Search found 111 matches
- Mon Mar 15, 2021 7:42 pm
- Forum: Ideal Gases
- Topic: K and Q
- Replies: 57
- Views: 3966
Re: K and Q
Because Q isn't always at equilibrium. K always equals Q when Q is at equilibrium.
- Mon Mar 15, 2021 7:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 300639
Re: Tutoring? [ENDORSED]
Thank you so much for sending those links!!
- Mon Mar 15, 2021 7:38 pm
- Forum: Student Social/Study Group
- Topic: Rounding/Grades
- Replies: 13
- Views: 1382
Re: Rounding/Grades
I think Lavelle rounds when there are small decimal points involved
- Mon Mar 15, 2021 7:35 pm
- Forum: Student Social/Study Group
- Topic: On Campus class vs. remote
- Replies: 21
- Views: 1611
Re: On Campus class vs. remote
I hope it will be in person and even if it is hybrid I would definitely want to live on campus.
- Sat Mar 13, 2021 11:34 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing Vs Reducing agent
- Replies: 39
- Views: 2212
Re: Oxidizing Vs Reducing agent
A reducing agent helps another molecule become reduced while an oxidizing agent helps another molecule become oxidized.
In this process, oxidizing agents become reduced and reducing agents become oxidized.
In this process, oxidizing agents become reduced and reducing agents become oxidized.
- Sat Mar 13, 2021 11:31 pm
- Forum: Balancing Redox Reactions
- Topic: Studying for finals?
- Replies: 47
- Views: 2579
Re: Studying for finals?
I would go through all your textbook problems one more time.
- Sat Mar 13, 2021 11:28 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: confusion on using Cp and Cv
- Replies: 24
- Views: 1218
Re: confusion on using Cp and Cv
The relationship between Cp and Cv is that Cp=Cv+R
- Sat Mar 13, 2021 11:27 pm
- Forum: Biological Examples (*DNA Structural Transitions, etc.)
- Topic: Heat Capacity [ENDORSED]
- Replies: 5
- Views: 2413
Re: Heat Capacity [ENDORSED]
The more degrees of freedom a molecule has, the higher its heat capacity is.
- Sat Mar 13, 2021 11:25 pm
- Forum: Van't Hoff Equation
- Topic: Test
- Replies: 10
- Views: 902
Re: Test
Is this referring to the final or the 2nd midterm????
- Sat Mar 13, 2021 11:23 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: delta s=(qrev)/T
- Replies: 4
- Views: 555
Re: delta s=(qrev)/T
The rev is implying reversible- because this equation applies to reversible processes.
- Sat Mar 13, 2021 11:21 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Useful Summary of Thermodynamic Definitions
- Replies: 55
- Views: 18753
Re: Useful Summary of Thermodynamic Definitions
This is super helpful!!! For adiabatic systems, doesn't delta q=0?
- Sat Mar 13, 2021 11:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 33
- Views: 1576
Re: K
Kc is the same exact thing as K it is just used for molar concentrations. Similarly, Kp is used for partial pressure.
- Sat Mar 13, 2021 11:17 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Adding a gas
- Replies: 26
- Views: 1260
Re: Adding a gas
Argon has no affect on the equilibrium because it is an inert gas
- Sat Mar 13, 2021 11:15 pm
- Forum: Ideal Gases
- Topic: Reversing Reactions
- Replies: 68
- Views: 2767
Re: Reversing Reactions
When you reverse a reaction, it turns into 1/K.
- Sat Mar 13, 2021 11:12 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation Numbers: Provided or memorize?
- Replies: 26
- Views: 2170
Re: Oxidation Numbers: Provided or memorize?
Definitely memorize that oxygen is -2 and hydrogen is 1. Besides that, you should be fine!
- Sat Mar 13, 2021 11:12 pm
- Forum: Balancing Redox Reactions
- Topic: E at equilibrium
- Replies: 7
- Views: 661
Re: E at equilibrium
The reactant quotient stops changing at equilibrium. Therefore the deltaE at equilibrium is equal to zero.
- Sat Mar 13, 2021 11:04 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: using the Nernst equation
- Replies: 4
- Views: 400
Re: using the Nernst equation
emmaferry2D wrote:When using the Nernst equation and a given pressure of a gas is in bar or Torr do you need to convert it to atm? or are you able to use the different values of R that match that pressure value
I would convert Torr to Atm but with Barr I think you're fine
- Sat Mar 13, 2021 11:02 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Calculating n
- Replies: 17
- Views: 1072
Re: Calculating n
You need to calculate the number of electrons in the two half reactions and then make sure the number of electrons in both reactions are even then use that # as your n value.
- Sat Mar 13, 2021 10:55 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: porous disk
- Replies: 7
- Views: 448
Re: porous disk
With a salt bridge, the two beakers are separate and the salt bridge transfers the ions whereas in a porous disk the ions can directly transfer through the disk
- Sat Mar 13, 2021 10:48 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nerst Equation
- Replies: 3
- Views: 406
Re: Nerst Equation
You calculate e naught by using the standard potentials of the cell in the half rxns. given
- Sat Mar 13, 2021 10:46 pm
- Forum: Balancing Redox Reactions
- Topic: Tips for balancing a reaction with acidic/basic condition
- Replies: 12
- Views: 893
Re: Tips for balancing a reaction with acidic/basic condition
How I've done it so far is start by balancing the elements that aren't H or O. Once those are equal, balance the O by using H2O. After that, for reactions in acidic solutions you use H+ to balance the hydrogens. For basic solutions, it's easiest to first balance hydrogens using H+, then for the num...
- Sat Mar 13, 2021 10:44 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Control of Reactions
- Replies: 3
- Views: 350
Re: Control of Reactions
If a reaction is spontaneous but does not occur due to the presence of a large energy barrier, it is controlled by kinetics. Reversely, if a reaction has a negative delta G and does occur, it is controlled by thermodynamics.
- Sat Mar 13, 2021 10:42 pm
- Forum: Zero Order Reactions
- Topic: Overall reaction order
- Replies: 22
- Views: 1213
Re: Overall reaction order
If all of the reactants were to be zero-order, the reaction would be a zero order reaction.
- Sat Mar 13, 2021 10:40 pm
- Forum: *Enzyme Kinetics
- Topic: catalyst
- Replies: 23
- Views: 2830
Re: catalyst
Enzymes also function as catalysts because they also lower the activation energy of a reaction
- Sat Mar 13, 2021 10:39 pm
- Forum: General Rate Laws
- Topic: Intermediate
- Replies: 59
- Views: 4118
Re: Intermediate
An intermediate is produced, AND consumed in a reaction
- Sat Mar 13, 2021 10:38 pm
- Forum: Second Order Reactions
- Topic: Derivations of Reactions
- Replies: 5
- Views: 533
Re: Derivations of Reactions
You will need to know the equations but you likely don't need to know how to derive the equations(especially because the test is multiple choice)
- Sat Mar 13, 2021 10:22 pm
- Forum: Second Order Reactions
- Topic: Sapling #12 Week9/10
- Replies: 7
- Views: 551
Re: Sapling #12 Week9/10
You gotta view how the half life changes when the concentration changes. Then use the exponent to make these match up
- Sat Mar 13, 2021 10:19 pm
- Forum: Second Order Reactions
- Topic: Determining slow step
- Replies: 22
- Views: 1277
Re: Determining slow step
I usually can tell by knowing that the reactants in the slow step are part of the overall rate law.
- Sat Mar 13, 2021 10:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 643605
Re: Saying Thank You to Dr. Lavelle
Thank you for a great quarter DJ LL!!!
- Sun Mar 07, 2021 4:39 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: when can we not use -0.0592/n when finding the E of a cell?
- Replies: 10
- Views: 886
Re: when can we not use -0.0592/n when finding the E of a cell?
When the reaction doesn't occur under standard conditions.
- Sun Mar 07, 2021 4:37 pm
- Forum: Balancing Redox Reactions
- Topic: Sapling week 7/8 Question 18
- Replies: 5
- Views: 440
Re: Sapling week 7/8 Question 18
Just take the parentheses out and you should be good!!!
- Sun Mar 07, 2021 4:20 pm
- Forum: Student Social/Study Group
- Topic: Final Study Tips!
- Replies: 38
- Views: 2523
Re: Final Study Tips!
Youtube vids, redo sapling problems, and the textbook problems. That's the best way to study and I recommend doing all of these things for 3 hours a day the week leading up to the final.
- Thu Feb 25, 2021 5:53 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Calculating degeneracy
- Replies: 18
- Views: 3628
Re: Calculating degeneracy
The equation to calculate degeneracy (W) is the following: W=(possible positions)^the number of particles
- Thu Feb 25, 2021 5:52 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy value
- Replies: 17
- Views: 968
Re: Entropy value
Entropy tells us how much disorder there is in a system. When the volume increases, the entropy increases. When entropy is positive, the process is spontaneous.
- Thu Feb 25, 2021 5:32 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: q and w for an Isolated System
- Replies: 19
- Views: 3519
Re: q and w for an Isolated System
In an isolated system, both q and w would equal 0. Isolated systems always have an internal energy of 0
- Thu Feb 25, 2021 5:28 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: 4a.5 Reversible expansion and work
- Replies: 2
- Views: 340
Re: 4a.5 Reversible expansion and work
In Lavelle's lecture, he talks about reversible expansion using maximum work whereas irreversible expansion expands instantly and doesn't use as much work(it also isn't as efficient)
- Thu Feb 25, 2021 5:02 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Specific Heat
- Replies: 9
- Views: 716
Re: Specific Heat
Specific heat does not change depending on the amount of substance but specific heat capacity does. Specific heat capacity can be modeled by q=mcdelta or q=ncdeltaT depending on whether you want to find the specific heat in mass or moles.
- Thu Feb 25, 2021 4:56 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Q Question
- Replies: 7
- Views: 601
Re: Q Question
CdeltaT is normally used for calorimetry problems but when referring to substances we use c=nCdeltaT
- Thu Feb 25, 2021 4:38 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: R Constant
- Replies: 91
- Views: 8176
Re: R Constant
You have to use the R value that matches up with your units. For example, when calculating work you would use 8.314 J. Look at the equation sheet and choose the R value that matches up with the units in your problem.
- Thu Feb 25, 2021 4:36 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Is thermal mugs an example of an isolated system?
- Replies: 38
- Views: 2267
Re: Is thermal mugs an example of an isolated system?
It would be very near to an isolated system. No mass is exchanged and the longer heat is contained in the thermal mug, the closer it is to an isolated system.
- Thu Feb 25, 2021 4:32 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed system energy change
- Replies: 16
- Views: 888
Re: closed system energy change
No these are different because adding heat is defined by q whereas doing work is defined by w. However, both heat and work do add up to giving the internal energy of the system
- Thu Feb 25, 2021 4:30 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Acids and Bases
- Replies: 15
- Views: 950
Re: Acids and Bases
It sucks to hear but the easiest way to go about this is to simply just memorize them.
- Thu Feb 25, 2021 4:29 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE Chart Question
- Replies: 26
- Views: 1676
Re: ICE Chart Question
Yes you still do take it into consideration for the exponents. This is because the -2x accounts for the molar concentrations whereas the ^2 exponent is related to the equilibrium concentration.
- Thu Feb 25, 2021 4:25 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Strong Acids/Bases
- Replies: 19
- Views: 1485
Re: Strong Acids/Bases
You need to know the 7 strong acids: HCl, HI, HBr, H2SO4, HNO3, HClO4, and HClO3
as well as the 8 strong bases: (Li) (Na)(K) (Rb) (Cs) (Ca) (Sr) (Ba)
I'm pretty sure this is all you need to memorize for the strong acids/bases but someone please correct me if I'm missing anything
as well as the 8 strong bases: (Li) (Na)(K) (Rb) (Cs) (Ca) (Sr) (Ba)
I'm pretty sure this is all you need to memorize for the strong acids/bases but someone please correct me if I'm missing anything
- Thu Feb 25, 2021 4:22 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Adding a gas
- Replies: 26
- Views: 1260
Re: Adding a gas
Thats because argon is an inert gas, which basically means that it has 0 affect on the system.
- Thu Feb 25, 2021 4:21 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Explaining Le Chatelier's Principle
- Replies: 14
- Views: 1173
Re: Explaining Le Chatelier's Principle
If you change the concentration or partial pressure, the reaction will shift towards the side that has less. This means if you add reactants, the reaction will shift to the products, but if you take away reactants, the reaction will shift to the reactants. If you increase the pressure of the entire...
- Thu Feb 25, 2021 4:18 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: is HClO3 weak or strong? [ENDORSED]
- Replies: 49
- Views: 4881
Re: is HClO3 weak or strong? [ENDORSED]
HCLO3 is considered one of the 7 strong acids that we should know!
- Thu Feb 25, 2021 4:17 pm
- Forum: Ideal Gases
- Topic: Kc vs. Kp
- Replies: 71
- Views: 3025
Re: Kc vs. Kp
Kc and Kp are solved for in the exact same way. Kc uses the concentrations whereas Kp uses the pressures(make sure all the pressures have the same units(ex:atm,barr,etc.)
- Thu Feb 25, 2021 4:15 pm
- Forum: Ideal Gases
- Topic: Ideal Gas vs/ Real Gas
- Replies: 10
- Views: 1183
Re: Ideal Gas vs/ Real Gas
I believe that real gases have intermolecular attraction and each particle has different volumes. Yet, we assume that all gases are ideal gases in this class im pretty sure.
- Thu Feb 25, 2021 4:13 pm
- Forum: Ideal Gases
- Topic: Chem BL
- Replies: 107
- Views: 10872
Re: Chem BL
I'm taking 14C next quarter, and will likely take 14BL fall quarter of next year.
- Thu Feb 25, 2021 4:10 pm
- Forum: Ideal Gases
- Topic: Conditions
- Replies: 20
- Views: 1624
Re: Conditions
STP stands for standard temp and pressure. STP is 1atm(technically .986 but Lavelle uses 1 atm) and 273.15K.
- Thu Feb 25, 2021 4:08 pm
- Forum: Ideal Gases
- Topic: Exo vs Endothermic
- Replies: 40
- Views: 2765
Re: Exo vs Endothermic
This equation seems very vague and I'm not totally sure how you would be able to tell if the equation is exo or endothermic. On the test the deltaH will likely be given but I like to think that exothermic is bonds being formed because forming bonds gives off heat whereas endothermic is breaking bond...
- Thu Feb 25, 2021 4:03 pm
- Forum: Ideal Gases
- Topic: Units for K
- Replies: 29
- Views: 1372
Re: Units for K
Since K is just informing us of a ratio(of Products to Reatants) the units would cancel and that's why K doesn't contain any units.
- Thu Feb 25, 2021 4:01 pm
- Forum: Ideal Gases
- Topic: 4.17 How to Identify When We Should Use the Ideal Gas Law?
- Replies: 4
- Views: 508
Re: 4.17 How to Identify When We Should Use the Ideal Gas Law?
This is a very good question because there is not one exactly correct answer that I could give you. In my experience, what I like to do is set up the problem using the given equations(ex: w=-nRTln(V1/V2). In this case I am trying to find the amount of work done. However, sometimes after setting this...
- Thu Feb 25, 2021 3:21 pm
- Forum: Student Social/Study Group
- Topic: Culinary Chemistry
- Replies: 239
- Views: 42750
Re: Culinary Chemistry
Something I recently learned was the difference between heat-safe and regular glass. Heat-safe glass (like the kind you can use oven, eg. Pyrex) is made of borosilicate glass, which has a low coefficient of thermal expansion and therefore is less likely to break at high temperatures. I think this i...
- Thu Feb 25, 2021 2:42 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Bomb Calorimeter
- Replies: 14
- Views: 4931
Re: Bomb Calorimeter
Yes, a bomb calorimeter is an isolated system and matter/energy can't leave the system therefore it would be considered a "perfect system"
- Thu Jan 28, 2021 11:45 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Chem 14B Midterm Week 4
- Replies: 3
- Views: 168
Chem 14B Midterm Week 4
Hey!
Does anyone know up to which lecture we should study for for the midterm?? I believe it was all the content up to the end of Monday's lecture(1/25), but could someone correct me if I'm wrong??
Does anyone know up to which lecture we should study for for the midterm?? I believe it was all the content up to the end of Monday's lecture(1/25), but could someone correct me if I'm wrong??
- Thu Jan 28, 2021 11:43 am
- Forum: Administrative Questions and Class Announcements
- Topic: Matthew's Workshop - Week 4
- Replies: 3
- Views: 702
Re: Matthew's Workshop - Week 4
Thank you Matthew!!! Will a question like number 4 appear on the midterm??
- Sun Jan 10, 2021 11:20 pm
- Forum: Ideal Gases
- Topic: Units of Temperature
- Replies: 82
- Views: 4470
Re: Units of Temperature
Juwan_Madaki_3K wrote:When using the ideal gas law, which units should the temperature be in? Kelvins or Celsius?
You would use Kelvin for the ideal gas law
- Sun Jan 10, 2021 10:57 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3942242
Re: Post All Chemistry Jokes Here
Did you know that you can cool yourself to -273.15˚C and still be 0k?
This one blew me out of the water
This one blew me out of the water
- Tue Dec 15, 2020 12:14 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Sapling Question 13
- Replies: 4
- Views: 318
Re: Sapling Question 13
Jacob Schwarz wrote:Because the pH is bigger than the pkA in this problem, the solution therefore has a charge involved in it.
I forgot to clarify on this post but the charge also indicates that it's basic(according to this solution).
- Tue Dec 15, 2020 12:13 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Sapling Question 13
- Replies: 4
- Views: 318
Re: Sapling Question 13
Because the pH is bigger than the pkA in this problem, the solution therefore has a charge involved in it.
- Tue Dec 15, 2020 12:09 am
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 435403
Re: Final Jitters
Don't know how you guys felt about it but just wanna let you know that I hope y'all did good on it and there is nothing we can do now so just wanted to say I love you all!!
- Tue Dec 15, 2020 12:07 am
- Forum: DeBroglie Equation
- Topic: Units for DeBrogile Equation
- Replies: 9
- Views: 584
Re: Units for DeBrogile Equation
For the DeBroglie Equation:
Mass=kilograms(kg)
Velocity=meters per second(m/s)
Wavelength=meters(m)
Mass=kilograms(kg)
Velocity=meters per second(m/s)
Wavelength=meters(m)
- Tue Dec 15, 2020 12:01 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty in position
- Replies: 5
- Views: 506
Re: Uncertainty in position
You would multiply .01 by .05nm, which is the uncertainty in position, and by doing this you find 1% of .05 nm. (+- 1)
- Mon Dec 14, 2020 11:52 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Course Evaluations
- Replies: 9
- Views: 989
Re: Course Evaluations
If you use the link through the email it will likely help. It's due Wednesday morning though and I think they extended it for the same problems you were having.
- Mon Dec 07, 2020 10:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing the E-textbook [ENDORSED]
- Replies: 125
- Views: 35833
Re: Accessing the E-textbook [ENDORSED]
Kennedi2J wrote:Does anyone know if Sapling is mandatory?
The sapling is mandatory for points.
- Mon Dec 07, 2020 10:13 pm
- Forum: Resonance Structures
- Topic: Stability
- Replies: 13
- Views: 778
Re: Stability
They are more stable due to the delocalization of the electrons in resonance structures. The electrons have more options and therefore increased stability. I hope this helps!
- Mon Dec 07, 2020 10:09 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Preference on Scientific Notation
- Replies: 13
- Views: 810
Re: Preference on Scientific Notation
1.0*10^6 is used more often, yet both are technically correct. I would stick to the former because it is what is used on the midterms/finals.
- Mon Dec 07, 2020 10:04 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro constant
- Replies: 40
- Views: 2720
Re: Avogadro constant
You use this constant to convert atoms/electrons/molecules into the number of moles, or conversely the number of moles into atoms/electrons/molecules.
- Mon Dec 07, 2020 10:02 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3942242
Re: Post All Chemistry Jokes Here
What's the dullest element?
Obviously Bohrium!
Obviously Bohrium!
- Mon Nov 30, 2020 11:04 am
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 472762
Re: Rusty on High School Chem [ENDORSED]
Hey Rusty!! If you watch lavelles audio visual concepts on his website, this should help a lot. I also recommend taking his post module tests multiple times. These caught me up, but he also reviews everything during his lectures. He doesn’t expect you to know much coming in, and reviews everything w...
- Mon Nov 30, 2020 10:57 am
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 29
- Views: 2925
Re: Sigma and Pi bonds
Sigma bonds are single bonds and Pi bonds are double or triple bonds. Every bond contains a sigma bond. Ex: double bond=1 sigma + 1pi, triple bond=1 sigma +2 pi
- Mon Nov 30, 2020 10:55 am
- Forum: Hybridization
- Topic: Hybridization of Carbon
- Replies: 10
- Views: 392
Re: Hybridization of Carbon
Because Carbon has 4 valence electrons, it forms 4 bonds. 1 electron in the S state and three unpaired electrons in the P state. Therefore sp3
- Mon Nov 30, 2020 10:53 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sapling Week 8 #3
- Replies: 5
- Views: 350
Re: Sapling Week 8 #3
Because of the additional lone pair, the bond angles will be slightly lower than 109.5. Answers such as 109,108,or 107 would likely be sufficient
- Mon Nov 30, 2020 10:49 am
- Forum: Hybridization
- Topic: How to simply determine hybridization
- Replies: 27
- Views: 11761
Re: How to simply determine hybridization
You first need to calculate how many regions of electron density you have. From there if you have 4 regions, it will be sp3, 5 regions, sp3d, and so on
- Mon Nov 30, 2020 10:47 am
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 157763
Re: Reading the textbook
I do try to read the textbook but quite honestly, at times it is very difficult to read. I would definitely recommend trying your best, but I’ve found the textbook problems the most helpful
- Mon Nov 30, 2020 10:41 am
- Forum: Electronegativity
- Topic: Polarity of Molecules
- Replies: 10
- Views: 689
Re: Polarity of Molecules
If the central atom is bonded to a more electronegative atom, the central atom will be pulled towards that atom, creating a polar atom. The symmetry of an atom also determines whether the molecule is polar. If the molecule is symmetrical, it is likely non-polar, and vice-versa
- Mon Nov 30, 2020 10:29 am
- Forum: Electronegativity
- Topic: Be vs Cl
- Replies: 49
- Views: 3122
Re: Be vs Cl
Hey Karina!!
Although Be is one row higher than Cl, Cl is much farther to the right than Be. Because it is much farther to the right, this outweighs the fact that Be is one row higher. Cl therefore has the higher electronegativity.
Although Be is one row higher than Cl, Cl is much farther to the right than Be. Because it is much farther to the right, this outweighs the fact that Be is one row higher. Cl therefore has the higher electronegativity.
- Mon Nov 30, 2020 10:26 am
- Forum: Properties of Light
- Topic: Study Advice
- Replies: 50
- Views: 2690
Re: Study Advice
I would recommend doing both. The textbook problems are extremely helpful, but I’ve found that supplementing these with attending the step up sessions is the best. It also depends on how you learn best
- Sun Nov 15, 2020 11:51 pm
- Forum: Significant Figures
- Topic: Sig Fig Question
- Replies: 12
- Views: 1068
Re: Sig Fig Question
For anyone on this thread,
we don't need to worry about Sig Figs for the midterm!!
we don't need to worry about Sig Figs for the midterm!!
- Sun Nov 15, 2020 11:50 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Spin State
- Replies: 8
- Views: 889
Re: Spin State
I don't think you will use it mathematically, but knowing how to find either the +1/2 or -1/2 spin state is important!
- Sun Nov 15, 2020 11:48 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3942242
Re: Post All Chemistry Jokes Here
What did one ion say to the other?
I've got my ion you.
I've got my ion you.
- Sun Nov 15, 2020 11:47 pm
- Forum: Resonance Structures
- Topic: bond length
- Replies: 37
- Views: 1930
Re: bond length
No! You just need to know the concepts. For example, multiple bonds have a shorter bond length. Weaker bonds are longer. Lone pairs on neighboring atoms also repel each other, which then in turn weakens the bond.
- Sun Nov 15, 2020 11:42 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Oxidation Number
- Replies: 8
- Views: 467
Re: Oxidation Number
I would think of it like this:
If you have the formula NO3-, and you are asked for the oxidation number of N.
You know the final charge is -1 and you know the oxidation number of O is -2. So -2 times 3 is -6 and so the oxidation of N would 5 in order to get you back to the final output of -1
If you have the formula NO3-, and you are asked for the oxidation number of N.
You know the final charge is -1 and you know the oxidation number of O is -2. So -2 times 3 is -6 and so the oxidation of N would 5 in order to get you back to the final output of -1
- Sun Nov 15, 2020 11:40 pm
- Forum: Lewis Structures
- Topic: Hydrogen Bonding
- Replies: 12
- Views: 662
Re: Hydrogen Bonding
This is because it needs to bond to something with a higher electronegativity rating like oxygen, nitrogen, or fluorine
- Sun Nov 15, 2020 11:39 pm
- Forum: Ionic & Covalent Bonds
- Topic: bond lengths
- Replies: 9
- Views: 586
Re: bond lengths
Double bonds are shorter because more bonding means more attraction. Therefore because double bonds have more bonds and more attraction, they are closer to each other with shorter bonds
- Mon Nov 09, 2020 10:48 am
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 643605
Re: Saying Thank You to Dr. Lavelle
Thank you Dr. Lavelle. You have seriously inspired me with your passion for chemistry, even despite the online environment. I appreciate you so much!!!
-Jacob Schwarz
-Jacob Schwarz
- Sun Nov 01, 2020 11:31 pm
- Forum: Photoelectric Effect
- Topic: Lyman Series
- Replies: 30
- Views: 1371
Re: Lyman Series
Yes, if they Lyman series is mentioned, you should assume n=1 as the final state.
- Sun Nov 01, 2020 11:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Participation Points [ENDORSED]
- Replies: 62
- Views: 4568
Re: Participation Points [ENDORSED]
Do the points get calculated weekly or once at the end of the quarter?
- Sun Nov 01, 2020 11:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Fall 2020 Midterm 1 Instructions
- Replies: 20
- Views: 2038
Re: Fall 2020 Midterm 1 Instructions
For the next midterm or the final, do I need to buy a webcam?
- Sun Nov 01, 2020 11:29 pm
- Forum: Einstein Equation
- Topic: E=hv vs E=hf
- Replies: 15
- Views: 946
Re: E=hv vs E=hf
They just don't want to confuse it with velocity so sometimes they use E=hf
- Sun Nov 01, 2020 11:28 pm
- Forum: Einstein Equation
- Topic: Solving Equations using E=hv
- Replies: 6
- Views: 1307
Re: Solving Equations using E=hv
You would solve normally using E=hv and then divide by Avogadro's constant
- Sun Nov 01, 2020 11:27 pm
- Forum: Einstein Equation
- Topic: Sapling #1
- Replies: 6
- Views: 1340
Re: Sapling #1
It's 100E because there are 100 photons-each photon adds more energy-therefore 100E
- Sun Nov 01, 2020 11:25 pm
- Forum: *Black Body Radiation
- Topic: Midterm 1
- Replies: 15
- Views: 1005
Re: Midterm 1
Dr. Lavelle said not to worry about it. It wasn't on my midterm and I believe he said it wouldn't be on any of them
- Sun Nov 01, 2020 11:24 pm
- Forum: DeBroglie Equation
- Topic: Diffraction Pattern
- Replies: 9
- Views: 471
Re: Diffraction Pattern
My interpretation was that a diffraction pattern is caused by waves!!!
- Sun Nov 01, 2020 11:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Sapling access code
- Replies: 3
- Views: 169
Re: Sapling access code
Where did you order it to? I ordered it to the Ackerman union and it worked for me.
- Sun Nov 01, 2020 11:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Saying Thank You to Dr. Lavelle
- Replies: 490
- Views: 643605
Re: Saying Thank You to Dr. Lavelle
Dr. Lavelle,
I know you have an insane amount of students and to make it even harder, you are in an online environment. I can't imagine how many emails and daily notifications you have to respond to. Yet, you always have a smile on your face. Just wanted to say thank you! Appreciate you Dr. Lavelle!!
I know you have an insane amount of students and to make it even harder, you are in an online environment. I can't imagine how many emails and daily notifications you have to respond to. Yet, you always have a smile on your face. Just wanted to say thank you! Appreciate you Dr. Lavelle!!
- Sun Nov 01, 2020 11:16 pm
- Forum: Properties of Light
- Topic: Study Advice
- Replies: 50
- Views: 2690
Re: Study Advice
It really depends. Doing the step up sessions have helped me to refine my skills but I usually already know the content. The more help and practice you do, the easier the midterms will be.
- Sun Nov 01, 2020 11:12 pm
- Forum: Properties of Light
- Topic: Speed of light
- Replies: 25
- Views: 990
Re: Speed of light
Lavelle is okay with 3*10^8! You don't need to worry about 2.999 he wants us to stick with 3 (: