Search found 52 matches
- Sun Dec 08, 2019 11:50 pm
- Forum: General Science Questions
- Topic: Coordination Compounds
- Replies: 7
- Views: 613
Re: Coordination Compounds
Students who previously took this class have told me that anything on his slides is fair game for tests, so it would probably be helpful to familiarize yourself with some of the examples from class, like cisplatin and heme complexes.
- Sun Dec 08, 2019 11:47 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric vs Amphiprotic
- Replies: 13
- Views: 1552
Re: Amphoteric vs Amphiprotic
Mai V 3E wrote:Does anyone have a video they think is a good reference for this topic?.
I found that this video gave a quick, comprehensive definition of amphoteric molecules with examples: https://www.youtube.com/watch?v=_t_4cCi8jiI
- Sun Dec 08, 2019 11:44 pm
- Forum: *Titrations & Titration Calculations
- Topic: Types of Titrations
- Replies: 2
- Views: 839
Types of Titrations
What are the possible types of titrations? What is the difference between neutral and ionized titrations?
- Sun Dec 08, 2019 11:41 pm
- Forum: Resonance Structures
- Topic: Delocalization
- Replies: 6
- Views: 617
Re: Delocalization
Any structure that has resonance has delocalization and these bond lengths are in between that of single bonds and double bonds.
- Sun Dec 08, 2019 11:37 pm
- Forum: Hybridization
- Topic: Identifying Hybrid Orbitals
- Replies: 5
- Views: 477
Identifying Hybrid Orbitals
Does anyone have any tips for remembering or identifying the hybrid orbitals of compounds?
- Sun Dec 01, 2019 10:31 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Studying for final exam
- Replies: 8
- Views: 664
Re: Studying for final exam
If you have class notes, it would also be helpful to review them since anything from his lecture slides could be on the final as well.
- Sun Dec 01, 2019 10:25 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation Number
- Replies: 9
- Views: 793
Re: Oxidation Number
How would we know the oxidation number if the formula is just given? Certain ions have fixed oxidation states like oxygen is always (2-) and SO4 is always ((2-) and CN is always (-1) and so on. Molecules like H2O and gases like HOFBRINCl have an oxidation number of (0). https://d2jmvrsizmvf4x.cloud...
Re: Chelating
A ligand is called a chelate when it binds to two or more sites. In the “endorsed posts” section there is a topic about chelating that explains it in detail that would be helpful to look at. :)
- Sun Dec 01, 2019 10:10 pm
- Forum: Student Social/Study Group
- Topic: Studying for Final
- Replies: 7
- Views: 766
Re: Studying for Final
I think that going over each unit outline will be a good way to review the big ideas of each topic we should know for the test. Also doing the practice problems again would probably be helpful.
- Sun Dec 01, 2019 10:08 pm
- Forum: Air Pollution & Acid Rain
- Topic: Formation of Acid Rain
- Replies: 5
- Views: 697
Re: Formation of Acid Rain
Acid rain is the result of chemical reactions with water and carbon dioxide, sulfur dioxide, or nitrogen oxides that results in the formation of an acid, respectively, carbonic acid, sulfurous acid, and nitrogen acids. During lecture examples that involved sulfur dioxide and nitrogen oxides were used.
- Sun Nov 24, 2019 6:29 pm
- Forum: Hybridization
- Topic: How to Determine Hybridization
- Replies: 2
- Views: 349
How to Determine Hybridization
I am still a little confused about determining when hybridization would occur, does anyone have any tips for memorizing when a molecule would have hybridization and how many hybrid orbitals there would be?
- Sun Nov 24, 2019 6:24 pm
- Forum: Hybridization
- Topic: stability in hybridization
- Replies: 4
- Views: 306
Re: stability in hybridization
In general, the more s-character properties in hybridization, the stronger the bonds will be. Therefore, as stated in the previous posts, bonding between sp2 hybridizations would be stronger than bonding in sp3 hybridization.
- Sun Nov 24, 2019 6:10 pm
- Forum: Naming
- Topic: Order in Naming
- Replies: 12
- Views: 767
Re: Order in Naming
For coordinate compounds, the order of the atomic symbols does matter. The ligand names would be in alphabetical order (either using their prefixes or the name of the element), followed by the name of the transition metal cation name.
- Sun Nov 24, 2019 6:07 pm
- Forum: Biological Examples
- Topic: Drawing Structures on Final
- Replies: 3
- Views: 302
Drawing Structures on Final
Would we need to know how to draw structures of some of the biological examples that Dr. Lavelle gives in class for the final?
- Sun Nov 24, 2019 5:58 pm
- Forum: Naming
- Topic: Oxidation Numbers
- Replies: 4
- Views: 437
Re: Oxidation Numbers
To calculate the oxidation number for a metal in a compound, you would usually be able to do this by finding the overall charge of the molecule and then subtracting the total charge of the anions. The difference would be the charge of the metal.
- Sun Nov 24, 2019 5:52 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Drawing sigma & Pi bonds
- Replies: 7
- Views: 664
Re: Drawing sigma & Pi bonds
For the final, would we actually need to be able to draw the shape of the molecules and show the sigma and pi bonds?
- Mon Nov 18, 2019 12:12 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 6
- Views: 448
Re: Test 2
Test 2 will cover everything from the midterm up until the information from Monday's (11/18) lecture, which includes intermolecular forces, VSEPR, and sigma and pi bonding.
- Mon Nov 18, 2019 12:07 am
- Forum: Bond Lengths & Energies
- Topic: Test 2 Topics
- Replies: 40
- Views: 2365
Re: Test 2 Topics
Will we need to have the specific bond angles for each molecular shape memorized for Test 2?
- Mon Nov 18, 2019 12:04 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lewis Structures
- Replies: 3
- Views: 245
Re: Lewis Structures
I may be wrong, but I believe that Dr. Lavelle said it is acceptable if we draw Lewis structures without showing the molecular shape as Lewis structures are meant to simply model the bonding and lone pairs.
- Mon Nov 18, 2019 12:02 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bonds in VSEPR
- Replies: 11
- Views: 661
Re: Bonds in VSEPR
When determining molecular shape with the VSEPR model, single, double, and triple bonds are all considered to be one area of electron density. This means that regardless of the type of bond, the shape would still be determined as if there was a single bond there.
- Mon Nov 18, 2019 12:00 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Additional lone pairs
- Replies: 2
- Views: 237
Re: Additional lone pairs
A good example of this would be H20 which due to the two lone pairs on the oxygen takes on a bent shape with bond angles < 109.5 degrees.
- Sun Nov 17, 2019 9:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR model for ions
- Replies: 2
- Views: 200
Re: VSEPR model for ions
Ions should follow the same guidelines but may differ from their nonionic counterparts due to the presence of absence of lone pairs.
- Sun Nov 17, 2019 9:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 290
Re: Bond Angles
Does anyone know if we would be tested on specific bond angles on Test 2?
- Sun Nov 17, 2019 9:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape of H20
- Replies: 3
- Views: 331
Re: Molecular Shape of H20
The molecular shape for H2O is bent because the lone pairs will repel each other more than they repel the bonded pairs. Most often Lewis structures of H2O are drawn with the two lone pairs angled above the oxygen, so this might be a more helpful way of drawing the structure so you remember that the ...
- Sun Nov 17, 2019 9:23 pm
- Forum: Dipole Moments
- Topic: Dipole Moments
- Replies: 3
- Views: 328
Re: Dipole Moments
To add on to the other responses, there will be a stronger dipole moment when there is a greater electronegative difference between the two atoms.
- Sun Nov 17, 2019 3:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR shape question
- Replies: 2
- Views: 121
Re: VSEPR shape question
If the central atom has two bonding pairs and no line pairs it would be linear.
- Sun Nov 03, 2019 11:01 pm
- Forum: Dipole Moments
- Topic: Exceptions for Polarity
- Replies: 1
- Views: 435
Re: Exceptions for Polarity
Thank you for this tip! Does anyone have any similar tips for determining if a molecule is polar without being given the electronegativity values for atoms? Also, will we be provided with these values on the midterm?
- Sun Nov 03, 2019 10:56 pm
- Forum: Lewis Structures
- Topic: Drawing lewis structures
- Replies: 5
- Views: 234
Re: Drawing lewis structures
The structure that has the lowest net formal charge is the most probable structure, however, it is important to note that some individual atoms may prefer to have a +/- formal charge due to their electronegativity relative to the other atoms in the molecule. For example, an oxygen atom with a 1- cha...
- Sun Nov 03, 2019 10:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: HW 5
- Replies: 1
- Views: 144
Re: HW 5
I believe that we should do problems from Outline 3: Chemical Bonds since that is most applicable to what we have been learning in lecture.
- Sun Nov 03, 2019 10:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterms
- Replies: 6
- Views: 445
Re: Midterms
Yes, on his website there is a test and exam schedule and we only have one midterm, but we have Test 2 beginning the week of November 19.
- Sun Nov 03, 2019 7:45 pm
- Forum: Ionic & Covalent Bonds
- Topic: Homework 2A.9
- Replies: 2
- Views: 188
Homework 2A.9
Which M^2+ ions (where M is a metal) are predicted to have the following ground-state electron configurations?
(a) [Ar]3d^7
(b) [Ar]3d^6
The answer in the solutions manual is (a) Co^2+ and (b) Fe^2+, but can someone explain how to get these answers?
(a) [Ar]3d^7
(b) [Ar]3d^6
The answer in the solutions manual is (a) Co^2+ and (b) Fe^2+, but can someone explain how to get these answers?
- Sat Nov 02, 2019 7:16 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm
- Replies: 28
- Views: 1374
Re: Midterm
Do we need to memorize ions and ionic compounds for the midterm and other tests? Specifically will we have to identify the formula and charge of an ion/compound given the name?
- Sun Oct 27, 2019 12:50 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Checking bonding
- Replies: 3
- Views: 217
Re: Checking bonding
I don't think so since even checking formal charge I don't think can tell you if you're correct - it can just tell you which potential lewis structures are better/more likely to be correct. But, when it comes to figuring out a good lewis structure that is likely to be experimentally correct, you ca...
- Sun Oct 27, 2019 12:40 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Stability
- Replies: 9
- Views: 570
Re: Stability
For it to be considered more stable, is it the central element that has to be closest to 0 or the surrounding ones as well? Ideally, the central element and all the other elements should have a formal charge of zero or close to zero because this would indicate that the electrons are evenly distribu...
- Wed Oct 23, 2019 8:58 pm
- Forum: Trends in The Periodic Table
- Topic: Question 1F.3
- Replies: 5
- Views: 320
Re: Question 1F.3
The order would be P^3- > S^2- > Cl- Across a period, atomic radius decreases because the positive charge of the nucleus increases, therefore increasing the pull on the electrons. Since electrons are added, the net positive pull on all the electrons decreases (the positive charge has to spread out o...
- Wed Oct 23, 2019 8:43 pm
- Forum: DeBroglie Equation
- Topic: When to use DeBroglie Equation
- Replies: 16
- Views: 718
Re: When to use DeBroglie Equation
As stated in the previous replies, the DeBroglie equation can only be used for objects that have rest mass, which does not apply to light. The equations λν = c or the E = hν are applicable to light. Is light the only thing without rest mass? And I'm also confused as to how rest mass apply to electr...
- Wed Oct 23, 2019 4:37 pm
- Forum: Einstein Equation
- Topic: HW 1B. 7
- Replies: 6
- Views: 456
Re: HW 1B. 7
In the equation for part a derived in the solution manual, I understand the derivation and application, but where does the ^-1 come from? (the equation given is E=hcλ^-1)
- Sun Oct 20, 2019 10:51 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Applying Pauli Exclusion Principle and Hund's Rule
- Replies: 5
- Views: 398
Applying Pauli Exclusion Principle and Hund's Rule
I understand the definitions of the Pauli Exclusion Principle and Hund’s Rule, but can someone clarify how they are applied. Thank you!
- Sun Oct 20, 2019 9:17 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: p- & d- orbitals
- Replies: 2
- Views: 125
Re: p- & d- orbitals
Nodal planes are areas in which the probability of finding an electron is zero, which can be found using the Schrodinger equation.
- Sun Oct 20, 2019 9:14 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: electron configuration exceptions
- Replies: 3
- Views: 115
Re: electron configuration exceptions
Along with being able to recognize the exceptions and write them, it is probably helpful to understand the reasoning behind the exceptions. The reason why the electron configurations in the post before this one ([Ar]3d^5 4s^1, Cu: [Ar] 3d^10 4s^1, Mo: [Kr] 4d^5 5s^1, and Ag: [Kr]4d^10 5s^1) are writ...
- Sun Oct 20, 2019 9:07 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Exceptions
- Replies: 5
- Views: 350
Re: Electron Configuration Exceptions
Debora Fernandez Clemente_ 4H wrote:What is the partial full one you are referring to in these exceptions?
I think what is meant by the partially full shell is referring to the d sub-shell. A full or half full d shell is more stable than a partially filled d shell.
- Sun Oct 20, 2019 2:22 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Nodal Planes
- Replies: 6
- Views: 230
Re: Nodal Planes
S-orbitals have electrons that are distributed spherically symmetrical around the nucleus so while they do not have any nodal planes, the s-orbital does have radial nodes. The 1s orbital would not have any nodes, but the 2s orbital would have one node, the 3s orbital would have two nodes, etc.
- Sun Oct 13, 2019 3:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
- Replies: 53
- Views: 6210
Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
If we need to leave early from a workshop would that be okay? During lecture, Dr. Lavelle said that the Peer Learning sections were designed to be flexible so we can come in and leave at any time, but I don't know if this applied to workshops as well.
- Sun Oct 13, 2019 2:59 pm
- Forum: Balancing Chemical Reactions
- Topic: Any Easy Way
- Replies: 10
- Views: 609
Re: Any Easy Way
There is no "one way" of balancing equations, but some helpful tips would be to start by balancing elements that have the greatest number of atoms in the reactants or products, other than hydrogen and oxygen. I usually balance oxygen or hydrogen last and if both are in the reactants or pro...
- Sun Oct 13, 2019 2:54 pm
- Forum: Student Social/Study Group
- Topic: Turning in Extra HW problems
- Replies: 10
- Views: 465
Re: Turning in Extra HW problems
Drake Choi_1I wrote:Is it effective to do the whole homework list? Or should I focus on doing a few problems from each section?
It is probably helpful to do all the homework problems so that you have practice with the concepts and the style of questions, which will probably helpful for tests.
- Sun Oct 13, 2019 2:38 pm
- Forum: DeBroglie Equation
- Topic: When to use DeBroglie Equation
- Replies: 16
- Views: 718
Re: When to use DeBroglie Equation
As stated in the previous replies, the DeBroglie equation can only be used for objects that have rest mass, which does not apply to light. The equations λν = c or the E = hν are applicable to light.
- Sun Oct 13, 2019 2:27 pm
- Forum: Properties of Electrons
- Topic: Balmer and Lyman Series
- Replies: 3
- Views: 271
Re: Balmer and Lyman Series
The grouping of the lines in the Lyman and Balmer Series corresponds to the states that hydrogen starts and ends in as well as the type of electromagnetic radiation is emitted. The Balmer Series are the energy transitions that involve the n=2 state of hydrogen and are all part of the visible light s...
- Mon Oct 07, 2019 12:05 am
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 156797
Re: Reading the textbook
Are there a lot of topics in the book that are not covered during lecture that show up on tests?
- Mon Oct 07, 2019 12:03 am
- Forum: SI Units, Unit Conversions
- Topic: Test 1
- Replies: 9
- Views: 492
Re: Test 1
I believe that anything we went over in class or anything that we did in the homework is fair game for the test, except for the quantum topics.
- Sun Oct 06, 2019 11:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 8485
Re: Week 2 Homework Problems [ENDORSED]
Abraham De Luna wrote:He specified to do either fundamentals or quantum world for homework 2.
Would there be any benefit to do one or the other, such as if one would better prepare us for a test or quiz?
- Sun Oct 06, 2019 11:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Specific type of calculator for tests?
- Replies: 6
- Views: 361
Re: Specific type of calculator for tests?
Does anyone know if there is a resource to find an approved list of calculators?
- Sun Oct 06, 2019 11:53 pm
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 7434
Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Is it recommended to just show all of our work when possible? Also, do we need to include the specifications for the element/compound in our calculations?