Search found 113 matches
- Mon Mar 15, 2021 11:14 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: sapling #11 week 9/10
- Replies: 1
- Views: 300
sapling #11 week 9/10
Hi, can someone explain how to solve for this question, I've been struggling. Dinitrogen pentoxide, N2O5, decomposes by first‑order kinetics with a rate constant of 3.7×10−5 s−1 at 298 K. What is the half‑life, in hours, of N2O5 at 298 K? If [N2O5]0=0.0512 mol⋅L−1, what will be the concentration of ...
- Mon Mar 15, 2021 11:12 pm
- Forum: General Rate Laws
- Topic: sapling week 9/10 #7
- Replies: 2
- Views: 310
sapling week 9/10 #7
For #7 on Sapling, I'm still struggling with this question.
Write the rate law for the reaction where k is the rate constant.
How do we find the rate law?
Write the rate law for the reaction where k is the rate constant.
How do we find the rate law?
- Mon Mar 15, 2021 11:10 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: sapling week 9/10 #20
- Replies: 4
- Views: 779
sapling week 9/10 #20
Hi, I've been having trouble with this question on Sapling, can anyone help? The presence of a catalyst provides a reaction pathway in which the activation energy of a reaction is reduced by 44.00 kJ⋅mol−1 . Uncatalyzed: A⟶B Ea=116.00 kJ⋅mol−1 Catalyzed: A⟶B Ea=72.00 kJ⋅mol−1 Determine the factor by...
- Sun Mar 14, 2021 8:55 am
- Forum: Administrative Questions and Class Announcements
- Topic: points on final?
- Replies: 8
- Views: 938
points on final?
How many points is the final worth?
- Sun Mar 14, 2021 8:50 am
- Forum: General Science Questions
- Topic: Pre-Law/Pre-Med Students
- Replies: 20
- Views: 1643
Re: Pre-Law/Pre-Med Students
I'm also thinking about pre-med. It's a long road and a lot of hard work but that will make it so much more worth it. I believe it's definitely do-able if you put all your effort and hard work into it and keep trying. Not easy though!
- Sun Mar 14, 2021 8:48 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 3
- Views: 702
Final
Goodluck on the final everyone!! Trust all the hard work
- Fri Mar 12, 2021 7:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem community points
- Replies: 19
- Views: 1526
Chem community points
When are chem community points due?
- Fri Mar 12, 2021 7:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 48
- Views: 3126
Re: Final
The textbook problems are very helpful for me!!
- Fri Mar 12, 2021 7:55 pm
- Forum: General Science Questions
- Topic: Final Exam
- Replies: 39
- Views: 2327
Re: Final Exam
Goodluck on the final!!!
- Fri Mar 12, 2021 7:54 pm
- Forum: General Science Questions
- Topic: Final Nerves and thoughts
- Replies: 11
- Views: 1015
Re: Final Nerves and thoughts
I'm probably going to spend it studying but try not to stress too much! We got this !!
- Tue Mar 09, 2021 9:37 am
- Forum: Student Social/Study Group
- Topic: Chemistry Community Posts
- Replies: 16
- Views: 1008
Re: Chemistry Community Posts
I would say confirm with your TA just to be sure!!
- Tue Mar 09, 2021 9:35 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 48
- Views: 3126
Re: Final
These are great tips, thank you!!
- Tue Mar 09, 2021 9:34 am
- Forum: General Science Questions
- Topic: 14C chemistry community
- Replies: 5
- Views: 694
14C chemistry community
Will we use chemistry community for 14C?
- Tue Mar 09, 2021 9:33 am
- Forum: General Science Questions
- Topic: No Lavelle Chem 14C?
- Replies: 68
- Views: 5888
Re: No Lavelle Chem 14C?
I don't think he will be teaching for 14C, super sad about it :(
- Tue Mar 09, 2021 9:32 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: What was your favorite chem topic?
- Replies: 137
- Views: 12938
Re: What was your favorite chem topic?
Chem Equilibrium for me!!
- Sun Feb 28, 2021 4:10 pm
- Forum: Balancing Redox Reactions
- Topic: Week 7/8 #3
- Replies: 8
- Views: 932
Re: Week 7/8 #3
I was having trouble with this but thank you for these instructions!! Super helpful
- Sun Feb 28, 2021 4:06 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Sapling Question #17
- Replies: 6
- Views: 410
Re: Sapling Question #17
I was struggling with #17 as well but this is super helpful, thank you!!
- Sun Feb 28, 2021 4:05 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: sapling week 7/8 #15
- Replies: 1
- Views: 256
sapling week 7/8 #15
Calculate the cell potential for the reaction as written at 25.00 °C , given that [Zn2+]=0.790 M and [Ni2+]=0.0110 M . Use the standard reduction potentials in this table.
Zn(s)+Ni2+(aq)↽−−⇀ Zn2+(aq)+Ni(s)
Can someone explain how to start this question?
Zn(s)+Ni2+(aq)↽−−⇀ Zn2+(aq)+Ni(s)
Can someone explain how to start this question?
- Sun Feb 28, 2021 4:03 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: sapling week 7/8 #12
- Replies: 6
- Views: 3406
sapling week 7/8 #12
Calculate the standard free-energy change for the reaction at 25 ∘C.
Refer to the list of standard reduction potentials.
2Au3+(aq)+3Zn(s)↽−−⇀2Au(s)+3Zn2+(aq)
How is delta G calculated in this question?
Refer to the list of standard reduction potentials.
2Au3+(aq)+3Zn(s)↽−−⇀2Au(s)+3Zn2+(aq)
How is delta G calculated in this question?
- Sun Feb 28, 2021 3:59 pm
- Forum: Balancing Redox Reactions
- Topic: week 7/8 sapling 8
- Replies: 4
- Views: 377
week 7/8 sapling 8
Hi, what are the steps to starting this question?
Separate this redox reaction into its balanced component half‑reactions. Use the symbol e− for an electron.
Cl2+2Li⟶2LiCl
Separate this redox reaction into its balanced component half‑reactions. Use the symbol e− for an electron.
Cl2+2Li⟶2LiCl
- Sun Feb 21, 2021 12:04 pm
- Forum: General Science Questions
- Topic: MT 2 grades
- Replies: 34
- Views: 2155
MT 2 grades
Does anyone know when midterm 2 grades will be up?
- Sun Feb 21, 2021 12:03 pm
- Forum: General Science Questions
- Topic: No Lavelle Chem 14C?
- Replies: 68
- Views: 5888
Re: No Lavelle Chem 14C?
I believe that the 14C lectures will be recorded and able to watch at a different time
- Sun Feb 21, 2021 12:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem community points
- Replies: 10
- Views: 626
Chem community points
How many posts should we have by the end of week 7?
- Sun Feb 21, 2021 12:00 pm
- Forum: Student Social/Study Group
- Topic: We made it through Midterm 2!
- Replies: 71
- Views: 4726
Re: We made it through Midterm 2!
Good luck to everyone still taking midterms!! Glad we got through this second one in chem !
- Thu Feb 18, 2021 10:00 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 4A.7
- Replies: 1
- Views: 174
4A.7
Hi, can someone walk me through how to solve this question from the textbook? I'm a little confused (a) Calculate the heat that must be supplied to a copper kettle of mass 400.0 g containing 300.0 g of water to raise its temperature from 20.0°C to the boiling point of water, 100.0°C. (b) What percen...
- Sat Feb 13, 2021 2:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: tips if you're struggling!
- Replies: 77
- Views: 5683
Re: tips if you're struggling!
This is all super helpful thank you everyone!!!
- Sat Feb 13, 2021 2:29 pm
- Forum: General Science Questions
- Topic: Tips
- Replies: 53
- Views: 2653
Re: Tips
I've been struggling a lot with the topics we've been doing lately as well. These tips are super helpful thanks everyone!
- Sat Feb 13, 2021 1:58 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: sapling week 5/6 assignment #15
- Replies: 6
- Views: 457
sapling week 5/6 assignment #15
can anyone walk me through how to start this equation?
Given the information
A+BC⟶2D⟶DΔH∘ΔH∘=710.6 kJΔS∘=323.0 J/K=514.0 kJΔS∘=−226.0 J/K
calculate ΔG∘ at 298 K for the reaction
A+B⟶2C
Given the information
A+BC⟶2D⟶DΔH∘ΔH∘=710.6 kJΔS∘=323.0 J/K=514.0 kJΔS∘=−226.0 J/K
calculate ΔG∘ at 298 K for the reaction
A+B⟶2C
- Sat Feb 13, 2021 11:52 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: week 5/6 sapling assignment #5
- Replies: 1
- Views: 150
week 5/6 sapling assignment #5
Hi a question on sapling says The molar heat capacity for carbon monoxide at constant volume is CV, m=20.17 J/(K·mol) . A 10.00 -L fixed-volume flask contains CO(g) at a pressure of 6.00 kPa and a temperature of 25.0 °C. Assuming that carbon monoxide acts as an ideal gas and that its heat capacity i...
- Sat Feb 13, 2021 11:48 am
- Forum: Phase Changes & Related Calculations
- Topic: week 5/6 sapling assignment
- Replies: 2
- Views: 257
week 5/6 sapling assignment
When given a positive or negative sign for delta H or delta S, how do we know what the phase change should be? If delta H is positive and delta S is positive, how can we tell if the phase change is from liquid to gas, solid to gas, liquid to gas, etc.?
- Sat Feb 13, 2021 11:41 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Sapling 3 Week 5/6
- Replies: 2
- Views: 233
Sapling 3 Week 5/6
A question on sapling asks,
A heat source generates heat at a rate of 81.0 W (1 W=1 J/s) . How much entropy does this produce per hour in the surroundings at 25.3 ∘C ? Assume the heat transfer is reversible.
How do we start to solve this question?
A heat source generates heat at a rate of 81.0 W (1 W=1 J/s) . How much entropy does this produce per hour in the surroundings at 25.3 ∘C ? Assume the heat transfer is reversible.
How do we start to solve this question?
- Sun Feb 07, 2021 10:54 pm
- Forum: Student Social/Study Group
- Topic: Superbowl Sunday
- Replies: 26
- Views: 1834
Re: Superbowl Sunday
Definitely the Bucc's!!
- Sun Feb 07, 2021 10:54 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: chem community points
- Replies: 7
- Views: 406
Re: chem community points
Yeah including 14A we should have 75 posts by tonight!!
- Sun Feb 07, 2021 10:52 pm
- Forum: Student Social/Study Group
- Topic: Post Midterm 1...
- Replies: 39
- Views: 1988
Re: Post Midterm 1...
I would agree. The UA sessions are super helpful. I didn't do great on this midterm either though so don't worry!!
- Sun Feb 07, 2021 10:50 pm
- Forum: General Science Questions
- Topic: Careless Mistakes
- Replies: 54
- Views: 4107
Re: Careless Mistakes
I can definitely relate to this. I would say just double, triple check your work and try to take your time and go through slowly.
- Sun Feb 07, 2021 10:49 pm
- Forum: General Science Questions
- Topic: Tips
- Replies: 53
- Views: 2653
Re: Tips
I'm struggling too. These topics are pretty hard so thanks for the tips! I'm definitely going to have to get to some step up sessions
- Sun Feb 07, 2021 10:48 pm
- Forum: General Science Questions
- Topic: Study Tips for midterm
- Replies: 24
- Views: 1601
Re: Study Tips for midterm
Going to step up sessions really helped me last quarter!! And also doing the practice problems in the textbook.
- Mon Feb 01, 2021 6:07 pm
- Forum: General Science Questions
- Topic: Careless Mistakes
- Replies: 54
- Views: 4107
Re: Careless Mistakes
Honestly, I do find it tough not to rush through problems but we just have to take our time and analyze the situation!! Double checking my work also helps me
- Mon Feb 01, 2021 6:06 pm
- Forum: General Science Questions
- Topic: Midterm
- Replies: 10
- Views: 443
Midterm
When should we get our midterm grades back?
- Fri Jan 29, 2021 8:58 pm
- Forum: Calculating Work of Expansion
- Topic: week 3/4 hw #13
- Replies: 2
- Views: 174
week 3/4 hw #13
This week's homework on #13 says "At constant pressure, which of these systems do work on the surroundings?", and then gives some chemical formula's. I'm just wondering how are we supposed to tell which systems do work on the surroundings?
- Fri Jan 29, 2021 8:56 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: sapling #11 (week 3/4 assignment)
- Replies: 2
- Views: 139
sapling #11 (week 3/4 assignment)
A hot lump of 30.3 g of aluminum at an initial temperature of 60.3 °C is placed in 50.0 mL H2O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final temperature of the aluminum and water, given that the specific heat of aluminum is 0.903 J/(g·°C)? Assume no heat is lost to...
- Fri Jan 29, 2021 8:50 pm
- Forum: Phase Changes & Related Calculations
- Topic: endothermic/exothermic
- Replies: 43
- Views: 4891
endothermic/exothermic
When there are phase changes, like when something goes from a solid to a liquid, how can we tell if the reaction is endothermic or exothermic?
- Sun Jan 24, 2021 1:40 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Sapling week 2 #8
- Replies: 10
- Views: 638
Sapling week 2 #8
I'm a little confused on this question. It says "H3 is a weak base ( Kb=1.8×10−5 ) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.019 M in NH4Cl at 25 °C?"
Can anyone walk me through how to solve for this problem?
Can anyone walk me through how to solve for this problem?
- Sun Jan 24, 2021 1:38 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Sapling Week 2 #7
- Replies: 6
- Views: 475
Re: Sapling Week 2 #7
I'm still a little confused on #7 as well. After we do this and convert Ka to Kb, what do we do after this step?
- Sat Jan 23, 2021 11:19 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling week 2 #7
- Replies: 2
- Views: 193
Sapling week 2 #7
For this question to get the Kb I did 1.0x10^-14/Ka(given) and then I used the quadratic formula to solve. I'm not sure if I set up the ICE table wrong but my equation came out to x^2/.033-x=2.5x10^-6 but when I solve for x I keep getting the wrong answer. Can anyone explain how they did this questi...
- Sat Jan 23, 2021 11:00 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling week 2 #4
- Replies: 3
- Views: 250
Sapling week 2 #4
Hi so on the week 2 homework on #4, I ended up solving it using the quadratic formula and still got the correct answer eventually. When I solved after the quadratic formula, I got the answer 0.0015. After this though, how do I know which number is the pH and which is pOH? Because after I did -log(1....
- Fri Jan 22, 2021 2:25 pm
- Forum: General Science Questions
- Topic: Lecture Question
- Replies: 4
- Views: 241
Lecture Question
In friday's lecture of week 3, professor talks about the overall (net) enthalpy change. When he does the second example for using method 2, where is he getting the numbers in kJ.mol^-1 for the bonds? He gets the numbers 612 kJ.mol^-1, 366 kJ.mol^-1, -348 kJ.mol^-1, -412 kJ.mol^-1, -276 kJ.mol^-1 and...
- Sun Jan 17, 2021 11:33 am
- Forum: General Science Questions
- Topic: class 1/18/21
- Replies: 13
- Views: 789
class 1/18/21
Will a lecture be posted tomorrow even though we have classes off?
- Sat Jan 16, 2021 4:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: hw question #3
- Replies: 10
- Views: 588
Re: hw question #3
In this question, how did you set up Kc?
- Sat Jan 16, 2021 4:48 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: sapling homework #2
- Replies: 5
- Views: 323
sapling homework #2
At a certain temperature, 0.680 mol SO3 is placed in a 3.50 L container.
2SO3(g)↽−−⇀2SO2(g)+O2(g)
At equilibrium, 0.130 mol O2 is present. Calculate Kc.
I'm pretty confused on how to start this question. Can anyone help?
2SO3(g)↽−−⇀2SO2(g)+O2(g)
At equilibrium, 0.130 mol O2 is present. Calculate Kc.
I'm pretty confused on how to start this question. Can anyone help?
- Sat Jan 16, 2021 4:39 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling Question #4
- Replies: 6
- Views: 329
Re: Sapling Question #4
I'm still a little confused on how the ice box works. So does the change concentration for PCl5 have a negative change in X, and then PCl3 and PCl2 have positive change in X? And then how do you find the initial concentration?
- Mon Jan 11, 2021 1:55 pm
- Forum: General Science Questions
- Topic: Lecture Question [ENDORSED]
- Replies: 5
- Views: 345
Lecture Question [ENDORSED]
In the monday lecture of week 2 in the very first example professor uses, how does he get the change in concentration to be -2X, -X, and +2X?
- Sun Jan 10, 2021 10:12 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Question about 14B Exams
- Replies: 38
- Views: 1636
Re: Question about 14B Exams
thank you for clearing this up!! I wasn't sure how they were structured either
- Sun Jan 10, 2021 10:09 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 32
- Views: 1387
Re: Study Tips
this was super super helpful!! I'm always in need of good study tips so thank you!
- Sun Jan 10, 2021 5:16 pm
- Forum: General Science Questions
- Topic: material
- Replies: 4
- Views: 292
material
Does much of 14A material carry over to 14B?
- Sun Jan 10, 2021 5:15 pm
- Forum: General Science Questions
- Topic: midterm/final
- Replies: 12
- Views: 745
midterm/final
Will the midterm and final format be the same as 14A format with lockdown browser on zoom?
- Wed Jan 06, 2021 1:49 pm
- Forum: General Science Questions
- Topic: step up sessions
- Replies: 16
- Views: 1018
step up sessions
Does anyone know where we find the link for step up/workshop sessions?
- Wed Dec 16, 2020 6:20 pm
- Forum: General Science Questions
- Topic: Tricks for Knowing Locations of Metals and Nonmetals on Periodic Table
- Replies: 8
- Views: 5923
Re: Tricks for Knowing Locations of Metals and Nonmetals on Periodic Table
I struggle with memorizing this too, so thank you for these tips!!
- Wed Dec 16, 2020 6:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 614800
Re: Saying Thank You to Dr. Lavelle
Thank you Dr. Lavelle!!! You make learning chemistry so much fun and you're doing such an amazing job teaching the material. Thanks for a great quarter and excited for the next one with you!!
- Wed Dec 16, 2020 6:13 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3873465
Re: Post All Chemistry Jokes Here
When one physicist asks another, "What's new?" what's the typical response?
C over lamba
C over lamba
- Wed Dec 16, 2020 6:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading scale
- Replies: 29
- Views: 3467
Re: Grading scale
Yeah I think the 50% is just for passing but the rest of the scales for A/A- still apply
- Wed Dec 16, 2020 6:08 pm
- Forum: General Science Questions
- Topic: Passing Grade
- Replies: 34
- Views: 2298
Re: Passing Grade
Yeah I believe a 50% overall on assignments is a passing grade!!
- Wed Dec 16, 2020 6:07 pm
- Forum: General Science Questions
- Topic: final grade
- Replies: 1
- Views: 523
final grade
When should we know final grades?
- Mon Dec 07, 2020 10:03 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: ligand
- Replies: 3
- Views: 196
ligand
why are ligands important/what are they?
- Mon Dec 07, 2020 10:02 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: coordination numbers
- Replies: 2
- Views: 190
coordination numbers
Do we have to draw the lewis structures every time when trying to find coordination numbers?
- Mon Dec 07, 2020 10:01 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: coordination compounds
- Replies: 4
- Views: 231
coordination compounds
Do we need to memorize the prefixes for finding coordination numbers?
- Mon Dec 07, 2020 9:58 am
- Forum: General Science Questions
- Topic: final exam
- Replies: 9
- Views: 1042
final exam
Is the final cummulative?
- Mon Dec 07, 2020 9:57 am
- Forum: General Science Questions
- Topic: 14B enrollment
- Replies: 9
- Views: 1034
14B enrollment
Will what we've learned in 14A carry over a lot into what we will start learning in 14B?
- Sat Nov 28, 2020 4:55 pm
- Forum: Lewis Structures
- Topic: sapling #10
- Replies: 3
- Views: 135
sapling #10
How do I determine the negative pole on molecules?
- Sat Nov 28, 2020 4:49 pm
- Forum: Sigma & Pi Bonds
- Topic: sapling #15
- Replies: 24
- Views: 1253
sapling #15
How do you determine the number of sigma and pi bonds in a molecule given the lewis structure?
- Sat Nov 28, 2020 4:43 pm
- Forum: Hybridization
- Topic: sapling #11
- Replies: 11
- Views: 624
sapling #11
Can someone explain how to find hybridization? I'm pretty confused on this question
- Sat Nov 28, 2020 4:30 pm
- Forum: Lewis Structures
- Topic: determining polarity
- Replies: 5
- Views: 306
determining polarity
Given the lewis structure, how do we find the polarity of the bond and then the overall molecule? For example, H20 and BeCl2
- Sat Nov 28, 2020 4:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: using VSEPR
- Replies: 4
- Views: 192
using VSEPR
When given a 2D representation of a molecule that doesn't necessarily show the 3D shape of the model, how do we use VSEPR to predict the smallest bond angle?
- Sun Nov 22, 2020 8:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polarity from lewis structure
- Replies: 7
- Views: 320
polarity from lewis structure
Given the lewis structure of CO2, is it polar?
- Sun Nov 22, 2020 8:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: linear shape?
- Replies: 5
- Views: 238
linear shape?
How can we determine which molecules are linear given the chemical formula?
- Sun Nov 22, 2020 8:29 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: sapling #4
- Replies: 3
- Views: 214
sapling #4
A question on sapling says
"How many outer atoms and lone pairs are present in a molecule with a square pyramidal shape?"
How are we supposed to determine the lone pairs from this shape?
"How many outer atoms and lone pairs are present in a molecule with a square pyramidal shape?"
How are we supposed to determine the lone pairs from this shape?
- Sun Nov 22, 2020 8:27 pm
- Forum: General Science Questions
- Topic: curve
- Replies: 16
- Views: 1423
curve
Does anyone know if final grades are curved?
- Sun Nov 22, 2020 8:03 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3873465
Re: Post All Chemistry Jokes Here
Why did the white bear dissolve in water?
Because it was polar!
Because it was polar!
- Sun Nov 22, 2020 8:01 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: shape, structure
- Replies: 4
- Views: 189
shape, structure
Will we need to know what the shape of a molecule is from it's name on the final?
- Mon Nov 16, 2020 12:15 pm
- Forum: General Science Questions
- Topic: midterm 2
- Replies: 4
- Views: 217
midterm 2
Will we need to calculate dipole moments on midterm 2?
- Mon Nov 16, 2020 12:13 pm
- Forum: General Science Questions
- Topic: midterm 2
- Replies: 6
- Views: 423
midterm 2
Does midterm 2 have a review session?
- Mon Nov 16, 2020 12:12 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3873465
Re: Post All Chemistry Jokes Here
What's the show cesium and Iodine love watching?
CSI
CSI
- Fri Nov 13, 2020 1:36 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: Sapling #13 (hydrogen bonds)
- Replies: 1
- Views: 177
Sapling #13 (hydrogen bonds)
One of the questions on Sapling says: "Urea is an organic compound widely used as a fertilizer. Its solubility in water allows it to be made into aqueous fertilizer solutions and applied to crops in a spray. What is the maximum theoretical number of water molecules that one urea molecule can hy...
- Fri Nov 13, 2020 1:23 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: Identifying London Dispersion Forces
- Replies: 2
- Views: 224
Identifying London Dispersion Forces
When given molecules, how do I tell which ones only exhibit London Forces?
- Fri Nov 13, 2020 1:13 pm
- Forum: Resonance Structures
- Topic: Oxidation numbers
- Replies: 5
- Views: 207
Oxidation numbers
How can we tell what the oxidation number is when given a resonance structure? Why are oxidation numbers important?
- Sun Nov 08, 2020 8:08 pm
- Forum: Bond Lengths & Energies
- Topic: Bond length
- Replies: 11
- Views: 336
Bond length
When it comes to bond length, is a single bond shorter than a triple bond? I'm kind of confused on how to order lengths of bonds.
- Sun Nov 08, 2020 8:06 pm
- Forum: Resonance Structures
- Topic: Formal charge on different resonance structures
- Replies: 3
- Views: 183
Formal charge on different resonance structures
When given different resonance structures, how does formal charge tell us which structure is most plausible?
- Sun Nov 08, 2020 8:03 pm
- Forum: Lewis Acids & Bases
- Topic: Acid vs. Base
- Replies: 8
- Views: 483
Acid vs. Base
How are we supposed to tell if a molecule is an acid or a base? I know that if it donates electrons then it's a base and if it accepts electrons then it's an acid but is there a more in depth explanation?
- Thu Nov 05, 2020 6:27 pm
- Forum: General Science Questions
- Topic: Sapling HW question
- Replies: 6
- Views: 902
Sapling HW question
There is a question on sapling that says: "The formulas of the bromate ion, BrO−3, and chlorate ion, ClO−3, are very similar. However, the formulas of the nitrate ion and phosphate ion contain different numbers of oxygen atoms. This is also true for the formulas of the nitrite ion and phosphite...
- Wed Nov 04, 2020 2:36 pm
- Forum: Lewis Acids & Bases
- Topic: Octet question
- Replies: 7
- Views: 471
Octet question
When drawing Lewis structures, how can we tell if it's okay that a molecule doesn't have an octet? For example, Boron on BF3 (lecture example)? How do we know that it's correct if Boron doesn't form an octet?
- Fri Oct 30, 2020 2:51 pm
- Forum: Trends in The Periodic Table
- Topic: Trends
- Replies: 14
- Views: 1178
Trends
Can someone explain how the sizes of the atomic/ionic radius works? I'm struggling with remembering how big/small a radius is according to where the element is on the periodic table.
- Fri Oct 30, 2020 2:48 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Vs. Covalent
- Replies: 7
- Views: 454
Ionic Vs. Covalent
Can someone explain the main difference between ionic and covalent bonds?
- Fri Oct 30, 2020 2:46 pm
- Forum: Octet Exceptions
- Topic: Octet Exceptions
- Replies: 10
- Views: 595
Re: Octet Exceptions
Are these the only exceptions to the rule in the whole periodic table? Not just the ones we will be working with?
- Fri Oct 30, 2020 2:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Participation Points [ENDORSED]
- Replies: 62
- Views: 4288
Re: Participation Points [ENDORSED]
Thank you for this clarification!! I was wondering the same thing. Just to be sure, any post counts as points for that week correct?
- Fri Oct 30, 2020 2:30 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers Question
- Replies: 2
- Views: 232
Quantum Numbers Question
How do we tell how many quantum numbers specifies a subshell?
- Fri Oct 30, 2020 12:45 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3873465
Re: Post All Chemistry Jokes Here
What is a cation afraid of?
A dogion
A dogion
- Sun Oct 25, 2020 10:58 pm
- Forum: *Shrodinger Equation
- Topic: Schrodinger on MT
- Replies: 7
- Views: 468
Re: Schrodinger on MT
I've mostly heard that Schrodinger on the MT will be more conceptual from UA's and TA's!!
- Sun Oct 25, 2020 12:33 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1B.5A
- Replies: 1
- Views: 104
1B.5A
I'm pretty confused still on the uncertainty problems. Can someone explain how to start this problem?
A proton is accelerated in a cyclotron to a very high speed that is known to within 3.0 × 10^2 km⋅s^−1. What is the minimum uncertainty in its position?
A proton is accelerated in a cyclotron to a very high speed that is known to within 3.0 × 10^2 km⋅s^−1. What is the minimum uncertainty in its position?
- Sun Oct 25, 2020 11:50 am
- Forum: Properties of Light
- Topic: Emission/Absorption
- Replies: 6
- Views: 309
Re: Emission/Absorption
Thank you guys this helped a ton!!
- Sat Oct 24, 2020 5:54 pm
- Forum: Photoelectric Effect
- Topic: Textbook 1B.3A problem
- Replies: 2
- Views: 439
Textbook 1B.3A problem
Hi, there is a problem from the textbook that says
"The work function of zinc is 3.63 eV. What is the longest wavelength of electromagnetic radiation that could eject electrons from zinc?"
Can anyone walk me through how to start this problem?
"The work function of zinc is 3.63 eV. What is the longest wavelength of electromagnetic radiation that could eject electrons from zinc?"
Can anyone walk me through how to start this problem?