Search found 87 matches

by josephspindler2H
Sun Feb 21, 2021 3:43 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: State function?
Replies: 36
Views: 104

Re: State function?

E depends on the path taken, so it would not be a state function. You are not able to compare the final and initial states like you would with a state function.
by josephspindler2H
Sun Feb 21, 2021 3:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Tips for Concentrating during a test
Replies: 31
Views: 97

Re: Tips for Concentrating during a test

Definitely a good strategy is to arrange some kind of quiet time or you time before the test, so that you enter the exam with a clear mind. Test stress can hurt your focus and performance on the test, so don't over think it.
by josephspindler2H
Sun Feb 21, 2021 3:39 pm
Forum: Student Social/Study Group
Topic: Has anyone taken Chem 20L before?
Replies: 3
Views: 11

Re: Has anyone taken Chem 20L before?

I have a friend taking 20L and it sounds fairly similar to 14BL but perhaps a little bit more rigorous and separated from the biological context found in the 14 series.
by josephspindler2H
Sun Feb 21, 2021 3:38 pm
Forum: Student Social/Study Group
Topic: Classes for next quarter?
Replies: 127
Views: 410

Re: Classes for next quarter?

I'm going to be taking 14C and an upper div, but I am not so certain for another class since stats 13 and physics 5C filled up really quickly.
by josephspindler2H
Sun Feb 21, 2021 3:37 pm
Forum: Administrative Questions and Class Announcements
Topic: struggling
Replies: 58
Views: 176

Re: struggling

I always recommend going to the UA sessions it can help give you more advanced practice and help reinforce concepts as well as open up the opportunity to ask questions in a pseudo-in-person sort of fashion.
by josephspindler2H
Sun Feb 14, 2021 2:06 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: R Constant
Replies: 89
Views: 243

Re: R Constant

You are correct in assuming that you use .08206 with atm, the other value is for use with energy or work (notice it has joules in its units). Like with most concepts in this class, units are very important and can be the deciding factor for which values are used.
by josephspindler2H
Sun Feb 14, 2021 2:04 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: temperature
Replies: 32
Views: 76

Re: temperature

It will depend on the problem in question and the units that are given. Sometimes, you can get away with keeping celcius if a change in temperature is needed (since the relative difference will be the same regardless of which unit). But other times call for Kelving to be used to do a difference in u...
by josephspindler2H
Sun Feb 14, 2021 2:02 pm
Forum: Student Social/Study Group
Topic: Chem 14BL Workload
Replies: 22
Views: 131

Re: Chem 14BL Workload

I would say 14BL is heavily dependent on your lab group and TA, as the workload can be very manageable with a strong group that communicates well. If you can organize well, 14Bl should be more than manageable.
by josephspindler2H
Sun Feb 14, 2021 2:01 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Kelvin conversion
Replies: 40
Views: 85

Re: Kelvin conversion

As everyone is citing, the conversion is +273.15 to the C value. thats why we see 298 K so often (its 25 C or room temperature).
by josephspindler2H
Sun Feb 14, 2021 1:59 pm
Forum: Student Social/Study Group
Topic: Song From Today's Lecture?
Replies: 6
Views: 70

Re: Song From Today's Lecture?

If there isn't a Lavelle Spotify playlist, somebody should make one! A collection of the 14 series greatest hits.
by josephspindler2H
Sun Feb 07, 2021 3:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem Community Grade Error
Replies: 15
Views: 102

Re: Chem Community Grade Error

As others have stated, Lavelle factored in this week as well as the previous weeks but we have till today at midnight to get the 5 points for this week so nothing to worry about. It will be updated later on in the quarter :)
by josephspindler2H
Sun Feb 07, 2021 3:27 pm
Forum: Student Social/Study Group
Topic: Chemistry Community Posts
Replies: 9
Views: 54

Re: Chemistry Community Posts

I think the lower number does not factor in multiple replies to the same post tree, while the higher number does.
by josephspindler2H
Sun Feb 07, 2021 3:25 pm
Forum: Student Social/Study Group
Topic: Study routine.
Replies: 51
Views: 99

Re: Study routine.

My best resources have definitely been practice problems and the UA sessions. Someone posted a very useful study guide that briefly summed up each of the core concepts from each section in the textbook.
by josephspindler2H
Sun Feb 07, 2021 3:22 pm
Forum: Student Social/Study Group
Topic: Book Recommendations
Replies: 53
Views: 154

Re: Book Recommendations

I have been reading Crime and Punishment for a long time (it's a bit boring in parts) but it's a very interesting book conceptually. Slaughterhouse Five and Fahrenheit 451 are both phenomenal books and I cannot recommend them enough--the latter of which is loosely tied to the thermodynamics of our c...
by josephspindler2H
Sun Feb 07, 2021 3:19 pm
Forum: Student Social/Study Group
Topic: Identifying Dr. Lavelle's Music
Replies: 14
Views: 130

Re: Identifying Dr. Lavelle's Music

i always wondered what Lavelle decided to play in class. They sounded so familiar but I couldn't place any of the sounds.
by josephspindler2H
Sun Jan 31, 2021 5:42 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: polyprotic acids
Replies: 9
Views: 79

Re: polyprotic acids

t=Thank you for asking this question! I was wondering when we were supposed to ignore the effect of the second or third ka values.
by josephspindler2H
Sun Jan 31, 2021 5:40 pm
Forum: Ideal Gases
Topic: Chem BL
Replies: 90
Views: 398

Re: Chem BL

I am taking 14BL this quarter but there is not too much overlap at the moment. I would say you could take this course next quarter or later if need be.
by josephspindler2H
Sun Jan 31, 2021 5:38 pm
Forum: Student Social/Study Group
Topic: Go treat yourself after MT1!
Replies: 75
Views: 302

Re: Go treat yourself after MT1!

Thank you for this very kind post! I think it is very important to have some time to relax and focus on your own health. We're almost at the halfway point of the quarter so we should be proud of ourselves.
by josephspindler2H
Sun Jan 31, 2021 5:36 pm
Forum: Administrative Questions and Class Announcements
Topic: 14C?
Replies: 23
Views: 122

Re: 14C?

I plan on taking 14 C next quarter, but you bring up a good point. The content may not stick through the summer break, but I believe this may just translate to helpful review.
by josephspindler2H
Sun Jan 31, 2021 5:34 pm
Forum: Administrative Questions and Class Announcements
Topic: midterm
Replies: 16
Views: 85

Re: midterm

Based off of last quarter, I would say it takes about a week for grades to come out.
by josephspindler2H
Sun Jan 24, 2021 4:55 pm
Forum: Student Social/Study Group
Topic: CHEM 14B Midterm 1 Notes
Replies: 23
Views: 142

Re: CHEM 14B Midterm 1 Notes

Thank you! That's really kind of you to share. Good luck studying!
by josephspindler2H
Sun Jan 24, 2021 4:55 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Increase in Pressure
Replies: 31
Views: 84

Re: Increase in Pressure

I believe this would only be for gases rather than aqueous substances. Changing the pressure would only affect the moles of gas.
by josephspindler2H
Sun Jan 24, 2021 4:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Periodic Tables on Midterm
Replies: 23
Views: 66

Re: Periodic Tables on Midterm

Although the test is not open note or open book, Dr. Lavelle has an equation sheet and periodic table on his website that we should have printed out for the midterms and final.
by josephspindler2H
Sun Jan 24, 2021 4:52 pm
Forum: Phase Changes & Related Calculations
Topic: Define Phase Change
Replies: 76
Views: 217

Re: Define Phase Change

A phase change is when a substance changes from one state of matter to another (gas to liquid, solid to liquid, etc.). These occur at the melting point and boiling point, for example. These are the temperatures where such phase changes can occur.
by josephspindler2H
Sun Jan 24, 2021 4:49 pm
Forum: Phase Changes & Related Calculations
Topic: H and q
Replies: 47
Views: 175

Re: H and q

Q is for heat and H is for enthalpy!
by josephspindler2H
Sun Jan 17, 2021 3:36 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: q vs k
Replies: 62
Views: 204

Re: q vs k

Yeah Q will become K, Q is indeed the value when not at equilibrium. Q wants to become closer and closer to K in order to reach equilibrium.
by josephspindler2H
Sun Jan 17, 2021 3:34 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: shifts left or right
Replies: 23
Views: 83

Re: shifts left or right

Shifting to the right means that the products are favored (more will be produced to fit the equilibrium) while shifting to the left means the reactants are favored (again more will be produced). It can helpful to think of the products being on the right side of the chemical equation while the reacta...
by josephspindler2H
Sun Jan 17, 2021 3:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximations
Replies: 4
Views: 26

Re: Approximations

The key point that leads to us being able to approximate is that .20 is so much larger than 10^-4 (relatively speaking) that the result will be just about .20 after the subtraction. It's less that x is close to zero and more that the relative operation is not impactful on the initial quantities.
by josephspindler2H
Sun Jan 17, 2021 3:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Amphiprotic
Replies: 8
Views: 42

Re: Amphiprotic

Amphiprotic molecules can act as either a proton acceptor or donor (bronsted-lowry base or acid). It's a similar term to amphoteric but specific to proton acceptance and donation.
by josephspindler2H
Sun Jan 17, 2021 3:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterms
Replies: 24
Views: 66

Re: Midterms

I'm pretty sure things will be slightly different this quarter and will be during lecture time instead of discussion section. I asked my TA about it and he told us that the logistics are still being ironed out. We will find out for sure soon.
by josephspindler2H
Sun Jan 10, 2021 7:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units
Replies: 27
Views: 111

Re: Units

The preferred unit will be atm! You should not give an answer in moles per liter as that would be the unit for concentration rather than pressure. You can easily convert between the two as Dr. Lavelle taught in lecture.
by josephspindler2H
Sun Jan 10, 2021 7:17 pm
Forum: Ideal Gases
Topic: Units for Pressure
Replies: 41
Views: 845

Re: Units for Pressure

We will be using atm. As Dr. Lavelle stated in lecture, 1 bar is very close to 1 atm, so for our purposes we can just use atm.
by josephspindler2H
Sun Jan 10, 2021 7:14 pm
Forum: Administrative Questions and Class Announcements
Topic: Sapling homework due date
Replies: 14
Views: 87

Re: Sapling homework due date

Thanks for clarifying that the homework is due next Sunday 1/17! Out of curiosity, does anyone know if week 2 homework also be due that day?
by josephspindler2H
Sun Jan 10, 2021 7:11 pm
Forum: Ideal Gases
Topic: Advice on how to navigate Chem Community
Replies: 17
Views: 109

Re: Advice on how to navigate Chem Community

I heavily rely on the "Quick links" tab on the top left to navigate chemistry community, from there you can best explore the newest posts and the differing topics you may need help in or what to help someone out in.
by josephspindler2H
Sun Jan 10, 2021 7:09 pm
Forum: Student Social/Study Group
Topic: Comfort Movies
Replies: 128
Views: 343

Re: Comfort Movies

I've always been a big star wars guy, so any of the original three help me unwind. But I don't usually like having movies or tv shows play in the background while I work or study; I feel like I end up getting easily distracted.
by josephspindler2H
Sat Dec 12, 2020 3:25 pm
Forum: Student Social/Study Group
Topic: Study music
Replies: 32
Views: 226

Re: Study music

I listen to a lot of classical music for studying and doing work. Study's tend to say it's conducive to a good working environment. Also, apparently listening to new and different songs is beneficial!
by josephspindler2H
Wed Dec 09, 2020 4:41 pm
Forum: Conjugate Acids & Bases
Topic: Amphoteric
Replies: 11
Views: 102

Re: Amphoteric

I think in terms of what we will be exposed to in this course, we can determine if something is amphoteric based on what it is being exposed to. The outcome can tell us if it is amphoteric. I believe it is helpful know some of the most common ones, such as water.
by josephspindler2H
Wed Dec 09, 2020 4:38 pm
Forum: Hybridization
Topic: Determining Hybridization
Replies: 4
Views: 52

Re: Determining Hybridization

Look at the areas of electron density! So that's bonds and lone pairs. Keep in mind that double and triple bonds only count as one area of electron density, they don't increase the count. That's why you can have a double bond and have trigonal planar instead of tetrahedral. In this case, it would be...
by josephspindler2H
Wed Dec 09, 2020 4:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Naming on Final
Replies: 9
Views: 101

Re: Naming on Final

It seems like the best strategy is to memorize the most common ones and more specifically those within the textbook problems.
by josephspindler2H
Wed Dec 09, 2020 4:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 10 Review Sessions - Recorded?
Replies: 7
Views: 101

Re: Week 10 Review Sessions - Recorded?

It seems like the review sessions depend on the UA and the format, as the one I attended was not recorded.
by josephspindler2H
Sun Dec 06, 2020 1:59 pm
Forum: Administrative Questions and Class Announcements
Topic: 14B and 14BL
Replies: 13
Views: 159

Re: 14B and 14BL

I am going to be taking them together, though it is totally acceptable to do them at separate times like 7C and 23L. At the end of the day, it's more about what works for you and your schedule.
by josephspindler2H
Sun Dec 06, 2020 1:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 21
Views: 161

Re: Final

As others have stated, it will be pretty much the same as our past two midterms. The final will be 30 questions that are each 6 points, however.
by josephspindler2H
Sun Dec 06, 2020 1:55 pm
Forum: Naming
Topic: Naming Practice
Replies: 4
Views: 51

Re: Naming Practice

Thank you so much! Good luck studying!
by josephspindler2H
Sun Dec 06, 2020 1:54 pm
Forum: Lewis Structures
Topic: Angles of Bonding Pairs
Replies: 8
Views: 78

Re: Angles of Bonding Pairs

Emily and Serena both had solid answers and covered much of what I was thinking. It's important to know the base bond angles (180, 120, 109.5) and where they come from, but the effect of lone pairs doesn't need to be memorized quantitatively (i.e. just know that bond angles will be smaller due to th...
by josephspindler2H
Sun Dec 06, 2020 1:50 pm
Forum: Student Social/Study Group
Topic: Final Exam Study Tips
Replies: 48
Views: 283

Re: Final Exam Study Tips

The best place to start is 100% the textbook problems. They best reflect what's gonna be covered on the test, also look into going to some of these review sessions that Dr. Lavelle has planned.
by josephspindler2H
Sun Nov 29, 2020 2:30 pm
Forum: Administrative Questions and Class Announcements
Topic: Outlines for the Final
Replies: 11
Views: 119

Re: Outlines for the Final

Yes we are in the process of completing or will complete learning about these two outlines. As others have stated, they are relatively shorter in comparison to the outlines on the past two midterms.
by josephspindler2H
Sun Nov 29, 2020 2:28 pm
Forum: General Science Questions
Topic: Grade Breakdown
Replies: 32
Views: 371

Re: Grade Breakdown

There was similar post about this, and it seems the consensus is all over the place. The syllabus does not give an exact breakdown and there are disagreements over them. I would say not to worry too much about the numbers and focus on doing your best!
by josephspindler2H
Sun Nov 29, 2020 2:26 pm
Forum: Student Social/Study Group
Topic: How to study for class
Replies: 30
Views: 221

Re: How to study for class

As with the consensus here, the textbook problems are very helpful, though the textbook can be a bit greater in scale at times. Lavelle's lectures and videos online can be greatly helpful in understanding the concepts, while the textbook problems help with their application.
by josephspindler2H
Sun Nov 29, 2020 2:24 pm
Forum: Administrative Questions and Class Announcements
Topic: grading
Replies: 11
Views: 128

Re: grading

Every class does grade distributions differently, so i am not sure what the points will translate to. I was also curious about the 50% and C- thing on the syllabus. If I recall correctly, the syllabus does not say the percentages needed for each level of grade either. Some classes have A+ as only ov...
by josephspindler2H
Sun Nov 29, 2020 2:22 pm
Forum: Student Social/Study Group
Topic: How have your study habits changed?
Replies: 45
Views: 342

Re: How have your study habits changed?

Certainly, the one constant so far has been doing the textbook problems. Although, I too have revamped how I have been taking notes in class. Another important strategy I have adopted is to ask myself if I can explain each topic and see if I really can define key terms. It helps me better understand...
by josephspindler2H
Sun Nov 22, 2020 4:22 pm
Forum: General Science Questions
Topic: # of chem posts
Replies: 27
Views: 334

Re: # of chem posts

We need 35 posts by tonight at midnight. Each week has a requirement of 5 posts, so 40 next week, then 45 for week 9, and finally 50 by week 10.
by josephspindler2H
Sun Nov 22, 2020 4:18 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Lectures through Thanksgiving
Replies: 7
Views: 91

Lectures through Thanksgiving

Hey all, I was just wondering if there will be lectures and discussion on wednesday and/or friday. Some classes have cancelled both, though I am unsure what 14A's plan is for this upcoming week.
by josephspindler2H
Sun Nov 22, 2020 4:15 pm
Forum: Student Social/Study Group
Topic: Winter 2021 Classes
Replies: 20
Views: 224

Re: Winter 2021 Classes

12 is the minimum! That's what you need to be a full-time student. Don't worry about this too much, everything will work out!
by josephspindler2H
Sun Nov 22, 2020 4:11 pm
Forum: Student Social/Study Group
Topic: Study Tips for Final Exam
Replies: 57
Views: 442

Re: Study Tips for Final Exam

I would say textbook problems and the UA worksheets are our best bet for studying. They're solid resources and help build understanding. I definitely think I will be attending more UA sessions in preparation for this exam.
by josephspindler2H
Sun Nov 22, 2020 4:10 pm
Forum: Student Social/Study Group
Topic: Exercising Our Minds and Bodies
Replies: 114
Views: 600

Re: Exercising Our Minds and Bodies

I've been running a few miles or so each week, nothing too crazy. It's nice to go out to trails if possible.
by josephspindler2H
Tue Nov 17, 2020 1:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem 14BL and Chem 14B
Replies: 6
Views: 53

Chem 14BL and Chem 14B

For enrollment, do we need to take both these courses at the same time, or is it like LS 7C and LS23L where we have the option to take 7C first and 23L later on?
by josephspindler2H
Tue Nov 17, 2020 1:33 pm
Forum: Student Social/Study Group
Topic: Midterm 2 Content
Replies: 2
Views: 31

Re: Midterm 2 Content

Thank you, Cassidy! I just wanted to double check. Good luck studying!
by josephspindler2H
Mon Nov 16, 2020 7:48 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Midterm 2 Textbook Topics
Replies: 3
Views: 25

Re: Midterm 2 Textbook Topics

It is a good idea to check and see if you can define each of the bullet points as Simer said. Sometimes, we think we know certain topics or ideas, but it can be difficult to explain. If we can explain them effectively, then we have a much better understanding of the topic and it will show on the test.
by josephspindler2H
Mon Nov 16, 2020 7:41 pm
Forum: Student Social/Study Group
Topic: Chemistry Among Us
Replies: 43
Views: 462

Re: Chemistry Among Us

Are you going to continue this series of posts? Many of us--myself included--would like to know where you're going with this.

Also, I would call out green.
by josephspindler2H
Mon Nov 16, 2020 7:38 pm
Forum: Student Social/Study Group
Topic: Midterm 2 Content
Replies: 2
Views: 31

Midterm 2 Content

Just to confirm, the last lecture that will have content on Midterm 2 is Wednesday from last week, right? I just want to be certain before going into the test.
by josephspindler2H
Mon Nov 16, 2020 7:35 pm
Forum: Administrative Questions and Class Announcements
Topic: MT 2 Material
Replies: 4
Views: 43

Re: MT 2 Material

Based on your question, it seems you dealing with Chem 14A material though you posted in the Chem 14B section. Just a reminder to take note of that, you'll probably get more answers from fellow 14A students if you post in the right class section.
by josephspindler2H
Mon Nov 16, 2020 7:32 pm
Forum: Student Social/Study Group
Topic: Midterm 2 content
Replies: 20
Views: 157

Re: Midterm 2 content

As many have already stated, lewis structures is a key focus for this section. It would be helpful to do the sapling textbook problems to practice making these. I believe this midterm stops content-wise at hydrogen bonding.
by josephspindler2H
Sun Nov 08, 2020 6:35 pm
Forum: Trends in The Periodic Table
Topic: # of electrons
Replies: 23
Views: 121

Re: # of electrons

Each element has a number of electrons equal to its atomic number. However, it can have more or less depending on if it is an ion or not (loses as a cation (+), gains as an anion (-)).
by josephspindler2H
Sun Nov 08, 2020 6:31 pm
Forum: Student Social/Study Group
Topic: Lecture on Veteran's Day
Replies: 10
Views: 64

Lecture on Veteran's Day

Will there be a lecture posted this Wednesday? Just checking to see as it's Veteran's Day.
by josephspindler2H
Sun Nov 08, 2020 6:27 pm
Forum: Electronegativity
Topic: Noble Gases
Replies: 40
Views: 2097

Re: Noble Gases

As many have already stated, Noble Gases are exempt from the electronegativity trend, as they already have a full octet and are within the most stable position.
by josephspindler2H
Sun Nov 08, 2020 6:25 pm
Forum: Student Social/Study Group
Topic: Chemistry Among Us
Replies: 43
Views: 462

Re: Chemistry Among Us

I'm heading to reactor. Not gonna risk it with Green
by josephspindler2H
Sun Nov 08, 2020 6:15 pm
Forum: Student Social/Study Group
Topic: Favorite TV shows
Replies: 189
Views: 1206

Re: Favorite TV shows

Mr. Robot is ridiculously good. It has some of the best writing on TV ever, great performances from the cast, and spectacular direction.
by josephspindler2H
Sun Nov 01, 2020 8:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing Electronic Configurations
Replies: 8
Views: 44

Re: Writing Electronic Configurations

It will depend on the problem asked! Some will ask for the full configuration and other won't. If they don't, it is easiest to refer to the latest noble gas and build your configuration from there.
by josephspindler2H
Sun Nov 01, 2020 7:59 pm
Forum: Properties of Light
Topic: Is c always the speed of light?
Replies: 88
Views: 501

Re: Is c always the speed of light?

Yes, the constant c will remain a constant 2.99792 x 10^8 m/s. c will always refer to the speed of light for the purposes of our classes (as far as I am aware).
by josephspindler2H
Sun Nov 01, 2020 7:56 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 4
Views: 35

Re: Electron Affinity

Electron affinity is the change in energy when a negative ion is formed (an electron joins a neutral atom). For example, it looks at the change in energy from an F atom to an F^-1 atom.
by josephspindler2H
Sun Nov 01, 2020 7:02 pm
Forum: Student Social/Study Group
Topic: Halloween!!!
Replies: 54
Views: 349

Re: Halloween!!!

I took a mental day and watched The Addams Family with some friends! I probably should have done some more homework but it was nice to have a day off.
by josephspindler2H
Sun Nov 01, 2020 7:00 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 12
Views: 74

Re: Octet Rule

The first four elements do not abide by the octet rule (H, He, Li, Be) as they only fill the 1s and 2s subshells.
by josephspindler2H
Sun Oct 25, 2020 4:47 pm
Forum: SI Units, Unit Conversions
Topic: units to know for midterm
Replies: 11
Views: 150

Re: units to know for midterm

On the constants and equations worksheet from Professor Lavelle's chem14a website, there is something listed as "1 atm = 101.325 kPa" Could someone please explain what this means? We haven't gotten to this section of chemistry (pressure) yet, so you do not have to worry about it for the u...
by josephspindler2H
Sun Oct 25, 2020 4:43 pm
Forum: Properties of Electrons
Topic: intensity vs energy
Replies: 29
Views: 268

Re: intensity vs energy

As many have already discussed, this statement is decidedly false. When we go to the quantum level, the level of one photon, the energy will not increase. This is because increasing intensity increases the number of photons of light, rather than the individual energy of each photon. More photons doe...
by josephspindler2H
Sun Oct 25, 2020 4:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Graphs on Midterm
Replies: 4
Views: 45

Re: Graphs on Midterm

I haven't heard anything about graphs specifically on the midterm. From what I have gathered, the midterm will be split between conceptual problems and more mathematical ones. A graph could pop up based on this information, but we will likely have see it before or be able to interpret it.
by josephspindler2H
Sun Oct 25, 2020 4:37 pm
Forum: Photoelectric Effect
Topic: Mass of atoms
Replies: 18
Views: 105

Re: Mass of atoms

As some such as Halle have already stated, the equations and constants sheets will have the mass of protons, electrons, and neutrons provided. We'll be using kg as the unit of choice as other constants/equations will be dependent on this unit.
by josephspindler2H
Wed Oct 21, 2020 4:17 pm
Forum: Properties of Electrons
Topic: Properties of Electrons and Matter as a Whole
Replies: 5
Views: 53

Properties of Electrons and Matter as a Whole

Am I correct in thinking that electrons possess both wave-like and particle-like properties? Additionally, basically all matter possesses particle-like properties, but can matter's wavelike properties only be detected at very small scales?
by josephspindler2H
Sun Oct 18, 2020 3:01 pm
Forum: DeBroglie Equation
Topic: Names of equations
Replies: 8
Views: 39

Re: Names of equations

I think it would be helpful to familiarize yourself with the equations, so that you can recognize when to use them on the exam. If you do not know its name, be able to name its purpose and the components that make up the formula.
by josephspindler2H
Sun Oct 18, 2020 2:59 pm
Forum: Photoelectric Effect
Topic: Light Intensity
Replies: 23
Views: 110

Re: Light Intensity

Yes, you are correct! If they had changed the wavelength or frequency, they would have changed the type of light being shown. As many have already stated, increasing the intensity led to an increase in total photons rather than individual photon energy. This is a problem on the quantum level where a...
by josephspindler2H
Sun Oct 18, 2020 2:56 pm
Forum: Properties of Light
Topic: Equation masterlist
Replies: 6
Views: 73

Re: Equation masterlist

Hi! You can access them on the chemistry 14a website under "constants and equations" (right below the tab "Everything you want to know about Sig Fig"). If you do not see it, I have the link to it: https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/constants_equati...
by josephspindler2H
Sun Oct 18, 2020 2:54 pm
Forum: *Black Body Radiation
Topic: Black Body Radiation
Replies: 6
Views: 104

Re: Black Body Radiation

I am not sure if this is the same concept in action. From what I recall Dr. Lavelle discussing, black body radiation is a theoretical discussion as nothing we know of absorbs all wavelengths of light. Though, color and light absorption would be an interesting discussion. Polar bears are known for th...
by josephspindler2H
Sun Oct 18, 2020 2:46 pm
Forum: Photoelectric Effect
Topic: Practice Quiz Question
Replies: 3
Views: 20

Re: Practice Quiz Question

I believe a keV is a kiloelectron volt, a thousand electron volts, and a unit of energy. What is an electron volt? An electron volt is the unit equal to the amount of kinetic energy gained by an electron accelerating through a electric potential difference of one volt from rest. One eV is equal to 1...
by josephspindler2H
Fri Oct 09, 2020 7:57 pm
Forum: Properties of Light
Topic: Amplitude and Velocity Relationship
Replies: 3
Views: 33

Re: Amplitude and Velocity Relationship

My understanding is that amplitude does not affect wave velocity. However, amplitude has more to do with the energy or intensity of the light? I'm not 100% sure though, anyone can feel free to correct me. I think you're correct. Amplitude is independent of frequency in simple harmonic motion which ...
by josephspindler2H
Fri Oct 09, 2020 7:51 pm
Forum: Balancing Chemical Reactions
Topic: Whole Number Stoichiometric Coefficients
Replies: 12
Views: 106

Re: Whole Number Stoichiometric Coefficients

As a few have already stated, the convention is to make the stoichiometric coefficients whole numbers. I think it generally makes the balanced equation easier to grasp and look neater overall. Having fractions unnecessarily complicates things, but it can be a bit of work to get there depending on th...
by josephspindler2H
Fri Oct 09, 2020 7:43 pm
Forum: Properties of Light
Topic: Why do salts with different cations burn different colors?
Replies: 2
Views: 46

Re: Why do salts with different cations burn different colors?

I am not well versed in salt-burning-coloration, however I do believe it is important to note the difference between a physical and chemical change. The element's color (a physical property) does not necessarily have an impact on what color it will burn (a chemical property). For example, you know N...
by josephspindler2H
Fri Oct 09, 2020 7:34 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Preference on Scientific Notation
Replies: 13
Views: 169

Preference on Scientific Notation

Is there a preference between the 1.0 x10^6 scientific notation and the shorthand 1.0 E6 notation?
by josephspindler2H
Fri Oct 09, 2020 7:29 pm
Forum: Molarity, Solutions, Dilutions
Topic: What does mmol stand for?
Replies: 33
Views: 362

Re: What does mmol stand for?

mmol stands for millimole. It is equal to one thousandth of a millimole and analogous to milliliter, millimeter, milligram, etc. To change units from mmol to mol, divide by 1000. To change from mol to mmol, multiple by 1000.

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