Hey, how much do we need to know about polyprotics for the final? There are no assigned homework questions for the section so I don't have a good gauge of what we should know.
Thanks!!
Search found 34 matches
- Sat Dec 08, 2018 8:41 pm
- Forum: Polyprotic Acids & Bases
- Topic: Polyprotics on Final
- Replies: 3
- Views: 634
- Sat Dec 08, 2018 8:37 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid Rain Formation
- Replies: 6
- Views: 841
Acid Rain Formation
Hi, can someone re-explain acid rain formation for me? My notes on this aren't very helpful or clear.
Thanks!!
Thanks!!
- Sat Dec 08, 2018 8:36 pm
- Forum: Biological Examples
- Topic: Vitamin B-12
- Replies: 2
- Views: 463
Vitamin B-12
I found somewhere (I think on the syllabus) that we needed to know about Vitamin B-12 but I can't find too much on it in my notes. Can someone explain it to me?
Thanks so much!
Thanks so much!
- Sun Dec 02, 2018 11:29 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 2
- Views: 320
Polydentate
How would you know if a compound is polydentate by just looking at the formula? Would you have to draw it out?
- Sun Dec 02, 2018 11:24 pm
- Forum: Naming
- Topic: Metal Suffix
- Replies: 2
- Views: 489
Metal Suffix
Can someone remind me again, when is the suffix -ate added to metals?
Thanks!
Thanks!
- Sun Dec 02, 2018 5:33 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted v. Lewis v. Arrhenius
- Replies: 4
- Views: 684
Bronsted v. Lewis v. Arrhenius
Hi, I'm still having trouble differentiating between the different definitions, and what they mean for the entities defined by acids and bases for each definition. Any explanation or examples you could give would help!
Thanks!
Thanks!
- Tue Nov 27, 2018 9:47 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: ion-ion bond vs. H-bond
- Replies: 4
- Views: 760
Re: ion-ion bond vs. H-bond
An ion-ion bond would be an ionic bond, which is the strongest type of bond. This is because it is based on the transfer of electrons, whereas an H bond is more like an electrostatic attraction between a proton and lone pair. This is also evidenced by the high melting/boiling points of ionic substan...
- Mon Nov 26, 2018 2:48 pm
- Forum: Sigma & Pi Bonds
- Topic: Pi Strength
- Replies: 4
- Views: 443
Re: Pi Strength
wait friend I think a sigma bond is stronger not weaker bc they overlap more directly. But going by that logic that does answer my question bc then the pi bond would break first (since it's weaker). I didn't even consider the relative strengths so thank you for bringing it up!
- Mon Nov 26, 2018 2:28 pm
- Forum: Sigma & Pi Bonds
- Topic: Pi Strength
- Replies: 4
- Views: 443
Pi Strength
Hi, Prof. Lavelle stressed the fact that Pi bonds prevent rotation from happening, and if the atoms rotate the bond breaks. Does this mean that a pi bond would normally break before a sigma bond if energy is applied to a molecule?
Thanks!
Thanks!
- Mon Nov 26, 2018 2:27 pm
- Forum: Hybridization
- Topic: Just Kind of Confused
- Replies: 13
- Views: 1058
Re: Just Kind of Confused
The only reason for moving the d orbital in front is to clarify that it is a lower energy orbital than the s and p orbitals, but I've seen it notated both ways.
- Mon Nov 26, 2018 2:25 pm
- Forum: General Science Questions
- Topic: Redox Reactions
- Replies: 1
- Views: 246
Redox Reactions
Does anyone know if there will be a chapter that specifically covers redox reactions or will they just be integrated into the course naturally? Just trying to figure out how much I need to brush up on.
- Mon Nov 26, 2018 2:21 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Hydrates
- Replies: 1
- Views: 243
Hydrates
Hi, Prof. Lavelle mentioned a hydrate in class today, how much do we have to know about hydrates? How familiar should we be with them in general?
Thanks!!
Thanks!!
- Mon Nov 26, 2018 2:18 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation Numbers
- Replies: 1
- Views: 518
Oxidation Numbers
Can someone explain how an oxidation number is calculated, and how it differs from a formal charge? In what situation would one be used over the other?
Thanks!
Thanks!
- Sun Nov 18, 2018 1:23 pm
- Forum: Coordinate Covalent Bonds
- Topic: Shape of the Molecule Contributes to Strength of Interaction
- Replies: 2
- Views: 571
Re: Shape of the Molecule Contributes to Strength of Interaction
Yeah just to add on a little more, molecular formula only gives the ratio of elements in a compound. Without the full name of the compound you really wouldn't know the shape/configuration at all.
- Sun Nov 18, 2018 1:16 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Homework Question: 3F.13
- Replies: 1
- Views: 302
Homework Question: 3F.13
Hi, I was just confused about question 3F.13. It shows a bunch of molecules and you're supposed to tell which one has the strongest intermolecular attractions and why. How are we supposed to determine this from the picture? I'm not really sure how to approach the problem at all.
Thanks!
Thanks!
- Sat Nov 17, 2018 9:13 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 300
Hybridization
I read the book section on Hybridization but I'm still a little confused. What is hybridization and how is it determined? Also, for the regions of electron density around an atom, is the hybridization all the same?
Thanks!
Thanks!
- Sat Nov 10, 2018 10:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Definitions: Molecular v. Electron Pair Geometry [ENDORSED]
- Replies: 1
- Views: 405
Definitions: Molecular v. Electron Pair Geometry [ENDORSED]
What's the difference between molecular geometry and electron pair geometry?
- Sat Nov 10, 2018 10:05 pm
- Forum: Dipole Moments
- Topic: Dipole Moments [ENDORSED]
- Replies: 10
- Views: 1012
Dipole Moments [ENDORSED]
Does anyone know if we would ever have to calculate anything like a dipole moment? It might have been said in class but I just can't remember at all.
Thanks so much!
Thanks so much!
- Sat Nov 10, 2018 10:04 pm
- Forum: Hybridization
- Topic: How to Determine
- Replies: 12
- Views: 1166
How to Determine
Could someone explain what causes hybridization? I think I'm just a little confused overall.
Thanks!!
Thanks!!
- Fri Nov 02, 2018 9:27 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Exam 2 Question 2
- Replies: 1
- Views: 309
Exam 2 Question 2
The question was : the uncertainty in momentum (delta p) of a 0.0240 kg cricket ball, which is traveling at 150. km/hr, is 1*10^-6 times its momentum. Calculate its minimum delta x. I solved everything out but I think my scientific notation was off. I multiplied the given uncertainty by 150 km/hr, m...
- Fri Nov 02, 2018 9:16 pm
- Forum: Properties of Light
- Topic: Exam 2 Question 4A
- Replies: 6
- Views: 890
Exam 2 Question 4A
The question was : at the threshold voltage, light is emitted with energy equal to 3.61*10^-22kJ, what is the frequency of the photon? I used both of the light equations to convert the energy into the frequency, but I'm not entirely sure what I did wrong. I would be really thankful if I could see so...
- Fri Nov 02, 2018 9:10 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Exam 2 Question 1A
- Replies: 2
- Views: 410
Exam 2 Question 1A
Hi I need some help with the first question on the second exam. The question was :alveoli are tiny sacs in the lungs whose average diameter is 2*10^-4 m; if an oxygen molecule is trapped inside the sac find its uncertainty in velocity. I tried to find the mass of one atom by dividing one atom by avo...
- Fri Oct 26, 2018 10:17 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy and Electron Affinity
- Replies: 9
- Views: 1886
Ionization Energy and Electron Affinity
Can someone explain the difference between ionization energy and electron affinity?
- Fri Oct 26, 2018 10:15 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma v. Pi
- Replies: 6
- Views: 903
Sigma v. Pi
Can someone explain the difference between a sigma and pi bond?
Thanks!!
Thanks!!
- Fri Oct 26, 2018 10:14 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 5
- Views: 460
Resonance Structures
Hi, I just wanted to ask what causes resonance structures, and how to know if a molecule has one? Just wanted to know!!
Thanks!
Thanks!
- Fri Oct 19, 2018 1:32 pm
- Forum: Trends in The Periodic Table
- Topic: atomic orbitals
- Replies: 2
- Views: 283
Re: atomic orbitals
Yeah just to kind of second and simplify what was already said, atomic orbitals are basically the probability of finding an electron in a certain area (so they aren’t really orbitals the way they’re commonly drawn in books). They’re just kind of a cloud that describes where the electron is most like...
- Fri Oct 19, 2018 1:22 pm
- Forum: Properties of Light
- Topic: Equations
- Replies: 7
- Views: 558
Equations
Hi, I’m a little bit confused about the use of equations.
Which equations do we use for solving for particles, and which are for light? I need some help getting them straightened out in my head.
Thanks!
Which equations do we use for solving for particles, and which are for light? I need some help getting them straightened out in my head.
Thanks!
- Fri Oct 19, 2018 1:19 pm
- Forum: *Shrodinger Equation
- Topic: Shrodinger Equation on Test
- Replies: 5
- Views: 414
Shrodinger Equation on Test
Does anyone know really how much about the Shrodinger Equation we need to understand for the test? I get some of it but I just want to figure out how much time I should put into reviewing it.
Thanks!
Thanks!
- Thu Oct 11, 2018 10:13 pm
- Forum: Properties of Light
- Topic: Question 1B.7 7th Edition
- Replies: 2
- Views: 225
Question 1B.7 7th Edition
Hi, I'm not sure at all how to approach this question. The question is: "Sodium vapor lamps emit yellow light of wavelength 589 nm. How much energy is emitted by a) an excited sodium atom when it generates a photon (b) 5.00 mg of sodium atoms emitting light at this wavelength (c) 1.00 mol of so...
- Thu Oct 11, 2018 10:08 pm
- Forum: *Shrodinger Equation
- Topic: Shrodinger Equation Meaning
- Replies: 3
- Views: 297
Shrodinger Equation Meaning
Just to clarify, does the Shrodinger equation give the energy solutions for just one particle or all of them? Or am I wrong entirely about what the solution of the equation means?
- Thu Oct 11, 2018 10:04 pm
- Forum: Properties of Light
- Topic: Explaining answer for 1.3
- Replies: 4
- Views: 398
Re: Explaining answer for 1.3
To my knowledge, the change of the electric fields corresponds to the frequency directly, so it makes sense that they would go down together (because the wave itself is the electrical field, since it oscillates less frequently there is less overall change). I'm not entirely sure though!
- Wed Oct 03, 2018 12:06 pm
- Forum: Significant Figures
- Topic: Accepted range of answers
- Replies: 2
- Views: 261
Re: Accepted range of answers
Professor also said that as long as it doesn't contribute to over 5% error you should be fine, though I'm not sure how easily you'd be able to calculate that efficiently when it matters. But just as info!
- Wed Oct 03, 2018 12:00 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Mole Definition
- Replies: 5
- Views: 744
Re: Mole Definition
From what I heard in a different chemistry course that I've taken, it was chosen on purpose (like as a base? Because carbon-12 is the most common isotope of carbon, the base of life). This is related to the definition of an amu, where 1 amu = 1/12 the mass of a carbon-12 atom. 1 amu=1g/mol which mea...
- Wed Oct 03, 2018 11:44 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Question E 15
- Replies: 2
- Views: 168
Re: Question E 15
Yeah, that's all correct. As you have done, you subtract 2 times the molar mass of OH from the given molar mass, and then add the molar mass of sulfur to find the total molar mass it as a sulfide. Since the oxidation numbers check out (unknown metal is +2, sulfur is -2) you only need to use one sulf...