Search found 55 matches

by 505106414
Mon Dec 02, 2019 8:23 pm
Forum: Conjugate Acids & Bases
Topic: the conjugate seesaw
Replies: 5
Views: 63

Re: the conjugate seesaw

There is an inverse relationship between acid and conjugate base/ base and conjugate acid.
by 505106414
Mon Dec 02, 2019 8:20 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compound
Replies: 5
Views: 50

Re: Amphoteric Compound

Amphoteric compounds are compounds that can act as both an acid and a base. In class he showed examples of acid and base reactions that involved water. Water can act as both an acid and a base as it can accept H+ to become H3O+ and donate H+ to become OH-. There are also a couple of nonmetal and me...
by 505106414
Mon Dec 02, 2019 8:20 pm
Forum: Identifying Acidic & Basic Salts
Topic: Acid protonation
Replies: 4
Views: 44

Re: Acid protonation

What exactly is protonation? What is happening to an acid undergoing protonation?
by 505106414
Mon Dec 02, 2019 8:17 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH vs. pOH
Replies: 17
Views: 247

Re: pH vs. pOH

Emma Popescu 3D wrote:If you have the pH of a solution, you can calculate its pOH or vice versa. For example, if the pH is 2 then the pOH will be 14-2=12

Just to clarify, they always add to 14?
by 505106414
Mon Dec 02, 2019 8:15 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Class wed 11/27
Replies: 7
Views: 80

Re: Class wed 11/27

Can someone explain what pOH is in a little bit more detail?
by 505106414
Tue Nov 26, 2019 4:09 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 169
Views: 133601

Re: Rusty on High School Chem [ENDORSED]

Does a lot of the material from 14a come up again in 14b or is it mainly new concepts?
by 505106414
Tue Nov 26, 2019 4:06 pm
Forum: Sigma & Pi Bonds
Topic: Question on Test 2
Replies: 11
Views: 257

Question on Test 2

Can someone explain the sigma and pi bond question from Test 2? I believe there was also a hydrogen bonding component to the question as well.
by 505106414
Tue Nov 26, 2019 4:05 pm
Forum: Amphoteric Compounds
Topic: Oxides
Replies: 4
Views: 58

Re: Oxides

rohun3H wrote:It is most useful to know the patterns of the periodic table.


Are there any exceptions?
by 505106414
Tue Nov 26, 2019 4:04 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: difficulties recognizing weak acids and bases
Replies: 9
Views: 798

Re: difficulties recognizing weak acids and bases

daniella_knight1I wrote:If you see a Ka or Kb constant that's a giveaway. If not you'll have to draw out the lewis structure and look at the lone pairs to determine if it's a weak acid or base.


Just clarifying that if you see a constant it is most likely a weak acid, not a strong one.
by 505106414
Tue Nov 26, 2019 4:03 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted Acids and Bases
Replies: 3
Views: 28

Re: Lewis vs Bronsted Acids and Bases

Will we use both in this class? Or will we use one more so than the other?
by 505106414
Tue Nov 19, 2019 8:37 pm
Forum: Ionic & Covalent Bonds
Topic: strength of bonds
Replies: 11
Views: 265

Re: strength of bonds

Does strength of bonds relate to its melting point?
by 505106414
Tue Nov 19, 2019 8:35 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 118
Views: 31181

Re: Final Jitters

I always get really bad anxiety during test week to the point where I get sick and throw up or am constantly nauseous. Anyone have ideas for how to help while also being able to study? You could try meditating and planning little study breaks to look forward to. Also, try to think about tests in th...
by 505106414
Tue Nov 19, 2019 8:32 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 134
Views: 101321

Re: Reading the textbook [ENDORSED]

I have had a problem on a test that had an answer that was only covered in the textbook, not in lecture at all. So, I would say definitely at least skim the textbook chapters.
by 505106414
Tue Nov 19, 2019 8:31 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge
Replies: 6
Views: 160

Re: formal charge

A very simplified/juvenile way to think of formal charge is FC = Valence E - (# sticks + # dots). Sticks being bonds and dots being single electrons in lone pairs.
by 505106414
Tue Nov 19, 2019 8:29 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Hydrogen Bonding/Pi bonds
Replies: 11
Views: 214

Re: Hydrogen Bonding/Pi bonds

What are all of the kinds of intermolecular forces?
by 505106414
Fri Nov 15, 2019 11:59 pm
Forum: Trends in The Periodic Table
Topic: Question
Replies: 17
Views: 364

Re: Question

Can someone explain the exception for oxygen and nitrogen? It was on the midterm and I got it wrong.
by 505106414
Fri Nov 15, 2019 11:58 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 12
Views: 117

Re: Polarity

What is dipole-dipole? I know we talked about it a lot in class but I am still confused.
by 505106414
Fri Nov 15, 2019 11:57 pm
Forum: Octet Exceptions
Topic: electron number in octet
Replies: 8
Views: 178

Re: electron number in octet

Can anyone sum up the exceptions into one post so I can memorize?
by 505106414
Fri Nov 15, 2019 11:56 pm
Forum: Student Social/Study Group
Topic: Chemistry News
Replies: 65
Views: 48084

Re: Chemistry News

Jose Robles 1D wrote:https://www.sciencedaily.com/releases/2019/11/191104130450.htm

Interesting article that I thought you should look at.


For anyone who is feeling lazy, the article is titled: Light-based 'tractor beam' assembles materials at the nanoscale
by 505106414
Fri Nov 15, 2019 11:56 pm
Forum: Student Social/Study Group
Topic: Chemistry News
Replies: 65
Views: 48084

Re: Chemistry News

Muj_Rahman_3B wrote:Researchers have been using two different types of brain scanners on babies to check, as the title says, their "brain chemistry." Here's it is.

https://www.sciencedaily.com/releases/2 ... 160940.htm


Thats interesting!
by 505106414
Fri Nov 15, 2019 11:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: regions of electron density
Replies: 7
Views: 62

Re: regions of electron density

Basically an atom that has electron lone pairs or is sharing electrons I believe.
by 505106414
Fri Nov 08, 2019 2:02 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question regarding definition of molecules
Replies: 5
Views: 184

Re: Question regarding definition of molecules

A mole is the SI unit for a quantity of something
by 505106414
Fri Nov 08, 2019 2:01 pm
Forum: Electronegativity
Topic: Website
Replies: 3
Views: 90

Re: Website

McKenna_4A wrote:I can't log into Dr. Lavelle's website. I enter my password and it just loads for a second and nothing happens. I don't get any "wrong password" notification or anything. Anybody else having this problem/have a solution?


Switch your browser to chrome or safari.
by 505106414
Fri Nov 08, 2019 2:00 pm
Forum: Lewis Structures
Topic: Midterm grades
Replies: 26
Views: 386

Re: Midterm grades

VioletKo3F wrote:Does anyone know if we'll get the actual midterm back? Or is it only our grades?


You should get the whole midterm back.
by 505106414
Fri Nov 08, 2019 1:59 pm
Forum: SI Units, Unit Conversions
Topic: Converting SI units
Replies: 3
Views: 145

Re: Converting SI units

Do we need to write out and cross out every unit or is it safe to skip a few of these steps as long as our answer is in the correct unit?
by 505106414
Fri Nov 08, 2019 1:44 pm
Forum: Lewis Structures
Topic: Formal Charges
Replies: 15
Views: 144

Re: Formal Charges

Is it okay to break the octet rule in order to minimize formal charge?
by 505106414
Thu Oct 31, 2019 9:58 am
Forum: Photoelectric Effect
Topic: Work Function
Replies: 9
Views: 137

Re: Work Function

Is work function, Φ used in any other equations besides the KE/Energy of a photon one?
by 505106414
Thu Oct 31, 2019 9:55 am
Forum: Photoelectric Effect
Topic: kinetic energy
Replies: 6
Views: 89

Re: kinetic energy

Kinetic energy + O[strike] = the energy of a photon? What is the O with a strike through it representing?
by 505106414
Thu Oct 31, 2019 9:54 am
Forum: Properties of Electrons
Topic: Formal Charge of an Atom
Replies: 5
Views: 105

Re: Formal Charge of an Atom

Can you explain what the lone pairs part of the equation means and maybe give an example? Thank you!
by 505106414
Thu Oct 31, 2019 9:53 am
Forum: Einstein Equation
Topic: Joules units
Replies: 6
Views: 296

Re: Joules units

So the units are essentially equivalent to each other?
by 505106414
Thu Oct 31, 2019 9:51 am
Forum: Properties of Light
Topic: All the formulas
Replies: 5
Views: 90

Re: All the formulas

Vuong_4G wrote:Not sure if this is what you're looking for but...

c =
E(photon) = h
m* = E(photon) -
= h/p


Could you explain wavelength = h/p to me please?
by 505106414
Thu Oct 31, 2019 9:47 am
Forum: Properties of Light
Topic: All the formulas
Replies: 5
Views: 90

Re: All the formulas

Will we ever use wavelength x frequency = velocity? or will it always be =c(speed of light)
by 505106414
Thu Oct 24, 2019 1:42 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Energy of spdf orbitals
Replies: 11
Views: 129

Re: Energy of spdf orbitals

Can someone explain what a shell is vs a subshell?
by 505106414
Thu Oct 24, 2019 1:41 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 4749

Re: Test 1 [ENDORSED]

Will any of the content from test 1 be on the midterm and/or test 2?
by 505106414
Thu Oct 24, 2019 1:40 pm
Forum: Electronegativity
Topic: How to determine which bond is more covalent?
Replies: 2
Views: 336

Re: How to determine which bond is more covalent?

Any other tips for what to study/how to prepare for test two?
by 505106414
Thu Oct 24, 2019 1:40 pm
Forum: Lewis Structures
Topic: Ion lewis structure
Replies: 9
Views: 94

Re: Ion lewis structure

Emily_4B wrote:Is there any case where the atoms lewis structure doesn’t have a full octet?

I also was wondering about this question? Are there any exceptions to the rules that we should memorize?
by 505106414
Thu Oct 24, 2019 1:39 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 18
Views: 2835

Re: Trend of Electronegativity

In discussion someone mentioned a noble gas rule/shortcut when we were discussing periodic table trends? Does this relate to electronegativity? If not, can someone explain what it is?
by 505106414
Thu Oct 24, 2019 1:36 pm
Forum: Ionic & Covalent Bonds
Topic: strength of bonds
Replies: 11
Views: 265

Re: strength of bonds

Is an ionic or a covalent bond typically stronger?
by 505106414
Wed Oct 16, 2019 5:38 pm
Forum: Einstein Equation
Topic: kJ/mol
Replies: 4
Views: 95

Re: kJ/mol

I have a question regarding one of the post assessment questions (28b) from the atomic spectra module. In this problem, the units kJ/mol are used. In solving it, I just thought to use the kJ->J conversion but still ended up with the wrong answer. I'm not sure if I made just a calculation mistake or...
by 505106414
Wed Oct 16, 2019 5:36 pm
Forum: DeBroglie Equation
Topic: De Broglie Wavelength
Replies: 7
Views: 109

Re: De Broglie Wavelength

I think it just means to use the De Broglie equation because the De Broglie equation is derived from the equations E=pc, c= wavelength*frequency, and E=hv which we have learned before. However, this equation only works for any particle with a rest mass, momentum, and wavelength so if it asks for th...
by 505106414
Wed Oct 16, 2019 5:35 pm
Forum: Trends in The Periodic Table
Topic: electronegativity
Replies: 10
Views: 2432

Re: electronegativity

Electronegativity is related to the electron-pulling ability of an atom. Elements at the top right corner of the periodic table have the highest electronegativity, meaning that electronegativity increases as you move right across the table and decreases as you move down. I have been looking for an ...
by 505106414
Wed Oct 16, 2019 5:33 pm
Forum: *Shrodinger Equation
Topic: What is Shrodinger's for?
Replies: 6
Views: 73

Re: What is Shrodinger's for?

Schrodinger's equation predicts future dynamic systems via calculating the partial differentiation of wave functions, or how the electron will behave around its nucleus. Most likely, you will not have to calculate anything with the equation itself, but you should at least know what each part of the...
by 505106414
Wed Oct 16, 2019 5:32 pm
Forum: Properties of Light
Topic: Difference between Quanta and photons?
Replies: 6
Views: 71

Re: Difference between Quanta and photons?

Sam McNeill 3A wrote:A photon is the quanta, or smallest measurement, of light.


What unit is this measurement in?
by 505106414
Thu Oct 10, 2019 11:47 pm
Forum: Significant Figures
Topic: Question About Significant Figures and Rounding
Replies: 22
Views: 800

Re: Question About Significant Figures and Rounding

Is anyone familiar with Dr. Lavelle's rule for rounding to the nearest even number when there are 4 sig figs and you can only have 3? I don't think I've heard him talk about this. Is this a rule that isn't standard, but Dr. Lavelle wants us to apply? And what do you mean by the nearest even number ...
by 505106414
Thu Oct 10, 2019 11:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 158
Views: 111577

Re: Advice from a Medical Student [ENDORSED]

Do you recommend taking chem 17 before chem 14a?
by 505106414
Thu Oct 10, 2019 11:43 pm
Forum: DeBroglie Equation
Topic: How to know which equation to use
Replies: 9
Views: 154

Re: How to know which equation to use

What is a real-world application of this equation?
by 505106414
Thu Oct 10, 2019 11:41 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 118
Views: 31181

Re: Final Jitters

Getting a good night's sleep is huge! If you've been studying for hours, just go to bed!! Give your brain some time to process everything in the meantime.
by 505106414
Thu Oct 10, 2019 11:40 pm
Forum: Significant Figures
Topic: Question About Significant Figures and Rounding
Replies: 22
Views: 800

Re: Question About Significant Figures and Rounding

Is anyone familiar with Dr. Lavelle's rule for rounding to the nearest even number when there are 4 sig figs and you can only have 3?
by 505106414
Thu Oct 10, 2019 11:38 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 53
Views: 3080

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

What was the scam for workshops that Dr. Lavelle mentioned in lecture? Something to do with asking for our phone numbers?
by 505106414
Thu Oct 10, 2019 11:36 pm
Forum: Trends in The Periodic Table
Topic: ionization energy
Replies: 11
Views: 465

Re: ionization energy

When would I use this in a calculation, like what would the problem be asking?
by 505106414
Thu Oct 03, 2019 10:19 am
Forum: Administrative Questions and Class Announcements
Topic: Tips for Tests [ENDORSED]
Replies: 4
Views: 95

Re: Tips for Tests [ENDORSED]

I spoke with one of the UA's and went to their Step-Up session on Tuesday and they really recommended taking advantage of the resources available. For instance, the Step-Up session really helped me solidify my confidence in certain skills and identify areas I am weaker in. They gave us a bunch of p...
by 505106414
Thu Oct 03, 2019 10:17 am
Forum: Administrative Questions and Class Announcements
Topic: Will there be lecture on Nov. 27?
Replies: 3
Views: 95

Re: Will there be lecture on Nov. 27?

It is looking like I will have to fly home on the Tuesday before Thanksgiving too. Will I be penalized for missing lecture?
by 505106414
Thu Oct 03, 2019 10:15 am
Forum: Administrative Questions and Class Announcements
Topic: First Test in Discussion
Replies: 13
Views: 260

Re: First Test in Discussion

Do we need to bring any materials/resources to the test? Calculator, Periodic Table, etc?
by 505106414
Thu Oct 03, 2019 10:13 am
Forum: SI Units, Unit Conversions
Topic: Homework for Week 1
Replies: 16
Views: 334

Re: Homework for Week 1

Does anyone know if we will get our homework back with comments or corrections from our ta?
by 505106414
Thu Oct 03, 2019 10:10 am
Forum: Significant Figures
Topic: Significant Figures
Replies: 10
Views: 266

Re: Significant Figures

Here are a couple rules I found online: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. My question: When you say 'any zeros between two significant digits are significant',...

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