Search found 131 matches
- Sat Mar 13, 2021 10:12 pm
- Forum: Zero Order Reactions
- Topic: zero order
- Replies: 47
- Views: 1955
Re: zero order
A zero order reaction has a rate that is independent of the concentration of a reactant
- Sat Mar 13, 2021 10:11 pm
- Forum: Student Social/Study Group
- Topic: Spring Quarter
- Replies: 60
- Views: 3497
Re: Spring Quarter
I am taking Chem 14C and wanted to get into BL but couldn'.
- Sat Mar 13, 2021 10:11 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Value of N
- Replies: 24
- Views: 1191
Re: Value of N
n is the number of electrons transferred once the equations are balanced.
- Sat Mar 13, 2021 10:10 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Sapling 17
- Replies: 7
- Views: 648
Re: Sapling 17
The activation energy of the reverse reaction is the activation energy of the forward, plus delta H
- Sat Mar 13, 2021 10:09 pm
- Forum: Student Social/Study Group
- Topic: Left/Right Electrode
- Replies: 9
- Views: 669
Re: Left/Right Electrode
On the right will be the reduction (cathode) and on the right will be the oxidation (anode)
- Sat Mar 13, 2021 10:08 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem community points
- Replies: 19
- Views: 1454
Re: Chem community points
They are due Sunday as per Dr. Lavelle's email
- Sat Mar 13, 2021 10:06 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts
- Replies: 6
- Views: 478
Re: Catalysts
Yes this is true. You do include catalysts in the rate law for the steps but the catalyst will not show up in the overall reaction, so will not be included in the overall rate law.
- Sat Mar 13, 2021 10:04 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Determining slow step
- Replies: 5
- Views: 479
Re: Determining slow step
I think if we were given it on the test they would have to tell you which is the slow step. If that is not the case then, if you know the overall rate law, you can find the rate law for each step in the mechanism and determine which is the slow step because it will match the overall. Sometimes we ar...
- Sat Mar 13, 2021 10:02 pm
- Forum: First Order Reactions
- Topic: Half Life Unit
- Replies: 38
- Views: 1632
Re: Half Life Unit
The calculations are usually in seconds but can easily be converted and should always tell you the unit if used in a question
- Sat Mar 13, 2021 10:01 pm
- Forum: Student Social/Study Group
- Topic: Sapling good to review for final?
- Replies: 16
- Views: 961
Re: Sapling good to review for final?
I think the sapling questions are great to refresh on concepts and remember the particulars for how to solve problems
- Wed Mar 10, 2021 5:56 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Understanding Kinetics
- Replies: 10
- Views: 567
Re: Understanding Kinetics
The equations are all specific to the order of the reaction. Once you know the order, you can use those equations to figure out anything you need to solve for
- Wed Mar 10, 2021 5:54 pm
- Forum: General Rate Laws
- Topic: intermediates in rate laws
- Replies: 5
- Views: 259
Re: intermediates in rate laws
I do not believe you would include intermediates in the rate law in any case.
- Wed Mar 10, 2021 5:52 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode always on left in cell diagram?
- Replies: 6
- Views: 496
Re: Anode always on left in cell diagram?
I agree, I think it would be a typo because the convention is to always put the anode on the left side
- Wed Mar 10, 2021 5:51 pm
- Forum: General Rate Laws
- Topic: Rate Equation Order (Exponent)
- Replies: 3
- Views: 285
Re: Rate Equation Order (Exponent)
An elementary reaction is a chemical reaction in which one or more species reacts directly to form products in a single reaction step with a single transition state. -If a reaction is elementary, the rate will be proportional to the concentrations of the reactants -Elementary reactions do not have a...
- Wed Mar 10, 2021 5:46 pm
- Forum: Environment, Ozone, CFCs
- Topic: catalysis vs intermediate
- Replies: 25
- Views: 2025
Re: catalysis vs intermediate
A catalyst is a species that is consumed and then produced
An intermediate is a species that is produced and then consumed
You would include the catalyst in the rate law but you would not include an intermediate
An intermediate is a species that is produced and then consumed
You would include the catalyst in the rate law but you would not include an intermediate
- Wed Mar 10, 2021 5:45 pm
- Forum: Zero Order Reactions
- Topic: zero order
- Replies: 47
- Views: 1955
Re: zero order
Zero order means that the reaction rate does not depend on the concentration of the reactants
First order means that the reaction rate depends on the concentration of one reactant
Second order means that the reaction rate depends on the concentration of 2 reactants
First order means that the reaction rate depends on the concentration of one reactant
Second order means that the reaction rate depends on the concentration of 2 reactants
- Wed Mar 10, 2021 5:43 pm
- Forum: General Science Questions
- Topic: Pre-Law/Pre-Med Students
- Replies: 20
- Views: 1551
Re: Pre-Law/Pre-Med Students
I am pre-dent and have found the majority of the required classes are very manageable if you know how to study and distribute your time
- Wed Mar 10, 2021 5:42 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3641761
Re: Post All Chemistry Jokes Here
Did you know that you can cool yourself to -273.15˚C and still be 0k?
- Wed Mar 10, 2021 5:41 pm
- Forum: Balancing Redox Reactions
- Topic: 6L.7
- Replies: 1
- Views: 151
Re: 6L.7
I also was confused on how to go about splitting up the reaction for this question
- Wed Mar 10, 2021 5:36 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: nernst equation
- Replies: 20
- Views: 851
Re: nernst equation
When you do the half reactions, the number of moles is the number of electrons transferred in the equation
- Wed Mar 10, 2021 5:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: The Final
- Replies: 17
- Views: 882
Re: The Final
I think it will be based on the amount of time we covered each topic but I also think that there will be a significant amount of questions from after midterm 2 specifically
- Wed Mar 10, 2021 5:34 pm
- Forum: Balancing Redox Reactions
- Topic: E at equilibrium
- Replies: 7
- Views: 641
Re: E at equilibrium
at equilibrium Delta E is equal to 0 since the reaction quotient isn't changing
- Wed Mar 10, 2021 5:33 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: EA
- Replies: 23
- Views: 1331
Re: EA
I agree^^ I think you can interpret them the same but usually the A is at least written as a subscript for Activation Energy , if not also lowercase
- Wed Mar 10, 2021 4:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: [TA Review] Kinetics-Wilberth
- Replies: 3
- Views: 744
Re: [TA Review] Kinetics-Wilberth
Wilberth is the best!!!!
- Wed Mar 10, 2021 4:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L.5 d
- Replies: 1
- Views: 159
Re: 6L.5 d
My TA went over this problem in class so hopefully I can help. For the cathode, you have Au+ + e- -----> Au(s) For the anode you have Au+ --------> Au3+ + 2e- He then added the above anode rxn to Au(s) -------> Au+ + e- By doing this, it canceled out the Au+ and resulted in Au(s) ------> Au3+ + 3e f...
- Wed Mar 10, 2021 4:46 pm
- Forum: General Rate Laws
- Topic: Rate determining step
- Replies: 38
- Views: 1580
Re: Rate determining step
Imagine if two people were running a race together but their finishing time was determined by the second person to cross the finish line. The rate then is determined by the the slower person and it does not matter how fast the fast person completed the race.
- Wed Mar 10, 2021 4:44 pm
- Forum: Student Social/Study Group
- Topic: Fave movie/show
- Replies: 67
- Views: 4969
Re: Fave movie/show
New girl is one of the best shows
Also Big Little Lies is very good
Also Big Little Lies is very good
- Wed Mar 10, 2021 4:44 pm
- Forum: General Rate Laws
- Topic: Intermediate
- Replies: 59
- Views: 3869
Re: Intermediate
An intermediate is a species that is a product in one reaction and then a reactant in the next. In other words, it is produced and then consumed.
- Wed Mar 10, 2021 4:43 pm
- Forum: Balancing Redox Reactions
- Topic: Studying for finals?
- Replies: 47
- Views: 2278
Re: Studying for finals?
All the review sessions are super helpful. I find it very helpful to also go through the textbook sections and read the ones on the outline and then try the problems
- Wed Mar 10, 2021 4:42 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: what is slow? fast?
- Replies: 11
- Views: 1585
Re: what is slow? fast?
The slow step compared to the fast means that one reaction is able to happen quickly and one more slow. The rate is determined by the slow reaction because the overall reaction will not be able to occur until the slow step has
- Wed Mar 10, 2021 4:40 pm
- Forum: General Rate Laws
- Topic: Final Exam
- Replies: 19
- Views: 817
Re: Final Exam
Does anyone know if the majority of questions will be focused on electrochemistry and kinetics since we haven't been tested on them yet? I think there will definitely be multiple questions form electrochem and kinetics but I am not sure I would say the majority. I would expect it to be a mix of tho...
- Wed Mar 10, 2021 4:38 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam Questions
- Replies: 15
- Views: 942
Re: Final Exam Questions
I dont think there will be exactly the same questions as a midterm but there will be similar. In addition, there will be exact questions from the textbook!
- Wed Mar 10, 2021 4:37 pm
- Forum: General Rate Laws
- Topic: Why are there negative orders
- Replies: 14
- Views: 729
Re: Why are there negative orders
Yes, this does have to do with equilibrium in the way that if you increase the concentration of products, rather then there being a strong tendency to form more reactants, there is instead a desire to form more reactants .
- Wed Mar 10, 2021 4:35 pm
- Forum: Zero Order Reactions
- Topic: Half life
- Replies: 19
- Views: 997
Re: Half life
You must use the specific half life equation for a zero order reaction which is t1/2 = [A]0/2k
- Wed Mar 10, 2021 4:34 pm
- Forum: General Rate Laws
- Topic: slow step
- Replies: 7
- Views: 364
Re: slow step
I think the slow step will be identified as such in the question, and you use the slow step to determine the rate law.
- Wed Mar 10, 2021 4:33 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Textbook 6M.5
- Replies: 5
- Views: 292
Re: Textbook 6M.5
I would also like to know the answer to this question as I am confused why we do not need it on the left side too since there is not a solid
- Wed Mar 10, 2021 4:31 pm
- Forum: General Rate Laws
- Topic: Factors Affecting k
- Replies: 83
- Views: 5550
Re: Factors Affecting k
K, the rate constant, can only be changed by the temperature
- Wed Mar 10, 2021 4:30 pm
- Forum: General Rate Laws
- Topic: When to use each rate law?
- Replies: 4
- Views: 285
Re: When to use each rate law?
Can someone tell me if you use the coefficient as the exponent for rate laws?
- Sun Jan 31, 2021 10:55 pm
- Forum: Student Social/Study Group
- Topic: Congrats!!
- Replies: 21
- Views: 1103
Re: Congrats!!
Yay! Good luck with the rest of your midterms !!
- Sun Jan 31, 2021 10:54 pm
- Forum: Student Social/Study Group
- Topic: Study Habits Part 2
- Replies: 16
- Views: 702
Re: Study Habits Part 2
The textbook problems and Step Up and Workshop sessions are without a doubt the keys to success in this class. It is such an advantage to be able to work through problems and familiarize yourself with the wording of questions. I also don't learn this type of material by reading the textbook but for ...
- Sun Jan 31, 2021 10:50 pm
- Forum: General Science Questions
- Topic: Midterm 1 Reactions
- Replies: 70
- Views: 4959
Re: Midterm 1 Reactions
I feel like the midterm was fair but did have more wordy/complicated questions than we had seen in the textbook or the UA workshops but I felt like if you had a good understanding of the material then you had an okay chance for a good score
- Sun Jan 31, 2021 10:48 pm
- Forum: Student Social/Study Group
- Topic: Favorite Music
- Replies: 113
- Views: 12291
Re: Favorite Music
I listen to a lot of Rex Orange County, Vampire Weekend, and Brockhampton
- Sun Jan 31, 2021 10:47 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Kc
- Replies: 36
- Views: 1409
Re: K vs. Kc
K and Kc are essentially the same thing. c is a subscript of K, denoting that it is the equilibrium constant for the concentration. Kp is also the same essentially but this is with partial pressures of gases instead.
- Sun Jan 31, 2021 10:45 pm
- Forum: Student Social/Study Group
- Topic: Midterm Grades
- Replies: 15
- Views: 733
Re: Midterm Grades
Yeah last quarter they took about a week to get back to us.
- Sun Jan 17, 2021 6:40 pm
- Forum: Ideal Gases
- Topic: Sapling Question #4
- Replies: 11
- Views: 555
Re: Sapling Question #4
If someone could help me with this one I would be so appreciative! I have tried so many times and can't figure out what I am doing wrong so if you could use my numbers that would be great!!
- Mon Jan 11, 2021 1:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Le Chatelier's principle on Midterm
- Replies: 9
- Views: 392
Re: Le Chatelier's principle on Midterm
I think Le CHatelier's principle would be one you would need to memorize for the midterm. Similar to how we had to remember Pauli Exclusion and Hund's rule ect.
- Mon Jan 11, 2021 1:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sampling hw #2
- Replies: 6
- Views: 539
Re: Sampling hw #2
As explained above, the chart with initial concentration, change in concentration, and equilibrium concentration is very helpful for this problem
- Mon Jan 11, 2021 1:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Sapling #4
- Replies: 7
- Views: 451
Re: Sapling #4
Yes that would be the equation. It would be helpful for this question to set up the table to determine the values in terms of x and then can use the quadratic formula to solve for x
- Mon Jan 04, 2021 2:10 pm
- Forum: Ideal Gases
- Topic: Converting concentration to partial pressure [ENDORSED]
- Replies: 3
- Views: 216
Converting concentration to partial pressure [ENDORSED]
Can someone explain to me how you would be able to figure out the partial pressure of a gas if you are not given the temperature?
- Sat Dec 12, 2020 10:16 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 3
- Views: 382
Re: Photoelectric Effect
To begin, you would need to use the wavelength given (converted to meters) to find the velocity of the ejected electron. The equation for this would be deBroglie's so wavelength=planks constant/(mass)(velocity) Once you have the velocity of the electron, you can use 1/2mv^2 to find the Kinetic energ...
- Sun Dec 06, 2020 11:50 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number Question
- Replies: 12
- Views: 739
Re: Coordination Number Question
Coordination number is the number of bonds but you must keep in mind that some ligands are bidentate/tridentate/tetradentate ect and would contribute 2 or more bonds. These additional bonds must be taken into account to find the correct coordination number.
- Sun Dec 06, 2020 11:47 am
- Forum: Naming
- Topic: Naming H2O
- Replies: 11
- Views: 649
Re: Naming H2O
It does not matter really how you write it. I remember in lecture that Lavelle wrote it as OH2 to show that the oxygen was what was donating the electrons rather than the Hydrogen
- Sun Dec 06, 2020 11:45 am
- Forum: Student Social/Study Group
- Topic: Studying for Final Exam
- Replies: 57
- Views: 2851
Re: Studying for Final Exam
I am starting by doing 10 problems from each section on the outlines and then checking them and the sections where I struggled I will go back and re-read the textbook section and try more problems.
- Sun Dec 06, 2020 11:43 am
- Forum: Resonance Structures
- Topic: Stability
- Replies: 13
- Views: 746
Re: Stability
Resonance structures are determined to be more stable because they represent delocalized electrons and the fact that they can be found in multiple places. In general delocalized electrons are spread out over the molecule which makes it more stable than if it was fixed location.
- Sun Dec 06, 2020 11:41 am
- Forum: Hybridization
- Topic: How to simply determine hybridization
- Replies: 27
- Views: 11384
Re: How to simply determine hybridization
I think of hybridization in terms of the electron configuration where the hybridization orbitals are the combination of the orbitals with electrons in them
- Sun Dec 06, 2020 11:39 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Flashcards
- Replies: 8
- Views: 319
Re: Flashcards
I find flashcards very helpful for this class in general. I have the name of a compound on one side and the lewis structure and properties on the other and write down what I think the answer is on a piece of paper and then check it with the back after.
- Sun Dec 06, 2020 11:37 am
- Forum: Lewis Acids & Bases
- Topic: Lewis Acids & Bases
- Replies: 12
- Views: 1174
Re: Lewis Acids & Bases
I think the way that it is most similar to high school chemistry is in the fact that a lewis acid is electron-deficient and the lewis base is electron-rich and the electron-rich donates to the electron-deficient.
- Sun Dec 06, 2020 11:35 am
- Forum: Amphoteric Compounds
- Topic: Amphoteric
- Replies: 11
- Views: 753
Re: Amphoteric
An amphoteric substance is one that is able to react as both an acid and a base. Amphiprotic is a substance that could accept or donate H+ ions.
- Sun Dec 06, 2020 11:32 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: ligands
- Replies: 11
- Views: 489
Re: ligands
NH3 is neutral because the N has a charge of -3 and each H has a charge of +1 creating an overall charge of 0 for the compound.
- Sun Dec 06, 2020 11:30 am
- Forum: General Science Questions
- Topic: State of a molecule
- Replies: 6
- Views: 682
Re: State of a molecule
I do not think any questions would be asked in this class about what state of matter an atom or molecule would be in. Other than knowing that metals are solid and the obvious gasses, you should be solid
- Sun Dec 06, 2020 11:26 am
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 21
- Views: 871
Re: Final
Yes in Lavelle's reviews he should talk about the format and details for the final but it should be the same format and set up as the midterms.
- Sun Dec 06, 2020 11:25 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Sapling Week 9 #4
- Replies: 5
- Views: 378
Re: Sapling Week 9 #4
I believe it is the case that a ligand is a lewis base but all lewis bases are not ligands. A ligand is specifically the lewis base as part of a coordination compound.
- Sun Dec 06, 2020 11:22 am
- Forum: Biological Examples
- Topic: Hemoglobin vs. Myoglobin
- Replies: 30
- Views: 1365
Re: Hemoglobin vs. Myoglobin
Myoglobin is found in the tissues of the body while hemoglobin is found in the blood. They both serve the same purpose of transporting oxygen around the body but hemoglobin carried 4 times the amount of oxygen as myoglobin
- Sun Dec 06, 2020 11:21 am
- Forum: Resonance Structures
- Topic: Valence Electrons [ENDORSED]
- Replies: 46
- Views: 4029
Re: Valence Electrons [ENDORSED]
For the s and p orbitals, you can use the group number to tell you how many valence electrons an element has, and for the d block, you can think about writing the halogen electron configuration and see how many electrons are written
- Sun Dec 06, 2020 11:18 am
- Forum: Naming
- Topic: Helpful Videos for Naming
- Replies: 22
- Views: 1178
Re: Helpful Videos for Naming
This is so helpful. I was struggling with naming a lot and these videos helped me out a ton.
- Sun Dec 06, 2020 11:16 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordinate Covalent Bond
- Replies: 6
- Views: 436
Re: Coordinate Covalent Bond
As stated, a coordination covalent bond connects a ligand to a transition metal ion. The ligand contributes both electrons to the transition metal which is why it is a coordination covalent bond.
- Sun Dec 06, 2020 11:15 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: linear same atoms?
- Replies: 6
- Views: 403
Re: linear same atoms?
I believe the fact that they are the same atom does not make a difference in this case. You have to take into account the bound atoms and lone pairs to determine the geometry
- Sun Dec 06, 2020 11:13 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Structure Names
- Replies: 5
- Views: 208
Re: Structure Names
The reason that a molecule with 6 electron regions has an octahedral geometry is that the shape that is made in which the atoms would be the most stable is called an octahedron. This shape has 6 vertices which would represent the positions of the 6 electron regions. As for trigonal bipyramidal, a mo...
- Sun Dec 06, 2020 11:05 am
- Forum: Amphoteric Compounds
- Topic: Memorization?
- Replies: 10
- Views: 461
Re: Memorization?
I think it is very helpful to know them and have them memorized.
- Sun Dec 06, 2020 11:05 am
- Forum: Student Social/Study Group
- Topic: How are you?
- Replies: 154
- Views: 14892
Re: How are you?
I am doing pretty well. Finals feel more stressful this quarter than usual for some reason.
- Sun Dec 06, 2020 11:03 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Memorizing the name of complex ligands
- Replies: 6
- Views: 434
Re: Memorizing the name of complex ligands
Hi I was wondering if anyone could explain to me how you would go about naming [Co (NH3)3Cl3]
I thought it would be triamminetrichlorocobalt(II)
I thought it would be triamminetrichlorocobalt(II)
- Tue Dec 01, 2020 7:07 pm
- Forum: Hybridization
- Topic: Textbook Q 2F #7
- Replies: 4
- Views: 334
Re: Textbook Q 2F #7
Hey! So AsF3 has a tetrahedral arrangement but a pyramidal shape due to the fourth electron region being a lone pair rather than an atom. The tetrahedral arrangement means that there is a hybridization of the one S and three P orbitals which is why it is sp3. You can also think of it as s + p*p*p.
- Tue Dec 01, 2020 6:58 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis Acids and Bases
- Replies: 3
- Views: 211
Lewis Acids and Bases
Hi can someone explain to me what it means that the acid donates protons to the base?
- Tue Dec 01, 2020 6:54 pm
- Forum: Student Social/Study Group
- Topic: Final Exam Study Tips
- Replies: 48
- Views: 2571
Re: Final Exam Study Tips
I have also used organic chem tutor on youtube! I found that really helpful.
- Tue Dec 01, 2020 6:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: fall 2020 final
- Replies: 17
- Views: 896
Re: fall 2020 final
He has not said how the final will be proctored. I assume it will be similar to the earlier midterms and I believe it is in the same multiple-choice format as the midterms.
- Tue Dec 01, 2020 6:50 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Sapling Number 3
- Replies: 8
- Views: 363
Re: Sapling Number 3
As the person above said, you would be correct that seesaw geometry has four bonds and thus a coordination number of 4, it is not the most common geometry for molecules with four bonds.
- Tue Dec 01, 2020 6:46 pm
- Forum: Lewis Structures
- Topic: Octet rule
- Replies: 12
- Views: 725
Re: Octet rule
The exceptions for the octet rule include examples such as SF6 where Sulfur can accommodate more than 8 valence electrons and BCl3 where Boron has less than 8 electrons in its valence shell.
- Tue Nov 24, 2020 6:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grading Scale
- Replies: 4
- Views: 209
Re: Grading Scale
No an A+ and A have the same GPA
- Tue Nov 24, 2020 4:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm 2 Scores
- Replies: 9
- Views: 460
Re: Midterm 2 Scores
Does anyone know if there is any way to review the ones you missed on midterm 2?
- Sun Nov 08, 2020 11:51 pm
- Forum: Student Social/Study Group
- Topic: Post Midterm Blues
- Replies: 71
- Views: 3785
Re: Post Midterm Blues
Don’t stress too much! The chemistry community points along with the homework make up a good portion of the grade and you can do better on the next tests!!
- Sun Nov 08, 2020 11:48 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Importance of anions and cations
- Replies: 15
- Views: 1231
Re: Importance of anions and cations
Anions are just atoms that gain electrons or become more negative to be in a more stable state. cations are similar except for they lose electrons or become more positive to reach a more stable state.
- Sun Nov 08, 2020 11:46 pm
- Forum: Resonance Structures
- Topic: Valence Electrons [ENDORSED]
- Replies: 46
- Views: 4029
Re: Valence Electrons [ENDORSED]
The number of valence electrons is found by going across the period of the element and counting how many. So carbon would be 4, oxygen 6 etc.
- Sun Nov 08, 2020 11:45 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2
- Replies: 28
- Views: 1164
Re: Midterm 2
I found the text book problems, step up sessions, and workshops so helpful because you get to see most of the types of questions that will be asked on the midterm.
- Sun Nov 01, 2020 2:50 pm
- Forum: Photoelectric Effect
- Topic: Sapling Problem #6
- Replies: 9
- Views: 5380
Re: Sapling Problem #6
Yes, the number of spectral lines is equal to the number of possible transitions from n=7 to n=1. To find the wavelength range you just have to find the wavelength corresponding to the transition from n=7 to n=6 and the wavelength corresponding to the transition from n=7 to n=1. These would be the m...
- Sun Nov 01, 2020 2:47 pm
- Forum: Photoelectric Effect
- Topic: Sapling HW #11
- Replies: 5
- Views: 188
Re: Sapling HW #11
To solve this, make sure you remember to convert nanometers to m in order to do the proper calculations. To find the frequency from the wavelength you would first use c= frequency/wavelength. Once you have the frequency, you plug it into the equation f= (Rydberg's constant) (1/n(final) - 1/n(initial...
- Sun Nov 01, 2020 2:40 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: The orbitals
- Replies: 8
- Views: 574
Re: The orbitals
I think there is a lot of information we will need to know requiring the orbitals. Mainly, it is important to be able to identify an atom from its ground-state electron configuration, (which is where the 2s and 3s come from). The periodic table is separated into blocks, corresponding to the type of ...
- Sun Nov 01, 2020 2:15 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Equations Coefficient Question
- Replies: 24
- Views: 2728
Re: Balancing Equations Coefficient Question
Yes, you have the right idea about it. since you do not want a coefficient to be 15/2 you have to multiply every coefficient by 2 so they are all in whole numbers and maintain the correct ratio
- Sun Nov 01, 2020 2:08 pm
- Forum: Properties of Electrons
- Topic: Sapling HW #1
- Replies: 6
- Views: 273
Re: Sapling HW #1
As they stated above, the wavelength and frequency do not change based on the number of photons. The value you get for energy is per photon so you must only multiply this value by 100 to get the total energy.
- Sun Oct 18, 2020 6:22 pm
- Forum: Student Social/Study Group
- Topic: Midterm - extra review
- Replies: 3
- Views: 271
Re: Midterm - extra review
hey again kendall!! still missing you! Wish we were back in class with sam and brandee! I would love to do some midterm review over zoom with you! Text me and let me know when works best!
- Sun Oct 18, 2020 6:18 pm
- Forum: Student Social/Study Group
- Topic: Discussion 2D GroupMe
- Replies: 4
- Views: 154
Re: Discussion 2D GroupMe
Hey Kendall! Miss you from last year's ls7b class! Do you know if the first midterm will cover weeks 1-3 only or if the beginning of week 4 is included?
- Sun Oct 18, 2020 4:09 pm
- Forum: Properties of Electrons
- Topic: protons and electrons
- Replies: 33
- Views: 2674
Re: protons and electrons
Protons and neutrons have around the same mass of about 1.67 x 10^-24 grams while electrons are only 9.109 x 10^-28g. Protons and neutrons determine the mass of an atom, while electrons move from atom to atom without a significant change in mass
- Sun Oct 18, 2020 4:03 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test Accuracy
- Replies: 13
- Views: 840
Re: Test Accuracy
Although I believe for this quarter the exams are multiple-choice so it is not as important, usually, it is good to have your answers in 3 or 4 sig figs. Also, it does depend on the TA since they are grading but usually there is a range for the answers to account for rounding errors.
- Sun Oct 18, 2020 3:58 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 8
- Views: 359
Re: Study Tips
I think the problems on the audiovisual topics are the most helpful for studying. It is helpful to see many different problems for each topic so you will be prepared for the kinds of questions being asked on the midterm. Also, of course, it is important to have a good background for what you are doi...
- Sun Oct 18, 2020 3:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm monitoring
- Replies: 4
- Views: 234
Re: Midterm monitoring
I am assuming we can be muted for the exam as I have two roommates who would be using the space I would be taking the exam. My TA said that they want to be monitoring your workspace rather than your face. He recommended getting a webcam that would attach to your computer.
- Sun Oct 18, 2020 3:54 pm
- Forum: Student Social/Study Group
- Topic: Forming Virtual Study Group
- Replies: 31
- Views: 1201
Re: Forming Virtual Study Group
I would love to be part of the virtual study group my Instagram is _abbyhyman
- Sun Oct 11, 2020 2:54 pm
- Forum: Balancing Chemical Reactions
- Topic: States of Molecules
- Replies: 9
- Views: 421
Re: States of Molecules
The state of the molecule is not required for balancing equations right now. I believe Lavelle will discuss more of this later on in the quarter, but not something that is tested on I don't think.
- Sun Oct 11, 2020 2:48 pm
- Forum: SI Units, Unit Conversions
- Topic: Conversion Factors
- Replies: 6
- Views: 205
Re: Conversion Factors
Along with the conversion factor link on the website, I believe you are given some conversions on the formula sheet for tests.
- Sun Oct 11, 2020 2:47 pm
- Forum: Balancing Chemical Reactions
- Topic: Periodic Table
- Replies: 66
- Views: 5009
Re: Periodic Table
I believe the periodic table is always provided to you if you need it for exams so memorizing would be unnecessary. It does save time to know the molar masses for some of the commonly used elements though, so you do not have to refer back every time.
- Sun Oct 11, 2020 2:45 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular Formula
- Replies: 3
- Views: 227
Re: Molecular Formula
Although the molecular formula is directly related to the molar mass of elements and the compound, there is not a common multiple that would take you from molar mass to molecular formula. If you meant how to get from empirical formula to molecular formula using the total molar mass, then you would a...
- Sun Oct 11, 2020 2:39 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular Compound
- Replies: 3
- Views: 210
Re: Molecular Compound
I believe for this class you just need to recognize the common ones but will not be asked to produce the name based on only the empirical formula.