Search found 50 matches
- Mon Dec 02, 2019 8:20 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pH and pKa
- Replies: 2
- Views: 263
pH and pKa
In lecture today, Lavelle went over an example question where he asked whether the acid was neutral or negatively charged at pH=6 based on the pKa value of the acid. Could someone explain why exactly it would be negatively charged? Thank you!
- Mon Dec 02, 2019 7:32 pm
- Forum: Lewis Acids & Bases
- Topic: Acid Strength
- Replies: 4
- Views: 426
Re: Acid Strength
Thank you for that clarification. How does one determine if an anion is more stable than another?
- Mon Dec 02, 2019 6:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grades
- Replies: 15
- Views: 1068
Re: Grades
According to Lavelle's syllabus, you need a 50% to pass with a C-. Hope this helps!
- Mon Dec 02, 2019 6:34 pm
- Forum: Lewis Acids & Bases
- Topic: Acid Strength
- Replies: 4
- Views: 426
Acid Strength
Could someone clarify how to determine acid strength? Lavelle mentioned in lecture that HF < HCl < HBr < HI; why exactly is that? Thank you!
- Sun Dec 01, 2019 9:14 pm
- Forum: Hybridization
- Topic: 2F.3
- Replies: 3
- Views: 207
Re: 2F.3
They use that resonance structure because the formal charge is lower! Hope this helps.
- Sun Dec 01, 2019 9:13 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Final Study Methods
- Replies: 11
- Views: 683
Re: Final Study Methods
Reading the textbook is always a good way to reinforce information, especially since a lot of the midterm questions were conceptual. Attending step up sessions and workshops are always really helpful to practice. Hope this helps!
- Sun Dec 01, 2019 9:12 pm
- Forum: Hybridization
- Topic: Order When Writing
- Replies: 5
- Views: 315
Re: Order When Writing
Both are correct! Lavelle seems to like the notation with d in the beginning. Either way, you wouldn't get marked down for using one instead of the other. Hope this helps!
- Sun Dec 01, 2019 9:10 pm
- Forum: Bronsted Acids & Bases
- Topic: Water as an acid and base
- Replies: 7
- Views: 602
Re: Water as an acid and base
Water can act as both a proton acceptor and a proton donator. It can both accept a proton and become a hydronium ion (thus acting as a base), and donate a proton and become a hydroxide ion (thus acting as an acid). Hope this helps!
- Sun Dec 01, 2019 9:08 pm
- Forum: Naming
- Topic: How to Know the Charge of Ions
- Replies: 7
- Views: 503
Re: How to Know the Charge of Ions
I think the best way to determine ion charges is just to memorize them :/ it's a bit tedious, but if you just go through some flashcards with them you'll be able to familiarize yourself with them in no time. Hope this helps!
- Sun Nov 24, 2019 11:33 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strong acids vs weak acids
- Replies: 8
- Views: 526
Re: Strong acids vs weak acids
Yes! I believe the list of strong bases is a bit longer than that of strong acids, but the same concept applies. Hope this helps!
- Sun Nov 24, 2019 11:31 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strong acids vs weak acids
- Replies: 8
- Views: 526
Re: Strong acids vs weak acids
Most acids are considered weak because few acids actually fully dissolve into ions. It would be easiest to just memorize the strong acids (for example HCl, HBr, and so on) to understand which ones WILL fully dissolve. If an acid isn't a part of that list, it's likely a weak acid.
- Sun Nov 24, 2019 11:29 pm
- Forum: DeBroglie Equation
- Topic: Studying Methods
- Replies: 1
- Views: 249
Re: Studying Methods
I believe that if you attend workshops that are run by the TAs, they will give you worksheets to work on for practice.
- Sun Nov 24, 2019 11:28 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strong acids vs weak acids
- Replies: 8
- Views: 526
Re: Strong acids vs weak acis
Weak acids will have higher pH values than strong acids. A weak acid is an acid which partially dissociates into ions in an aqueous solution, while a strong acid will fully dissociate into ions. A common example of a weak acid is acetic acid. HCl is a common example of a strong acid.
- Sat Nov 16, 2019 2:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: All VSEPR structures or just ones from class?
- Replies: 11
- Views: 656
Re: All VSEPR structures or just ones from class?
I think it's best to memorize all of them. He just exemplified how we can figure out the shapes in lecture from the basic ones.
- Sat Nov 16, 2019 2:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Pyramid vs Trigonal Planar
- Replies: 6
- Views: 475
Re: Trigonal Pyramid vs Trigonal Planar
They are different shapes! Trigonal planar has three regions of electron density, all being bonded pairs. Trigonal pyramidal has four regions of electron density, but with three bonded pairs and one lone pair. Hope this helps!
- Sun Nov 10, 2019 10:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 7
- Views: 472
Re: Test 2
It will be on material from after the midterm. And the test will be during Week 8 in your discussion. Hope this helps.
- Sun Nov 10, 2019 10:15 pm
- Forum: General Science Questions
- Topic: Test 2
- Replies: 20
- Views: 851
Re: Test 2
No, it should only cover material from after the midterm! Hope this helps.
- Sun Nov 10, 2019 10:13 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: central atom
- Replies: 21
- Views: 1043
Re: central atom
Yes, ideally the central atom should have a formal charge of 0. This is because we want the central atom to be the least electronegative atom of the molecule.
- Sun Nov 10, 2019 10:11 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 58
- Views: 4575
Re: Study Tips
I would do all of the homework problems that are assigned, as I found that very helpful for preparing for tests. Additionally, the review sessions and step-up workshops are always a great resource and provide a different perspective on the material to be learned. Hope this helps!
- Sun Nov 10, 2019 10:10 pm
- Forum: Lewis Structures
- Topic: Midterm grades
- Replies: 26
- Views: 1454
Re: Midterm grades
If I recall correctly, Lavelle said he would be returning them this coming Wednesday. Hope this helps!
- Sun Nov 10, 2019 10:08 pm
- Forum: Student Social/Study Group
- Topic: Midterm Average
- Replies: 12
- Views: 837
Re: Midterm Average
I believe he will be showing the average sometime in lecture this week.
- Sun Nov 10, 2019 10:07 pm
- Forum: Bond Lengths & Energies
- Topic: Week 7 Homework
- Replies: 15
- Views: 867
Re: Week 7 Homework
I'm thinking that turning in Chem Bonding questions would make more sense since we haven't actually gone over any new Chapters/materials. Hope this helps!
- Sun Nov 10, 2019 10:04 pm
- Forum: Bond Lengths & Energies
- Topic: test 2
- Replies: 16
- Views: 906
Re: test 2
I believe it will only cover what we learn after the midterm. If he does include anything from before, it may just be chemical bonding topics. Hope this helps!
- Sat Nov 02, 2019 3:14 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 7593
Re: Advice for studying
I feel like going through the concepts in the book is always helpful to clarify any questions you may have on topics. I think practicing is the biggest thing you can do to prepare. Go through the assigned homework problems as well as any practice midterm questions (like the dino nuggets questions) t...
- Sat Nov 02, 2019 3:11 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Moles and Molar Mass
- Replies: 2
- Views: 347
Re: Moles and Molar Mass
Atomic weight is quite literally the weight of an atom, and this is given on the periodic table so you won't have to calculate it yourself. As for molecular weight, this refers to the mass of a given molecule, which can contain many atoms. To find the molecular weight, you would add the atomic masse...
- Sat Nov 02, 2019 3:09 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Cu and Cr
- Replies: 11
- Views: 582
Re: Cu and Cr
Yes the trend continues! Hope this helps.
- Sat Nov 02, 2019 3:08 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm
- Replies: 28
- Views: 1331
Re: Midterm
It will be everything covered in lecture up until the very last slide on Friday's lecture. In other words, Fundamentals, Quantum, and some of Chemical Bonding. Hope this helps.
- Sat Nov 02, 2019 3:07 pm
- Forum: Lewis Structures
- Topic: Midterm Topics
- Replies: 8
- Views: 258
Re: Midterm Topics
Lavelle said it would be everything covered in lecture up until the very last slide on Friday's lecture. Hope this helps.
- Sat Nov 02, 2019 3:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Midterm
- Replies: 6
- Views: 314
Re: Midterm
Hi there! I highly doubt we will be tested on it on the midterm because we did not go over it in lecture. I believe he mentioned that sometime in lecture. Hope this helps!
- Sun Oct 27, 2019 9:19 pm
- Forum: Student Social/Study Group
- Topic: Midterm Length
- Replies: 7
- Views: 402
Re: Midterm Length
The only thing about length mentioned is that we will be given two hours to take the exam (from 6-8).
- Sun Oct 27, 2019 9:18 pm
- Forum: General Science Questions
- Topic: Study Guides
- Replies: 6
- Views: 321
Re: Study Guides
I think your best bet would be checking out test banks that have previous exams so you have some sort of idea of what kind of questions will be asked. I think going over all the assigned problems would be a good idea as well.
- Sun Oct 27, 2019 9:16 pm
- Forum: Student Social/Study Group
- Topic: Midterm
- Replies: 7
- Views: 498
Re: Midterm
I believe it will cover the quantum chapter and perhaps the bonding chapter (correct me if I am wrong). Beyond that, I'm not too sure what format it will be, but I think it would be reasonable to assume that the difficulty of the qs would be alike to the difficulty of the qs from the first test!
- Sun Oct 27, 2019 9:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Powerpoint Slides
- Replies: 5
- Views: 183
Re: Powerpoint Slides
He doesn't post his slides, sorry.
- Sun Oct 27, 2019 9:13 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic v. Covalent
- Replies: 7
- Views: 253
Re: Ionic v. Covalent
Ionic bonds are formed between metals and nonmetals in which electrons are lost and gained. Covalent bonds occur between nonmetals and nonmetals in which electrons are shared.
- Sun Oct 27, 2019 9:09 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Useful YouTube videos?
- Replies: 6
- Views: 275
Re: Useful YouTube videos?
Hey! I think Bozeman science makes really wonderful videos that are often times very insightful and extremely helpful. I use them a lot, and I think they've really helped my understanding of chemistry. Hope this helps!
- Thu Oct 17, 2019 7:45 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: quantum number topic
- Replies: 4
- Views: 274
Re: quantum number topic
Hi there! First off, quantum numbers don't necessarily "do" anything but they do play an important role in helping us identifying the position and orientation of electrons. l describes the shape, and it can be any number that is n-1. m labels different orbitals of a subshell (orientation),...
- Thu Oct 17, 2019 7:38 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 7593
Re: Advice for studying
Hey! I've been making sure that I watch the online modules and then completing the post assessments first in order to see what topics are my strengths and what topics are my weaknesses. After, I make sure to do all the homework problems Dr. Lavelle assigns, and I go over them again to make sure I ac...
- Wed Oct 16, 2019 11:06 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: What is Molarity?
- Replies: 11
- Views: 1052
Re: What is Molarity?
Molarity as a unit is defined as moles per liter (mol/L). Molarity is basically the concentration. The higher the concentration, the more solutes are present in the solution. Hope this helps!
- Wed Oct 16, 2019 11:04 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]
- Replies: 5
- Views: 405
Re: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]
I believe the x is representative for the plane. There are three planes, x, y, and z. Hope that helps.
- Wed Oct 16, 2019 11:02 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 3552
Re: Best Way To Study?
Hey there! I think watching the modules online and then doing the post assessments as a form of self evaluation is really helpful. After doing that, I do all of the textbook practice problems and ensure that I understand how to work through literally all of them. The textbook excerpts can also be he...
- Wed Oct 09, 2019 12:06 am
- Forum: SI Units, Unit Conversions
- Topic: Test 1
- Replies: 9
- Views: 484
Re: Test 1
Molarity and Dilution problems will be on the test as it was a part of the concepts that we went over in the Fundamentals chapter. I would say to just practice the problems in the G section of the assigned homework, and you'll be prepared.
- Wed Oct 09, 2019 12:02 am
- Forum: SI Units, Unit Conversions
- Topic: Test #1-Bruincard
- Replies: 4
- Views: 285
Re: Test #1-Bruincard
My TA did not ask for our Bruincards specifically, but you do need to be able to write your school ID on the test. So either have that memorized, or bring your Bruincard for reference.
- Wed Oct 09, 2019 12:01 am
- Forum: General Science Questions
- Topic: Test Question
- Replies: 8
- Views: 487
Re: Test Question
You'll need to know combustion reaction reactants and products. Other than that, our TA mentioned that any other molecular formulas that may be more complex are usually given to you on the test. That being said, it might be a good idea to eventually memorize polyatomic ions and understand how to for...
- Wed Oct 09, 2019 12:00 am
- Forum: SI Units, Unit Conversions
- Topic: Are there going to be any questions on this week's test regarding Quanta and Photons?
- Replies: 5
- Views: 347
Re: Are there going to be any questions on this week's test regarding Quanta and Photons?
We're only going to be seeing material from the Fundamentals Section on Test 1-- so no quanta and photons!
- Tue Oct 08, 2019 11:58 pm
- Forum: SI Units, Unit Conversions
- Topic: Knowing the atomic mass for test #1
- Replies: 4
- Views: 300
Re: Knowing the atomic mass for test #1
Yes, you will be provided with a periodic table which includes atomic masses for the test!
- Wed Oct 02, 2019 12:03 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Question on E27
- Replies: 4
- Views: 123
Re: Question on E27
First, find the molar mass of H20 (this should be 18.002g). Then, divide by Avogadro's number to convert into grams per mole.
- Wed Oct 02, 2019 12:00 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's Number [ENDORSED]
- Replies: 12
- Views: 827
Re: Avogadro's Number [ENDORSED]
You want to use Avogadro's Number in order to convert mols into atoms, molecules, or formula units. If the question wants you to do this, it will specify that they are looking for such units (atoms, molecules, formula units etc).
- Tue Oct 01, 2019 11:58 pm
- Forum: Significant Figures
- Topic: General Rules to Help with Sig Figs
- Replies: 18
- Views: 1059
Re: General Rules to Help with Sig Figs
Thanks so much for the refresher on sig fig rules! In number one, however, I think 5293 has four sig figs instead of five. Nonetheless, thanks again!
- Tue Oct 01, 2019 11:56 pm
- Forum: Empirical & Molecular Formulas
- Topic: 5 Homework Problems Due
- Replies: 21
- Views: 933
Re: 5 Homework Problems Due
You do five problems total! It's advised to do more than the required five problems for practice though.
- Mon Sep 30, 2019 7:44 pm
- Forum: Empirical & Molecular Formulas
- Topic: Homework Problem E.9c
- Replies: 5
- Views: 242
Homework Problem E.9c
(c) How many moles of water molecules are in 5.15 g of Epsom salts? I've been told that I should multiply 7 by (5.15g/246.48mol) to obtain the number of mols of water molecules; that being said, I can't exactly pinpoint why this is the way to solve this problem. Could anyone explain step by step how...