Search found 26 matches

by KTran 1I
Sun Nov 03, 2019 11:01 pm
Forum: Dipole Moments
Topic: Exceptions for Polarity
Replies: 1
Views: 15

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?
by KTran 1I
Sun Nov 03, 2019 10:56 pm
Forum: Lewis Structures
Topic: Drawing lewis structures
Replies: 5
Views: 23

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...
by KTran 1I
Sun Nov 03, 2019 10:32 pm
Forum: Administrative Questions and Class Announcements
Topic: HW 5
Replies: 1
Views: 15

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.
by KTran 1I
Sun Nov 03, 2019 10:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterms
Replies: 6
Views: 34

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.
by KTran 1I
Sun Nov 03, 2019 7:45 pm
Forum: Ionic & Covalent Bonds
Topic: Homework 2A.9
Replies: 2
Views: 11

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?
by KTran 1I
Sat Nov 02, 2019 7:16 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 28
Views: 143

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?
by KTran 1I
Sun Oct 27, 2019 12:50 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Checking bonding
Replies: 3
Views: 30

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...
by KTran 1I
Sun Oct 27, 2019 12:40 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Stability
Replies: 9
Views: 44

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...
by KTran 1I
Wed Oct 23, 2019 8:58 pm
Forum: Trends in The Periodic Table
Topic: Question 1F.3
Replies: 5
Views: 37

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...
by KTran 1I
Wed Oct 23, 2019 8:43 pm
Forum: DeBroglie Equation
Topic: When to use DeBroglie Equation
Replies: 16
Views: 98

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...
by KTran 1I
Wed Oct 23, 2019 4:37 pm
Forum: Einstein Equation
Topic: HW 1B. 7
Replies: 6
Views: 67

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)
by KTran 1I
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: 24

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!
by KTran 1I
Sun Oct 20, 2019 9:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: p- & d- orbitals
Replies: 2
Views: 13

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.
by KTran 1I
Sun Oct 20, 2019 9:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: electron configuration exceptions
Replies: 3
Views: 15

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...
by KTran 1I
Sun Oct 20, 2019 9:07 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Exceptions
Replies: 5
Views: 20

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.
by KTran 1I
Sun Oct 20, 2019 2:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 6
Views: 24

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.
by KTran 1I
Sun Oct 13, 2019 3:23 pm
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 42
Views: 1119

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.
by KTran 1I
Sun Oct 13, 2019 2:59 pm
Forum: Balancing Chemical Reactions
Topic: Any Easy Way
Replies: 10
Views: 57

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...
by KTran 1I
Sun Oct 13, 2019 2:54 pm
Forum: Student Social/Study Group
Topic: Turning in Extra HW problems
Replies: 10
Views: 76

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.
by KTran 1I
Sun Oct 13, 2019 2:38 pm
Forum: DeBroglie Equation
Topic: When to use DeBroglie Equation
Replies: 16
Views: 98

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.
by KTran 1I
Sun Oct 13, 2019 2:27 pm
Forum: Properties of Electrons
Topic: Balmer and Lyman Series
Replies: 3
Views: 28

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...
by KTran 1I
Mon Oct 07, 2019 12:05 am
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 127
Views: 74885

Re: Reading the textbook [ENDORSED]

Are there a lot of topics in the book that are not covered during lecture that show up on tests?
by KTran 1I
Mon Oct 07, 2019 12:03 am
Forum: SI Units, Unit Conversions
Topic: Test 1
Replies: 9
Views: 112

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.
by KTran 1I
Sun Oct 06, 2019 11:58 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 958

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?
by KTran 1I
Sun Oct 06, 2019 11:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Specific type of calculator for tests?
Replies: 6
Views: 50

Re: Specific type of calculator for tests?

Does anyone know if there is a resource to find an approved list of calculators?
by KTran 1I
Sun Oct 06, 2019 11:53 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 66
Views: 848

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?

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