Search found 71 matches
- Fri Mar 13, 2020 10:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 382650
Re: Advice from a Medical Student [ENDORSED]
Thank you so much!!
- Fri Mar 13, 2020 10:21 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 334094
Re: Final Jitters
So I know that the format for the final has changed so it's a lot easier, but this topic is still super helpful to me. Thank you to everyone who posted here!
- Fri Mar 13, 2020 10:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Excellence in Chemistry Award!
- Replies: 27
- Views: 9819
Re: Excellence in Chemistry Award!
Congratulations!!!
- Fri Mar 13, 2020 10:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 244971
Re: Advice from a Medical Student - Part II [ENDORSED]
Thank you so much, and best wishes to you!
- Fri Mar 13, 2020 10:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Homework 5G.1 Help
- Replies: 4
- Views: 329
Re: Homework 5G.1 Help
Thank you!
- Fri Mar 13, 2020 10:16 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 4E.5, 4E.7
- Replies: 7
- Views: 569
Re: 4E.5, 4E.7
Thank you!
- Fri Mar 13, 2020 10:15 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: ∆U When ∆T = 0
- Replies: 5
- Views: 354
Re: ∆U When ∆T = 0
Thank you!
- Fri Mar 13, 2020 10:14 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Example 4I.3
- Replies: 3
- Views: 310
Re: Example 4I.3
Entropy is a state function, so the change in entropy of the system is the same regardless of whether the path is reversible or irreversible. I agree with the peer above's explanation. In addition, the initial & final states are the same because the process is isothermal, so, according to ΔS = ...
- Sat Feb 29, 2020 1:59 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Equation for Standard Cell Potential
- Replies: 2
- Views: 272
Re: Equation for Standard Cell Potential
Standard potentials are given as reductions, not oxidations. Therefore, in the reduction of Fe2+, Fe2+ would be the reactant and Fe would be the product. In the given reaction, Fe2+ is being oxidized, which is why it's flipped and Fe2+ is the product rather than the reactant. But the standard poten...
- Wed Feb 26, 2020 11:57 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Equation for Standard Cell Potential
- Replies: 2
- Views: 272
Equation for Standard Cell Potential
In the textbook, the standard cell potential of this reaction
Fe(s) + 2Ag⁺(aq) → Fe²⁺(aq) + 2Ag(s)
is
E˚cell=E˚(Ag+/Ag)-E˚(Fe2+/Fe)
Why is it product/reactant for Fe, and reactant/product for Ag?
Thanks!
Fe(s) + 2Ag⁺(aq) → Fe²⁺(aq) + 2Ag(s)
is
E˚cell=E˚(Ag+/Ag)-E˚(Fe2+/Fe)
Why is it product/reactant for Fe, and reactant/product for Ag?
Thanks!
- Wed Feb 12, 2020 4:26 pm
- Forum: Phase Changes & Related Calculations
- Topic: 4.5
- Replies: 2
- Views: 240
Re: 4.5
Find the amount of heat transferred to ice in 0.5hrs using q=mCdeltaT. You will get 3135J transferred in 0.5 hrs. Then use dimensional analysis to find how many joules are transferred in 10hrs. You get 62.7kJ transferred in 10hrs. Then divide 62.7kJ by 8.33 moles and get 7.53kJ/mol for enthalpy of ...
- Wed Feb 12, 2020 8:59 am
- Forum: Phase Changes & Related Calculations
- Topic: 4.5
- Replies: 2
- Views: 240
4.5
In 1750, Joseph Black performed an experiment that eventually led to the discovery of enthalpies of fusion. He placed two samples of water, each of mass 150. g, at 0.00 8C (one ice and one liquid) in a room kept at a constant temperature of 5.00 8C. He then observed how long it took for each sample ...
- Tue Feb 11, 2020 4:28 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Example 4I.3
- Replies: 3
- Views: 310
Example 4I.3
Q: Calculate ΔS, ΔS surr , and ΔS tot for a) isothermal, reversible expansion and b) isothermal, free expansion of 1.00 mol of ideal gas molecules from 8.00 L to 20.00 L at 292 K. a) isothermal & reversible expansion: ΔS = +7.6 J/K ΔS surr = -7.6 J/K ΔS tot = 0 b) isothermal, free expansion (and...
- Wed Feb 05, 2020 1:24 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: ∆U When ∆T = 0
- Replies: 5
- Views: 354
∆U When ∆T = 0
Why is ∆U = 0 when ∆T = 0? Thanks!
- Fri Jan 31, 2020 10:52 am
- Forum: Calculating Work of Expansion
- Topic: 4A.3
- Replies: 8
- Views: 395
Re: 4A.3
I did this problem yet I keep getting my final answer as 28.6, which would round up to 29. The answer says it' supposed to be 28. Has anyone else been getting the same thing? I got that too, but when I used 2.8*10 -4 instead of 2.8274*10 -4 , I got 28.371, which rounds down to 28. Are we supposed t...
- Fri Jan 31, 2020 10:37 am
- Forum: Calculating Work of Expansion
- Topic: 4A.3
- Replies: 8
- Views: 395
Re: 4A.3
You do use w = P * A * D! w = 2 atm * (0.015 m) 2 * 0.2 m * pi w = 2.8274 * 10 -4 m 3 * atm Then, you can multiply the answer by 101,325 Pa to convert from atm to Pa. Once you have your answer in m 3 * Pa, it is equal to that amount in joules (J). Where did you get 0.015m from and pi from? I believ...
- Tue Jan 28, 2020 10:17 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 4E.5, 4E.7
- Replies: 7
- Views: 569
4E.5, 4E.7
I'm getting almost all of the answers wrong for these two questions and I'm not sure why. Any help is appreciated, thanks! 4E.5 a) 3C 2 H 2 (g) --> C 6 H 6 (g) What I did: [3(837)] + [6(-348)] = 423 kJ.mol -1 Textbook answer: -587 kJ.mol -1 4E.7 a) N 2 (g) + 3F 2 (g) --> 2NF 3 (g) [944+(3*158)] + [6...
- Tue Jan 21, 2020 12:32 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6B. 3
- Replies: 2
- Views: 165
Re: 6B. 3
I have the solutions manual and can also confirm that it's correct!
- Mon Jan 20, 2020 11:43 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6A.23
- Replies: 3
- Views: 246
Re: 6A.23
You don't need K nor the ICE table because Ba(OH)2 is a strong base and thus will be 100% dissociated in water. This means you can assume the equilibrium concentration of the reaction will be: [Ba2+]final = [Ba(OH)2]initial = 0.025M and [OH-]final = 2*[Ba2+]final = 0.05M Remember that these conclus...
- Mon Jan 20, 2020 11:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6A.23
- Replies: 3
- Views: 246
6A.23
"6A.23 Calculate the molar concentration of Ba(OH)2(aq) and the molar concentrations of Ba21, OH2, and H3O1 in an aqueous solution that contains 0.43 g of Ba(OH)2 in 0.100 L of solution."
Are we supposed to use the ice box method to solve this? K wasn't given.
Thanks!
Are we supposed to use the ice box method to solve this? K wasn't given.
Thanks!
- Sun Jan 12, 2020 2:01 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Homework 5G.1 Help
- Replies: 4
- Views: 329
Homework 5G.1 Help
5G.1 asks to "State whether the following statements are true or false. If false, explain why." For Part D of the question, it says "If one starts with higher concentrations of reactants, the equilibrium concentrations of the products will be larger." Why is that marked as true w...
- Sun Dec 08, 2019 9:46 am
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 334094
Re: Final Jitters
Test anxiety is a big issue for me and I'd like to thank everyone who gave tips! Here are some of mine (sorry for any repeats): 1. Exercise! Or at least, get moving. I can get incredibly tense while studying, and working out helps relieve that. Keeping your body healthy in general is also helpful in...
- Sun Dec 08, 2019 9:37 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: Hydrogen
- Replies: 3
- Views: 325
Re: Hydrogen
If you mean hydrogen bonding, then it's where nitrogen, oxygen, and fluorine atoms with a lone pair are bonding sites (each lone pair is one bonding site). Hydrogen atoms attached to a nitrogen, oxygen, or fluorine are also bonding sites.
I hope this helps!
I hope this helps!
- Sun Dec 08, 2019 9:35 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: LDF
- Replies: 4
- Views: 448
Re: LDF
Yes, all molecules have LDF. Induced-dipole dipole occurs between a polar molecule and a non-polar molecule.
I hope this helps!
I hope this helps!
- Sun Dec 08, 2019 9:33 am
- Forum: Lewis Structures
- Topic: hydrogen bonding
- Replies: 3
- Views: 334
Re: hydrogen bonding
Nitrogen, oxygen, and fluorine atoms with a lone pair are bonding sites (each lone pair is one bonding site). Hydrogen atoms attached to a nitrogen, oxygen, or fluorine are also bonding sites.
I hope this helps!
I hope this helps!
- Sun Dec 08, 2019 9:32 am
- Forum: Dipole Moments
- Topic: test 2 #6
- Replies: 2
- Views: 293
Re: test 2 #6
Unless all the atoms are the same, tetrahedrals are always polar. CH2F2 looks flat on paper, but its 3D structure shows that it's not.
I hope this helps!
I hope this helps!
Re: Naming
You use those when the ligand already contains a prefix (for example, (en)), is a polydentate, or it starts with a vowel.
I hope this helps!
I hope this helps!
- Sun Dec 08, 2019 9:26 am
- Forum: Administrative Questions and Class Announcements
- Topic: Accidentally posting in wrong class
- Replies: 1
- Views: 199
Re: Accidentally posting in wrong class
It's probably simpler to delete the old post and repost it here.
- Sun Dec 08, 2019 9:26 am
- Forum: Administrative Questions and Class Announcements
- Topic: Chem comm troubleshooting
- Replies: 1
- Views: 147
Re: Chem comm troubleshooting
Not that I know of, but it might be better to not make posts back to back.
- Sun Dec 08, 2019 9:25 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: boiling point
- Replies: 9
- Views: 893
Re: boiling point
Substances with higher boiling points will have stronger intermolecular interactions. Conversely, substances with lower boiling points will have weaker intermolecular interactions.
I hope this helps!
I hope this helps!
- Sun Dec 08, 2019 9:24 am
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Comm access
- Replies: 1
- Views: 266
Re: Chem Comm access
I believe that you can still look at posts (since you don't have to login for that) but you can't reply or make your own unless you're going to have Dr. Lavelle for Chem 14B. In that case, you will be able to post.
- Sun Dec 08, 2019 9:21 am
- Forum: Naming
- Topic: Amine vs Ammine?
- Replies: 3
- Views: 5722
Re: Amine vs Ammine?
Are you talking about ammine for the neutral lignad: NH3 and about their spelling? If so, I was told in one of my plf's that the spelling matters in regards to points so when naming coordination compounds make sure you write ammine with double m's! There is a difference between an amine and an ammi...
- Sun Dec 08, 2019 9:20 am
- Forum: Naming
- Topic: Any Givens During the Final?
- Replies: 4
- Views: 489
Re: Any Givens During the Final?
Thank you both! I am pretty sure the only givens are those we have seen on the midterm and tests. You may be able to ask about abbreviations as long as they are not on the periodic table/have been explained in class. It would be best to memorize ion charges, but worst case you can calculate the form...
- Sun Dec 08, 2019 9:19 am
- Forum: Naming
- Topic: Polydentate Ligands
- Replies: 3
- Views: 236
Re: Polydentate Ligands
Thank you both!
- Sun Dec 08, 2019 9:18 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentates
- Replies: 9
- Views: 657
Re: Polydentates
A ligand is polydentate if when we draw the lewis structure there is more than one bonding site in the form of lone pairs present on separate atoms in the compound. Fro the textbook, the main ones we have to know are en which is bidentate, bien which is tridentate, oxalate which is bidentate, and e...
- Sun Dec 08, 2019 9:17 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 3
- Views: 315
Re: Polydentate
Polydentate ligands have more than one lone pair that it can donate. They are also usually in the structure of atom with a lone pair — space atom — space atom — atom with a lone pair.
- Sun Dec 08, 2019 9:07 am
- Forum: Sigma & Pi Bonds
- Topic: Hybridization of Pi Bonds
- Replies: 1
- Views: 165
Hybridization of Pi Bonds
How do you write the hybridization of pi bonds?
- Tue Dec 03, 2019 10:11 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentates
- Replies: 9
- Views: 657
Polydentates
How do I know if a ligand is polydentate? Thanks!
- Fri Nov 29, 2019 7:45 pm
- Forum: Naming
- Topic: Polydentate Ligands
- Replies: 3
- Views: 236
Polydentate Ligands
So I know polydentate ligands have multiple sites where they can bond to the same transition metal, but how do you know that it can do that? Thanks.
- Fri Nov 29, 2019 5:11 pm
- Forum: Naming
- Topic: Any Givens During the Final?
- Replies: 4
- Views: 489
Any Givens During the Final?
During the final, will we be given any information for naming coordinate compounds? (ex: what abbreviations would mean, ion charges, etc.)
- Fri Nov 29, 2019 4:44 pm
- Forum: Naming
- Topic: Amine vs Ammine?
- Replies: 3
- Views: 5722
Amine vs Ammine?
Is there a difference between amine and ammine?
- Wed Nov 27, 2019 1:02 pm
- Forum: Lewis Acids & Bases
- Topic: What is the correct definition of a base?
- Replies: 5
- Views: 351
Re: What is the correct definition of a base?
A base and a Lewis base are the same thing. Lewis base just states how Lewis describes bases (donating an electron).
- Wed Nov 27, 2019 12:59 pm
- Forum: Bronsted Acids & Bases
- Topic: Acids vs Bases
- Replies: 5
- Views: 378
Re: Acids vs Bases
Acids have a pH lower than 7, and they produce hydronium (H3O+) when they react with water. The Lewis definition of an acid states that it accepts an electron; the Bronsted definition states that it donates a proton. Bases have a pH higher than 7, and they produce hydroxide (OH-) when they react wit...
- Tue Nov 26, 2019 9:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity and dipole moments
- Replies: 8
- Views: 588
Re: Polarity and dipole moments
The dipole moments cancel out when they're facing in opposite directions. If there's a diagonal dipole, I like to break them up into the two directions it's made of (up-right, down-right, etc.) and then check if any of the other dipoles cancel it out.
I hope this helps!
I hope this helps!
- Tue Nov 26, 2019 10:21 am
- Forum: Lewis Acids & Bases
- Topic: Electron acceptor / donor
- Replies: 2
- Views: 128
Re: Electron acceptor / donor
Normally, electron acceptors (Lewis acids) are positively charged, and electron donors (Lewis bases) are negatively charged (this may not be the case all the time). For me, drawing the Lewis structure helps determine which species has lone pairs of electrons, which helps to determine the Lewis base...
- Tue Nov 26, 2019 10:19 am
- Forum: Dipole Moments
- Topic: Intermolecular force
- Replies: 5
- Views: 588
Re: Intermolecular force
Yes, if the intermolecular forces between two molecules is stronger, it will be harder to break the bonds between them. The strengths of the different types of intermolecular forces in increasing order are as follows: induced dipole-induced dipole (London forces) < dipole-dipole < ion-dipole < ion-...
- Tue Nov 26, 2019 10:09 am
- Forum: Lewis Acids & Bases
- Topic: Electron acceptor / donor
- Replies: 2
- Views: 128
Electron acceptor / donor
So I know Lewis acids are electron acceptors, and Lewis bases are electron donors. But how do you know whether a molecule accepts or donates an electron?
- Tue Nov 26, 2019 10:00 am
- Forum: Dipole Moments
- Topic: Intermolecular force
- Replies: 5
- Views: 588
Re: Intermolecular force
I believe so. Just as a side note though, the molecules aren’t bonded to each other like in a covalent or ionic bond. They’re interacting with each other/strongly attracted to each other.
I hope this helps!
I hope this helps!
- Tue Nov 26, 2019 9:06 am
- Forum: Sigma & Pi Bonds
- Topic: Promotion
- Replies: 5
- Views: 599
Re: Promotion
Yep, promotion means that an electron goes to a higher energy orbital. However, the orbital must be empty. So while carbon can promote an electron, nitrogen can’t (none of its p orbitals are empty).
I hope this helps!
I hope this helps!
- Tue Nov 26, 2019 9:02 am
- Forum: Naming
- Topic: -ate ending
- Replies: 8
- Views: 564
Re: -ate ending
-ate is for negatively charged complexes. Usually complexes are neutral or positively charged, so -ate is supposed to be a red flag/signifier.
- Wed Nov 20, 2019 1:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles in Square Pyramidal and T-Shaped
- Replies: 4
- Views: 264
Bond Angles in Square Pyramidal and T-Shaped
Hi, I'm a little confused. Are all the bond angles in square pyramidal (AX5E) 90 degrees? What about the bond angle between the two equatorial atoms? And doesn't the lone pair also affect the angle? And with t-shaped (AX3E2, AX3E3), are the bond angles 120 and 90 degrees even though there are lone p...
- Tue Nov 19, 2019 3:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: CHEM 14A Section 4B/1H VSEPR Additional Resources
- Replies: 2
- Views: 227
Re: CHEM 14A Section 4B/1H VSEPR Additional Resources
Hi Tony! The link didn't work when I tried it, but I did use it to find this one: https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_A_Molecular_Approach_(Tro)/10%3A_Chemical_Bonding_II%3A_Molecular_Shapes%2C_Valance_Bond_Theory%2C_and_Molecular_Orbital_Theory/10.3%3A_VSPER_Theory%3A_T...
- Sun Nov 03, 2019 3:04 pm
- Forum: Octet Exceptions
- Topic: Max Expanded Octets
- Replies: 2
- Views: 155
Re: Max Expanded Octets
Haley Fredricks 1B wrote:Technically, yes, but in reality it more has to do with the formal charge. Whatever makes it the lowest is how many the octet should be expanded to.
I completely forgot about that. Thank you!
- Sun Nov 03, 2019 2:49 pm
- Forum: Octet Exceptions
- Topic: Max Expanded Octets
- Replies: 2
- Views: 155
Max Expanded Octets
For atoms with expanded octets, the amount they can expand to is limited to what shell they're in, right?
For example, Si has valence electrons in the 3p shell and can expand to fill the 3d shell but not beyond that.
For example, Si has valence electrons in the 3p shell and can expand to fill the 3d shell but not beyond that.
- Sun Nov 03, 2019 2:35 pm
- Forum: General Science Questions
- Topic: Finding Formulas from Chemical Name
- Replies: 4
- Views: 236
Finding Formulas from Chemical Name
On the midterm, would we have to know how to write the molecular formula if we're given the chemical name? If so, how can I do that?
Thanks!
Thanks!
- Sun Nov 03, 2019 2:33 pm
- Forum: General Science Questions
- Topic: Study Tips
- Replies: 13
- Views: 865
Re: Study Tips
I definitely agree with all the advice here! Also, I talked to my TA about this, and he suggested using the Cornell note-taking system (although it might be too late to do that now). Here's a way you can do it if you don't know how to already: https://upload.wikimedia.org/wikipedia/commons/4/4f/Note...
- Fri Oct 25, 2019 9:01 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Question 12 Heisenberg Uncertainty Principle Online Module
- Replies: 1
- Views: 131
Re: Question 12 Heisenberg Uncertainty Principle Online Module
The answer is C.
- Fri Oct 25, 2019 8:59 am
- Forum: Ionic & Covalent Bonds
- Topic: Octet Rule Exceptions
- Replies: 3
- Views: 161
Re: Octet Rule Exceptions
They don’t need eight electrons to fill their shell. H and He only have the 1s shell, which only needs 2 electrons to fill it. Li and Be only have the 1s and 2s shell, and the 2s shell only needs two electrons to fill it.
Hope this helps!
Hope this helps!
- Tue Oct 22, 2019 3:31 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: HW 1E.5
- Replies: 2
- Views: 137
Re: HW 1E.5
In chemistry, penetration means an electron's probability density near the atom's nucleus. In other words, how close an electron can get to the nucleus. s-electrons of any shell can be close to the nucleus/have greater penetration, while the electrons of other subshells (p, d, etc.) have less penetr...
- Tue Oct 22, 2019 3:25 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: n,l,ml,and ms
- Replies: 2
- Views: 7643
Re: n,l,ml,and ms
n is the shell, l is the subshell, ml is the orbital, and ms is the electron's spin. I hope this helps!
- Tue Oct 22, 2019 3:19 pm
- Forum: General Science Questions
- Topic: Units
- Replies: 4
- Views: 230
Re: Units
Velocity: meters per second Threshold energy: Joules Plank's constant: Joules times seconds Frequency: Hz (which is also cycles per second) You can also find these on the constants and equations sheet that they give us during tests: https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/c...
- Thu Oct 17, 2019 12:33 am
- Forum: General Science Questions
- Topic: Pre-Calc and Calculus
- Replies: 3
- Views: 176
Pre-Calc and Calculus
I didn't take calculus in high school and I don't remember a lot from pre-calculus, is there anything I should review/learn about for this class? Thanks!
- Wed Oct 16, 2019 8:34 pm
- Forum: DeBroglie Equation
- Topic: De Broglie Wavelength
- Replies: 7
- Views: 291
Re: De Broglie Wavelength
The De Broglie wavelength equation is used to see if a moving particle has detectable wavelike properties.
- Wed Oct 16, 2019 1:37 pm
- Forum: Properties of Electrons
- Topic: Intensity vs. Energy
- Replies: 10
- Views: 399
Re: Intensity vs. Energy
In the photoelectric experiment, increasing the intensity would only increase the number of photons (like making a light brighter, for example). On the other hand, the researches needed to increase the energy of each individual photon. This is done by increasing the frequency of the EM wave.
- Wed Oct 16, 2019 1:31 pm
- Forum: General Science Questions
- Topic: Salt Water: Mixture or Compound?
- Replies: 4
- Views: 641
Salt Water: Mixture or Compound?
Is saltwater a mixture or a compound? From what I remember, the textbook says one thing while the internet says another. Thanks!
- Wed Oct 16, 2019 1:29 pm
- Forum: Properties of Electrons
- Topic: Orbitals and Lobes
- Replies: 3
- Views: 117
Orbitals and Lobes
Are orbitals the same as lobes? In the textbook and lecture an atom's structure is usually described as shell --> subshell --> orbital, but where do lobes fit into this? Thanks.
- Fri Oct 04, 2019 9:42 pm
- Forum: General Science Questions
- Topic: Subshells and Orbitals
- Replies: 1
- Views: 149
Subshells and Orbitals
I read that the number of subshells in an atom's shell corresponds to the principal quantum number, but is there a pattern to how many orbitals are in each subshell? Thanks!
- Fri Oct 04, 2019 9:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Study Tips/Schedule
- Replies: 4
- Views: 208
Study Tips/Schedule
I never really self-studied before and was wondering if anyone could explain to me how they plan to study for this class/any study tips in general? Thanks!
- Fri Oct 04, 2019 9:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Periodic Table on the Test
- Replies: 7
- Views: 422
Periodic Table on the Test
Hi, I'm not sure if this question has been answered already, but will we be able to bring our own copy of the periodic table to the test? Thanks.
- Thu Oct 03, 2019 12:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 244971
Re: Advice from a Medical Student - Part II [ENDORSED]
Thank you for the advice! Best wishes in medical school and beyond.
- Thu Oct 03, 2019 12:42 pm
- Forum: SI Units, Unit Conversions
- Topic: SI units for exam
- Replies: 6
- Views: 315
Re: SI units for exam
Thanks for all the information everyone! Also I think this is the link for the SI info that was mentioned earlier:
https://lavelle.chem.ucla.edu/wp-conten ... OUT_SF.pdf
https://lavelle.chem.ucla.edu/wp-conten ... OUT_SF.pdf