Search found 30 matches
- Sun Dec 09, 2018 6:59 am
- Forum: Biological Examples
- Topic: Biological importance on final?
- Replies: 1
- Views: 420
Re: Biological importance on final?
Yes, just the basics that were covered in lecture about hemoglobin and the transition metals that he mentioned in class (Cr, Co, etc;)
- Sat Dec 08, 2018 9:15 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Fundamentals J7
- Replies: 5
- Views: 680
Re: Fundamentals J7
^ I think this question is fair game to come up on the final
- Sun Dec 02, 2018 9:01 pm
- Forum: Naming
- Topic: Polyatomic ions
- Replies: 1
- Views: 233
Polyatomic ions
Are we supposed to memorize the charges of polyatomic ions such as ammonium, nitrate, etc;?
- Tue Nov 27, 2018 10:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 6th edition 4.5
- Replies: 2
- Views: 386
Re: 6th edition 4.5
From what you posted, I think that it's just asking for the name. We don't need to know exact bond angles that are less than the norm, so just saying less than 120 degrees is fine for HW.
- Tue Nov 27, 2018 10:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 3 material
- Replies: 3
- Views: 465
Re: Test 3 material
Lavelle posted this on the "Announcements" portion of his website Test 3 covers: End of Bonding from 3.12 (6 Ed.) and from 2D (7 Ed.); and all of Molecular Shape and Structure (see Syllabus and Outlines for details). And the respective outlines can be found further down his webpage. Stuff ...
- Mon Nov 26, 2018 11:50 pm
- Forum: Hybridization
- Topic: Homework 2F.1 Question
- Replies: 1
- Views: 287
Re: Homework 2F.1 Question
Hi, I think the difference lies in what you are describing. For this question, these are hybridized orbitals (which take the wave nature of electrons into account, as we cannot tell precise electron locations) and thus it would make sense to describe them in regards to their orientation "toward...
- Sat Nov 24, 2018 9:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HW Question 2E21 Part D
- Replies: 1
- Views: 185
HW Question 2E21 Part D
In this question, it asks for the bond angle of N2H4. The answer key says that it would be 107 degrees. I understand that it is a trigonal pyramidal and that it is supposed to be less than 109.5, but how was this exact value obtained?
- Sat Nov 24, 2018 8:05 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: HW Question 2E.19B
- Replies: 1
- Views: 230
HW Question 2E.19B
This question asks for the shapes & bond angle of (CH3)2Be. I'm a little confused about what to consider when talking about electron density. I know the answer key says tetrahedral, so that means 4 regions of electron density. Why aren't the bonds in the other (CH3) considered?
- Tue Nov 20, 2018 2:50 pm
- Forum: Ionic & Covalent Bonds
- Topic: Silver halides & solubility
- Replies: 2
- Views: 1097
Silver halides & solubility
I have in my notes that "increasing covalent character of silver halides makes them less soluble as the size of anion increases." Why is this so and how is it related to polarizability?
- Wed Nov 14, 2018 3:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing shape based off of lewis structure
- Replies: 4
- Views: 466
Re: Drawing shape based off of lewis structure
Awesome, thanks for the help.
- Wed Nov 14, 2018 3:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing shape based off of lewis structure
- Replies: 4
- Views: 466
Drawing shape based off of lewis structure
For question 2E.3 part b, the book incorporates the shape of the molecule into the lewis structure by drawing the wedges. And I understand that we are not expected to draw the 3D model, but are we supposed to know how to draw the wedges? And if so, how do we know which atoms are positioned in the fr...
- Wed Nov 14, 2018 3:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: helpful chart for molecular shape
- Replies: 3
- Views: 443
Re: helpful chart for molecular shape
Thanks! Super helpful.
- Thu Nov 08, 2018 10:26 am
- Forum: Ionic & Covalent Bonds
- Topic: Electron Distortion definition
- Replies: 2
- Views: 329
Electron Distortion definition
I'm a little confused on the definition for electron distortion. I know it occurs when electrons are less tightly help and is proportional to the polarizability of electrons, but I'm not so sure of its exact definition.
- Thu Nov 08, 2018 10:20 am
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds [ENDORSED]
- Replies: 2
- Views: 450
Re: Covalent Bonds [ENDORSED]
It might also be helpful to think of nonpolar covalent bonds occurring with diatomic molecules (ex: H-H) as the electronegativity would equal 0, while polar covalent bonds occur with two different nonmetal elements
- Thu Nov 08, 2018 10:13 am
- Forum: Dipole Moments
- Topic: Helpful Sum up Video on bonds, van der waals, dipole moments, etc.
- Replies: 1
- Views: 302
Re: Helpful Sum up Video on bonds, van der waals, dipole moments, etc.
Thanks! This was super informative and fun to watch (:
- Wed Oct 31, 2018 10:13 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity equation/definition
- Replies: 2
- Views: 412
Electron Affinity equation/definition
Can someone explain to me the equation of election affinity given in lecture?
X(g)+ e- -> X- (g)
Eea= E(X)(g) - E(X-)(g)
X(g)+ e- -> X- (g)
Eea= E(X)(g) - E(X-)(g)
- Wed Oct 31, 2018 10:10 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Key Words
- Replies: 4
- Views: 478
Re: Key Words
Quizlet may be a good place to look since past students might have published their own sets
- Wed Oct 31, 2018 9:43 am
- Forum: Coordinate Covalent Bonds
- Topic: bound atoms vs separate atoms
- Replies: 5
- Views: 776
bound atoms vs separate atoms
From lecture, Lavelle said that chemical bonds form because bound atoms have lower energy that separate atoms. Could someone explain to me why it's that way?
- Wed Oct 24, 2018 12:24 am
- Forum: Trends in The Periodic Table
- Topic: Energy and Effective Nuclear Charge
- Replies: 2
- Views: 191
Re: Energy and Effective Nuclear Charge
I have the same notes as above ^ s<p<d<f
- Wed Oct 24, 2018 12:12 am
- Forum: Properties of Light
- Topic: conceptual questions on the test 2?
- Replies: 3
- Views: 378
Re: conceptual questions on the test 2?
I don't think anyone knows for sure, but I think a good rule of thumb is to be really familiar with the basics of each topic and in turn, you can apply what you've learned to whatever questions may come up on the test
- Wed Oct 24, 2018 12:00 am
- Forum: Administrative Questions and Class Announcements
- Topic: Units within calculations
- Replies: 1
- Views: 244
Re: Units within calculations
Hi, I think we are supposed to put units for every step of our answer since it makes it clear to your TA and as well to yourself what units you are working with and how they cancel out to give you the units in your final answer.
- Wed Oct 17, 2018 10:22 pm
- Forum: Properties of Light
- Topic: Tip for frequency equation
- Replies: 4
- Views: 367
Re: Tip for frequency equation
Thanks for the tip (:
- Wed Oct 17, 2018 10:15 pm
- Forum: DeBroglie Equation
- Topic: Measurable wavelike properties?
- Replies: 2
- Views: 308
Measurable wavelike properties?
In lecture, we went over a couple of examples of applying De Broglie's equation. When we get the wavelength of an object, what do we use to compare the measurement to in order to say if it does or does not have measurable wavelike properties? I've heard that it was 10^-18, but I'm not sure why.
- Wed Oct 17, 2018 10:10 pm
- Forum: Properties of Light
- Topic: Friday 10/5 Lecture
- Replies: 7
- Views: 631
Re: Friday 10/5 Lecture
I believe so. Unit for velocity is m/s or m*s^-1
- Thu Oct 11, 2018 7:31 pm
- Forum: Photoelectric Effect
- Topic: Good youtube videos to help me better understand photoelectric effect? [ENDORSED]
- Replies: 3
- Views: 503
Good youtube videos to help me better understand photoelectric effect? [ENDORSED]
I was wondering if anyone knew of other video lectures to help me better understand this topic, I personally just find it helpful to hear the concepts presented in different ways.
Any help is appreciated!
Any help is appreciated!
- Thu Oct 11, 2018 7:20 pm
- Forum: Properties of Light
- Topic: HW 1.7 6th Edition Part B
- Replies: 2
- Views: 306
Re: HW 1.7 6th Edition Part B
Agreed, that's what I put as my answer as well
- Tue Oct 09, 2018 10:09 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: E.23
- Replies: 2
- Views: 623
E.23
I am not sure how to go about any parts of this problem, specifically how to relate the overall amount to the specific ion/atoms in moles. Any help would be appreciated!
- Tue Oct 02, 2018 4:47 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Would it be acceptable to use the term concentration (C) for molarity (M) of a solution?
- Replies: 3
- Views: 344
Re: Would it be acceptable to use the term concentration (C) for molarity (M) of a solution?
I agree with ^^ . Molarity is one of the many ways to express the concentration.
- Tue Oct 02, 2018 4:38 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Moles!
- Replies: 7
- Views: 664
Re: Moles!
Same here! I watched Tyler DeWitt's videos on moles and it really cleared it up for me
First video: https://www.youtube.com/watch?v=wI56mHUDJgQ
First video: https://www.youtube.com/watch?v=wI56mHUDJgQ
- Tue Oct 02, 2018 4:34 pm
- Forum: Limiting Reactant Calculations
- Topic: HW Question M.5
- Replies: 2
- Views: 176
HW Question M.5
How do we know that BrF3 is the excess reactant in this problem? I thought ClO2 was the excess reactant due to 12 moles of it vs. 5 moles of BrF3?