Search found 31 matches
- Sun Jun 10, 2018 4:19 pm
- Forum: Octet Exceptions
- Topic: expanded octet
- Replies: 12
- Views: 2653
Re: expanded octet
Any elements with unfilled d orbitals can have expanded octet.
- Sun Jun 10, 2018 4:18 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures on the Final Exam
- Replies: 5
- Views: 619
Re: Drawing Lewis Structures on the Final Exam
The bond angles without lone pairs need to be accurate but as you add lone pair repulsion it becomes impossible to know exact angle so you can only say less than x degrees. I think
- Sun Jun 10, 2018 4:16 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Acids/Bases
- Replies: 8
- Views: 1179
Re: Conjugate Acids/Bases
I believe the conjugate acid and bases are on opposite sides of the reaction, as the conjugate acid becomes the conjugate base and vice versa
- Sat Jun 02, 2018 6:04 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 8
- Views: 1273
Ligands
WHy do ligands have to have atleast one lone pair?
- Sat Jun 02, 2018 6:01 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Tetrahedral and Square planar
- Replies: 8
- Views: 1408
Re: Tetrahedral and Square planar
From my understanding, tetrahedral is 3D while square planar is only 2D
- Sat Jun 02, 2018 5:54 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination compounds
- Replies: 2
- Views: 466
Re: Coordination compounds
Thanks for the wonderful video! It was very helpful and informative and really explained what coordination compounds are.
- Fri May 25, 2018 2:13 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing power
- Replies: 10
- Views: 8706
Polarizing power
How does whether it is a cation or anion affect polarizing power?
- Fri May 25, 2018 2:09 pm
- Forum: Dipole Moments
- Topic: Dipoles [ENDORSED]
- Replies: 2
- Views: 494
Dipoles [ENDORSED]
Since it is relative, Do all covalent bonds exhibit some degree of polar nature even if difference in electronegativity is below .4? And if so, do they have dipoles still(just negligible)
- Fri May 25, 2018 2:06 pm
- Forum: Electronegativity
- Topic: Trends? [ENDORSED]
- Replies: 10
- Views: 1597
Re: Trends? [ENDORSED]
So far, we've went over atomic radius, ionic radius, ionic energy and electron affinity.
- Fri May 25, 2018 2:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Formal charge?
- Replies: 12
- Views: 1381
Re: Formal charge?
The formal charge is the # of valence electrons – # of lone pair electrons – (1/2)(# of bonded electrons
- Fri May 25, 2018 1:51 am
- Forum: Ionic & Covalent Bonds
- Topic: Polarization
- Replies: 7
- Views: 1069
Re: Polarization
I believe, the larger a cation/anion is the more polarizable it is, and the less polarizing power it has
- Sat May 19, 2018 10:30 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electron affinity [ENDORSED]
- Replies: 6
- Views: 794
Re: Electron affinity [ENDORSED]
I think you're thinking of electron affinity bc it is actually how much an element wants an electron, so maybe that will clear things up
- Sat May 19, 2018 10:27 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bonds between 1.5 and 2 [ENDORSED]
- Replies: 5
- Views: 970
Re: Bonds between 1.5 and 2 [ENDORSED]
It is just a grey area where we are even more uncertain whether the bond has covalent or ionic character
- Sat May 19, 2018 10:25 pm
- Forum: Ionic & Covalent Bonds
- Topic: Octet rule
- Replies: 17
- Views: 2349
Re: Octet rule
The octet rule is the general rule where elements before the d orbital want 8 electrons
- Mon May 14, 2018 3:05 pm
- Forum: Lewis Structures
- Topic: in class example bf^3 [ENDORSED]
- Replies: 2
- Views: 469
Re: in class example bf^3 [ENDORSED]
Since Boron "wants" 3 electrons when doing formal charge, and you only count 1 from each bond, boron needs 3 bonds to be the most stable.
- Mon May 14, 2018 3:01 pm
- Forum: Octet Exceptions
- Topic: OCTET RULE [ENDORSED]
- Replies: 10
- Views: 1042
Re: OCTET RULE [ENDORSED]
The octet rule just refers to the atoms wanting 8 electrons in order to become stable, but there are many exceptions to this rule when you reach the d orbital, or the 3rd row.
- Mon May 14, 2018 3:00 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electronegativity
- Replies: 5
- Views: 712
Re: Electronegativity
I believe that since the 1.5 and 2 parameters are merely rough guidelines with uncertainty, then the region in between just has greater uncertainty
- Thu May 03, 2018 4:39 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Clarification on Spin Quantum Number
- Replies: 4
- Views: 486
Re: Clarification on Spin Quantum Number
Only 2 electrons can fit in a single orbital, and they cannot both have the same spin
- Thu May 03, 2018 4:38 pm
- Forum: Photoelectric Effect
- Topic: Test 2 final question [ENDORSED]
- Replies: 15
- Views: 1807
Re: Test 2 final question [ENDORSED]
Electrons and Photons have a 1-1 ratio so it would also be 1000
- Thu May 03, 2018 4:34 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 146781
Re: Reading the textbook
Taizha 1C wrote:Has anyone found any other resources outside of class that is useful for preparing for the test? Like any practice exam/test problems?
Looking at the tests from fall quarter as extra practice can be really useful
- Thu May 03, 2018 4:34 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 146781
Re: Reading the textbook
yazminedesan1F wrote:Jocelyn1B wrote:How do you balance your other classes while still studying for chemistry?
I try to go to the peer review sessions before each test.
- Thu May 03, 2018 4:32 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 146781
Re: Reading the textbook
I feel as though reading the textbook is not necessarily necessary, but I do find how it works through example problems helpful in particular.
- Sun Apr 22, 2018 9:59 pm
- Forum: Photoelectric Effect
- Topic: 1.25 part B
- Replies: 2
- Views: 316
Re: 1.25 part B
Yes, compared to part a, part b is just a few extra steps in the beginning; you just need to convert the mg to mols, then to atoms.
- Sun Apr 22, 2018 9:55 pm
- Forum: Photoelectric Effect
- Topic: Significance of intensity [ENDORSED]
- Replies: 7
- Views: 742
Re: Significance of intensity [ENDORSED]
When the energy of the photon is equal or greater than the threshold energy, then an electron can be ejected. By increasing intensity, you are increasing photons, so if and only if we can meet the threshold energy can increasing intensity result in more electrons being ejected.
- Sun Apr 22, 2018 9:52 pm
- Forum: DeBroglie Equation
- Topic: Wavelength and De Broglie Equation [ENDORSED]
- Replies: 9
- Views: 965
Re: Wavelength and De Broglie Equation [ENDORSED]
The De Broglie equation is just another way of calculating wavelength, but there are also other ways.
- Sun Apr 15, 2018 9:15 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Which mass of oxygen should be used? [ENDORSED]
- Replies: 23
- Views: 3193
Re: Which mass of oxygen should be used? [ENDORSED]
Since the more exact value is 15.9994, 16.00 is actually closer to it than 15.99
- Sun Apr 15, 2018 9:12 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Molarity [ENDORSED]
- Replies: 3
- Views: 499
Molarity [ENDORSED]
Does a solution of .5 M have a greater amount of solvent than a solution of .6 M?
- Sun Apr 15, 2018 9:11 pm
- Forum: Significant Figures
- Topic: Rounding: when and where?
- Replies: 10
- Views: 837
Re: Rounding: when and where?
If that was the exact value, then rounding up wouldn't be considered wrong since 7 is above or equal to 5 and therefore is rounded up
- Sun Apr 08, 2018 8:14 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Variables
- Replies: 5
- Views: 505
Re: Variables
There are also many other variables such as T is temperature in kelvins
- Sun Apr 08, 2018 8:11 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy vs Precision
- Replies: 23
- Views: 2591
Re: Accuracy vs Precision
Chem_Mod wrote:Accuracy is on target. Precision is how closely you can repeatedly measure a thing.
What is the chemistry context in which these differences will be most important?
- Fri Apr 06, 2018 1:50 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant
- Replies: 9
- Views: 2969
Re: Limiting Reactant
Could someone explain in more detail the "comparing" part of these steps? I do not understand what you do after you have the two different ratios, how do you compare them to know which is your limiting reagent? Here is an example: 2Na+Cl2 = 2NaCl. If 8 g of Na reacts with 8 g of Cl2: you ...