Search found 33 matches
- Fri Dec 07, 2018 3:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21431
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
You are a chemistry saint. Thank you.
- Wed Dec 05, 2018 9:51 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: 6th edition problem J.15
- Replies: 1
- Views: 314
Re: 6th edition problem J.15
In each of the following salts, either the cation or the anion is a weak acid or a weak base. Write the chemical equation for the proton transfer reaction of this cation or anion with water: (a) NaC6H5O; (b) KClO; (c) C5H5NHCl; (d) NH4Br. Why are we supposed to ignore the Cl in C5H5NHCl but not in ...
- Wed Dec 05, 2018 9:49 pm
- Forum: Bronsted Acids & Bases
- Topic: H2So3
- Replies: 2
- Views: 544
Re: H2So3
Bronsted acids are actually characterized as donating protons, not accepting them, so in the case of H2SO4, the molecule would become deprotonated and lose one of its H atoms to become HSO4^(1-). This is a case in which an anion can act as an acid because HSO4^(1-) can donate another H+ to become S...
- Wed Dec 05, 2018 9:47 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: 6th edition problem J.15
- Replies: 1
- Views: 314
6th edition problem J.15
In each of the following salts, either the cation or the anion is a weak acid or a weak base. Write the chemical equation for the proton transfer reaction of this cation or anion with water: (a) NaC6H5O; (b) KClO; (c) C5H5NHCl; (d) NH4Br. Why are we supposed to ignore the Cl in C5H5NHCl but not in K...
- Wed Dec 05, 2018 8:56 pm
- Forum: Bronsted Acids & Bases
- Topic: H2So3
- Replies: 2
- Views: 544
H2So3
Why is H2SO3 considered a bronstead acid? I know bronstead acids are defined by their tendency to accept protons/Hydrogen ions, but how do we see that in H2SO4? Also same question for Ca(OH)2, how do we tell it's a bronstead base?
- Wed Dec 05, 2018 7:45 pm
- Forum: Naming
- Topic: Usage of prefix
- Replies: 2
- Views: 351
Re: Usage of prefix
monodentate : di-,tri-,tetra-, penta-, hexa-
polydentate: bis-, tris-, tetrakis-
polydentate: bis-, tris-, tetrakis-
- Wed Dec 05, 2018 7:41 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Ka and Kb on Final
- Replies: 9
- Views: 2818
Ka and Kb on Final
In class, Lavelle mentioned we would not need to know equilibrium constants until 14b, so what exactly do we need to know in regards to what we've learned about Ka and Kb?
- Sun Dec 02, 2018 2:18 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: polarizing power and polarizability
- Replies: 5
- Views: 698
Re: polarizing power and polarizability
Anions with a bigger atomic radius have a higher polarizability because electrons on the outer shell of big anions don't have a very strong pull towards the nucleus and are therefore easily taken Cations with a smaller atomic radius have higher polarizing power because the nucleus pull is very stron...
- Sun Dec 02, 2018 2:09 am
- Forum: Sigma & Pi Bonds
- Topic: Sigma/pi bond: orbitals
- Replies: 1
- Views: 2284
Re: Sigma/pi bond: orbitals
If i'm not mistaken, sigma bonds can be the overlap (or hybridization) of various bonds. For example s&s or s&p or even s&d. But pi bonds are the the overlapping of p&p exclusively
- Sun Dec 02, 2018 1:14 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Model
- Replies: 5
- Views: 576
VSEPR Model
Just for clarifiction, when we're asked to use "the VSEPR Model" what does that refer to? Drawing the VSEPR structure? Or determining the AXE formula? Or other?
- Tue Nov 27, 2018 12:49 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Dipole Moments
- Replies: 1
- Views: 301
Dipole Moments
How do we know when a compound has a dipole moment? Do they all have one?
- Sun Nov 25, 2018 2:38 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 12
- Views: 1720
Final
I know the final is cumulative but does anybody know if it is more focused on topics we have not yet been tested on?
- Sun Nov 25, 2018 9:27 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Pi Bonds
- Replies: 1
- Views: 316
Pi Bonds
Why exactly do pi bonds break when they're rotated?
- Sun Nov 18, 2018 10:57 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 16
- Views: 1228
Re: Bond Angles
For this, is there a way to calculate or memorize bond angles when there is a lone pair? It is usually slightly different than the angles of the normal structure. Is there a set degree amount that a lone pair shifts a bond? There's no set amount of change I believe. I just know that the more lone p...
- Sun Nov 18, 2018 10:51 am
- Forum: Administrative Questions and Class Announcements
- Topic: Review for Final
- Replies: 2
- Views: 412
Review for Final
Does anybody know when the Final review sessions begin? Will it be before or after the week 9 test is administered?
- Sun Nov 18, 2018 10:47 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing structures
- Replies: 8
- Views: 823
Re: Drawing structures
I'm pretty sure when we're using the wedges and dashed lines (vsepr structures) , we're only interested in showing electron density and the resulting shape and direction. So single bonds/double bonds/triple bonds are all treated as single bonds.
- Thu Nov 15, 2018 5:57 pm
- Forum: Hybridization
- Topic: Question 4.31 6th Edition
- Replies: 1
- Views: 296
Question 4.31 6th Edition
State the relative orientations of the following hybrid
orbitals: (a) sp3; (b) sp; (c) sp3d2; (d) sp2.
What is the question asking? Do I just state the number of possible orbitals?
orbitals: (a) sp3; (b) sp; (c) sp3d2; (d) sp2.
What is the question asking? Do I just state the number of possible orbitals?
- Sun Nov 11, 2018 3:11 am
- Forum: Dipole Moments
- Topic: Dipoles and Molarity
- Replies: 2
- Views: 433
Dipoles and Molarity
I don't understand exactly how dipoles and polarity are related, can somebody explain this?
- Sun Nov 11, 2018 3:08 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Angles of Shapes [ENDORSED]
- Replies: 4
- Views: 627
Angles of Shapes [ENDORSED]
For a shape like a tetrahedral or something more complicated, how do we know the angle, is that something that needs to memorized?
- Sun Nov 11, 2018 2:55 am
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 8
- Views: 925
Electronegativity
Is there certain exceptions to finding electronegativity, like there is when finding ionization energy according to the periodic table?
- Thu Nov 01, 2018 1:29 am
- Forum: *Shrodinger Equation
- Topic: Schrodinger's Equation
- Replies: 6
- Views: 1288
Re: Schrodinger's Equation
105085381 wrote:I know we have not needed to yet, but will we need to be able to apply Schrodinger's Equation on the midterm exam?
We won't need to use the equation in a calculation, but make sure you understand it's concept and purpose because anything is fair game for the midterm.
- Thu Nov 01, 2018 1:19 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Difference Between Atomic or Molecular Spectroscopy
- Replies: 2
- Views: 15524
Difference Between Atomic or Molecular Spectroscopy
The Quantum World outline says, "With respect to electron transitions that give rise to a UV or visible spectrum: understand the difference between electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molecular orbitals (molecular spectroscopy)." Wh...
- Wed Oct 31, 2018 1:15 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 6th Edition Problem 3.9
- Replies: 1
- Views: 290
6th Edition Problem 3.9
The question asks : Which M2+ ions (where M is a metal) are predicted to have the following ground-state electron configurations: (a) [Ar]3d7; (b) [Ar]3d6; (c) [Kr]4d4; (d) [Kr]4d3? I'm not sure how to go about this question, especially with the d-state exceptions. Can someone show how they solved a...
- Sun Oct 28, 2018 9:08 pm
- Forum: Student Social/Study Group
- Topic: study group at Hedrick Hall
- Replies: 4
- Views: 535
Re: study group at Hedrick Hall
^^Also very down
- Sat Oct 27, 2018 5:08 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Calculating Velocity
- Replies: 4
- Views: 571
Calculating Velocity
Is there any type of indicator that you may have not converted right or messed up somewhere in the equation when calculating velocity? For example should you ever get like 3.4 x 10 ^ -12 m/s as your velocity? Is it possible to be that small?
- Sat Oct 27, 2018 5:01 pm
- Forum: DeBroglie Equation
- Topic: Kg vs Grams
- Replies: 6
- Views: 687
Kg vs Grams
Is there a reason we use kg in DeBroglie's equation? And in what other equations do we use kg as opposed to grams?
- Mon Oct 22, 2018 8:47 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Question 1.15 6th Edition
- Replies: 1
- Views: 180
Question 1.15 6th Edition
Question: In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.
How do we know that n1 is equal to 1?
How do we know that n1 is equal to 1?
- Sun Oct 14, 2018 12:50 pm
- Forum: Student Social/Study Group
- Topic: Study Groups?
- Replies: 1
- Views: 196
Study Groups?
I was wondering if anybody has a study group I could join or is interested in starting one? Let me know
- Sun Oct 14, 2018 12:44 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Figs
- Replies: 8
- Views: 981
Sig Figs
In a question that does not give sig figs, do we just make our own?
- Sun Oct 14, 2018 12:42 pm
- Forum: SI Units, Unit Conversions
- Topic: Kiloelectron volt to Joule
- Replies: 5
- Views: 1000
Re: Kiloelectron volt to Joule
1 electron volt is equal to 1.602 x 10^19 joule
- Fri Oct 05, 2018 12:51 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 418183
Re: Advice from a Medical Student [ENDORSED]
Thank you this is very reassuring and encouraging! Can you make a post about your process in applying for Med School sometime in the future?
- Fri Oct 05, 2018 12:45 am
- Forum: Administrative Questions and Class Announcements
- Topic: Registering/Creating Your Chemistry Community Account
- Replies: 40
- Views: 101079
Re: Registering/Creating Your Chemistry Community Account
How are points documented ? Do our TA's check at the end of each week?
- Wed Oct 03, 2018 10:51 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Mole Definition
- Replies: 5
- Views: 737
Mole Definition
Is there a reason a Mol is defined by 12 grams of carbon-12? What is the significance or is it coincidental?