Search found 102 matches
- Mon Mar 15, 2021 6:24 pm
- Forum: Student Social/Study Group
- Topic: Spring Break
- Replies: 53
- Views: 3556
Re: Spring Break
A lot of rest and time outdoors!!
- Sat Mar 13, 2021 1:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Constants Sheet
- Replies: 9
- Views: 630
Re: Constants Sheet
I don't think we are allowed to highlight/annotate the equation sheet in any way.
- Sat Mar 13, 2021 1:57 pm
- Forum: Phase Changes & Related Calculations
- Topic: state properties
- Replies: 13
- Views: 829
Re: state properties
State properties focus on the destination, instead of the path taken. So for enthalpy and other state properties, it doesn't matter what happens in between, only the final and initial values. However, heat is specifically measuring the path taken because amount of heat differs for different pathways...
- Tue Mar 09, 2021 4:48 pm
- Forum: Student Social/Study Group
- Topic: What organizations are you guys in?
- Replies: 53
- Views: 3310
Re: What organizations are you guys in?
I'm in the Nikkei Student Union!
- Sun Mar 07, 2021 7:51 pm
- Forum: Student Social/Study Group
- Topic: Fave food
- Replies: 266
- Views: 39614
Re: Fave food
Boba will always be my fav!
- Sun Mar 07, 2021 7:49 pm
- Forum: Student Social/Study Group
- Topic: How do you deal with burnout?
- Replies: 144
- Views: 15624
Re: How do you deal with burnout?
I take a day off from school work every week. It's super helpful to avoid feeling overwhelmed and too stressed. I usually spend it catching up on sleep and other non-school responsibilities, while spending time with family! Good luck, you've got this!
- Sun Mar 07, 2021 7:48 pm
- Forum: General Rate Laws
- Topic: Multiple Reactants
- Replies: 7
- Views: 394
Re: Multiple Reactants
One thing I remember is that to calculate the overall order of multiple reactants, you add their exponents together. He goes over this towards the end of the lecture on Friday. You can also take a look at the unique average rate for a reaction. Yea Friday's lecture goes over how multiple reactants ...
- Sun Mar 07, 2021 7:46 pm
- Forum: Student Social/Study Group
- Topic: Chem Final
- Replies: 13
- Views: 814
Re: Chem Final
The final is supposed to be cumulative, with the number of problems per topic equating to the amount of time spent on each topic. Hope this helps!
- Sun Mar 07, 2021 7:44 pm
- Forum: Student Social/Study Group
- Topic: Anxiety
- Replies: 109
- Views: 7820
Re: Anxiety
Although I try to study as often as possible, I usually don't do work on Saturdays, just so I can have a day to relax, catch up on sleep, take care of other responsibilities, and spend time with family. After a rest day, I usually feel refreshed and ready to keep studying. It's super helpful to avoi...
- Fri Feb 26, 2021 5:52 pm
- Forum: Balancing Redox Reactions
- Topic: Acidic vs. Basic
- Replies: 20
- Views: 828
Re: Acidic vs. Basic
In acidic conditions, you can just add H+ ions to balance the equation. However, in basic conditions, you must use water to balance the hydrogen. You have to add one water for every H+ you need, and then add the same number of OH- to the other side.
- Fri Feb 26, 2021 5:46 pm
- Forum: Balancing Redox Reactions
- Topic: sapling week 7/8 #3
- Replies: 2
- Views: 198
Re: sapling week 7/8 #3
With a basic solution, the rule of thumb is to always balance the oxygens with water. Then, to balance the hydrogen, you add one water per H+ that you need. So if you need 2 H+, you will add 2 waters. Then, you'll add OH- to the other side. You should add the same number of OH- as the water you just...
- Fri Feb 26, 2021 5:42 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling Week 7/8 #18
- Replies: 2
- Views: 232
Re: Sapling Week 7/8 #18
This problem is a little tricky because since Fe2O3 is multiplied by H2O, any coefficient that you add to Fe2O3 will be multiplied by the number of H2O. For example, if you add a 2 in front of Fe2O3, there are now also 2H2O. Hope this helps!
- Tue Feb 23, 2021 12:18 pm
- Forum: Balancing Redox Reactions
- Topic: W7/8 Sapling #18
- Replies: 3
- Views: 274
Re: W7/8 Sapling #18
KatarinaReid_3H wrote:I am still confused because I retried it and this is wrong. I may have misinterpreted what you meant.
You would have to change the reactants H2O, not the products H2O. So on the reactants, it should be 6 H2O and 3 H2O on the products.
- Sun Feb 21, 2021 10:07 pm
- Forum: Student Social/Study Group
- Topic: Classes for next quarter?
- Replies: 165
- Views: 16150
Re: Classes for next quarter?
I'm taking LS7C, Chem 14C, and a nursing anatomy course!
- Sun Feb 21, 2021 10:06 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Which side to put the electrode on a cell diagram
- Replies: 4
- Views: 350
Re: Which side to put the electrode on a cell diagram
Great. Thanks everyone!
- Sun Feb 21, 2021 10:05 pm
- Forum: Student Social/Study Group
- Topic: We made it through Midterm 2!
- Replies: 71
- Views: 3972
Re: We made it through Midterm 2!
Great work everyone! Hope you all got a chance to rest.
- Sat Feb 20, 2021 6:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Which side to put the electrode on a cell diagram
- Replies: 4
- Views: 350
Which side to put the electrode on a cell diagram
On Friday's lecture, Dr. Lavelle gave the example of the cell diagram:
Cu(s)/Cu2+(aq)//Fe3+(aq), Fe2+(aq)/Pt(s)
Why did he put the electrode on the right side, and does it matter if it's on the right or left side? Thanks in advance!
Cu(s)/Cu2+(aq)//Fe3+(aq), Fe2+(aq)/Pt(s)
Why did he put the electrode on the right side, and does it matter if it's on the right or left side? Thanks in advance!
- Sat Feb 20, 2021 6:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14 B Final
- Replies: 34
- Views: 1629
Re: Chem 14 B Final
The final should be cumulative.
- Sat Feb 20, 2021 6:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: anode and cathode L/R
- Replies: 14
- Views: 683
Re: anode and cathode L/R
In Friday's lecture, he said that in reality the anodes and cathodes can be on either side, but conventionally, they are represented as anode on the left and cathode on the right.
- Mon Feb 15, 2021 1:20 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: temperature
- Replies: 32
- Views: 1352
Re: temperature
Yes! Be sure to add the amount of degrees Celsius to 273 to get your temperature in Kelvin
- Mon Feb 15, 2021 1:19 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Meaning of K
- Replies: 55
- Views: 3953
Re: Meaning of K
Yes, K always means equilibrium constant
- Mon Feb 15, 2021 1:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2
- Replies: 14
- Views: 659
Re: Midterm 2
He said in his email that this midterm will have more partial credit opportunities than MT 1...
- Mon Feb 15, 2021 1:17 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2 Nerves
- Replies: 40
- Views: 1909
Re: Midterm 2 Nerves
Hello, I am also very nervous but here are some things I'm doing to help myself feel more prepared for the test! 1.) Of course, workin on sapling and tb problems, but also making note of what TYPES of questions there are (how they ask the question). Often times the question itself seems very daunti...
- Mon Feb 15, 2021 1:14 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2 Nerves
- Replies: 40
- Views: 1909
Re: Midterm 2 Nerves
If it helps, I always feel like midterm nerves motivate me to study more! Take advantage of these feelings because you still have a couple days! Best of luck
- Tue Feb 09, 2021 2:16 pm
- Forum: Student Social/Study Group
- Topic: Test curve?
- Replies: 40
- Views: 3139
Re: Test curve?
Lavelle doesn't curve because many people get 100%...
- Tue Feb 09, 2021 2:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2
- Replies: 6
- Views: 405
Re: Midterm 2
We will find out more information later this week!
- Mon Feb 01, 2021 10:06 pm
- Forum: Phase Changes & Related Calculations
- Topic: Why does steam cause severe burns?
- Replies: 22
- Views: 1773
Re: Why does steam cause severe burns?
Steam has far more energy than liquid water or ice. Therefore, if you put your hand in steam, your hand will absorb more energy, than if it were to touch hot water, causing the severe burn!
- Mon Feb 01, 2021 9:55 pm
- Forum: Student Social/Study Group
- Topic: Average amount of study hours per week
- Replies: 28
- Views: 1273
Re: Average amount of study hours per week
I probably don't study as much as I should, but I end up doing about 8 hours a week (on a good week).
- Mon Feb 01, 2021 9:54 pm
- Forum: Student Social/Study Group
- Topic: Work Life Balance
- Replies: 44
- Views: 1771
Re: Work Life Balance
I think setting realistic goals for the day would truly be helpful. If you think an assignment would be a lot of work, start immediately and divide the task into small sections before the deadline. Spacing out your learning can really help you feel less stressed. Also, when you're doing work avoid ...
- Mon Feb 01, 2021 9:53 pm
- Forum: Student Social/Study Group
- Topic: Work Life Balance
- Replies: 44
- Views: 1771
Re: Work Life Balance
Although it may sound counterintuitive, prioritize sleep, exercise, and good nutrition over studying! When your body is functioning optimally, you can focus better and will be able to absorb and recall information far more efficiently! Stay strong and know that you aren't alone.
- Mon Feb 01, 2021 9:25 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 4
- Views: 292
Re: Midterm
It usually takes about a week, but fingers crossed that it'll be sooner!
- Mon Jan 25, 2021 12:11 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 6A.23 Textbook Question
- Replies: 4
- Views: 249
Re: 6A.23 Textbook Question
Hi! For this problem, it’s helpful to know that because Ba(OH)2 is an alkaline earth hydroxide, it is a strong base. As such, we would expect the reaction Ba(OH)2(aq) —> Ba2+(aq) + 2OH-(aq) to go to completion. To start, we can convert the 0.43g Ba(OH)2 to its molar concentration (use molar mass an...
- Mon Jan 25, 2021 12:05 am
- Forum: Student Social/Study Group
- Topic: Study Guide - Midterm?
- Replies: 14
- Views: 834
Re: Study Guide - Midterm?
I find it super helpful to just go through the section outlines!
- Mon Jan 25, 2021 12:02 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling #3
- Replies: 8
- Views: 359
Re: Sapling #3
Exactly as above! As far as I know the Ka is small enough compared to the initial concentration that you can disregard x in the denominator. So, I originally did it this way, but since the percent ionized is greater than 5%, you actually have to include the x in the denominator, regardless of the K...
- Mon Jan 25, 2021 12:01 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling #3
- Replies: 8
- Views: 359
Re: Sapling #3
I created an ICE table using the initial concentration of lactic acid. Since you know the Ka value, you can solve for the x values, and find the [H3O+] value. From there, you can solve for pH=-log(H3O+), find pOH with 14= pH+pOH, and finally find the percent ionization with the equation [CH3CH(OH)C...
- Sun Jan 24, 2021 11:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling #3
- Replies: 8
- Views: 359
Re: Sapling #3
I created an ICE table using the initial concentration of lactic acid. Since you know the Ka value, you can solve for the x values, and find the [H3O+] value. From there, you can solve for pH=-log(H3O+), find pOH with 14= pH+pOH, and finally find the percent ionization with the equation [CH3CH(OH)CO...
- Tue Jan 19, 2021 2:44 pm
- Forum: Student Social/Study Group
- Topic: Midterms?
- Replies: 14
- Views: 771
Re: Midterms?
Midterm 1 is Jan 29 :)
- Tue Jan 19, 2021 2:42 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: conjugate base
- Replies: 14
- Views: 504
Re: conjugate base
A conjugate base of a weak acid will be a strong base.
- Tue Jan 19, 2021 1:02 pm
- Forum: Phase Changes & Related Calculations
- Topic: Usage of Ph with acids and bases
- Replies: 6
- Views: 248
Re: Usage of Ph with acids and bases
pH= -log([h3O+]). Therefore, you should always try to solve for the [H3O+] value, in order to find pH. You can also solve for the [OH-], to get the pOH with pOH=-log([OH-]). From there, you can solve for pH by using 14=pH+ pOH. Hope this helps!
- Tue Jan 19, 2021 12:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: A + B
- Replies: 5
- Views: 316
Re: A + B
Yes, we would assume that it is not a solid or a liquid, but we will almost always be told the state of matter.
- Tue Jan 19, 2021 12:55 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temperature
- Replies: 45
- Views: 1445
Re: Temperature
If the reaction is exothermic, than increasing the temperature would favor reactants and vice versa.
- Mon Jan 11, 2021 12:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K in relation to shifting right/left
- Replies: 8
- Views: 362
Re: K in relation to shifting right/left
You are correct! Since the k= [products]/[reactants], a large k value would mean a large product concentration and that the reaction favors products. Therefore, the reaction lies to the right and vice versa.
- Mon Jan 11, 2021 12:01 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: New Research on Hydrogen Bonding
- Replies: 2
- Views: 3205
Re: New Research on Hydrogen Bonding
Very interesting! Thank you for sharing :)
- Mon Jan 11, 2021 12:00 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 32
- Views: 1237
Re: Study Tips
I think the best technique is to just drill problems, as opposed to looking at and reviewing notes. You'll be more engaged with the content. Also, try to do this every night, so that you don't have to cram before the test.
- Mon Jan 11, 2021 11:59 am
- Forum: Student Social/Study Group
- Topic: Study Habits
- Replies: 96
- Views: 6420
Re: Study Habits
After taking Chem 14a, I realized that I didn't fully take advantage of the extra help that was available--outside of lecture. So this quarter I'm trying my best to attend as many sessions as possible. Me too! I only began to go to them the week before the final and am now regretting not fully util...
- Mon Jan 11, 2021 11:58 am
- Forum: Student Social/Study Group
- Topic: Study Habits
- Replies: 96
- Views: 6420
Re: Study Habits
It's always helpful to quiz yourself and practice test problems, instead of just reading notes! Also, be sure to do a little every night, like in 30 minute chunks, so that you don't have to cram for the final.
- Mon Jan 11, 2021 11:57 am
- Forum: Student Social/Study Group
- Topic: Comfort Movies
- Replies: 168
- Views: 27361
Re: Comfort Movies
I love Harry Potter so that always brings comfort.
- Wed Jan 06, 2021 12:14 pm
- Forum: Ideal Gases
- Topic: K and PV=nRT
- Replies: 9
- Views: 927
Re: K and PV=nRT
You can use PV=nRT to convert the atm to concentration. PV=nRT can be written as P=nRT/V. n/V=concentration, so P=conc(RT). Then, you can solve for concentration and then plug that value into K=[P]/[R].
- Wed Jan 06, 2021 12:06 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reverse Reactions
- Replies: 12
- Views: 556
Re: Reverse Reactions
If you reverse the reaction, the original reactants are now the product and the original products are now the reactants. If you were to plug those numbers into the Kc equation, you would get the reciprocal of the original reaction Kc. Hope this helps!
- Wed Jan 06, 2021 12:03 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Kc
- Replies: 15
- Views: 553
Re: K vs. Kc
K just represents concentration, whereas Kc represents the constant equilibrium concentration.
- Mon Jan 04, 2021 7:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: sapling for chem 14b
- Replies: 3
- Views: 131
Re: sapling for chem 14b
You have to click the use credit option. It didn't work for me yesterday, but I tried it again today and it went through. So if it doesn't work for you, I'd say wait a day :) hope this helps!
- Mon Dec 07, 2020 2:42 pm
- Forum: Student Social/Study Group
- Topic: Finals Study Things
- Replies: 27
- Views: 1402
Re: Finals Study Things
So nice of you to share. Thank you!!
- Mon Dec 07, 2020 2:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Unable to view the lectures
- Replies: 12
- Views: 681
Re: Unable to view the lectures
I'm having this issue to, but my connection was fine so I assumed it was CCLE and decided to wait on watching it.
- Mon Dec 07, 2020 2:40 pm
- Forum: Student Social/Study Group
- Topic: Calculating grade
- Replies: 24
- Views: 1562
Re: Calculating grade
You can plug in all of your assignment grades into this calculator to find your overall grade. https://www.rapidtables.com/calc/grade/ ... lator.html
- Mon Dec 07, 2020 2:38 pm
- Forum: Naming
- Topic: Naming quizlet
- Replies: 41
- Views: 1856
Re: Naming quizlet
This was very nice of you to share. Thank you!
- Mon Dec 07, 2020 2:37 pm
- Forum: General Science Questions
- Topic: Terminal Atom
- Replies: 4
- Views: 366
Terminal Atom
What is a terminal atom? Is it just an atom that is not in the center? Thanks!
- Mon Nov 30, 2020 12:26 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Memorizing Common Ligands
- Replies: 6
- Views: 294
Re: Memorizing Common Ligands
On Lavelle's website, he has a list of ligand names, so if we are supposed to memorize anything, it is likely his list.
- Mon Nov 30, 2020 12:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Type of Bond from Shape
- Replies: 12
- Views: 573
Re: Determining Type of Bond from Shape
You cannot tell the type of bond just based on the shape, since double and triple bonds are still regarded as one region of electron density. You must draw the lewis dot structure to know. Hope this helps!
- Mon Nov 30, 2020 12:19 pm
- Forum: Naming
- Topic: Using ido or o
- Replies: 24
- Views: 926
Re: Using ido or o
He said that both are acceptable, but -o is more common and widely used in chemistry.
- Mon Nov 30, 2020 11:57 am
- Forum: Naming
- Topic: Greek Prefixes
- Replies: 5
- Views: 236
Re: Greek Prefixes
Oh okay. Thank you! That makes sense now.
- Mon Nov 30, 2020 11:48 am
- Forum: Naming
- Topic: Greek Prefixes
- Replies: 5
- Views: 236
Greek Prefixes
In today's lecture, Lavelle said that you cannot have the same prefix twice in the name of a coordination compound. So when you have di-, tri-, or tetra-, is it the ligand or the hydrate that changes to bis-, tris-, tetrakis-, or pentakis-?
- Mon Nov 23, 2020 6:49 pm
- Forum: Hybridization
- Topic: More than 6 electron densities
- Replies: 5
- Views: 344
Re: More than 6 electron densities
Shapes with more than 6 electron densities definitely exist. However, that is way beyond our class lol
- Mon Nov 23, 2020 6:48 pm
- Forum: Student Social/Study Group
- Topic: grade worries
- Replies: 119
- Views: 19845
Re: grade worries
Everyone at some point feels anxious about their grade, but all we can do is try our best!
- Mon Nov 23, 2020 6:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sapling #17, Week 7/8
- Replies: 7
- Views: 292
Re: Sapling #17, Week 7/8
The 60 degree angle comes from the triangular configuration!
- Mon Nov 23, 2020 6:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Axial vs Equatorial atoms
- Replies: 8
- Views: 379
Re: Axial vs Equatorial atoms
Axial is on the vertical plane, whereas equatorial is on the horizontal plane.
- Mon Nov 23, 2020 6:44 pm
- Forum: Significant Figures
- Topic: 40. versus 40
- Replies: 23
- Views: 1638
Re: 40. versus 40
Yes, that's correct! On Lavelle's website, he has a cheat sheet on the rules of sig figs that you might find helpful.
- Mon Nov 16, 2020 12:01 pm
- Forum: Student Social/Study Group
- Topic: Exercising Our Minds and Bodies
- Replies: 120
- Views: 19376
Re: Exercising Our Minds and Bodies
I like to take virtual dance classes!
- Mon Nov 16, 2020 11:56 am
- Forum: Bond Lengths & Energies
- Topic: Hydrogen Bonding
- Replies: 13
- Views: 434
Re: Hydrogen Bonding
No, Hydrogen bonding can only be between H and F, O, N.
- Mon Nov 16, 2020 11:55 am
- Forum: Bond Lengths & Energies
- Topic: Valence electrons of nitrogen
- Replies: 10
- Views: 461
Re: Valence electrons of nitrogen
He was referring to the fact that you must complete Nitrogen's octet, which would give you 8 valence electrons.
- Mon Nov 16, 2020 11:53 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Unpaired Electrons
- Replies: 2
- Views: 198
Re: Unpaired Electrons
Think back to one of the first lectures in this section where he drew the paired arrows for each subshell. For every number following the subshell, like a 4 in 3p4, there are that many atoms. Since there is room for 6 electrons in every p subshell, there will be 3 pairs of electrons. If we look at t...
- Mon Nov 16, 2020 11:43 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: intermolecular energy equation clarification
- Replies: 4
- Views: 203
Re: intermolecular energy equation clarification
We have never been given the full equation, so we only need to know the proportionality equation and the relationships between the variables. The equation can also represent just two atoms. Hope this helps!
- Mon Nov 09, 2020 12:43 pm
- Forum: Ionic & Covalent Bonds
- Topic: Dipole moments / covalent bonds
- Replies: 3
- Views: 168
Re: Dipole moments / covalent bonds
If the dipole moment equals charge * distance and distance is affected by the number of bonds, then the number of bonds will affect the dipole moment. Since a higher number of bonds results in shorter distance, triple and double bonds will have a lower dipole moment than single bonds. Hope this helps!
- Mon Nov 09, 2020 12:37 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Exceptions
- Replies: 1
- Views: 183
Re: Electron Configuration Exceptions
There are exceptions for every element that falls at d4 and d9. Silver and copper are in the same group, so you would apply the same the same pattern of filling the d block to d10 and then removing an electron from the s block to make the configuration more stable. You would do this for every elemen...
- Mon Nov 09, 2020 12:28 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Finding Magnetic Quantum Number
- Replies: 2
- Views: 143
Re: Finding Magnetic Quantum Number
The values of m can range between -l and +l. For every l value, there are 2l+1 values that m can be. Hope this helps!
- Mon Nov 09, 2020 12:24 pm
- Forum: Bond Lengths & Energies
- Topic: bond lengths
- Replies: 9
- Views: 483
Re: bond lengths
Bond lengths are influenced by many factors, such as number of bonds and size of the atom. Double and triple bonds have shorter bond lengths than single bonds. Additionally, larger atoms will have larger bond lengths. If a problem provides the energy of a bond, then we can infer the length of the bo...
- Mon Nov 09, 2020 12:20 pm
- Forum: Ionic & Covalent Bonds
- Topic: negative energies for attractive interactions
- Replies: 7
- Views: 323
Re: negative energies for attractive interactions
The strength of the bond is measured by its dissociation energy, or the energy required to break a bond. Therefore, the value is negative to represent the energy lost by the bond when it breaks.
- Mon Nov 02, 2020 12:42 pm
- Forum: SI Units, Unit Conversions
- Topic: Converting equations
- Replies: 16
- Views: 902
Re: Converting equations
I printed out Lavelle's formula sheet and have just recorded a bunch of common conversions. It has helped me become more familiar with them conceptionally, and I am more confident converting them for assignments.
- Mon Nov 02, 2020 12:39 pm
- Forum: Lewis Structures
- Topic: Delocalized Definition
- Replies: 4
- Views: 302
Re: Delocalized Definition
Delocalized electrons refer to electrons that are shared between different atoms, which result in the hybrid structures.
- Mon Nov 02, 2020 12:36 pm
- Forum: Resonance Structures
- Topic: Delocalization of electrons
- Replies: 10
- Views: 523
Re: Delocalization of electrons
The term delocalized electrons refers to the sharing of electrons between different atoms. So, yes, electrons are shared equally.
- Mon Nov 02, 2020 12:34 pm
- Forum: Resonance Structures
- Topic: Lecture 11/2
- Replies: 5
- Views: 164
Re: Lecture 11/2
The minus sign in the formula NO3^- indicates that there is an extra electron. Therefore, he had to add that electron to the total number found from N and the 3 O's.
- Mon Nov 02, 2020 12:33 pm
- Forum: Ionic & Covalent Bonds
- Topic: Non Metals
- Replies: 10
- Views: 785
Re: Non Metals
Non-metals have higher ionization energy than metals. Ionization energy is the amount of energy required to remove an electron. Therefore, it is much more likely for metals, with low ionization energy, to lose an electron than for nonmetals.
- Mon Oct 26, 2020 4:16 pm
- Forum: Student Social/Study Group
- Topic: Lavelle's Jokes
- Replies: 26
- Views: 2284
Re: Lavelle's Jokes
I would add a chemistry pun, but the best ones Argon.
- Mon Oct 26, 2020 12:12 pm
- Forum: Limiting Reactant Calculations
- Topic: What counts as theoretical yield?
- Replies: 8
- Views: 509
Re: What counts as theoretical yield?
Theoretical yield is the amount of the products based on the limiting reactants and the molar ratios. If you calculate how many moles of the products will be produced by the limiting reactant, you can convert that to grams to find the theoretical yield. The actual yield will be given and is based on...
- Mon Oct 26, 2020 12:08 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Determining Spin in orbitals [ENDORSED]
- Replies: 5
- Views: 271
Re: Determining Spin in orbitals [ENDORSED]
The number of arrows corresponds to the number of electrons. For example, if I had the configuration for Nitrogen, [He] 2s2 2p3, I would only put 3 arrows in the 2p level. I would only draw 3 uncomplemented arrows because it represents a more stable electron. You must fill all of the subshells first...
- Mon Oct 26, 2020 12:03 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Atomic spectroscopy vs molecular spectroscopy
- Replies: 2
- Views: 220
Re: Atomic spectroscopy vs molecular spectroscopy
Atomic orbitals and molecular orbitals can be used interchangeably, so there is no difference.
- Mon Oct 26, 2020 12:01 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbital vs. Subshell
- Replies: 13
- Views: 851
Re: Orbital vs. Subshell
An atomic orbital is defined as a region of space in which there is a high probability of finding an electron in an atom (s, p, d, f). A subshell is all the atomic orbitals of an atom that have the same l value. Hope this helps!
- Sun Oct 25, 2020 4:00 pm
- Forum: General Science Questions
- Topic: Lyman vs. Balmer Series
- Replies: 5
- Views: 348
Lyman vs. Balmer Series
Does anyone have any tips for remembering which EM spectrum region is Balmer and which on is Lyman? I keep getting mixed up. Thank you!
- Mon Oct 19, 2020 12:44 pm
- Forum: DeBroglie Equation
- Topic: lecture 8 worked example
- Replies: 3
- Views: 193
Re: lecture 8 worked example
If you look on his website, there is a list of constants and equations. The mass of the electron is given on this sheet as 9.109383*10^-31 kg.
- Mon Oct 19, 2020 12:43 pm
- Forum: Photoelectric Effect
- Topic: Light Intensity
- Replies: 23
- Views: 565
Re: Light Intensity
The intensity of the light refers to the number of photons, and results in no changes to the wavelength or frequency.
- Mon Oct 19, 2020 12:41 pm
- Forum: Photoelectric Effect
- Topic: Circular Standing Wave model
- Replies: 2
- Views: 110
Circular Standing Wave model
In response to the Circular Standing Wave model, is it safe to say that there will be one wave for every spectral line?
- Mon Oct 19, 2020 12:35 pm
- Forum: DeBroglie Equation
- Topic: E=pc and E=pv
- Replies: 10
- Views: 346
Re: E=pc and E=pv
Both equations mean the same thing, but c represents speed of light and v represents velocity (which should just be the speed of light).
- Mon Oct 19, 2020 12:33 pm
- Forum: DeBroglie Equation
- Topic: Mass of an Object in the DeBroglie Equation
- Replies: 3
- Views: 139
Re: Mass of an Object in the DeBroglie Equation
All masses have wavelike property, but only small objects can be observed to have these wavelike properties. This is because momentum=mass*velocity. If an object has a large mass, it will have a large momentum as well. Since wavelength=h/momentum, mass and wavelength are inversely proportional. So i...
- Tue Oct 13, 2020 2:55 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1B.27
- Replies: 3
- Views: 188
Re: 1B.27
The +- 5 is the uncertainty in velocity. You will have to use the value delta v= 10m/s to solve for delta p, which you'll use to find delta x.
Hope this helps!
Hope this helps!
- Tue Oct 13, 2020 2:48 pm
- Forum: Einstein Equation
- Topic: Equation Sheet
- Replies: 15
- Views: 542
Re: Equation Sheet
I believe that we will be given constants in every question, but I'm not sure about equations.
- Tue Oct 13, 2020 2:46 pm
- Forum: Limiting Reactant Calculations
- Topic: Difference between limiting reactant and limiting reagent?
- Replies: 14
- Views: 2338
Re: Difference between limiting reactant and limiting reagent?
Reactants and reagents are the same thing, so there is no difference between limiting reactant and limiting reagent.
- Tue Oct 13, 2020 2:45 pm
- Forum: Properties of Light
- Topic: Electric and Magnetic Fields of Light
- Replies: 2
- Views: 118
Re: Electric and Magnetic Fields of Light
This is more of a physics concept, so I don't think that we need to know why and how they interact, but just that light is electromagnetic radiation. Electric fields are made from opposing charges, whereas magnetic fields are made from opposing poles. The waves in the field move together creating el...
- Tue Oct 13, 2020 12:45 pm
- Forum: Properties of Electrons
- Topic: Wavelike characteristics of objects
- Replies: 4
- Views: 215
Re: Wavelike characteristics of objects
You are correct. We cannot observe wavelike characteristics from large objects because the wavelength is too small to be measured. Since wavelength is inversely proportional to momentum, and momentum is proportional to mass, wavelength is also inversely proportional to mass. Therefore, the large obj...
- Mon Oct 05, 2020 9:47 pm
- Forum: General Science Questions
- Topic: Meaning of a notation
- Replies: 4
- Views: 169
Re: Meaning of a notation
This sign means that the variables are proportional to each other. We can also say the variables are proportional to each other if it was written as "E=vh" or "E=v/a" (a is just a random variable that I made up ;)). I hope this helps!
- Mon Oct 05, 2020 9:43 pm
- Forum: SI Units, Unit Conversions
- Topic: Conversion of grams to moles and millimoles to moles.
- Replies: 9
- Views: 4032
Re: Conversion of grams to moles and millimoles to moles.
My HS Chem teacher once said that moles are always the starting point for calculations, so it's important to understand how to solve for them. Let's say you are given an amount of 24 grams of Carbon, and you need to solve for the moles. On your periodic table, you will find that the molar mass of Ca...
- Mon Oct 05, 2020 9:38 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: molar mass vs molecular mass
- Replies: 6
- Views: 836
Re: molar mass vs molecular mass
No questions are stupid lol. Molar mass is the ratio of grams per mole, whereas molecular mass is the mass of a given molecule. Hope this helps :)