CHEMISTRY COMMUNITY

Zoe Staggs 3B

The final exam is not curved, however, due to the difficulty and time limitation of the exam Dr. Lavelle has decided to add on 10 points to every student’s exam.

Zoe Staggs 3B

Yes, organic chemistry is a larger component of Chem 14B which we touched on near the end of 14A.

Zoe Staggs 3B

It’s important to have a system, with one part for learning the material and the other for consolidating it. I recommend reading the textbook to learn the material and then watching the lectures to consolidate your understanding and learn some helpful tips.

Zoe Staggs 3B

Yes, make sure to pay the most attention to Quantum mechanics and fundamentals though! Very important section on the test and it’s help to know which equations to use right off the bat.

Zoe Staggs 3B

You should have a minimum of 5 chemistry community posts per week, but if you have extenuating circumstances or simply forgot, I would reach out to your TA to see what’s acceptable.

Zoe Staggs 3B

A mosquito’s saliva contains an anticoagulant, which allows the mosquito to more easily access your blood. Your body recognizes it as a foreign substance and sends histamine to the nerve cells around the bite. This causes an inflammatory reaction. The amount of histamine released per person is varia...

Zoe Staggs 3B

Go to MyUCLA, and on the upper hand tab click “Exam and homework grades.” The grades should be updated by Saturday this week!

Zoe Staggs 3B

Since K+ and Cl- occupy the same outermost shell, whichever ion with a greater proportion of protons to electrons will be smaller. Therefore Cl- is the larger ion of the two.

Zoe Staggs 3B

Everything from a 50%-73% is a C minus. All grades above a 73% are on a normal scale.

Zoe Staggs 3B

Yes, I had the same problem. I think it was that the questions on the final progressively required more time, so your pacing at the beginning of the exam wasn’t sufficient.

Zoe Staggs 3B

Thank you so much for providing these resources for everyone! It really helps the people who can’t make it to all of the sessions.

Zoe Staggs 3B

I will go to more discussion sessions, UA sessions, and break up my studying so it’s less overwhelming. I’m going to make sure to cover a little bit of material each day.

Zoe Staggs 3B

I’m just doing some light review and doing activities to calm myself down between studying for classes, such as running and listening to music.

Zoe Staggs 3B

Focus and stay calm through all of your finals. Remember to pace yourself; don’t get perfectionistic over one problem when there are many more to answer!

Zoe Staggs 3B

This quarter didn’t go quite as I would have hoped, but I’m thankful for the experience. I’m glad I’ve learned better study habits and what best works for me.

Zoe Staggs 3B

I prefer not to cram the day before, because it usually results in me feeling anxious and unable to sleep. I like to study a lot the days leading up to the exam and save the day before for some light review, exercise, and meditation.

Zoe Staggs 3B

I look forward to resting and taking care of my health. This break is also a great opportunity to reflect on what worked and what didn’t work for me this quarter. I look forward to going into winter quarter with an improved mindset and study habits.

Zoe Staggs 3B

Classical music is great for studying, but I also like to listen to instrumental movie soundtracks. The crown has a great soundtrack.

Zoe Staggs 3B

Chemistry community points are counted up every couple weeks and at the end of the quarter. I recommend checking chemistry community to see how many points you have though so that you know to stay on top of things.

Zoe Staggs 3B

The textbook pretty much covers everything you need to know, but the lectures put everything into context and Dr. Lavelle explains everything in an easier to understand way. I recommend completing the readings and textbook questions before lecture so that the lecture consolidates your understanding ...

Zoe Staggs 3B

It’s common to worry about grades, especially in classes that place a lot of weight on midterms and the final exam. Just make sure to stay on top of your textbook homework and readings. This should give you some relief, and specially when Dr. Lavelle consolidates the material during lecture.

Zoe Staggs 3B

I am spending the holidays in Hawaii with my family. As for movie recommendations, I just saw 1917 and loved it! Great soundtrack and cinematography.

Zoe Staggs 3B

I think to myself — the worse case scenario is that I fail the class. If I do fail, I can use that as an opportunity to grow and improve my study habits even more for the future. So ruminating does nothing good; if you worry about something you experience the thing you feared twice. So the only prod...

Zoe Staggs 3B

Final grades with the 10 bonus points should be up by Saturday!

Zoe Staggs 3B

I will spending the holidays in Hawaii with family and hopefully getting lots of sun.

Zoe Staggs 3B

I plan to do a couple of textbook questions and reading everyday. This way I won’t feel overwhelmed and will retain the information better since I’m only reviewing a little bit each day. This approach requires a lot of self discipline though.

Zoe Staggs 3B

After coming down with mono this quarter, I lacked energy and felt overwhelmed when trying the to get caught up with the material. What helped me was making a schedule that included when I would do readings and homework far in advance. I would also try and include breaks with a reward for some more ...

Zoe Staggs 3B

I would recommend reviewing the weekly graded sapling homework a little bit each day. Save some of your notes as well so you can review them if you come across a related 14B topic and want to brush up.

Zoe Staggs 3B

There is no curve, but an extra 10 points will be added on to each student’s exam. Additionally, all grades higher than 50% are considered a C-

Zoe Staggs 3B

I had the same experience! I felt pretty confident in the earlier questions and maintained that pace. However, I felt like each question progressively required more time so I ended up rushing towards the end and ended up leaving a couple of questions unanswered. I feel like the test would have gone ...

Zoe Staggs 3B

Personally, it helps to meditate or practice visualization a couple of hours before the exam, opposed to cramming up until test.

Zoe Staggs 3B

Will the fundamentals covered in week 1 be on the first midterm, or just the quantum world?

Zoe Staggs 3B

EMR has both wavelike and particle like behaviors. For example, in the wave model, the intensity of radiation is proportional to the square of the amplitude. In the particle model, the intensity is proportional to the number of photons. EMR radiation also exhibits wavelike diffraction patterns.

Zoe Staggs 3B

N2 is the higher energy level while n1 is the lower, and final energy level. This value should always be positive, and since you are subtracting fractions, you can remember that it's the smaller energy level minus the greater energy level.

Zoe Staggs 3B

Hi! I was confused as well but thankfully this material will not be on the upcoming midterm. I would still complete the entire 1D section to understand the concept of electron orbitals.

Zoe Staggs 3B

Radio waves have the lowest frequency on the EMR spectrum and therefore the lowest energy per photon. The equation E per photon = hv explains this concept.

Zoe Staggs 3B

My steps are as follows: 1. Find the frequency of the wavelength 3x10^8/8.1x10^-7m 2. Multiply by Planck's Constant to get the total energy of photons 3. Subtract work function from this value (need to convert eV to Joules) 4. Set this value equal to KE (1/2mv^2) and solve for v 5. Use the De Brogli...

Zoe Staggs 3B

This equation follows conservation of mass. There is a certain minimum frequency of light needed to emit electrons from metal. After it exceeds this minimum value, electrons are emitted with an excess kinetic energy. This is where KE (1/2mv^2) comes to play in this equation.

Zoe Staggs 3B

I think we just need to know about Black Body Radiation in relation to the Stefan Boltzmann Law, Ultraviolet Catastrophe, Photoelectric Effect, etc.

Zoe Staggs 3B

C is the correct answer because the "extend of change of the electric field" corresponds to the amplitude of the wave, which makes sense since the amplitude is essentially the extent the wave rises and falls.

Zoe Staggs 3B

The electrons are given a certain kinetic energy after EMR is emitted at a specific frequency and therefore exceeds the threshold energy. The equation hv - threshold energy = KE should explain it. When the threshold energy is met, it means an electron is being emitted for each photon released.

Zoe Staggs 3B

Does anyone know how many formulas/constants/conversions will be available on our formula sheet prior to the midterm? Will we need to remember constants such as Avogadro's number, Rydberg constant, and conversions such as how to convert between Joules and eV, etc? It just seems like a lot of informa...

Zoe Staggs 3B

I just looked over your work and everything looks correct. I like to think of these types of problems in the order of grams of reactant - moles of reactant - ratio of product - moles of product - grams of product (if the problem asks for it).

Zoe Staggs 3B

A molecule is a group of multiple atoms bonded together, while a mole is 6.0221409e23 atoms of any substance. For example, a mole of the molecule C6H12O6 would consist of 6.0221409e23 atoms.

Zoe Staggs 3B

Stoichiometric coefficients are typically just a unit meant to indicate a ratio. However, this can be representative of a ratio of moles of a substance.

Zoe Staggs 3B

You would typically use Avogadro's number when a problem asks for the number of particles/atoms in a certain number of moles or grams of a substance. A problem may also give you the number of atoms and ask for the amount of moles or grams in that sample.

Zoe Staggs 3B

First, it's important to understand the combustion equation of caproic acid, which is C?H?O? + O2 = CO2 + H2O. Although there is additional mass from the oxygen in the combustion reaction, C and H remain the same, meaning you can simply subtract the masses of carbon and hydrogen from the 1.000 g sam...

Zoe Staggs 3B

First, find the molar mass of the products (H2O and and CO2). Then divide the grams of each by the molar mass to find the moles of each substance. There will be the same amount of moles in carbon as there are in CO2 since there is only one carbon, and there will twice the amount of moles of hydrogen...

Zoe Staggs 3B

First, find the molar mass of the products (H2O and and CO2). Then divide the grams of each by the molar mass to find the moles of each substance. There will be the same amount of moles in carbon as there are in CO2 since there is only one carbon, and there will twice the amount of moles of hydrogen...

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