Search found 20 matches

by Brigita1D
Sun Dec 10, 2017 9:53 am
Forum: Amphoteric Compounds
Topic: Amphoteric [ENDORSED]
Replies: 4
Views: 468

Re: Amphoteric [ENDORSED]

The amphoteric compounds include
Ga2O3, SnO2, Sb2O5, BeO, Al2O3,PbO2
by Brigita1D
Sat Dec 09, 2017 9:31 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa and Ka
Replies: 3
Views: 313

Re: pKa and Ka

To further add to this discussion I found this chart to be very helpful in understanding how Ka and pKa are related.
Ka pKa
High. Low. =strong
Low High = weak

This chart also applies toward Kb and pKb values.
by Brigita1D
Sun Dec 03, 2017 8:47 pm
Forum: Amphoteric Compounds
Topic: Amphoteric vs amphiprotic
Replies: 3
Views: 241

Re: Amphoteric vs amphiprotic

Amphoteric compound-has qualities of both an acid and a base
Amphiprotic compound- can accept a proton or donate a proton
by Brigita1D
Sun Dec 03, 2017 8:28 pm
Forum: Lewis Acids & Bases
Topic: Will titrations be on test?
Replies: 2
Views: 203

Re: Will titrations be on test?

No. Professor Lavelle sent out an email earlier today saying that titrations will be covered in 14BL.
by Brigita1D
Sat Nov 25, 2017 10:49 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelates
Replies: 2
Views: 136

Re: Chelates

The ligand, for example, ethylenediamine is a chelating ligand. It has two possible sites of attachment from both N's. This structure forms the chelate ring of atoms with a metal ion attached.
by Brigita1D
Sun Nov 19, 2017 12:20 pm
Forum: Naming
Topic: (H2O) or (OH2)? [ENDORSED]
Replies: 3
Views: 239

(H2O) or (OH2)? [ENDORSED]

Hello,
I was wondering when to use (H2O) or (OH2)? In the hw, question 29 uses (OH2) to represent aqua, but question 31 part c uses (H2O) in the answer to represent aqua. Can someone please clarify?
Thank you
by Brigita1D
Sat Nov 18, 2017 9:42 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Methanol polarity
Replies: 2
Views: 205

Methanol polarity

Hello,
Can someone please explain to me why methanol, CH4O, is polar? Textbook problem 4.75 states that the molecule is polar but I am unsure why.
Thank you in advance.
by Brigita1D
Wed Nov 15, 2017 2:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radicals and electrons
Replies: 3
Views: 216

Re: Radicals and electrons

The best place to put the lone electron in a radical would be on the atom with the lower electronegativity. Atoms with high electronegativity usually fill their octets completely as they get closer to the top right corner of the periodic table.
by Brigita1D
Mon Nov 13, 2017 10:11 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Poloarizability
Replies: 2
Views: 220

Re: Poloarizability

To add to the above comments, large anions tend to have highly distorted electron clouds (highly polarizable) and small cations tend to cause large distortions of anion electron clouds (highly polarizing)
by Brigita1D
Mon Nov 13, 2017 9:46 am
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE notation [ENDORSED]
Replies: 3
Views: 343

Re: AXE notation [ENDORSED]

Knowing the AXE notations can help identify molecular shapes of structures because molecules with the same formulas usually have the same shapes.
by Brigita1D
Thu Nov 02, 2017 2:16 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Wanted Formal Charge
Replies: 2
Views: 398

Re: Wanted Formal Charge

We have to find the formal charge of each element in a molecule because we want to verify that all the formal charges we get are equal to the oxidation number of the molecule. For example:
BrO^-
O FC = 6-(6+2/2) = -1
Br FC = 7-(6+2/2) = 0

The total result = -1 and that is the charge of this molecule
by Brigita1D
Thu Nov 02, 2017 1:25 pm
Forum: Octet Exceptions
Topic: Octets
Replies: 8
Views: 481

Re: Octets

What is a resonance hybrid? A resonance hybrid is a "blend of structures"(textbook page 81). When we write multiple Lewis structures for one molecule, we are implying that the molecule is a mix of the structures and the electrons are varied throughout the molecule. The "sum" of ...
by Brigita1D
Thu Oct 26, 2017 1:15 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: f-block
Replies: 3
Views: 210

Re: f-block

Side note: Professor Lavelle reminded us in class the other day that we only have to worry about the s,p, and first row of the d block. Most f-block elements are rare and unstable.
by Brigita1D
Mon Oct 23, 2017 7:46 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: EC Order Clarification
Replies: 2
Views: 146

EC Order Clarification

Could someone please explain which answer is the proper way to write electron configurations? I thought for example antimony=[Kr] 5s2 4d10 5p3 The answer in the solution manual for #2.43 c is [Kr] 4d10 5s2 5p3 I was basing my answer off of this chart 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6...
by Brigita1D
Fri Oct 20, 2017 12:15 am
Forum: DeBroglie Equation
Topic: Conversions
Replies: 3
Views: 220

Re: Conversions

A helpful trick that I learned in high school to help with conversions is using this short abbreviated model.
K. H. D. B. D. C. M. -The sentence to help you remember could be "King Henry Doesn't Buy Dumb Cheap Mice"

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by Brigita1D
Thu Oct 19, 2017 11:41 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Post Module Q. 14
Replies: 3
Views: 263

Re: Post Module Q. 14

A really good explanation of this concept is shown in the video module for the uncertainty principle. The experiment with the baseball, detector, and light source is a good representation as to why the uncertainties of large objects are not noticeable. Based on the diagram, we know the momentum of t...
by Brigita1D
Fri Oct 13, 2017 12:59 am
Forum: Properties of Light
Topic: Question 1.9
Replies: 3
Views: 217

Question 1.9

I was wondering as to why microwave popcorn is assigned to the third row in the homework question chart? I thought that a microwave has a wavelength of 1mm according to Figure 1.9 in the textbook. The homework chart states the wavelength is 1m. Please clarify
Thank you
by Brigita1D
Fri Oct 13, 2017 12:28 am
Forum: Properties of Light
Topic: 1.3 homework [ENDORSED]
Replies: 11
Views: 501

Re: 1.3 homework [ENDORSED]

If the frequency goes down, then wavelength increases. This means that the gap between each wave gets bigger and the change in the electric field is not as rapid with the decrease in oscillation. This leads to a decrease in "the extent of the change in the electrical field."
by Brigita1D
Thu Oct 12, 2017 11:58 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelengths of Electromagnetic Radiation
Replies: 4
Views: 294

Re: Wavelengths of Electromagnetic Radiation

Should we be expected to memorize the range of wavelengths for each of the types of electromagnetic radiation? I think the most important wavelengths we have to memorize refer to the visible light region ranging from 700nm to 400nm. 700nm refers to red light which has a longer wavelength and lower ...
by Brigita1D
Thu Oct 12, 2017 11:32 pm
Forum: Properties of Electrons
Topic: Series
Replies: 6
Views: 433

Re: Series

Jasmine Botello 1L wrote:what are the n-levels associated with series that are listed above??



Balmer series=lines with nsubscript1=2.(nsubscript2=3,...)
Lyman series=lines with nsubscript1=1.(nsubscript2=2,...)

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