CHEMISTRY COMMUNITY

Jonathan Malau 1F

A negative delta g indicates that the reaction is spontaneous.

Jonathan Malau 1F

Delta G naught represents Gibbs free energy at "standard conditions", while Delta G is Gibbs free energy in any other condition.

Jonathan Malau 1F

In terms of additonal YouTube and website resources, I have definitely used the Organic Chemistry Tutor and Khan Academy.

Jonathan Malau 1F

From last quarter, I found the finals to be more difficult than the midterm, especially since - as others have noted - that the exam covered material from the entire quarter, rather than a set of a couple topics.

Jonathan Malau 1F

Midterm 2 is on Friday, February 19, during respective lecture times.

Jonathan Malau 1F

It typically depends on the units given in the problem. When using the equations entailed in the problem, using like-temperature units allows it to simplify.

Jonathan Malau 1F

It can be assumed that x is insignificant when concentration is less than 1.0x10^-3. Additionally, if the assumption is used, the final x should be less than 5% of the initial concentration.

Jonathan Malau 1F

Steam causes a more severe burn than boiling water even at the same temperature, because steam holds more heat energy as becoming a vapor from a liquid requires a large amount of heat before it can change phases.

Jonathan Malau 1F

Thanks for these tips.

Jonathan Malau 1F

I can definitely relate to this as well. To avoid careless mistakes, I try to make sure I'm giving my full attention. Other than that, as mentioned within posts above, double-checking steps before moving forward seems to be the only way.

Jonathan Malau 1F

I believe HClO3 is considered a strong acid.

Jonathan Malau 1F

Hi, like several posts above, I do plan on taking 14C next quarter.

Jonathan Malau 1F

If temperature is increased, the equilibrium moves in the direction of the endothermic reaction. If the temperature is reduced, the equilibrium moves in the direction of the exothermic reaction. I've read that increasing the temperature decreases the value of the equilibrium constant.

Jonathan Malau 1F

For one thing, to cope with anxiety, I have been trying to make sure that I drink enough water throughout the day. Staying hydrated has really helped.

Jonathan Malau 1F

To be honest, as of recently, I have not been exercising physically that often; however, before lockdown, I enjoyed playing basketball with friends.

Jonathan Malau 1F

Yes, the button is truly tempting; however, if you hit it, I believe it will give you no credit at all.

Jonathan Malau 1F

The concentration of reactants and products remain the same when an inert gas is added, because inert gas is non-reactive.

Jonathan Malau 1F

Ka represents the acidity constant (or ionization, or dissociation constant) and Kb signifies the basicity constant. A large Ka value means a strong acid; a large Kb value indicates a strong base. Kw=Ka*Kb allows us to solve for one value, when we know the others.

Jonathan Malau 1F

The temperature remains constant during phase changes because the heat energy which is supplied to change the state is used in breaking the intermolecular forces and other attractive forces; so, it remains constant as all the heat is used up and no external heat is released or absorbed.

Jonathan Malau 1F

Yes, on Dr. Lavelle's website, the "Exam Schedule" page shows that the exam will take place during class time, as opposed to discussion section.

Jonathan Malau 1F

Yes, endothermic reactions will always have a positive delta H (meaning that it absorbs energy), and exothermic reactions will always have a negative delta H (as it releases energy).

Jonathan Malau 1F

Practicing mindfulness and having better time management are two goals I have for this new year.

Jonathan Malau 1F

Spending time with my family and calling up my friends has made me more motivated. In terms of day-to-day strategy, scheduling out the day before has helped make me stay accountable.

Jonathan Malau 1F

I never get tired of watching the Dark Knight Trilogy - hands down, my favorite movie series of all time.

Jonathan Malau 1F

The goal is to have 5 posts by the end of Sunday each week. However, for last quarter at least, as long as 50 posts were made by the end of the quarter, then that would be sufficient. Not sure if that policy will be in effect this quarter also though.

Jonathan Malau 1F

I think it covers content from weeks 1 through 3, and so would include material from outlines 1,2 and - as others have mentioned - some from 3 (depending on where we finish by then).

Jonathan Malau 1F

I think that all reactions can theoretically reach equilibrium, as long as the system remains undisturbed.

Jonathan Malau 1F

If the equilibrium constant is 1 or nearly 1, it means that the molarities of the reactants and products are about the same. It's simply rare to see that no change is occurring at that point.

Jonathan Malau 1F

Yes, I believe it will be the same format as chem 14a in terms of using respondus.

Jonathan Malau 1F

To relax, I enjoy watching an inspirational movie or calling up a friend.

Jonathan Malau 1F

Agreeing with the posts above, making sure that you have 5 posts per week will be sufficient. You can check through the "Your Posts" section as well as the gradebook on MyUCLA.

Jonathan Malau 1F

Hi, as a study habit to develop, I would definitely recommend doing all the textbook problems.

Jonathan Malau 1F

I would reach out to your TA by email or discussion section.

Jonathan Malau 1F

Besides Sapling and textbook problems, I try to make sure that I understand the concepts through reviewing my notes and doing the textbook readings.

Jonathan Malau 1F

Thank you. This finals week has been a time unlike any other.

Jonathan Malau 1F

Thank you Dr. Lavelle!

Jonathan Malau 1F

I believe he meant that because quantum was our biggest section, most of the questions will be on that topic; additionally, I think he means that the topics - not just quantum - will come from the textbook.

Jonathan Malau 1F

Yes, I believe it will be similar in terms of having to setup a second device. However, we will be using a different zoom link compared to previous exams.

Jonathan Malau 1F

Yes, I believe the fundamentals section would be on our final; but I think the exam will focus more on topics that we spent the most time on.

Jonathan Malau 1F

To get rid of jitters, one thing I do is simply listen to my breath, so that I can stay in the present moment as opposed to letting my mind wander towards feeling anxious.

Jonathan Malau 1F

Doing all the textbook problems are really helpful. Since the final exam is cumulative, I would start by breaking up the topics by what you're most comfortable with to what you're not as comfortable with. From there, spend time on each topic, as needed.

Jonathan Malau 1F

To stay focused, I try to make and follow a schedule that enables me to get work done early in the day, so that by the end I have time to relax.

Jonathan Malau 1F

When the weather is nice, I play basketball. However, with the cold season lately, I've been exercising my mind indoors through playing chess.

Jonathan Malau 1F

The most effective tip I would give is to do the textbook problems. They have been really helpful to prepare for exams.

Jonathan Malau 1F

For specific midterm inquiries (especially to ask about questions we got wrong), my TA told us to email them.

Jonathan Malau 1F

For one thing, since having to study from home, I have experimented with different studying environments around my house - from changing my location, lighting, chair, etc. By being comfortable with the surrounding area, I am able to study for longer hours.

Jonathan Malau 1F

Yes, I think it will be cumulative.

Jonathan Malau 1F

I plan on taking it after Chem 14B for the same reasons as others have stated. However, I believe it can be a good idea if you know you can handle the workload.

Jonathan Malau 1F

I don't believe there will be class or discussion during Thanksgiving break; but yeah, it's best to stay flexible.

Jonathan Malau 1F

Yes, same here. You are not alone.

Jonathan Malau 1F

Yes, same here. You are not alone.

Jonathan Malau 1F

Yes, thank you. Likewise :)

Jonathan Malau 1F

For formal charge, I use: V - (s/2 + L). This is where v represents number of valence electrons, s signifies number of shared electrons, and L for number of lone pair electrons

Jonathan Malau 1F

It covers topics 1D, 1E, 1F, 2A, 2B, 2C, 2D, 3F.4, 3F.5 in the textbook (so the rest of the "Quantum World" and all of the "Chemical Bonds" outlines).

Jonathan Malau 1F

The brackets help show that the Lewis structure has an overall charge (written as a superscript outside of the brackets on the upper right).

Jonathan Malau 1F

S orbitals are more closer to the nucleus than p orbitals. The s electron experiences a higher nuclear charge and drops to lower energy; because the p orbital is more farther away from the nucleus, it requires more energy to maintain.

Jonathan Malau 1F

The structure with the least number of formal charges is more stable. Also, the most stable resonance structure will have negative charges on the most electronegative atoms and positive charges on the least electronegative atoms (of course, the most stable resonance structure will have a full octet ...

Jonathan Malau 1F

My other classes have announced that there will be no lecture/discussion on Veteran's Day, so I don't think so.

Jonathan Malau 1F

As a basketball fan, I really liked the Michael Jordan documentary that came out recently (now, on Netflix), known as the Last Dance.

Jonathan Malau 1F

As stated with the posts above, it truly depends on what the problem is asking for.

Jonathan Malau 1F

No, I don't think so. Based on the syllabus, the class is based on your points out of a total of 500 possible throughout.

Jonathan Malau 1F

You can also check through your MyUCLA portal under "Classes" then selecting "Exam and Homework Grades".

Jonathan Malau 1F

Yes, if the frequency of a wave increases by a certain amount, the wavelength of that same wave decreases by the same amount. Wavelength and frequency have - as others already mentioned - an inversely proportional relationship. This is depicted within the equation c=λv.

Jonathan Malau 1F

How does partial credit work for this test?

Jonathan Malau 1F

As a convention, neither wavelength nor frequency can ever be negative.

Jonathan Malau 1F

If the energy of a photon is less than the work function, then it may not get absorbed. A photon with less energy than work function is unable to eject electrons.

Jonathan Malau 1F

Based on the equation c=λv, c is always the speed of light.

Jonathan Malau 1F

Everything covered up until Week 3 Wednesday is fair game, which would include the fundamentals. To be more specific, the midterm would cover up to the end of 1D.2 in the textbook. Hope this helps.

Jonathan Malau 1F

To add to the post above, if an excess reactant is given, then generally there is a limiting reactant.

Jonathan Malau 1F

To relax, I enjoy calling up my friends and checking up on how they're doing.

Jonathan Malau 1F

To study for this midterm, I'm focusing on completing/reviewing the audio-visual focus modules and textbook problems, with an emphasis on understanding the concepts that go behind the individual problems.

Jonathan Malau 1F

Yes, when they are given, you should always include the states of matter upon balancing the equations.

Jonathan Malau 1F

Protons and neutrons have approximately the same mass, but both are much more massive compared to electrons.

Jonathan Malau 1F

I think there is just a slight difference within the definitions of the two terms. Threshold frequency refers to the minimum frequency of incident light that causes the metal surface to emit electrons, while work function is the minimum amount of energy necessary to remove an electron from an atom. ...

Jonathan Malau 1F

On the Weekly Online Discussion page, it states that any course related post counts as 1 point - that they can be "a comment, an answer, general discussion, assisting other students, etc." So, I think that to seek out general clarifications such as this would count. But yes, I would email ...

Jonathan Malau 1F

Yes, I think that is correct. In terms of what is to be "turned in", the Sapling HW has been pushed back to be due by the end of Week 4, but the chemistry community posts are still due on a weekly basis nonetheless.

Jonathan Malau 1F

The modules, with its pre and post assessments, have been incredibly helpful to better understand the concepts. Being able to be exposed to as many problems as possible I think is the most effective way to study and engrain the lessons. Additionally, I would also agree with the posts above that you ...

Jonathan Malau 1F

The stoichiometric coefficients must be whole numbers - that's just the preferred convention.

Jonathan Malau 1F

Sameer Chowdhury 1C wrote:Thanks everyone for your replies. So if they can be used interchangeably, is there any term for the reactant in excess, or do we refer to it as such.

Hi, the reactant that is not used up when the reaction is finished is simply called excess reactant or excess reagent.

Jonathan Malau 1F

While I understand the procedure, why is it that being able to round to a significant figure important in chemistry?

Jonathan Malau 1F

The order depends on the chemical equation itself. However, I find that by beginning with balancing the element that "occurs the least", it makes the process much more straight-forward.

Jonathan Malau 1F

Thank you for your advice Ashley. It has inspired me to truly want to become more proactive in my studies. Hope all has been well. Do you have any tips for an incoming Freshman as to how to be more consistent to avoid "burning out"?

Search found 82 matches