Search found 31 matches

by Allen Chen 1J
Sun Jun 10, 2018 4:19 pm
Forum: Octet Exceptions
Topic: expanded octet
Replies: 12
Views: 538

Re: expanded octet

Any elements with unfilled d orbitals can have expanded octet.
by Allen Chen 1J
Sun Jun 10, 2018 4:18 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures on the Final Exam
Replies: 5
Views: 237

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
by Allen Chen 1J
Sun Jun 10, 2018 4:16 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acids/Bases
Replies: 8
Views: 399

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
by Allen Chen 1J
Sat Jun 02, 2018 6:04 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 8
Views: 279

Ligands

WHy do ligands have to have atleast one lone pair?
by Allen Chen 1J
Sat Jun 02, 2018 6:01 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Tetrahedral and Square planar
Replies: 8
Views: 420

Re: Tetrahedral and Square planar

From my understanding, tetrahedral is 3D while square planar is only 2D
by Allen Chen 1J
Sat Jun 02, 2018 5:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination compounds
Replies: 2
Views: 112

Re: Coordination compounds

Thanks for the wonderful video! It was very helpful and informative and really explained what coordination compounds are.
by Allen Chen 1J
Fri May 25, 2018 2:13 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing power
Replies: 10
Views: 545

Polarizing power

How does whether it is a cation or anion affect polarizing power?
by Allen Chen 1J
Fri May 25, 2018 2:09 pm
Forum: Dipole Moments
Topic: Dipoles [ENDORSED]
Replies: 2
Views: 221

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)
by Allen Chen 1J
Fri May 25, 2018 2:06 pm
Forum: Electronegativity
Topic: Trends? [ENDORSED]
Replies: 10
Views: 593

Re: Trends? [ENDORSED]

So far, we've went over atomic radius, ionic radius, ionic energy and electron affinity.
by Allen Chen 1J
Fri May 25, 2018 2:04 pm
Forum: Ionic & Covalent Bonds
Topic: Formal charge?
Replies: 12
Views: 463

Re: Formal charge?

The formal charge is the # of valence electrons – # of lone pair electrons – (1/2)(# of bonded electrons
by Allen Chen 1J
Fri May 25, 2018 1:51 am
Forum: Ionic & Covalent Bonds
Topic: Polarization
Replies: 7
Views: 291

Re: Polarization

I believe, the larger a cation/anion is the more polarizable it is, and the less polarizing power it has
by Allen Chen 1J
Sat May 19, 2018 10:30 pm
Forum: Ionic & Covalent Bonds
Topic: Electron affinity [ENDORSED]
Replies: 6
Views: 209

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
by Allen Chen 1J
Sat May 19, 2018 10:27 pm
Forum: Ionic & Covalent Bonds
Topic: Bonds between 1.5 and 2 [ENDORSED]
Replies: 5
Views: 181

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
by Allen Chen 1J
Sat May 19, 2018 10:25 pm
Forum: Ionic & Covalent Bonds
Topic: Octet rule
Replies: 17
Views: 532

Re: Octet rule

The octet rule is the general rule where elements before the d orbital want 8 electrons
by Allen Chen 1J
Mon May 14, 2018 3:05 pm
Forum: Lewis Structures
Topic: in class example bf^3 [ENDORSED]
Replies: 2
Views: 111

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.
by Allen Chen 1J
Mon May 14, 2018 3:01 pm
Forum: Octet Exceptions
Topic: OCTET RULE [ENDORSED]
Replies: 10
Views: 356

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.
by Allen Chen 1J
Mon May 14, 2018 3:00 pm
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 5
Views: 204

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
by Allen Chen 1J
Thu May 03, 2018 4:39 pm
Forum: Quantum Numbers and The H-Atom
Topic: Clarification on Spin Quantum Number
Replies: 4
Views: 180

Re: Clarification on Spin Quantum Number

Only 2 electrons can fit in a single orbital, and they cannot both have the same spin
by Allen Chen 1J
Thu May 03, 2018 4:38 pm
Forum: Photoelectric Effect
Topic: Test 2 final question [ENDORSED]
Replies: 15
Views: 556

Re: Test 2 final question [ENDORSED]

Electrons and Photons have a 1-1 ratio so it would also be 1000
by Allen Chen 1J
Thu May 03, 2018 4:34 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 127
Views: 75083

Re: Reading the textbook [ENDORSED]

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
by Allen Chen 1J
Thu May 03, 2018 4:34 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 127
Views: 75083

Re: Reading the textbook [ENDORSED]

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.
by Allen Chen 1J
Thu May 03, 2018 4:32 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 127
Views: 75083

Re: Reading the textbook [ENDORSED]

I feel as though reading the textbook is not necessarily necessary, but I do find how it works through example problems helpful in particular.
by Allen Chen 1J
Sun Apr 22, 2018 9:59 pm
Forum: Photoelectric Effect
Topic: 1.25 part B
Replies: 2
Views: 114

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.
by Allen Chen 1J
Sun Apr 22, 2018 9:55 pm
Forum: Photoelectric Effect
Topic: Significance of intensity [ENDORSED]
Replies: 7
Views: 214

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.
by Allen Chen 1J
Sun Apr 22, 2018 9:52 pm
Forum: DeBroglie Equation
Topic: Wavelength and De Broglie Equation [ENDORSED]
Replies: 9
Views: 287

Re: Wavelength and De Broglie Equation [ENDORSED]

The De Broglie equation is just another way of calculating wavelength, but there are also other ways.
by Allen Chen 1J
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: 958

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
by Allen Chen 1J
Sun Apr 15, 2018 9:12 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity [ENDORSED]
Replies: 3
Views: 180

Molarity [ENDORSED]

Does a solution of .5 M have a greater amount of solvent than a solution of .6 M?
by Allen Chen 1J
Sun Apr 15, 2018 9:11 pm
Forum: Significant Figures
Topic: Rounding: when and where?
Replies: 10
Views: 471

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
by Allen Chen 1J
Sun Apr 08, 2018 8:14 pm
Forum: Molarity, Solutions, Dilutions
Topic: Variables
Replies: 5
Views: 190

Re: Variables

There are also many other variables such as T is temperature in kelvins
by Allen Chen 1J
Sun Apr 08, 2018 8:11 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy vs Precision
Replies: 23
Views: 772

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?
by Allen Chen 1J
Fri Apr 06, 2018 1:50 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant
Replies: 9
Views: 448

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 ...

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