Search found 29 matches
- Thu Jun 14, 2018 8:04 am
- Forum: General Science Questions
- Topic: Bond angles
- Replies: 4
- Views: 851
Re: Bond angles
Something I used to help memorize is once you get the basic shapes down (ones without lone pairs), once you get to the shapes with lone pairs, the bond angles are similar but for exmaple A trigonal planar is AX3 and an angular shaped molecule is AX2E. Both have three regions of electron density. Tr...
- Thu Jun 14, 2018 8:03 am
- Forum: Hybridization
- Topic: How to figure out hybridization
- Replies: 5
- Views: 1241
Re: How to figure out hybridization
when we look at so2 we know that it has three things attached (when you include the lone pair) to the central atom, S. this means that we are going to fill up three regions, starting with the s-orbital and moving onto the p orbital. We'll get sp2 for the hybridization. When we look at the VSEPR form...
- Mon Jun 11, 2018 9:28 pm
- Forum: Resonance Structures
- Topic: How to tell when an molecule is resonant?
- Replies: 7
- Views: 1718
Re: How to tell when an molecule is resonant?
Yitzchak Jacobson 1F wrote:you can tell when a molecule is resonant by knowing if there are multiple ways to draw the lewis structure.
Hope this helps you :)
does this simply mean changing around where elements are places on the central atom or which types of bonds are there?
- Mon Jun 11, 2018 9:26 pm
- Forum: General Science Questions
- Topic: Sig Figs
- Replies: 9
- Views: 1759
Re: Sig Figs
throughout the problem, how many sig figs should we use when plugging things into our calculator? I've gotten different answers on some problems by rounding things that I plug in
- Mon Jun 11, 2018 9:23 pm
- Forum: General Science Questions
- Topic: ionization energy versus electron affinity
- Replies: 1
- Views: 332
ionization energy versus electron affinity
I know that these have the same periodic trends, but what exactly is the difference between the two? Also, what type of questions besides conceptual ones would be asked regarding them?
- Mon Jun 11, 2018 9:20 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Charge of ligands
- Replies: 5
- Views: 729
Re: Charge of ligands
will we lose credit by just having them memorized and not writing out how we came to the answer?Sarai Ventura 1L wrote:Yes I think it would be helpful to know the charges to save time and I think you should know the common ones.
- Mon Jun 11, 2018 9:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Review Sessions Finals Week - Hedrick Hall? [ENDORSED]
- Replies: 6
- Views: 1048
Re: Review Sessions Finals Week - Hedrick Hall? [ENDORSED]
I couldn't find them either. I'm not sure if I was in the correct location. Luckily, there are many sessions tomorrow as well as Wednesday.
- Mon Jun 11, 2018 9:14 pm
- Forum: General Science Questions
- Topic: Bond angles
- Replies: 4
- Views: 851
Bond angles
Should we memorize bond angles for different structures? If so, which are the most important to memorize?
- Sun Jun 03, 2018 11:00 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Naming shape
- Replies: 7
- Views: 911
Re: Naming shape
You have to take the lone pairs into consideration as well. As mentioned previously, you should memorize the AXE formula. The E in this formula represents the lone pairs. It can change the shape of the molecule a lot.
- Sat Jun 02, 2018 11:03 pm
- Forum: Sigma & Pi Bonds
- Topic: What is a localized and delocalized Bond?
- Replies: 5
- Views: 32662
Re: What is a localized and delocalized Bond?
To simplify it, localized bonds are bonds formed by two overlapping molecular orbitals
- Sat Jun 02, 2018 11:00 pm
- Forum: Sigma & Pi Bonds
- Topic: Relationship between Sigma and Pi bondss
- Replies: 2
- Views: 627
Re: Relationship between Sigma and Pi bondss
I believe there can only be one sigma bond in both double and triple bonds.
- Sat May 26, 2018 9:57 pm
- Forum: Octet Exceptions
- Topic: Octet exceptions and Formal charges.
- Replies: 6
- Views: 969
Re: Octet exceptions and Formal charges.
Elements that do not follow the octet rule is one of the biggest reason why we use the formal charge equations. Because these elements do not follow the typical trends that others do, this formula provides an accurate charge to use when trying to make a stable, or the most stable form of a lewis str...
- Sat May 26, 2018 9:52 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge purpose
- Replies: 40
- Views: 7220
Re: Formal charge purpose
As Professor Lavelle has explained, you want to have the lewis structure in the most stable form. It's important to know what each individual elements charge is because it determines where the element should be placed in the structure.
- Sat May 26, 2018 9:34 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: formal charge
- Replies: 11
- Views: 1674
Re: formal charge
Finding the formal charge is super simple, even though the formula may look complicated. The formula is FC=V-(L+B/2) You take the lewis structure for the problem you are doing and look at the specific element that you're solving for, plug in the number of valence electrons that it should have based ...
- Sun May 13, 2018 5:53 pm
- Forum: Balancing Chemical Reactions
- Topic: Whole numbers
- Replies: 7
- Views: 920
Re: Whole numbers
Subscripts must always be whole numbers. The ratio of moles in the equation but it will never be lower than the empirical formula and the amount of moles seen there.
- Sun May 13, 2018 5:51 pm
- Forum: Balancing Chemical Reactions
- Topic: Suggestions for Balancing Reactions
- Replies: 8
- Views: 1008
Re: Suggestions for Balancing Reactions
A trick I tend to do somewhere on the side of my paper for extra help is creating a t-chart & tallying the amount of moles of each element I have for each side. It's a nice, visual way to make sure you're balanced!
- Sun May 13, 2018 5:48 pm
- Forum: Limiting Reactant Calculations
- Topic: Test 1
- Replies: 4
- Views: 663
Re: Test 1
No but you can go to your office hours to review your own personal tests! Highly recommend
- Sun May 13, 2018 5:46 pm
- Forum: Limiting Reactant Calculations
- Topic: Mass of Reactant/Product
- Replies: 4
- Views: 925
Re: Mass of Reactant/Product
No, reactants Never weigh more than the mass of the products because of conservation of mass.
- Sun Apr 29, 2018 5:12 pm
- Forum: Student Social/Study Group
- Topic: Chemistry News
- Replies: 135
- Views: 170046
Re: Chemistry News
Primeval Salt Shakes Up Ideas on How the Atmosphere Got Its Oxygen:
https://www.scientificamerican.com/arti ... ts-oxygen/
https://www.scientificamerican.com/arti ... ts-oxygen/
- Sun Apr 29, 2018 5:04 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: What does electron spin actually mean? [ENDORSED]
- Replies: 9
- Views: 3422
Re: What does electron spin actually mean? [ENDORSED]
Electron spin is the way that the electron spins within the magnetic field.
- Sun Apr 29, 2018 5:03 pm
- Forum: Student Social/Study Group
- Topic: Rieber Vista(Or any of the Riebers') Chem 14A Study Group Fall 2017
- Replies: 6
- Views: 1137
Re: Rieber Vista(Or any of the Riebers') Chem 14A Study Group Fall 2017
Is anyone interested in starting this for the 2018 Spring Quarter?
- Sun Apr 22, 2018 9:37 am
- Forum: Significant Figures
- Topic: Sig Fig Accuracy [ENDORSED]
- Replies: 6
- Views: 949
Re: Sig Fig Accuracy [ENDORSED]
Are sig figs going to need to be accurate on test #2?
- Sun Apr 22, 2018 9:36 am
- Forum: Student Social/Study Group
- Topic: Study Group
- Replies: 10
- Views: 1636
Re: Study Group
I'm definitely interested in this! If anyone else would like to have more study groups as well let me know! Possibly even on the weekends.
- Sun Apr 22, 2018 9:32 am
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 445094
Re: Rusty on High School Chem [ENDORSED]
Khan academy as well as youtube videos called "chemistry crash course" by one of the Green brothers. He goes over fundamentals as well as more complex ideas in chemistry as well as other subjects.
- Sun Apr 15, 2018 10:51 am
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 152578
Re: Reading the textbook
How useful is studying from the textbook in regards to test taking? Are tutoring/lecture notes better to study from?
- Sun Apr 15, 2018 10:49 am
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 274432
Re: Tutoring? [ENDORSED]
Are there any other tutoring programs similar to AAP?
- Sun Apr 15, 2018 10:44 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3705839
Re: Post All Chemistry Jokes Here
Two chemists go into a bar. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" — and he died.
- Fri Apr 13, 2018 12:01 pm
- Forum: Limiting Reactant Calculations
- Topic: Two limiting reactants?
- Replies: 10
- Views: 2501
Re: Two limiting reactants?
No, because if there were multiple limiting reactants, there would be no excess products.
- Thu Apr 12, 2018 11:57 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Molar Mass
- Replies: 9
- Views: 1104
Re: Molar Mass
Atomic mass is the mass of an individual atom but molar mass is the mass of one mole of an atom.