Search found 118 matches
- Sat Mar 14, 2020 5:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading Scale
- Replies: 16
- Views: 1029
Re: Grading Scale
He doesn't always necessarily have to curve the class so I think if everyone does well there will be no curve.
- Sat Mar 14, 2020 5:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Submission
- Replies: 8
- Views: 731
Re: Final Submission
I think the final will be posted as an online quiz on ccle so I think you just hit submit after your done.
- Sat Mar 14, 2020 5:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Partial Credit?
- Replies: 3
- Views: 283
Re: Final Partial Credit?
I think there will be no partial credit given because it is multiple choice/ fill in the blank and they can't really assess our work. This means we have to be extra careful when working through these problems to make sure we make no mistakes.
- Sat Mar 14, 2020 5:16 pm
- Forum: General Science Questions
- Topic: Who makes the Final
- Replies: 23
- Views: 1356
Re: Who makes the Final
I think Lavelle makes the final and the midterm but I think the TA makes the tests because our TA in discussion mentioned once that each TA writes one question on the tests.
- Sat Mar 14, 2020 5:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: take home FINAL DEADLINE
- Replies: 15
- Views: 1050
Re: take home FINAL DEADLINE
He just sent out an email saying that we actually have 3 and a half hours to do it (11:15 - 2:45).
- Sat Mar 14, 2020 5:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Online Final
- Replies: 3
- Views: 308
Re: Online Final
I think it's either multiple choice or fill in the answer but I don't think any work will have to be shown.
- Sat Mar 14, 2020 5:14 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Where to find the final exam
- Replies: 5
- Views: 385
Re: Where to find the final exam
There should be a folder on the left label "FINAL" tomorrow. It opens up 11:15 and closes 2:45.
- Sun Mar 08, 2020 11:14 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Problems
- Replies: 6
- Views: 466
Re: Problems
If you are talking about kinetics and thermodynamics, I would think that he would specify which one to consider as they both represent separate things.
- Sun Mar 08, 2020 11:12 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Study Advice
- Replies: 73
- Views: 6747
Re: Study Advice
The best way to study in my opinion is to do all the homework problems. In regards to review sessions, I would go to the final review sessions only for the topics that you need. I would also go to Lyndon's workshop on Monday because he goes through the topics in depth and give good practice problems.
- Sun Mar 08, 2020 11:06 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Test 2
- Replies: 7
- Views: 517
Re: Test 2
The one with the lower cell potential represents the oxidation half reaction and the one with the higher cell potential represents the reduction half reaction.
- Sun Mar 08, 2020 11:02 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Application
- Replies: 6
- Views: 461
Re: Application
The three equations for delta G.
delta G= -nFE
delta G= -RTlnK
delta G= delta H - T*delta S
You can delta the top two delta G's together.
You can also set the second equation equal to the third equation and solving for the Vant Hoff Equation.
delta G= -nFE
delta G= -RTlnK
delta G= delta H - T*delta S
You can delta the top two delta G's together.
You can also set the second equation equal to the third equation and solving for the Vant Hoff Equation.
- Sun Mar 08, 2020 10:55 pm
- Forum: Van't Hoff Equation
- Topic: deriving
- Replies: 3
- Views: 352
Re: deriving
I would still know how to derive each of the equations as it might show up on the final.
- Sun Mar 08, 2020 10:54 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L.3
- Replies: 4
- Views: 340
Re: 6L.3
I remember being confused on this problem too. What I ended up doing was looking at the reduction half reactions table at Appendix 2A and going from there. I looked at the equations and found which one had O2 and H+ in one equation and O2 and OH- in another equation and manipulated to to result in t...
- Sun Mar 01, 2020 5:24 pm
- Forum: General Science Questions
- Topic: Studying
- Replies: 67
- Views: 3510
Re: Studying
What I usually do is take notes on the textbook, go through the notes from lecture, and then do all the homework problems. I also do the worksheets that my TA gives me over again.
- Sun Mar 01, 2020 5:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test 2
- Replies: 15
- Views: 859
Re: Test 2
Test 2 is the last half of outline 4 and all of outline 5.
- Sun Mar 01, 2020 5:19 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Flipping the sign
- Replies: 10
- Views: 580
Re: Flipping the sign
in appendix 2B, the reduction values are given, so when you need oxidation values, you have to flip the sign, but rather than E cell= E cathode- E anode, it would be E cell= E cathode + E anode.
- Sun Mar 01, 2020 5:17 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell potential
- Replies: 15
- Views: 770
Re: cell potential
If the E cell value is positive, the delta G is negative, and K is greater than one. If the E cell value is negative, the delta G is positive, and K is less than one.
- Sun Mar 01, 2020 5:15 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Where to find Ecell values
- Replies: 15
- Views: 821
Re: Where to find Ecell values
Appendix 2B but make sure that to manipulate the values when the reaction is flipped.
- Sun Mar 01, 2020 5:11 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: spontaneity
- Replies: 39
- Views: 1822
Re: spontaneity
Gibbs free energy is the best and most accurate way to tell whether a reaction is spontaneous, but using the equation delta G= delta H- T*delta S, it is possible to see what values of delta H and delta S gives a a negative delta G value.
- Sun Feb 23, 2020 4:12 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing/Reducing Agents
- Replies: 11
- Views: 780
Re: Oxidizing/Reducing Agents
In most reactions, something gets oxidized and reduced. When the product of a reaction gets reduced, the reactant is the oxidizing agent. If the product of a reaction is oxidized, then the reactant is the reducing agent.
- Sun Feb 23, 2020 4:07 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: voltage
- Replies: 8
- Views: 376
Re: voltage
Voltage is what drives current and it is the result of the potential difference between two electrodes.
- Sun Feb 23, 2020 4:05 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: electrode
- Replies: 4
- Views: 376
Re: electrode
An electrode is a conductor in which electricity is able to travel through. In this way, electricity is able to be transferred from one place to another.
- Sun Feb 23, 2020 4:00 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Enthalpy
- Replies: 26
- Views: 1084
Re: Enthalpy
A state function is a property that states that the path that something takes is irrelevant, the only thing that matters is the final result or final state. d
- Sun Feb 23, 2020 3:50 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous
- Replies: 23
- Views: 1131
Re: Spontaneous
if delta G is less than 0, that means the reaction is spontaneous. You can also think of spontaneity in terms of the equation delta G= delta H - T*Delta S in order to assess which values of delta H and delta S can produce a spontaneous reaction with a negative delta G.
- Sun Feb 16, 2020 11:14 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: spontaneity
- Replies: 39
- Views: 1822
Re: spontaneity
Delta G is the greatest determiner of whether a reaction will be spontaneous or not. If delta G is negative, then the reaction is spontaneous. You could also use the equation DeltaG= DeltaH- T*DeltaS, given either DeltaH or DeltaS, to see what values need to be in order to produce a spontaneous reac...
- Sun Feb 16, 2020 11:12 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: adiabatic
- Replies: 19
- Views: 982
Re: adiabatic
An adiabatic reaction is when theres no heat being released or transferred into or from the system. Usually in these cases, q=0 and delta U = w
- Sun Feb 16, 2020 11:11 am
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: memorize
- Replies: 14
- Views: 763
Re: memorize
We were given the entropy values on the midterm so I'm assuming the same will happen for the rest of the tests from here on out.
- Sun Feb 16, 2020 11:10 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm Curve
- Replies: 45
- Views: 2126
Re: Midterm Curve
I really hopes he curves the midterm because it was more difficult than expected. However, I wouldn't put too much hope in that because he also could easily not curve the midterm.
- Sun Feb 16, 2020 11:07 am
- Forum: General Science Questions
- Topic: 50 post grade
- Replies: 25
- Views: 1735
Re: 50 post grade
I think it depends on your TA. Some TAs check at the very end of the 10 weeks while some check every week by Sunday night. My TA last quarter checked at the very end.
- Sun Feb 16, 2020 11:05 am
- Forum: Student Social/Study Group
- Topic: Preparing for Exam Content
- Replies: 7
- Views: 578
Re: Preparing for Exam Content
I completely agree. This test was much harder than expected. I personally felt very prepared for the midterm. I did all the practice and went through them almost three times and attended the review session. Even then, I thought the test was definitely tricker than expected. I think the best way to a...
- Sun Feb 09, 2020 10:02 pm
- Forum: General Science Questions
- Topic: Midterm Review Questions ?
- Replies: 3
- Views: 260
Re: Midterm Review Questions ?
I think the best problems are the ones at the very end (chapter exercises). They combine all the topics together really well and they are typically much harder so I think if you can do these, you're pretty prepared.
- Sun Feb 09, 2020 9:59 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Pizza Rolls 5a
- Replies: 4
- Views: 238
Re: Pizza Rolls 5a
There are three parts of to this problem. First you would have to find the change in enthalpy from the He volume change, the change in enthalpy from the Krypton volume change, and then the change in entropy from the temperature change. You would add all these entropies together to get the total.
- Sun Feb 09, 2020 9:56 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Midterm Material
- Replies: 10
- Views: 490
Re: Midterm Material
I would briefly look over it but in my opinion, I don't think he would put very difficult questions on that because we just went over it on the last day for like 20 minutes.
- Sun Feb 09, 2020 9:55 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: equations
- Replies: 4
- Views: 142
Re: equations
I usually look at what they're asking me to find, write down all the equations we know that relate it, and see which equation to use based off the information given to me in the problem.
- Sun Feb 09, 2020 9:51 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE BOX Reverse ?
- Replies: 4
- Views: 348
Re: ICE BOX Reverse ?
Usually, it should give you the concentration of the reactant or some way to calculate the concentration. If not, I don't think it would be possible to assume there is a concentration when it doesn't explicitly say it in the problem so I am assuming you just put zero but not too sure.
- Sun Feb 09, 2020 9:50 pm
- Forum: Calculating Work of Expansion
- Topic: Vacuum
- Replies: 3
- Views: 103
Re: Vacuum
Also it might say something like the reaction is a free expansion in which case it would have the same effect as a reaction occurring in a vacuum.
- Sun Feb 02, 2020 9:09 pm
- Forum: Ideal Gases
- Topic: PV=nRT
- Replies: 74
- Views: 4207
Re: PV=nRT
P= pressure, V=volume, n=moles, R=gas constant, T=temperature
- Sun Feb 02, 2020 9:06 pm
- Forum: Properties of Light
- Topic: Photons
- Replies: 3
- Views: 356
Re: Photons
According to the internet, a photon is the only thing the human eye can see.
- Sun Feb 02, 2020 9:04 pm
- Forum: Student Social/Study Group
- Topic: Midterm study
- Replies: 8
- Views: 432
Re: Midterm study
I recommend only going to the review sessions for the topics you need help on. Also definitely do the homework problems because 1 out 8 of the midterm questions will come from the homework problems.
- Sun Feb 02, 2020 8:52 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Three Methods
- Replies: 3
- Views: 170
Re: Three Methods
If there are multiple equations, you should Hess's Law. If bond enthalpies are given, use the method where you calculate each of the broken bonds. If they give you enthalpies for the each of the products and reactants, use the method where you subtract the sum of reactant enthalpies from those of th...
- Sun Feb 02, 2020 8:41 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 4
- Views: 264
Re: Hess's Law
I first try to reorganize the equations so that they can cancel out, meaning that I put all the products on the product side and all the reactants on the reactant side. Then I see if the equations need to be multiplied by a coefficient. Then I apply the same actions to the delta Hs of each equation.
- Sat Jan 25, 2020 6:33 pm
- Forum: Ideal Gases
- Topic: final exam pickup
- Replies: 10
- Views: 448
Re: final exam pickup
he posted an email saying our finals were ready for pickup on Friday. However, there was some talk about how if it wasn't picked up on that day, they would be disposed of, although I'm not too sure how true that is.
- Sat Jan 25, 2020 6:31 pm
- Forum: Ideal Gases
- Topic: aqueous elements in eq calculation
- Replies: 8
- Views: 331
Re: aqueous elements in eq calculation
There are four main "states": solid, liquid, gas, and aqueous. In the equilibrium equation, you would include the gases and aqueous solutions, but you would exclude solids and liquids.
- Sat Jan 25, 2020 6:27 pm
- Forum: General Science Questions
- Topic: Extra Credit
- Replies: 19
- Views: 734
Re: Extra Credit
I don't think there are any extra credit opportunities for 14 A or 14 B unfortunately :(
- Sat Jan 25, 2020 6:27 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic and Exothermic
- Replies: 13
- Views: 511
Re: Endothermic and Exothermic
Endothermic reactions require heat in chemical reactions and delta H is positive whereas exothermic reactions release heat in chemical reaction and delta H is negative.
- Sat Jan 25, 2020 6:23 pm
- Forum: Phase Changes & Related Calculations
- Topic: Entropy vs Enthalpy
- Replies: 9
- Views: 165
Re: Entropy vs Enthalpy
enthalpy is the amount of heat that is released or absorbed in a reaction whereas entropy is the degree of disorder. Generally, it takes energy to go from more disordered to less disordered, and energy is released when you go from less disorder to more disorder. Enthalpy and entropy are related in t...
- Sat Jan 25, 2020 6:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Partial Pressure vs. Concentration
- Replies: 5
- Views: 144
Re: Partial Pressure vs. Concentration
When they tell you to use partial pressures, you have to use the given information and plug into PV=nRT to find bars/atmospheres. When it's partial concentration, then you would just find moles over liters.
- Sun Jan 19, 2020 5:40 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Identifying endothermic vs exothermic
- Replies: 7
- Views: 257
Re: Identifying endothermic vs exothermic
When delta H is negative, it's exothermic and when delta H is positive, the reaction is endothermic.
- Sun Jan 19, 2020 5:37 pm
- Forum: Ideal Gases
- Topic: Topics on Test 1
- Replies: 37
- Views: 1242
Re: Topics on Test 1
All of outline 1 and outline 2 will be on this test, which includes ICE table, Ka, Kb, and Le Chatlier's. The best way to study is to do the outline problems.
- Sun Jan 19, 2020 5:35 pm
- Forum: Ideal Gases
- Topic: concentration
- Replies: 5
- Views: 160
Re: concentration
You can use PV=nRT given moles and volume and you solve for P.
- Sun Jan 19, 2020 5:34 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE tables
- Replies: 3
- Views: 181
Re: ICE tables
We use ICE tables when a system was disturbed and you want to find the new equilibrium concentrations given the Kc.
- Sun Jan 19, 2020 5:31 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: pH vs. pOH
- Replies: 13
- Views: 380
Re: pH vs. pOH
You know whether you are calculating for a base or for an acid based on whether there is OH being produced or H3O+.
- Sat Jan 11, 2020 1:27 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 19
- Views: 1609
Re: Le Chatelier's Principle
You use the Chatlier's Principle any time a reaction at equilibrium is disturbed. This includes when concentrations of either reactants are products are increased or decrease, when pressure is increased or decreased, and when temperature is increased or decreased.
- Sat Jan 11, 2020 1:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Q
- Replies: 10
- Views: 504
Re: K vs. Q
K is the fixed equilibrium constant value for a certain reaction. Q is the reaction quotient and is used when it is certain that the reaction is not at equilibrium yet. For example, if you add more products, the reaction will not be at equilibrium the moment you add more products, so you would calcu...
- Sat Jan 11, 2020 1:23 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Tables
- Replies: 5
- Views: 173
Re: ICE Tables
ICE table only involve gases and aqueous substances. We assume the the concentrations of solids and liquids are 1.
- Sat Jan 11, 2020 1:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Change in k
- Replies: 11
- Views: 494
Re: Change in k
K is the equilibrium constant. The keyword there is constant meaning that for a certain reaction, no matter how much the initial concentration, the K value will always be the same for that reaction.
- Sat Jan 11, 2020 1:18 pm
- Forum: Ideal Gases
- Topic: Topics on Test 1
- Replies: 37
- Views: 1242
Re: Topics on Test 1
I think it will be things from both outline one and outline two since we covered the main ideas from outline one this week.
- Sun Dec 08, 2019 11:44 pm
- Forum: Conjugate Acids & Bases
- Topic: Neutralization Equations
- Replies: 3
- Views: 407
Re: Neutralization Equations
A neutralization reaction involves a strong acid and strong base and produces a salt and water. Both the salt and water are neutral.
- Sun Dec 08, 2019 11:41 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Final question
- Replies: 1
- Views: 246
Re: Final question
I think it was for BeO and Al2O3. These are amphoteric oxides. That's just something you know or don't because it's hard to determine that.
- Sun Dec 08, 2019 11:38 pm
- Forum: Hybridization
- Topic: Identifying Hybrid Orbitals
- Replies: 5
- Views: 437
Re: Identifying Hybrid Orbitals
I think all atoms in a molecule have hybrid orbitals and this is determined by the number of regions of electron densities there are.
- Sun Dec 08, 2019 11:37 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: H3O+
- Replies: 12
- Views: 26099
Re: H3O+
H3O+ is a tetrahedral molecule and has bond angle of 120
- Sun Dec 08, 2019 11:35 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty
- Replies: 7
- Views: 838
Re: Uncertainty
yes, they are the same thing and can be used interchangeably.
- Sun Dec 08, 2019 11:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: bent v. angular
- Replies: 27
- Views: 1419
Re: bent v. angular
Bent and angular are the same thing and produce the same shape. However, be careful of the bond angles because are two different bond angles depending on how many electron density fields there are.
- Sun Dec 08, 2019 11:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final tips
- Replies: 19
- Views: 997
Re: Final tips
I think what helped me most for the final was doing all the textbook problems and readings as well as really understanding the lecture notes.
- Sun Dec 08, 2019 11:26 pm
- Forum: Biological Examples
- Topic: Cisplatin [ENDORSED]
- Replies: 19
- Views: 1244
Re: Cisplatin [ENDORSED]
he just said that it affects normal healthy cells and either damages them or stops the replication fo them.
- Sun Dec 08, 2019 11:25 pm
- Forum: General Science Questions
- Topic: Curve
- Replies: 9
- Views: 881
Re: Curve
I think that the grades get curved after inputing the final and assessing the final grade. Also, I have heard that he doesn't necessarily always curve the class, for example if everyone does well on the final.
Re: "Ferrate"
Ferrate is used when the overall complex has a negative charge and there is Iron in the complex. the same concept works for copper and cupperate.
- Sun Dec 08, 2019 11:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: curve
- Replies: 8
- Views: 611
Re: curve
He supposedly curves after he determines final grades but he also doesn't necessarily always curve.
- Sun Dec 08, 2019 11:19 pm
- Forum: Air Pollution & Acid Rain
- Topic: Final Exam
- Replies: 5
- Views: 743
Re: Final Exam
I think we were just supposed to know the formulas for acid rain. There are two formulas invovlving SO3 and CO3 but both didn't end up showing up on the test.
- Sun Dec 08, 2019 11:15 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: common acids and bases
- Replies: 4
- Views: 255
Re: common acids and bases
Strong Acids: HCl, HI, HBr, H2SO4, HClO4, HNO3
Strong Bases: NaOH, KOH, LiOH, Ca(OH)2, Sr(OH)2, Ba(OH)2
Strong Bases: NaOH, KOH, LiOH, Ca(OH)2, Sr(OH)2, Ba(OH)2
- Sun Dec 08, 2019 11:13 pm
- Forum: Student Social/Study Group
- Topic: heme complex
- Replies: 5
- Views: 615
Re: heme complex
I'm pretty sure the heme complex has 4 ligands that are composed of N atoms.
- Sun Dec 08, 2019 11:12 pm
- Forum: Student Social/Study Group
- Topic: most stable
- Replies: 6
- Views: 562
Re: most stable
That is not necessarily true. The most stable lewis structure is when the formal charge is 0 with all the atoms in the molecules.
- Sun Dec 08, 2019 11:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final
- Replies: 1
- Views: 188
Re: final
yes carbon monoxide can bind to the heme complex the same way CN- binds to the heme complex
- Mon Dec 02, 2019 12:23 am
- Forum: Bronsted Acids & Bases
- Topic: Final
- Replies: 13
- Views: 784
Re: Final
its cumulative so it's all the main topics from the beginning of the year
- Mon Dec 02, 2019 12:22 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-shape
- Replies: 21
- Views: 1596
Re: T-shape
t shapes have two lone pairs and 3 bondes pairs
- Mon Dec 02, 2019 12:22 am
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Strength
- Replies: 4
- Views: 248
Re: Strength
a strong base produces more oh ions
- Mon Dec 02, 2019 12:21 am
- Forum: Sigma & Pi Bonds
- Topic: Sigma vs. Pi
- Replies: 20
- Views: 1174
Re: Sigma vs. Pi
sigma bonds would be stronger
- Mon Dec 02, 2019 12:20 am
- Forum: Administrative Questions and Class Announcements
- Topic: Monday's Lecture
- Replies: 2
- Views: 215
Re: Monday's Lecture
he will be continuing from where he left off
- Sun Nov 24, 2019 5:08 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 16
- Views: 985
Re: Electronegativity
The greater the electronegativity difference between the elements, the stronger the bond and therefore the shorter the bond length.
- Sun Nov 24, 2019 4:57 pm
- Forum: Student Social/Study Group
- Topic: Test 2 and Final
- Replies: 18
- Views: 858
Re: Test 2 and Final
We will get test 2 back during the discussion of week 10. The final is cumulative, so it covers everything from week 1.
- Sun Nov 24, 2019 4:55 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: pi and sigma bonds
- Replies: 4
- Views: 318
Re: pi and sigma bonds
Sigma bonds overlap horizontally while pi bonds overlap vertically.
- Sun Nov 24, 2019 4:52 pm
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 13
- Views: 650
Re: Sigma and Pi bonds
Nothing actually changes when you draw the lewis structures. You just have to acknowledge that if there's more than one bond, than one of them is sigma and the rest are pi.
- Sun Nov 24, 2019 4:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 14
- Views: 685
Re: Test 2
In regards to studying intermolecular forces, I would say the best way is to read the chapter in the book about them and then do practice problems.
- Sun Nov 17, 2019 11:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance and VSEPR
- Replies: 9
- Views: 535
Re: Resonance and VSEPR
No they are not considered because double bonds and triple bonds are not visually represented in vsper models.
- Sun Nov 17, 2019 11:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing molecules
- Replies: 12
- Views: 657
Re: Drawing molecules
We would only need to draw the lewis structures, not the 3D model.
- Sun Nov 17, 2019 11:28 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 58
- Views: 4295
Re: Study Tips
For the upcoming tests, a good way to memorize all the shapes, angles, and generla information would be to make a chart or study the pre-made charts that already exist on google.
- Sun Nov 17, 2019 11:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shapes
- Replies: 5
- Views: 267
Re: Shapes
He spoke on this topic in my lecture when a student asked this question. He said to look at the individual molecules around it and determine each of their shape, and from there to arrange them.
- Sun Nov 17, 2019 11:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trans vs Cis molecules
- Replies: 2
- Views: 93
Re: Trans vs Cis molecules
In regards to the specific molecule that he talked about during lecture, the trans molecule was when the r group was on opposite sides of the molecule and the cis molecule was when the r group was on the same side of the molecule. In addition, the trans isomer is non-polar while the cis isomer is po...
- Mon Nov 11, 2019 8:24 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Test Policy
- Replies: 6
- Views: 439
Re: Test Policy
I think it's fine to just put the number next to the atom. That's what a lot of the TAs did too during review sessions are office hours.
- Mon Nov 11, 2019 8:22 pm
- Forum: Student Social/Study Group
- Topic: Chem 14B
- Replies: 10
- Views: 687
Re: Chem 14B
Like everyone said, I think it's easier to take it after taking 14b because you already know the material so you will have a better idea of what you are going into.
- Mon Nov 11, 2019 8:21 pm
- Forum: Resonance Structures
- Topic: What is a Resonance "Structure"
- Replies: 12
- Views: 965
Re: What is a Resonance "Structure"
Resonance structures are all the possible lewis structures a molecule can have given its in the same position. In a resonance structure, all the bonds are the same length.
- Mon Nov 11, 2019 8:19 pm
- Forum: Octet Exceptions
- Topic: Limit to expanded octet
- Replies: 7
- Views: 766
Re: Limit to expanded octet
The limit would have to do with number of electrons an entire molecule can have and the formal charges.
- Mon Nov 11, 2019 8:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: Exam 2 & Homework
- Replies: 5
- Views: 293
Re: Exam 2 & Homework
We are allowed to turn in homework from chemical bonds I'm pretty sure and I think test two is week 8.
- Sun Nov 03, 2019 8:50 pm
- Forum: *Black Body Radiation
- Topic: Midterm
- Replies: 14
- Views: 656
Re: Midterm
It is not going to be on the midterm.
- Sun Nov 03, 2019 8:48 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity Problem
- Replies: 1
- Views: 104
Re: Electron Affinity Problem
The reason that Ne doesn't have higher electron affinity is because Ne already has 8 valance electrons so it doesn't want more electrons. I think the only exception is with the noble gases.
- Sun Nov 03, 2019 8:42 pm
- Forum: Lewis Structures
- Topic: Lewis Structure
- Replies: 3
- Views: 191
- Sun Nov 03, 2019 8:37 pm
- Forum: Resonance Structures
- Topic: Do we always need to draw resonance?
- Replies: 1
- Views: 107
Re: Do we always need to draw resonance?
Only if the lewis structure can have multiple ways to draw it, then you need to draw resonance.
- Sun Nov 03, 2019 8:36 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 1
- Views: 153
Re: Resonance Structures
If there are multiple ways to draw the same lewis structure with all the atoms in the same position, then the molecule has resonance structures.
- Sun Nov 03, 2019 8:31 pm
- Forum: DeBroglie Equation
- Topic: Dino Nuggets Problem 6a
- Replies: 2
- Views: 328
Re: Dino Nuggets Problem 6a
I would go back through your calculations and make sure that your units are what they are supposed to be. For example, make sure you're converting grams to kilograms since some of the units are in kg. Also make sure you are finding unit per atom when they give it to you in unit per mole.
- Sun Nov 03, 2019 8:28 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Electromagnetic radiation
- Replies: 1
- Views: 90
Re: Electromagnetic radiation
When electromagnetic radiation is emitted from the photon, the energy is released from that photon so the energy of the photon is decreased.