Search found 135 matches
- Sun Mar 13, 2022 10:57 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics vs thermodynamics?
- Replies: 9
- Views: 349
Re: Kinetics vs thermodynamics?
The main difference is that kinetics deals with how fast a reaction occurs (how fast reactions are used vs. how fast products are formed), while thermodynamics deals with how stable substances are in various states (gas, liquid, solid), and changes between those states.
- Sun Mar 13, 2022 10:53 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: fast and slow steps
- Replies: 29
- Views: 769
Re: fast and slow steps
For problems that we're given, I would expect that it would be given whether or not a reaction is fast or slow.
- Sun Mar 13, 2022 10:52 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Reaction Intermediate
- Replies: 12
- Views: 698
Re: Reaction Intermediate
A reaction intermediate refers to a product that is formed during an elementary reaction that is used as a reactant in a subsequent elementary reaction. This substance will not appear in the overall chemical reaction, and is therefore referred to as an intermediate.
- Sun Mar 13, 2022 10:51 pm
- Forum: Second Order Reactions
- Topic: overall order
- Replies: 11
- Views: 401
Re: overall order
Overall order is important because it tells us how each reactant impacts the speed of the overall reaction, while it also tells us what units the k will be.
- Sun Mar 06, 2022 11:45 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: What is K
- Replies: 59
- Views: 1427
Re: What is K
The constant K refers to the rate constant, which is constant for a given temperature.
- Sun Mar 06, 2022 11:44 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Kelvin or Celsius
- Replies: 41
- Views: 1117
Re: Kelvin or Celsius
It mostly depends on what units are stated within the problem, although I'd say converting to Kelvins is generally the safer option.
- Sun Mar 06, 2022 11:36 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: k
- Replies: 29
- Views: 878
Re: k
Temperature do impact the value of k, although the way in which it is affected depending on whether the reaction is exothermic or endothermic.
- Sun Mar 06, 2022 11:33 pm
- Forum: First Order Reactions
- Topic: slope
- Replies: 56
- Views: 1928
Re: slope
Given the y=mx+b format for the first order reaction, the slope would be -k.
- Sun Mar 06, 2022 11:31 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Checking-In :)
- Replies: 34
- Views: 1051
Re: Checking-In :)
Could've definitely went better, and the online format for the first few weeks definitely had an impact on my performance. But as long as I finish strong I should be alright.
- Sun Feb 27, 2022 11:59 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2988112
Re: Post All Chemistry Jokes Here
I'm honestly feeling a little out of my element with chemistry.
- Sun Feb 27, 2022 11:58 pm
- Forum: Balancing Redox Reactions
- Topic: anode vs cathode
- Replies: 77
- Views: 2063
Re: anode vs cathode
The half reaction that's being reduced is the cathode, while the half reaction being oxidized is the anode.
- Sun Feb 27, 2022 11:56 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Finding n
- Replies: 50
- Views: 1419
Re: Finding n
After balancing both sides of the equation, the number of electrons transferred will be the value of n.
- Sun Feb 27, 2022 11:54 pm
- Forum: Phase Changes & Related Calculations
- Topic: delta H
- Replies: 98
- Views: 4449
Re: delta H
delta H refers to change in heat, meaning that a negative value correlates to a decrease in heat, while a positive value correlates to an increase in heat.
- Sun Feb 27, 2022 11:53 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: What does "n" stand for
- Replies: 78
- Views: 3571
Re: What does "n" stand for
n just stands for the number of moles in the equation
- Mon Feb 21, 2022 12:02 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy
- Replies: 9
- Views: 280
Re: Gibbs Free Energy
Gibbs free energy refers to the total amount of energy in a system that is available to do work.
- Mon Feb 21, 2022 12:02 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy
- Replies: 9
- Views: 280
Re: Gibbs Free Energy
Gibbs free energy refers to the total amount of energy in a system that is available to do work.
- Sun Feb 20, 2022 11:59 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: which gas constant
- Replies: 21
- Views: 697
Re: which gas constant
You just need to pay attention to units to choose which gas constant, typically 8.314 for kPA and atm.
- Sun Feb 20, 2022 11:59 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Does ∆S or ∆G determine spontaneity?
- Replies: 10
- Views: 898
Re: Does ∆S or ∆G determine spontaneity?
Delta G, which deals with free energy, is the value that directly deals with spontaneity. Technically delta S can be a factor as well, as delta S can be used to calculate delta G
- Sun Feb 20, 2022 11:57 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Why is -∆G spontaneous?
- Replies: 3
- Views: 185
Re: Why is -∆G spontaneous?
Delta G is spontaneous because the free energy of the products is less than that of the reactants. This means that no energy input is needed for the reaction to progress, which fits the definition of a spontaneous reaction.
- Sun Feb 20, 2022 11:56 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 18
- Views: 1197
Re: Hess's Law
Hess's Law basically states that, for a given set of chemical reactions that are to be combined, the entropy and enthalpy of the combined chemical reaction is given by the sum of each of the individual chemical reaction's entropy and enthalpy. There are a number of rules that come with Hess's law as...
- Sun Feb 13, 2022 10:43 pm
- Forum: General Science Questions
- Topic: Next Midterm [ENDORSED]
- Replies: 6
- Views: 384
Re: Next Midterm [ENDORSED]
Nice to know the midterm's going to be online with everything that's going on right now.
- Sun Feb 13, 2022 10:40 pm
- Forum: Student Social/Study Group
- Topic: chem next quarter
- Replies: 11
- Views: 567
Re: chem next quarter
Planning on just doing 14c, doing ochem while doing lab is not looking like something I can handle.
- Sun Feb 13, 2022 10:37 pm
- Forum: General Science Questions
- Topic: Grades
- Replies: 9
- Views: 404
Re: Grades
Based on the syllabus, only a 50% in points is required to pass the class.
- Sun Feb 13, 2022 10:18 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed system
- Replies: 53
- Views: 1470
Re: Closed system
A closed system is a type of system in which energy can be transferred into or out of it, but matter cannot.
- Sun Feb 06, 2022 11:49 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: definition
- Replies: 14
- Views: 447
Re: definition
The third law of thermodynamics is that, as temperature approaches 0 degrees K, or absolute zero, entropy approaches a specific constant value. This entropy value is typically zero, but does depend on the number of microstates.
- Sun Feb 06, 2022 11:45 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: open system
- Replies: 65
- Views: 1727
Re: open system
An open system is a type of system that can interact (that is, exchange energy/matter) with the surrounding environment. As such, the initial matter or energy in the system may change, as the surroundings may either give or receive matter/energy to/from the open system.
- Sun Feb 06, 2022 11:37 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Midterm 1 knowledge
- Replies: 8
- Views: 286
Re: Midterm 1 knowledge
Since those are in outline 4, we won't be needing that information for midterm 1
- Sun Feb 06, 2022 11:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Changes Constant Temperature
- Replies: 15
- Views: 493
Re: Phase Changes Constant Temperature
The reason that "temperature stays the same" is that a certain amount of energy is needed to conduct a phase change in the first place. For example, x amount of energy or heat is needed to change water from a solid to a liquid. Until that x amount of energy is reached, the solid water will...
- Sun Jan 30, 2022 11:18 pm
- Forum: Phase Changes & Related Calculations
- Topic: Baking a Cake
- Replies: 41
- Views: 2991
Re: Baking a Cake
Heat is added to the cake so that it can be baked, as heat is provided by the oven to be "absorbed" in the cake "reaction". As such, the cake can be classified as endothermic.
- Sun Jan 30, 2022 11:12 pm
- Forum: Phase Changes & Related Calculations
- Topic: Exothermic Vs. Endothermic
- Replies: 74
- Views: 3283
Re: Exothermic Vs. Endothermic
For me, an exothermic reaction means heat exits the reaction, meaning it is released. Thus, change in H is positive.
On the other hand, endothermic means heat enters the reaction, meaning heat is absorbed. Thus, change in H is negative.
On the other hand, endothermic means heat enters the reaction, meaning heat is absorbed. Thus, change in H is negative.
- Sun Jan 30, 2022 11:09 pm
- Forum: General Science Questions
- Topic: Midterm 1 Content
- Replies: 11
- Views: 550
Re: Midterm 1 Content
There should be an exam page of Doctor Lavelle's website that details midterm informayion, but the first midterm should cover all of outlines 1 to 3.
- Sun Jan 30, 2022 11:07 pm
- Forum: General Science Questions
- Topic: Online or in person?
- Replies: 7
- Views: 279
Re: Online or in person?
The option to go in person will probably be offered by week 7, but I think it'd be safe to assume all lectures would be recorded for those who can't attend meetings for safety concerns.
- Sun Jan 30, 2022 11:05 pm
- Forum: Phase Changes & Related Calculations
- Topic: Midterm 1 Respondus Question
- Replies: 43
- Views: 1494
Re: Midterm 1 Respondus Question
I got the same answer as well!
- Sun Jan 23, 2022 11:43 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH+pOH = 14
- Replies: 9
- Views: 514
Re: pH+pOH = 14
This equation/relationship always hold true for reactions in water at 25 degrees celsius, but can be different at other temperatures.
- Sun Jan 23, 2022 11:41 pm
- Forum: Phase Changes & Related Calculations
- Topic: freezing
- Replies: 70
- Views: 2461
Re: freezing
Freezing is an exothermic process, as the phase change from a liquid to a solid involves the formation of more bonds. The formation of bonds releases energy/heat, and as such is an exothermic process.
- Sun Jan 23, 2022 11:38 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Monoprotic?
- Replies: 47
- Views: 1040
Re: Monoprotic?
A monoprotic acid is an acid that only has one acid that it can give off.
- Sun Jan 23, 2022 11:36 pm
- Forum: Student Social/Study Group
- Topic: Upcoming Midterm
- Replies: 9
- Views: 471
Re: Upcoming Midterm
Going through a good amount of the textbook problems would probably be a good idea, considering that some of the problems on the midterm are going to be directly lifted from those questions. In addition, going to step-up session or TA office hours to go over any concepts that you aren't 100% confide...
- Sun Jan 23, 2022 11:33 pm
- Forum: Student Social/Study Group
- Topic: New Chill Music :)
- Replies: 52
- Views: 2600
Re: New Chill Music :)
Pretty into songs by Shiloh Dynasty or sagun myself, typical lo-fi type music.
- Sun Jan 16, 2022 11:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Lecture Slides Posting
- Replies: 5
- Views: 220
Re: Lecture Slides Posting
Professor Lavelle didn't post any lecture slides last quarter for CHEM 14A, so I probably would expect the same for this class.
- Sun Jan 16, 2022 11:49 pm
- Forum: Student Social/Study Group
- Topic: Study tips
- Replies: 5
- Views: 299
Re: Study tips
I would try going to the step up sessions or peer review sessions to go over all of the topics that are on the midterm. You can go onto the exam schedule link on Professor Lavelle's CHEM 14B website to see what specifically is going to be on each exam
- Sun Jan 16, 2022 11:42 pm
- Forum: General Science Questions
- Topic: Midterm 1
- Replies: 2
- Views: 141
Re: Midterm 1
Our first midterm is going to be on February 2nd, and you can look at more detailed exam information on the Exam Schedule link that's on professor Lavelle's CHEM 14B website.
- Sun Jan 16, 2022 11:37 pm
- Forum: General Science Questions
- Topic: Exam Format
- Replies: 16
- Views: 569
Re: Exam Format
From what I've heard from other people who've taken this course, the exam format would be similar to CHEM 14A, meaning proctored online exams taken via Respondus.
- Sun Jan 16, 2022 11:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week Start/End
- Replies: 12
- Views: 450
Re: Week Start/End
Each week "ends" on Sunday at 11:59 PM, and the proceeding week starts immediately after that.
- Sun Jan 16, 2022 11:33 pm
- Forum: Student Social/Study Group
- Topic: Great Resources for Studying Chemistry
- Replies: 6
- Views: 337
Re: Great Resources for Studying Chemistry
The peer learning sessions or the step up sessions are good resources for asking questions about specific homework problems that you're having issues with, at least from my experience. I usually watch the organic chemistry teacher on youtube for me to have a general understanding of how to approach ...
- Sun Jan 09, 2022 11:59 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Exothermic Vs Endothermic
- Replies: 26
- Views: 2513
Re: Exothermic Vs Endothermic
Endothermic reactions have a positive H value, while exothermic reactions have negative, as the former absorbs heat, while the latter releases heat.
- Sun Jan 09, 2022 11:58 pm
- Forum: Ideal Gases
- Topic: Taking Tests
- Replies: 28
- Views: 803
Re: Taking Tests
For 14A, the midterm and final were all multiple choice, around 20 questions for the midterms and roughly 40 or so for the final. We used lockdown browser, so the exams were essentially closed book, since we couldn't navigate to any other site.
- Sun Jan 09, 2022 11:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: New account for Chem 14B?
- Replies: 41
- Views: 49410
Re: New account for Chem 14B?
Your UID can't change, so you won't be able to make a new account. Changing your username to reflect your new discussion section should be good enough.
- Sun Jan 09, 2022 11:50 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: What does it mean if a reaction shifts to the left/right?
- Replies: 9
- Views: 899
Re: What does it mean if a reaction shifts to the left/right?
When a reaction shifts to the left, it means that the equilibrium reaction favors the reactants. On the other hand, if a reaction shifts to the right, that means that the equilibrium reaction favors the products.
- Sun Dec 05, 2021 11:31 pm
- Forum: Hybridization
- Topic: sp^2
- Replies: 20
- Views: 12094
Re: sp^2
sp^2 simply refers to possible areas of electron density, meaning that it can either be bonds or lone pairs.
- Sun Dec 05, 2021 11:29 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculating pH
- Replies: 11
- Views: 520
Re: Calculating pH
You should input the hydrogen ion concentration. That is, the M value of hydrogen ions.
- Sun Dec 05, 2021 11:26 pm
- Forum: Student Social/Study Group
- Topic: Finals Week
- Replies: 20
- Views: 1244
Re: Finals Week
Im really looking forward to spending time with my friends and family back in my home time. This is the first time I've spent any significant amount of time away from them, and I want to make up for lost time.
- Sun Dec 05, 2021 11:26 pm
- Forum: Student Social/Study Group
- Topic: Finals Week
- Replies: 20
- Views: 1244
Re: Finals Week
Im really looking forward to spending time with my friends and family back in my home time. This is the first time I've spent any significant amount of time away from them, and I want to make up for lost time.
- Tue Nov 30, 2021 10:52 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Achieve HW Week 9: problem 3
- Replies: 2
- Views: 130
Achieve HW Week 9: problem 3
For number 3, the molecular shapes that are common for complexes with a coordination number of 4 is apparently tetrahedral and square planar. I'm confused as to why the seesaw shape is not also common. It includes four atoms that are bound to a central atom, which matches the coordination number of ...
- Sun Nov 28, 2021 10:31 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 333893
Re: Final Jitters
I'm honestly extremely nervous about this final, as it's the only final that I'm really concerned with. I'm hoping on just spamming practice problems, and getting in my regular gym sessions to get rid of any of my final nerves.
- Sun Nov 28, 2021 10:27 pm
- Forum: Dipole Moments
- Topic: polar bonds vs polar molecules
- Replies: 20
- Views: 660
Re: polar bonds vs polar molecules
Polar bonds refer to when two different atoms are bounded that have significantly different electron affinities. This essentially means that the two elements from which those atoms are derived are far from each other on the periodic table. A polar molecule refers to when the charges on the molecule ...
- Sun Nov 28, 2021 10:11 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Achieve HW #3
- Replies: 6
- Views: 267
Re: Achieve HW #3
For each coordination number, 4 and 6, you can treat the coordination number as the amount of areas of electron density in the molecule. As such, the possible shapes for each coordination are the same as the possible shapes that have 4 or 6 areas of electron density, respectively.
- Sun Nov 28, 2021 9:57 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: seesaw
- Replies: 20
- Views: 971
Re: seesaw
A see-saw shaped molecule has four bonded atoms, with another lone pair to accompany those atoms. That is, there are five areas of electron density within a see-saw shaped atom.
- Sun Nov 28, 2021 9:52 pm
- Forum: General Science Questions
- Topic: Studying
- Replies: 31
- Views: 1274
Re: Studying
TA Office Hours and the review sessions that Professor Lavelle posts should be good resources. I'd be sure to focus on the more recent topics that we've covered this quarter as well, since the final is going to focus more on recent content.
- Sun Nov 21, 2021 11:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final
- Replies: 3
- Views: 145
Re: Final
The final is cumulative, but based on what I've heard from people who've taken the course, there will be a higher emphasis on recent content.
- Sun Nov 21, 2021 11:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final exam
- Replies: 4
- Views: 222
Re: Final exam
The final exam is probably cumulative, based on what I've heard from people who've taken the test in the past, but there is an emphasis on recent chemistry content.
- Sun Nov 21, 2021 11:02 pm
- Forum: Resonance Structures
- Topic: Resonance Structure
- Replies: 5
- Views: 335
Re: Resonance Structure
Resonance structures occur when there are multiple ways to draw the lewis structure of a molecule. This usually occurs when 5here are alternate locations a double or triple bond can occur.
- Sun Nov 21, 2021 10:55 pm
- Forum: Dipole Moments
- Topic: LDF vs. Van Der Waals
- Replies: 31
- Views: 1118
Re: LDF vs. Van Der Waals
The names are interchangeable, and they refer to the same force.
- Sun Nov 21, 2021 10:53 pm
- Forum: Lewis Structures
- Topic: Achieve HW Q18
- Replies: 3
- Views: 133
Re: Achieve HW Q18
The way I do it, bond angle can be determined after finding molecular structure. It does take memorization, but visualizing the molecular shape makes it easier for me to find bond angles. Linear, for example, is just two atoms firectly across from each other, hence a 180 angle.
- Sun Nov 14, 2021 11:43 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Intermolecular Force
- Replies: 24
- Views: 1279
Re: Intermolecular Force
Van der waals forces are the only force tht is present in all covalent bonds.
- Sun Nov 14, 2021 11:41 pm
- Forum: Resonance Structures
- Topic: How To Determine Bond Lengths
- Replies: 13
- Views: 1150
Re: How To Determine Bond Lengths
The reason that increasing bond number (that is, from single to double to triple bond) decreases bond length is because an increase from single to double to triple bond correlates to an increase in bond strength. In other words, a single bond is relatively weak, double bond is in the middle, while a...
- Sun Nov 14, 2021 11:36 pm
- Forum: Electronegativity
- Topic: electronegativity and charge
- Replies: 2
- Views: 120
Re: electronegativity and charge
This definition is essentially correct, with the only possible correction being that the middle portion could specify that the "difference in charge" is a result of the bonded electrons being closer to the higher electronegative atom, making said atom being relatively more negative.
- Sun Nov 14, 2021 11:33 pm
- Forum: Student Social/Study Group
- Topic: post midterm joke
- Replies: 21
- Views: 1499
Re: post midterm joke
This meme will be a better way for me to study strengths of bonds than literally any other method.
- Sun Nov 14, 2021 11:23 pm
- Forum: General Science Questions
- Topic: Final
- Replies: 30
- Views: 1047
Re: Final
Step-up sessions, youtube videos on confusing concepts, and office hours are all good ways to study for the final. I'd also suggest asking your TA about problems that you missed on past midterms in order to learn what you did wrong on those exams, so that you won't make the same mistakes on the final.
- Sun Nov 07, 2021 11:34 pm
- Forum: Lewis Structures
- Topic: HW 3 Q 13
- Replies: 6
- Views: 280
Re: HW 3 Q 13
For me, my process was looking at the hydrogen that were bonded to an electronegative atom, and whether one Nitrogen, Oxygen, or Fluorine was present in the molecule and had lone pairs. For each hydrogen connected with an electronegative atom, I counted one possible hydrogen bond. For each lone pair...
- Sun Nov 07, 2021 11:31 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 12
- Views: 514
Re: Bond Length
You can determine bond length in this case by the atomic radii of the overall molecule. That is, the farther away from each other the two atoms are on the periodic table, the larger the bond length (and thus, the weaker the bond).
- Sun Nov 07, 2021 11:27 pm
- Forum: Properties of Light
- Topic: Upcoming Midterm and Final
- Replies: 3
- Views: 187
Re: Upcoming Midterm and Final
Midterm is the same format (even with the regular bonus question), to my knowledge the final will be the exact same format as well, just with more questions.
- Sun Nov 07, 2021 11:26 pm
- Forum: Ionic & Covalent Bonds
- Topic: Inter vs. Intra
- Replies: 85
- Views: 5377
Re: Inter vs. Intra
Intermolecular forces occurs between separate molecules, while intramolecular forces occur between the same molecule. An easy way I remember this is the difference between interpersonal and intrapersonal, the former preferring the company of people, and the latter type of person preferring their own...
- Sun Nov 07, 2021 11:24 pm
- Forum: General Science Questions
- Topic: Helpful chem resource
- Replies: 12
- Views: 1005
Re: Helpful chem resource
Thank you so much for the cheat sheet! Memorization has always been a struggle for me, so thank you!
- Sun Oct 31, 2021 11:40 pm
- Forum: Resonance Structures
- Topic: Lecture
- Replies: 3
- Views: 144
Re: Lecture
According to professor Lavelle's email, you can just show up to either lecture 1 or 2 in person without doing anything prior.
- Sun Oct 31, 2021 11:37 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm 2
- Replies: 6
- Views: 275
Re: Midterm 2
I think only professor Lavelle knows whether or not there will be a practice question, but I'd assume not, considering the first practice question was to test Respondus.
- Sun Oct 31, 2021 11:30 pm
- Forum: Lewis Structures
- Topic: Midterm 2 question
- Replies: 6
- Views: 190
Re: Midterm 2 question
Midterm 2 won't be cumulative, meaning you won't have to worry about midterm 1 material on the exam.
- Sun Oct 31, 2021 11:27 pm
- Forum: Ionic & Covalent Bonds
- Topic: Homework
- Replies: 3
- Views: 138
Re: Homework
Yes, our homework is due by next week on Sunday, November 7th.
- Sun Oct 31, 2021 11:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Review
- Replies: 5
- Views: 207
Re: Midterm Review
You can review your midterm with your TA during their office hours, which you can find on professor Lavelle's CHEM 14A website.
- Sun Oct 24, 2021 11:32 pm
- Forum: DeBroglie Equation
- Topic: Achieve 17
- Replies: 6
- Views: 417
Re: Achieve 17
Take the mass given by the periodic table, then divide by Avogadro's Number to get the per atom value.
- Sun Oct 24, 2021 11:23 pm
- Forum: Student Social/Study Group
- Topic: Moving to Westwood soon. Which restaurants should I visit?
- Replies: 45
- Views: 2490
Re: Moving to Westwood soon. Which restaurants should I visit?
Diddie Riese is always good for a quick, cheap dessert.
- Sun Oct 24, 2021 11:21 pm
- Forum: *Shrodinger Equation
- Topic: How to use on test
- Replies: 3
- Views: 376
Re: How to use on test
What we're learning this chapter only requires conceptual understanding, instead of the usual problem solving.
- Sun Oct 24, 2021 11:20 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Midterm Scores
- Replies: 16
- Views: 519
Re: Midterm Scores
Scores will come out in a few days, based on an email professor Lavelle just sent out. The fact that we're graded on a curve should help too!
- Sun Oct 24, 2021 11:18 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Midterm scores
- Replies: 19
- Views: 468
Re: Midterm scores
I just got an email saying midterm results are coming soon. Considering that Professor Lavelle usually grades on a curve, I'm hoping for a good score for all of us!
- Sun Oct 17, 2021 11:03 pm
- Forum: SI Units, Unit Conversions
- Topic: Midterm 1
- Replies: 9
- Views: 397
Re: Midterm 1
Based on an email that Professor Lavelle just sent out, the only material that will be covered on midterm 1 will be the lectures up till Friday of week 3.
- Sun Oct 17, 2021 10:55 pm
- Forum: General Science Questions
- Topic: Chem 14A MIDTERM CURVE
- Replies: 2
- Views: 109
Re: Chem 14A MIDTERM CURVE
From what I've heard the grade is curved, but that curve is pretty much entirely dependent on the class average. Either way I don't think the curve will make a major difference in our grade, though.
- Sun Oct 17, 2021 10:49 pm
- Forum: Properties of Light
- Topic: Equation sheet
- Replies: 23
- Views: 808
Re: Equation sheet
The equation sheet is provided, there's a link on his website called "midterm 1 information" that has all the prep that you need for the midterm.
- Sun Oct 17, 2021 10:48 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Equations sheet
- Replies: 9
- Views: 359
Re: Equations sheet
You can find the constants on the homepage of Professor Lavelle's 14A website. I found everything that I need for the midterm under "midterm 1 information" on his website as well.
- Sun Oct 17, 2021 10:46 pm
- Forum: General Science Questions
- Topic: Midterm Format
- Replies: 5
- Views: 165
Re: Midterm Format
It's all multiple choice, and I know for online work that you don't have to upload your scratch paper, so the work you do for each problem probably won't contribute to your score.
- Sun Oct 10, 2021 10:36 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Mass of an element
- Replies: 28
- Views: 635
Re: Mass of an element
Masses won't be provided in the question, but a periodic table will always be provided, so you won't have to memorize the mass of anything.
- Sun Oct 10, 2021 10:35 pm
- Forum: Significant Figures
- Topic: Values for Molar Mass
- Replies: 22
- Views: 957
Re: Values for Molar Mass
Personally, I try to be consistent with how I round if the problem doesn't give me a specific number (if the problem does, then I just use the exact same number). This usually means I round to the thousandths place for all the numbers that I use.
- Sun Oct 10, 2021 10:33 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Atom Mass for Oxygen
- Replies: 15
- Views: 576
Re: Atom Mass for Oxygen
While I would use 15.999 for the sake of accuracy, I feel like the difference is small enough that it shouldn't change your answer enough to get a whole question incorrect. For the homework questions at least, my answers haven't differed enough for it to matter.
- Sun Oct 10, 2021 9:43 pm
- Forum: General Science Questions
- Topic: Studying for the Mid-term
- Replies: 20
- Views: 728
Re: Studying for the Mid-term
Pretty sure practice problems with a group would be the best way to study. Doing all the optional problems in a group and working through them together helped me get a better conceptual understanding of the chemistry, and going to TA office hours with anything that got my entire group stumped has he...
- Sun Oct 10, 2021 9:33 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem 14 Discussion
- Replies: 2
- Views: 112
Re: Chem 14 Discussion
I haven't in my discussion section, and I would assume that would apply to all of the other discussion sections as well.
- Sun Oct 03, 2021 10:38 pm
- Forum: Significant Figures
- Topic: Significant Figures When Last Significant is Zero
- Replies: 14
- Views: 873
Re: Significant Figures When Last Significant is Zero
Adele Nguyen 1H wrote:Wait, just double checking, does 24000 have 2 significant figures?
24000 only has two significant figures, yes. As for how to write out the number, just leaving it as it is is fine, although you could change it to scientific notation as well.
- Sun Oct 03, 2021 10:28 pm
- Forum: SI Units, Unit Conversions
- Topic: Homework Deadline
- Replies: 15
- Views: 464
Re: Homework Deadline
Lulu Almoshawah wrote:I haven't figured out how to make a new post yet so.. I'll just ask here if the chemistry community posts can be both questions and replies?
Chemistry community posts can be either question or replies, both get credit for your participation points.
- Sun Oct 03, 2021 10:17 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Discussion
- Replies: 5
- Views: 213
Re: Discussion
Attendance to discussion doesn't have any impact on your grade, but working through the practice problems themselves are something I find to be pretty helpful to my understanding.
- Sun Oct 03, 2021 10:11 pm
- Forum: Properties of Light
- Topic: Audio-Visual Focus-Topics
- Replies: 4
- Views: 245
Re: Audio-Visual Focus-Topics
It seems to me that they're all just extra practice, but for me personally I'm probably still going to need them.
- Tue Dec 15, 2020 9:04 am
- Forum: General Science Questions
- Topic: Passing Grade
- Replies: 34
- Views: 1849
Re: Passing Grade
That's how I originally interpreted it too, but when asked my TA clarified that only a 50% or better is required to pass with a C-, so I'm pretty sure that's true.
- Thu Dec 10, 2020 12:25 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Base of a Strong Acid
- Replies: 1
- Views: 155
Re: Conjugate Base of a Strong Acid
To my knowledge, they would be able to deprotonate water, but to a very small extent. The conjugate base of a strong acid will be weak, so the rate at which the base will deprotonate water will be extremely low.
- Sun Dec 06, 2020 11:08 pm
- Forum: Student Social/Study Group
- Topic: Recorded Reviews
- Replies: 1
- Views: 158
Re: Recorded Reviews
^^ seconded. I'm planning on attending as many sessions as my schedule allows, but I'd hope I'd be able to watch the reviews that don't fit into my schedule.