies: 11
Views: 191

### What topic are we on?

For week 4's homework, do we still do Quantum questions, or did we move onto questions from the new unit, since we just started on it.
Wed Oct 23, 2019 4:23 pm
Forum: SI Units, Unit Conversions
Topic: Sharing of electrons
Replies: 3
Views: 181

### Sharing of electrons

Can someone elaborate more on how the electrons are shared on the internuclear axis, I'm having trouble visualizing it.
Wed Oct 23, 2019 4:07 pm
Forum: Trends in The Periodic Table
Topic: blocks
Replies: 13
Views: 159

### Re: blocks

That would be extremely helpful, but they are pretty clear on the periodic table, which will be given to us on every test. Just remember that s is on the left, p is on the right, and d is in the middle
Wed Oct 23, 2019 4:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Ion
Replies: 3
Views: 29

### Re: Ion

The ground state is when all the electrons are in the lowest energy level possible.
Tue Oct 15, 2019 3:46 pm
Forum: DeBroglie Equation
Topic: symbol
Replies: 4
Views: 77

### symbol

Hi, this may seem like a silly question by what does the symbol that looks like a fish mean? To be clearer, it is like an infinity sign but one side of it is unfinished. Thank you!
Tue Oct 15, 2019 3:37 pm
Forum: *Shrodinger Equation
Topic: What is Shrodinger's for?
Replies: 6
Views: 91

### What is Shrodinger's for?

In what context will we be using shrodinger's equation and what is it for? What does it tell us and what does it solve?
Tue Oct 15, 2019 3:35 pm
Topic: What is Black Body?
Replies: 35
Views: 482

### What is Black Body?

Can someone explain exactly what Black Body Radiation is and what is it for?
Tue Oct 15, 2019 3:31 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum
Replies: 1
Views: 18

### Re: Electromagnetic Spectrum

I talked to him during his office hours and he said we should know the two most common ones, which is
visible light 700nm-400nm
UV 400nm-100nm

I would learn xray also just in case
Tue Oct 15, 2019 3:26 pm
Forum: DeBroglie Equation
Topic: 1B.9 HW Question
Replies: 8
Views: 125

### Re: 1B.9 HW Question

First, convert wavelengths to photons. Since in one second, 32W is emitted, how many W is emitted in 2 seconds? Also, one photon is like one atom, or one molecule, or one electron, you can use Avogadro's number to convert number of photons to moles. Hope that helps!
Thu Oct 10, 2019 4:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Post Module: conversion
Replies: 3
Views: 59

### Re: Post Module: conversion

Perhaps I'm misinterpreting your question, but didn't you say that the wavelengths were already given? If not, what was given to be converted into wavelengths? That's what I assumed, but apparently, that was not the correct answer. The number that was given was 1,614,098 (not exact number) waveleng...
Wed Oct 09, 2019 10:20 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Post Module: conversion
Replies: 3
Views: 59

### Post Module: conversion

So I was doing the post-module assessment and there was a question about wavelengths of radiation emitted. How do I convert this to wavelengths?
Tue Oct 08, 2019 9:54 pm
Forum: SI Units, Unit Conversions
Topic: Will we have to know how to convert from Fahrenheit, Celsius, and Kelvin?
Replies: 4
Views: 119

### Re: Will we have to know how to convert from Fahrenheit, Celsius, and Kelvin?

I believe no because Lavelle has been recommending us to do the practice textbook questions but there hasn't been any temperature problems like that.
Tue Oct 08, 2019 9:53 pm
Forum: Photoelectric Effect
Topic: Post Assessment Problem 16
Replies: 3
Views: 79

### Re: Post Assessment Problem 16

How I understand it is that the threshold energy is the minimum energy for one photon to remove one electron, that's why there would be no energy left
Tue Oct 08, 2019 9:40 pm
Forum: Properties of Light
Topic: Work Function
Replies: 2
Views: 75

### Re: Work Function

The work function is the amount of energy needed to remove an electron from a metal. Different metals have different work functions. It can also be denoted as threshold energy, or "energy removed e-." It is in the function, E(photon)-work function=Ek(e-)
Tue Oct 08, 2019 9:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: G. 23
Replies: 3
Views: 120

### Re: G. 23

They are not multiplied together, but added because they are in separate compounds. When changing gram to moles, the one Cl from each compound is accounted for, then added, so technically, there is two.

Sorry I'm not very good at explanations but hope that made sense!
Tue Oct 08, 2019 9:27 pm
Forum: Properties of Light
Topic: Intensity and the number of photons
Replies: 3
Views: 1090

### Re: Intensity and the number of photons

Also, lights with shorter wavelengths, such as uv, has photons with more energy, therefore, just one of their photons can move one electron. The more intense the light is, the more photons there are. However, in light with shorter wavelength, their photons do not have enough energy to move an electr...
Thu Oct 03, 2019 1:21 pm
Forum: Properties of Light
Topic: Quantum homework
Replies: 4
Views: 86

### Quantum homework

Since we're starting on the Quantum World, when is the homework for this unit due?
Thu Oct 03, 2019 1:19 pm
Forum: Limiting Reactant Calculations
Topic: Basic Question
Replies: 11
Views: 174

### Re: Basic Question

There is usually only 1 limiting reactant because you only need one thing to run out for the whole chemical reaction to stop. I'm not sure what it is called when the proportions are perfect and there's no limiting reactant though.
Sat Sep 28, 2019 7:26 pm
Forum: Limiting Reactant Calculations
Topic: Mass Yield of Product
Replies: 4
Views: 112

### Re: Mass Yield of Product

Don't forget to balance the equation first. Hope this helps :)
Sat Sep 28, 2019 5:04 pm
Forum: SI Units, Unit Conversions
Topic: Question E1, visualization
Replies: 2
Views: 93

### Question E1, visualization

Hey guys, so I am just having trouble visualizing the stringing of atoms in E1. Since the atom has a radius of 144 pm, does that mean the diameter is 288, and we're just laying the atoms side by side? Thanks for the help!
Sat Sep 28, 2019 3:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Formatting homework
Replies: 12
Views: 236

### Re: Formatting homework

I would say yes, even if it's just incase to make sure since there's so many students and you want to make sure your points are given to you.
Sat Sep 28, 2019 12:20 am
Forum: Significant Figures
Topic: How does Significant Figures work? [ENDORSED]
Replies: 12
Views: 249

### Re: How does Significant Figures work?[ENDORSED]

My high school chem teacher used to always stress the importance of significant digits so yes, do keep them in the homework
Sat Sep 28, 2019 12:17 am
Forum: Administrative Questions and Class Announcements
Topic: Formatting homework
Replies: 12
Views: 236

### Formatting homework

Hey guys! I was just wondering how everyone is formatting their homework. Are you guys copying down the questions on a binder paper then doing it there?
Fri Sep 27, 2019 11:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 191
Views: 14415

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

This is so inspiring and gives me hope. Can I ask what extracurriculars you took part in?