Search found 101 matches
- Sat Mar 13, 2021 1:44 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat capacity
- Replies: 4
- Views: 322
Re: Heat capacity
You could also think of it as it would take more energy to break it's bonds in terms of heat capacity like changing it's state. The more complex it is the more heat is required to change its state.
- Sat Mar 13, 2021 1:42 am
- Forum: Balancing Redox Reactions
- Topic: Oxidation Numbers: Provided or memorize?
- Replies: 26
- Views: 1836
Re: Oxidation Numbers: Provided or memorize?
I don't think there's a need to memorize. Just know that group one elements are always +1 and Oxygen is -2 and you should be able to figure it out
- Sat Mar 13, 2021 1:40 am
- Forum: Student Social/Study Group
- Topic: Spring Quarter
- Replies: 60
- Views: 2849
Re: Spring Quarter
I took 14Bl this quarter with 14B. I'm taking 14C next quarter :)
- Sat Mar 13, 2021 1:38 am
- Forum: Student Social/Study Group
- Topic: Distractions
- Replies: 15
- Views: 847
Re: Distractions
I think a lot of us feel pretty burnt out as well and at this point are just trying to get through finals. There's so much going on and I've found talking to other people and finding that they feel the same has helped me feel less alone and less panicked.
- Sat Mar 13, 2021 1:38 am
- Forum: Student Social/Study Group
- Topic: Distractions
- Replies: 15
- Views: 847
Re: Distractions
I think a lot of us feel pretty burnt out as well and at this point are just trying to get through finals. There's so much going on and I've found talking to other people and finding that they feel the same has helped me feel less alone and less panicked.
- Sat Mar 13, 2021 1:36 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Catalyst and exo vs endothermic reactions
- Replies: 7
- Views: 540
Re: Catalyst and exo vs endothermic reactions
Catalysts decrease the activation energy and so if you look at the nerst equation if the activation energy decreases then rate (k) increases. But it shouldn't affect the equilibrium
- Sun Mar 07, 2021 11:01 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy and Enthalpy
- Replies: 4
- Views: 2699
Re: Activation Energy and Enthalpy
Also activation energy is really just the energy required for the reaction to actually occur and it can be manipulated so that it is faster or slower (such as use of catalysts/ enzymes) meanwhile enthalpy of a reaction is not related to its speed or reaction time.
- Sun Mar 07, 2021 10:58 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Electrochemistry
- Replies: 9
- Views: 558
Electrochemistry
What are all the equations that we are responsible for in electrochemistry? That section I feel like we breezed through just because it overlapped with midterm 2.
- Sun Mar 07, 2021 9:59 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Multiple Eº & textbook #6.45
- Replies: 2
- Views: 158
Re: Multiple Eº & textbook #6.45
I'm not too sure to be honest, but we wouldn't need to worry about it for the exam because we will be given the correct E* values to use. Maybe someone else has a better response though :/
- Sat Mar 06, 2021 7:45 pm
- Forum: General Rate Laws
- Topic: Integrated Rate Law
- Replies: 7
- Views: 405
Re: Integrated Rate Law
If the product is not removed or is in a different phase then due to equilibrium the reaction could shift from products to reactant but we only want to look at the forward reaction which is why we need to remove the product so the reaction does not shift to products forming reactants.
- Tue Mar 02, 2021 11:19 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Concentration Cells
- Replies: 2
- Views: 153
Concentration Cells
Why is E* always = 0V in concentration cells?
- Sun Feb 28, 2021 2:22 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: HW Question
- Replies: 4
- Views: 314
Re: HW Question
Why do we assume E* is 0?
- Sun Feb 28, 2021 2:19 pm
- Forum: General Science Questions
- Topic: Midterm 2 Reactions
- Replies: 79
- Views: 4772
Re: Midterm 2 Reactions
I thought I did better than what my grade turned out to be. Probably need to focus on more concepts when studying for the final.
- Sun Feb 28, 2021 2:16 pm
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 63
- Views: 2904
Re: Final
I honestly have been wondering about how to best approach studying for the final. I think reviewing the concepts and redoing the problems in sapling because they have explanations would be helpful. And doing the outlines afterwards would solidify any hardships
- Sun Feb 28, 2021 2:12 pm
- Forum: Balancing Redox Reactions
- Topic: oxidation states for final?
- Replies: 13
- Views: 634
Re: oxidation states for final?
As everyone said, Lavelle doesn't usually want us to memorize things, so most oxidation stuff we'll be able to figure out.
- Sun Feb 28, 2021 1:59 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing with H2O/OH-
- Replies: 6
- Views: 291
Re: Balancing with H2O/OH-
When do we use OH- vs H2O ?
- Sun Feb 21, 2021 12:36 am
- Forum: Student Social/Study Group
- Topic: Classes for next quarter?
- Replies: 165
- Views: 12163
Re: Classes for next quarter?
Im taking 14C and stats 13
Does anyone have any recommended courses for writing 2 course?
Does anyone have any recommended courses for writing 2 course?
- Wed Feb 17, 2021 2:02 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Equations for enthalpy
- Replies: 2
- Views: 202
Equations for enthalpy
What are all version of enthalpy (delta H) equations we need to know at the different conditions? constant P, constant V, etc...
- Sun Feb 14, 2021 4:45 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: delta G
- Replies: 9
- Views: 474
delta G
What is the difference between delta G and delta G knot
- Sun Feb 14, 2021 4:43 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: chem community points
- Replies: 7
- Views: 340
Re: chem community points
Thank you all, that's very helpful
- Wed Feb 10, 2021 1:25 am
- Forum: Calculating Work of Expansion
- Topic: Reversible vs irreversible [ENDORSED]
- Replies: 3
- Views: 285
Reversible vs irreversible [ENDORSED]
I'm really confused regarding the concepts behind reversible and irreversible expansions. Will we always view them as a piston problem (which is how professor Lavelle discusses them)? And what is reversible vs irreversible?
- Sun Feb 07, 2021 10:42 pm
- Forum: Student Social/Study Group
- Topic: Midterm 2 Material
- Replies: 2
- Views: 157
Re: Midterm 2 Material
I think it will include everything up until Friday of week 6, but professor Lavelle usually sends out an email the week before explaining exactly which material we are responsible for.
- Sun Feb 07, 2021 10:40 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic v. Exothermic
- Replies: 139
- Views: 9243
Re: Endothermic v. Exothermic
Endothermic means energy went into the system which means delta H increased so it has to be positive. And the opposite is also true.
- Sun Feb 07, 2021 10:39 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed System
- Replies: 52
- Views: 2476
Re: Closed System
Energy can be exchanged but matter can not
- Sun Feb 07, 2021 10:38 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: chem community points
- Replies: 7
- Views: 340
chem community points
Does anyone know how many posts we are supposed to have? I lost track during the craziness of the midterm
- Sun Feb 07, 2021 10:36 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Entropy
- Replies: 27
- Views: 1000
Re: Entropy
It's a measure of chaos of a system or of the surrounding. We usually look at it as entropy increased in the system vs the surroundings
- Sun Feb 07, 2021 10:33 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: What is residual entropy?
- Replies: 16
- Views: 4746
Re: What is residual entropy?
At 0 Kelvin it is thought that there was no energy at all or "absolute zero" but residual entropy still occurs because of the different forms the atoms can arrange themselves in a molecule.
- Sun Feb 07, 2021 10:32 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: R constants
- Replies: 40
- Views: 2001
Re: R constants
As everyone said, I would look at the units you are given and the units you are trying to reach and choose the one the fits where you can cancel out the units u don't want in the final answer
- Sun Feb 07, 2021 10:31 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Study Approach thermodynamics
- Replies: 8
- Views: 351
Study Approach thermodynamics
I feel like this section is a lot more challenging because it's a little difficult to know how to start every problem. Any tips?
- Sun Feb 07, 2021 10:29 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Vocab. in thermodynamics
- Replies: 8
- Views: 283
Re: Vocab. in thermodynamics
If prof. Lavelle mentions them in lecture then they are fair game
- Tue Feb 02, 2021 3:01 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Calorimeter
- Replies: 4
- Views: 134
Calorimeter
How does a calorimeter work?
- Sun Jan 31, 2021 2:28 pm
- Forum: Phase Changes & Related Calculations
- Topic: when to assume x is insignificant
- Replies: 86
- Views: 6271
Re: when to assume x is insignificant
It's usually when k is less than 10^-3 but you have to check the percent ionization by diving x by the initial concentration and see if it is less than 5%. Usually when k is super small, it is very likely you can approximate.
- Thu Jan 28, 2021 10:35 pm
- Forum: Phase Changes & Related Calculations
- Topic: Heat vs Enthalpy State property?
- Replies: 5
- Views: 239
Re: Heat vs Enthalpy State property?
Enthalpy is the change in heat of a system at constant pressure. So we can use Final - Initial which is a state function. Heat is energy transferred due to a temperature system so it depends on the path not just Final - initial so it's not a state property. Hope this helps, I was also confused by th...
- Wed Jan 27, 2021 10:22 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: textbook 6B.3
- Replies: 1
- Views: 60
textbook 6B.3
How do we do this problem?
A careless laboratory technician wants to prepare 200.0 mL of a 0.025 M HCl(aq) solution but uses a volumetric flask of volume 250.0 mL by mistake. (a) What would the pH of the desired solution have been? (b) What will be the actual pH of the solution as prepared?
A careless laboratory technician wants to prepare 200.0 mL of a 0.025 M HCl(aq) solution but uses a volumetric flask of volume 250.0 mL by mistake. (a) What would the pH of the desired solution have been? (b) What will be the actual pH of the solution as prepared?
- Wed Jan 27, 2021 8:46 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Textbook 5.61
- Replies: 1
- Views: 68
Textbook 5.61
6CO2(g) + 6H2O(l) → C6H12O6(aq) + 6O2 (g)
What is the effect of adding more water? I know that liquid should not affect the equilibrium composition but since glucose is aqueous wouldn't it's concentration decrease because it will become more diluted?
What is the effect of adding more water? I know that liquid should not affect the equilibrium composition but since glucose is aqueous wouldn't it's concentration decrease because it will become more diluted?
- Wed Jan 27, 2021 7:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: partial pressure units
- Replies: 3
- Views: 97
partial pressure units
When calculating the K value and when setting up an ice table, what should our units be if we're calculating partial pressure.
- Sun Jan 24, 2021 10:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5I.21 Cubic Equation
- Replies: 1
- Views: 133
Re: 5I.21 Cubic Equation
One of the UA's said that Lavelle stated that we didn't need to worry about solving anything past a quadratic for the midterm :)
- Sun Jan 24, 2021 10:54 pm
- Forum: Student Social/Study Group
- Topic: Average amount of study hours per week
- Replies: 28
- Views: 1058
Re: Average amount of study hours per week
I try to go to at least 3 or 4 UA sessions per week, and then sapling and textbook homework... So 10 -12 hours I would say? I also have other classes and I'm working so i understand the struggle. Going to UA sessions as study time, is very efficient and helpful cause they reinforce stuff we are supp...
- Sun Jan 24, 2021 10:51 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Pka, Ph, charged and neutral species
- Replies: 7
- Views: 353
Re: Pka, Ph, charged and neutral species
Yes that's correct, there is also a really helpful diagram in one of the lectures or textbooks!
- Sun Jan 24, 2021 10:49 pm
- Forum: Student Social/Study Group
- Topic: Midterm Study Tips
- Replies: 41
- Views: 1496
Re: Midterm Study Tips
I recommend trying to finish all the textbook problems a few days before the exam so you can attend UA sessions and ask questions and figure out what you don't know yet.
- Sun Jan 24, 2021 12:38 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Qudratic Formula
- Replies: 19
- Views: 852
Re: Qudratic Formula
You can also try graphing the equation, and calculating where the x-intercepts are if you have a graphing calculator.
- Sun Jan 17, 2021 2:16 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: q vs k
- Replies: 62
- Views: 2319
Re: q vs k
Q calculates the ratio of products to reactants at anyone point not just equilibrium.
- Sun Jan 17, 2021 2:14 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ka vs kb
- Replies: 20
- Views: 441
Re: ka vs kb
Adding on to what everyone said. You are able to use ka to find kb because pka+pkb= 14 and ka + kb= 10^-14.
- Sun Jan 17, 2021 2:12 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H2O as a Gas
- Replies: 69
- Views: 6051
Re: H2O as a Gas
We only exclude solids and liquids. We usually exclude H2O because it is almost always the solvent, but since it is a gas it will be involved in the reaction and is, therefore, include in the k constant.
- Fri Jan 15, 2021 1:49 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: acid base problems
- Replies: 3
- Views: 84
Re: acid base problems
And to clarify, should we use 10^-3 or 10^-4 as the threshold to when we can ignore the +/- x to avoid a quadratic equation? Lavelle has mentioned both.
- Fri Jan 15, 2021 1:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: acid base problems
- Replies: 3
- Views: 84
acid base problems
Will we be expected to figure out the formulas for the reactions on the exams, or will they be given?
- Sat Jan 09, 2021 10:59 pm
- Forum: Ideal Gases
- Topic: Reviewing PV=NRT
- Replies: 7
- Views: 319
Re: Reviewing PV=NRT
When you go to saplings there is a link for atkins without the picture of the book itself and it's a pdf with all the answers
- Sat Jan 09, 2021 10:58 pm
- Forum: Ideal Gases
- Topic: R constant
- Replies: 4
- Views: 214
Re: R constant
You should use it when you need to convert from pressure to concentration and vice versa and find the R constant that cancels out the proper units.
- Sat Jan 09, 2021 10:55 pm
- Forum: Ideal Gases
- Topic: reversing reactions
- Replies: 83
- Views: 4720
Re: reversing reactions
Reversing the reaction flips all Reactants to products and vice versa, thus when u are calculating K the top and bottom are flipped which is why we put 1/k when we reverse the reaction.
- Sat Jan 09, 2021 10:49 pm
- Forum: Ideal Gases
- Topic: Units of Temperature
- Replies: 82
- Views: 3215
Re: Units of Temperature
Kelvin is used because it has a bigger and more applicable range for the chemicals we are experimenting with
- Sat Jan 09, 2021 10:47 pm
- Forum: Ideal Gases
- Topic: Kc vs Kp
- Replies: 109
- Views: 4273
Re: Kc vs Kp
if they are all gases, you would most likely use Kp because gases aren't usually given in concentration. It also depends on the units you are given, so if you are given a value in concentration, you can convert everything to mol/l using the ideal gas equation PV=nRT
- Sat Dec 12, 2020 4:02 pm
- Forum: Bronsted Acids & Bases
- Topic: SO3 lewis acid/bronsted
- Replies: 2
- Views: 1703
SO3 lewis acid/bronsted
I'm a little confused with SO3. I know it is a lewis acid because it can accept lone pairs but what kind of bronsted acid/base is it. Because it can accept H+ protons right? So shouldn't it be a bronsted base? Also can it also donate lone pairs and act as a lewis base? I'm confusing myself :(
- Sat Dec 12, 2020 4:17 am
- Forum: Hybridization
- Topic: Textbook 2F.15: s-character and bond angle
- Replies: 4
- Views: 238
Re: Textbook 2F.15: s-character and bond angle
would an explanation be that s orbital is lower energy than p orbital so if s character of the hybrids increased then the energy would decrease meaning a decrease of electron density or the space the electron occupies has decreased causing an increase in bond angles?
- Sat Dec 12, 2020 4:14 am
- Forum: Hybridization
- Topic: Textbook 2F.15: s-character and bond angle
- Replies: 4
- Views: 238
Re: Textbook 2F.15: s-character and bond angle
What is meant by s and p character?
- Tue Dec 08, 2020 8:01 pm
- Forum: Bronsted Acids & Bases
- Topic: Acid strength through bonds
- Replies: 6
- Views: 249
Acid strength through bonds
So just to clarify, the bigger the atom, the longer the bond, the more easily that bond is broken, so the stronger the acid? For example, HBr is stronger than HCl because Br is bigger than Cl?
- Tue Dec 08, 2020 4:14 pm
- Forum: Biological Examples
- Topic: porphyrin ligand in biological example
- Replies: 3
- Views: 203
Re: porphyrin ligand in biological example
I was literally about to come and ask that exact question. Thank you for the explanation!
- Sun Dec 06, 2020 11:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Memorization for final
- Replies: 9
- Views: 396
Re: Memorization for final
What are the best methods to memorize all of this do u guys think?
- Sun Dec 06, 2020 4:51 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Memorization for final
- Replies: 9
- Views: 396
Memorization for final
What are all content we should have memorized for the final just so we have a list to go off of.
- Sun Dec 06, 2020 4:42 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lectures not loading
- Replies: 13
- Views: 659
Re: Lectures not loading
I hope they are fixed soon as well. But I'm glad that the issue isn't from my end. Thank you
- Sun Dec 06, 2020 3:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lectures not loading
- Replies: 13
- Views: 659
Lectures not loading
Does anyone know who to reach out to because many of us are having difficulty watching the lectures through bruincast on ccle. They are not loading. It says error cannot load video. I even tried connecting to the ucla VPN and it still hasn't worked
- Wed Dec 02, 2020 1:58 pm
- Forum: Lewis Structures
- Topic: Lone Pair placement
- Replies: 10
- Views: 570
Lone Pair placement
Why is it okay for the lone pairs to be drawn next to each other in H20 but they have to be opposite each other in XeF4
- Sun Nov 29, 2020 10:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pair E-
- Replies: 47
- Views: 1740
Re: Lone Pair E-
Lone pairs have their own electrical density kind of like a bubble around them that causes repulsion
- Sun Nov 29, 2020 10:53 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 12
- Views: 479
Re: Sig Figs
We don't really need sig figs currently because it is multiple-choice, but it is helpful to know for the future
- Sun Nov 29, 2020 10:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Equatorial/ Axial Planes
- Replies: 14
- Views: 784
Re: Equatorial/ Axial Planes
Equatorial is kind of like the equator of the earth so it would help you visualize that they are the bonds on the horizal planes and axial are like the axis of the earth
- Sun Nov 29, 2020 10:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Shape Names
- Replies: 50
- Views: 2236
Re: Shape Names
It would be considered bent
- Sun Nov 29, 2020 10:48 pm
- Forum: Student Social/Study Group
- Topic: Tips for Staying Focused
- Replies: 64
- Views: 3489
Re: Tips for Staying Focused
Try to plan one day where you don't do anything school-related so you feel refreshed and ready to work throughout the week
- Sun Nov 29, 2020 10:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance Structure Definition
- Replies: 9
- Views: 463
Re: Resonance Structure Definition
Whenever there is more than one way to draw a structure by moving around the bonds, we have resonance
- Sun Nov 29, 2020 10:18 pm
- Forum: Student Social/Study Group
- Topic: Tips for Staying Focused
- Replies: 64
- Views: 3489
Re: Tips for Staying Focused
I honestly feel like it's best to write down everything you need to do for the week for all your classes and things you need to do outside of school. Writing them down makes you feel less overwhelmed and more motivated to finished one thing at a time. It helps focus your mind
- Sun Nov 29, 2020 10:07 pm
- Forum: Sigma & Pi Bonds
- Topic: Sapling Q #16
- Replies: 14
- Views: 799
Re: Sapling Q #16
After drawing the lewis structures, see which ones have resonance and those will be the ones that are delocalized.
- Sun Nov 29, 2020 4:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Required knowledge for test/midterm [ENDORSED]
- Replies: 17
- Views: 1286
Re: Required knowledge for test/midterm [ENDORSED]
Does anyone know if we can view the questions we got wrong on the midterm?
- Fri Nov 20, 2020 12:59 am
- Forum: Lewis Structures
- Topic: Ionic Lewis Structures
- Replies: 2
- Views: 155
Re: Ionic Lewis Structures
Is there a specific way to draw the lewis structures for ionic compounds instead of covalent?
- Sat Nov 14, 2020 11:35 pm
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 19
- Views: 624
Re: Resonance
Ahh yes that makes a lot more sense thank you
- Sat Nov 14, 2020 10:14 pm
- Forum: Lewis Structures
- Topic: dipole dipole intermolecular forces
- Replies: 4
- Views: 238
dipole dipole intermolecular forces
How can we compare or determine the strength of a dipole - dipole intermolecular force
- Sat Nov 14, 2020 9:38 pm
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 19
- Views: 624
Re: Resonance
also why are resonance structures more stable?
- Sat Nov 14, 2020 9:16 pm
- Forum: Resonance Structures
- Topic: Resonance
- Replies: 19
- Views: 624
Re: Resonance
What is x-ray diffraction again?
- Wed Nov 11, 2020 9:56 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm 2
- Replies: 6
- Views: 321
Midterm 2
Hey everyone, did professor Lavelle specify the cut off for the material on midterm 2?
- Sun Nov 08, 2020 2:22 pm
- Forum: Electronegativity
- Topic: Atom size
- Replies: 22
- Views: 3072
Re: Atom size
"Electronegativity is the tendency of the atoms of an element to attract electrons when they are chemically combined with another element." So electronegativity deals with electrons from other atoms and not itself which is why it doesn't affect atom size. But as the rest of the posts said ...
- Sun Nov 08, 2020 2:17 pm
- Forum: Lewis Structures
- Topic: Lone Pairs Question
- Replies: 22
- Views: 1528
Re: Lone Pairs Question
Adding on to the rest of the posts, Lone pairs do not participate in bonding like everyone is saying but also they will help you keep count of all valence electrons. They are basically the valence electrons that aren't bonded with another element.
- Sun Nov 08, 2020 2:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14BL?
- Replies: 7
- Views: 347
Re: Chem 14BL?
My friend is currently taking chem 14B and 14BL together and she said it was very doable. But when you are enrolling you have to enroll in 14B in ur first pass and 14BL in ur second pass for it to let you enroll.
- Sun Nov 08, 2020 2:14 pm
- Forum: Properties of Light
- Topic: Study Advice
- Replies: 50
- Views: 2006
Re: Study Advice
In my opinion, going to step-up sessions, workshops is in itself self-study and preparing for the exam because that is where you will probably find out what you don't know as well as where you commonly make mistakes. I highly recommend going to at least 1 or 2 per week.
- Sun Nov 08, 2020 2:08 pm
- Forum: Octet Exceptions
- Topic: Octet rule
- Replies: 9
- Views: 549
Re: Octet rule
The exceptions H, He, Li, Be are exceptions because they tend to gain an electron or lose electrons to reach the s subshell meaning they are going to usually have 2 electrons in their outermost shell instead of the 8 which is what the octet rule suggests.
- Sun Nov 01, 2020 7:59 pm
- Forum: Properties of Light
- Topic: Midterm Question
- Replies: 11
- Views: 528
Re: Midterm Question
We don't need to do any problems from section topic 1C right?
- Sun Nov 01, 2020 7:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 158904
Re: How to find my posts
Has anyone experienced an issue with the number of the posts it says we posted on the right? Because everytime I post it says its one post greater than how many I've actually posted
- Thu Oct 29, 2020 2:55 pm
- Forum: Properties of Electrons
- Topic: Absorption and emission spectrum
- Replies: 4
- Views: 137
Re: Absorption and emission spectrum
For the equation En= -hR/n^2 does the En represent the energy of an electron at the n energy level? and would that be equal to the energy of the light that excited that electron?
- Thu Oct 29, 2020 12:21 am
- Forum: Properties of Light
- Topic: Midterm Question
- Replies: 11
- Views: 528
Re: Midterm Question
Do we need to know atomic and ionic radius trends for the midterm?
- Wed Oct 28, 2020 3:53 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation Confusion
- Replies: 9
- Views: 8819
Re: Rydberg Equation Confusion
so is n1 actually n final? and n2 n intial?
- Mon Oct 26, 2020 12:53 am
- Forum: Significant Figures
- Topic: sig fig
- Replies: 20
- Views: 908
Re: sig fig
Do you guys think we need sig figs since it's a multiple choice exam for this midterm
- Sun Oct 25, 2020 4:52 pm
- Forum: Properties of Light
- Topic: Electric Field (visualization)
- Replies: 2
- Views: 56
Re: Electric Field (visualization)
Light is a form of electromagnetic radiation, which consists of oscillating electric and magnetic fields that travel through empty space. As a light ray passes an electron (charged particle), its electric field pushes the electron first in one direction and then the opposite direction repeatedly, m...
- Sun Oct 25, 2020 2:19 pm
- Forum: Properties of Light
- Topic: Electric Field (visualization)
- Replies: 2
- Views: 56
Electric Field (visualization)
What does it mean that an electric field pushes on charged particles causing them to oscillate? Like what does that apply to in what we have learned so far?
- Wed Oct 21, 2020 2:14 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 11
- Views: 210
Re: Rydberg Equation
does anyone know what equations/values we should have memorized that aren't on the equation sheet?
- Wed Oct 21, 2020 1:09 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg Equation
- Replies: 11
- Views: 210
Re: Rydberg Equation
How do we derive the Rydberg equation?
- Sat Oct 17, 2020 12:31 am
- Forum: Administrative Questions and Class Announcements
- Topic: Built-in webcams/Equipment request [ENDORSED]
- Replies: 22
- Views: 1403
Re: Built-in webcams/Equipment request [ENDORSED]
You definitely don't need to buy an external webcam. You can use ur phone to zoom and that will show ur workspace. It would be difficult to use ur computer webcam because you will be taking the exam on the computer and so you can't bend the laptop to show your workspace at the same time.
- Sat Oct 17, 2020 12:26 am
- Forum: Photoelectric Effect
- Topic: Sapling homework
- Replies: 2
- Views: 99
Sapling homework
Just to clarify, the homeworks on sapling for week 2-4 are due week 4?
- Tue Oct 13, 2020 11:31 pm
- Forum: SI Units, Unit Conversions
- Topic: Nomenclature
- Replies: 7
- Views: 285
Re: Nomenclature
That's very reassuring thank you! I personally read through that chapter in the textbook and I know the basics of everything just don't have some memorized so I'm glad professor Lavelle isn't focused on us memorizing things.
- Tue Oct 13, 2020 10:46 am
- Forum: SI Units, Unit Conversions
- Topic: Nomenclature
- Replies: 7
- Views: 285
Nomenclature
How well do you guys think we should know all the nomenclature? Did you guys read through that chapter in sapling or take notes and flashcards and such?
- Mon Oct 12, 2020 3:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chemistry Discussion
- Replies: 6
- Views: 375
Re: Chemistry Discussion
Has anyone attended Dr. Lavell's office hours on Monday or Wednesday? Because I'm trying to join but I'm just stuck in the waiting room for quite a while. How do they work? Are we supposed to wait our turn or is it a discussion for everyone?
- Fri Oct 09, 2020 4:03 am
- Forum: Student Social/Study Group
- Topic: Sapling Week One Homework Question
- Replies: 9
- Views: 282
Re: Sapling Week One Homework Question
Are we able to redo the homework problems in sapling? Like are we given multiple tries?
- Fri Oct 09, 2020 4:01 am
- Forum: General Science Questions
- Topic: Workshops
- Replies: 2
- Views: 223
Workshops
Has anyone been to a workshop for this week? How are they structured? Like do we have worksheets to complete and like new problems or do have to bring our own question for it to be answered?
- Fri Oct 09, 2020 3:59 am
- Forum: Administrative Questions and Class Announcements
- Topic: Step Up Sessions
- Replies: 71
- Views: 6479
Re: Step Up Sessions
Where can I find the schedule and the zoom links for the step up sessions?
- Thu Oct 08, 2020 1:41 am
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 144053
Re: Reading the textbook
Also are you guys reading all the fundamentals or only the ones recommended in the syllabus?