CHEMISTRY COMMUNITY

Millicent Navarro 1I

Lose an electron? Gotta keep ion it.

Millicent Navarro 1I

Pressure has a variety of units. Because of this, I double check the units of all the givens so I know which pressure unit to use when solving a problem.

Millicent Navarro 1I

Catalyst: There to begin with
Intermediate: Formed, not reactant/product

Millicent Navarro 1I

I have been going to UA sessions and doing plenty of homework problems! That way, I am exposed to the different questions that may be asked during the exam.

Millicent Navarro 1I

Kelvin! When you write out the Van’t Hoff equation, the K cancels out from the R constant.

Millicent Navarro 1I

On the syllabus, it states, "50% or higher is required to pass with a C- or higher." Therefore, if your overall grade in the class is 50% or higher, you pass the class. However, I am not entirely sure about the breakdown...

Millicent Navarro 1I

The graph for the second-order reaction is a straight positive slope line with an equation of k=-slope.

Millicent Navarro 1I

Students should get their test #2 this week (Week 9) during their section time.

Millicent Navarro 1I

My TA specified Test 2 will most likely circulate thermodynamics. However, I am sure Gibbs free energy will be a part of it too since we are currently learning about it.

Millicent Navarro 1I

Personally, I think attending UA sessions are really helpful (i.e., Lyndon and Karen). The UAs usually provide you worksheets for you to work on prior to the workshop so you get a chance to practice the actual content. In addition, it is nice to have another former student's perspective on the actua...

Millicent Navarro 1I

The final exam is on Sunday, March 17th from 11:30 AM -2:30 PM! Usually, Lavelle posts the exam locations near the date of the exam.

Millicent Navarro 1I

Although it is not stated yet on the website, my TA specified Test 2 will most likely circulate thermodynamics. However, I am sure Gibbs free energy will be a part of it too since we are currently learning about it.

Millicent Navarro 1I

A common general temperature seen throughout problems is 25C. However, most of the time the temperature is given.

Millicent Navarro 1I

A lot of the UA sessions provide worksheets for students to use. For example, Lyndon and Karen provide online worksheets for student to access during their workshops or individual study time.

Millicent Navarro 1I

On some occasions, you can contact your TA and try scheduling an appointment outside of office hours to get further assistance.

jlinwashington1D wrote:Are there any one on one sessions ?

Millicent Navarro 1I

Last Friday, Lavelle said everything up until entropy will be on the midterm.

Millicent Navarro 1I

Personally, what really helps me prepping for exams attending UA workshops. There are a variety of selections (i.e., drop-in, workshops, step-up) for you to choose from depending on your mastery.

Millicent Navarro 1I

When given the term of work, I think of the amount of energy being transferred from one form to another in order to do something. Personally, some keywords that help when determining work are: work being done (positive), does/doing (negative).

Millicent Navarro 1I

Personally, what helps me the most is by looking at the keywords the problem is giving me. For example, if I see "work being done", I automatically assume it is positive because there is energy being entered on a system.

Millicent Navarro 1I

It depends on what the question is specifically asking. However, it is crucial to make sure that as you are solving a problem, all the units are consistent (i.e., if you are using just Joules, make sure it is just Joules.)

Millicent Navarro 1I

ΔU = q+w

ΔU = Internal Energy
q = Net heat transfer in the system
w = Work being done in the system

Millicent Navarro 1I

Yes, your TA will distribute your test during this week's section.

Millicent Navarro 1I

When I think of work, I think of the amount of energy transferred from one form to another in order to do something. Some keywords that help when determining work are: work being done (positive), does/doing (negative).

Millicent Navarro 1I

Both atm and bar are units of partial pressures of gases! However, it's important you stick to just one or the other when calculating equilibrium constant with pressure.

Millicent Navarro 1I

PV=nRT is the Ideal Gas Law equation. To answer your question, the R is the ideal gas law constant and there are varying corresponding values (for the most part, problems will specify which value to use.) Some examples can include bar or atm.

Millicent Navarro 1I

From my experience, the lecture slides are not posted anywhere. However, if you ever find yourself unable to keep up with the slides, Lavelle does have three lectures MWF that you can catch up on.

Millicent Navarro 1I

Test 1 starts Tuesday January 22 (Week 3) in discussion section and Test 2 starts Tuesday February 26 (Week 8) in discussion section.

Millicent Navarro 1I

Personally, I found going to the UA workshops very helpful. Depending on how you feel on the mastery of the course, you can choose which workshop fits for you (Step-Up, Drop-In, Workshop)! That being said, there are plenty of resources for you to be able to choose from to succeed in this class.

Millicent Navarro 1I

Always use Kelvin! If a problem states a temperature in Celsius (this is very common) or Fahrenheit, convert it to Kelvin.

Millicent Navarro 1I

I don't trust atoms. I heard they make up everything.

Millicent Navarro 1I

Acid:
Bronsted-Lowry definition → Proton donor
Lewis definition → Accepts e- pair

Base:
Bronsted-Lowry definition → Proton acceptor
Lewis definition → Donates e- pair

Millicent Navarro 1I

Both bent and angular are the same shape!

Millicent Navarro 1I

Hi! Thank you for the workshop and answering all of my burning questions this quarter. I appreciate it!

Millicent Navarro 1I

Hi! Thank you for the workshop and answering all of my burning questions this quarter. I appreciate it!

Millicent Navarro 1I

I try to tell Chemistry jokes but there are no reactions.

Millicent Navarro 1I

Degeneration refers to all the orbitals having the same energy. For example, the three orbitals in 3p are considered degenerate because they have the same energy. Hope this helps.

Millicent Navarro 1I

The bond angles of a square planar are 90 degrees.

Millicent Navarro 1I

Personally, I think drawing the Lewis structure is most helpful when determining the formal charge. Visually seeing the bonds and lone pairs of each element help reassure you are calculating the charge correctly.

Millicent Navarro 1I

A quick way to think of the "octet expansion involving d-orbitals": Elements that would be considered to have an expanded octet are those in period 3 and beyond because these specific elements can/are able to hold electrons in the d-orbital shell.

Hope this helps.

Millicent Navarro 1I

Personally, the way I look at calculating the formal charge is through this equation: Number of valence electrons - (Lone pairs + Bonds) # of valence electrons: Given through the periodic table based on their period position (Ex: Carbon has 4 V.E. because it is located in Period 4.) Lone pairs: The ...

Millicent Navarro 1I

When speaking in terms of degeneration, this refers to all the orbitals having the same energy. For example, the three orbitals in 3p are considered to be degenerate because they have the same energy.

Millicent Navarro 1I

I think as long as you have your total amount of 14 problems, you should be good.

Millicent Navarro 1I

Nonmetals are usually more electronegative than metals because these specific elements are closer to a full outer shell. Additionally, those who have a higher amount of valence electrons (which is determined through their position in the periodic table) are more electronegative.

Millicent Navarro 1I

Elements that would be considered to have an expanded octet are those in period 3 and beyond because these specific elements can/are able to hold electrons in the d-orbital shell.

Millicent Navarro 1I

The way I look at the formal charge equation is: Number of valence electrons - (Lone pairs + Bonds) # of valence electrons: Given through the periodic table based on their period position Lone pairs: The number of "dots" around an element Bonds: The number of "lines" in between t...

Millicent Navarro 1I

Yes!

Test #3: Starting Week 9 - During your discussion section
Final: Finals week - Sunday, December 9 11:30 AM - 2:00 PM

Millicent Navarro 1I

The most stable Lewis structure is determined by finding a structure that has the least formal charge on each atom. In order to find the formal charge of an atom, you use this formula: Formal Charge = [# of valence electrons on atom] – [non-bonded electrons + number of bonds]

Millicent Navarro 1I

Degeneration refers to all the orbitals having the same energy. For example, the three orbitals in 3p are considered degenerate because they have the same energy.

Millicent Navarro 1I

Nothing is faster than the speed of light. There is a theory that only particles with a zero rest mass may travel at the speed of light.

Millicent Navarro 1I

I personally found attending TA office hours helpful. From the TA office hours I have been to, I was able to get a lot of my burning questions answered when I was not able to ask them during lecture or discussion. The TAs were able to personally guide me through different problems (extremely helpful...

Millicent Navarro 1I

For the most part, Z symbolizes the atomic number (or it is also correct referring to it as the number of protons) of an element.

Millicent Navarro 1I

Based on the website, it states, " Test 2 covers all quantum material up to and including quantum numbers (all quantum material up to the end of Week 3 ." Additionally, you can use https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/Chem14A_Outline2_The_Quantum_World.pdf to h...

Millicent Navarro 1I

Josephine Lu 1L wrote:Is the unit of work function Joules, or Joules per photon?

The unit for work function is Joules. Moreover--work function is a measure of energy, and energy is measured in the units of Joules.

Millicent Navarro 1I

Just to reiterate the comment above, there is a difference between the symbols of frequency and velocity. Furthermore, frequency is represented by the Greek letter nu (similar to v but has a curly/curvy edge to it) and velocity is represented by a lowercase v.

Millicent Navarro 1I

To answer some of the questions above, Test 2 will start on Tuesday, October 23 during your discussion section (next week!)

Millicent Navarro 1I

When it comes to significant numbers, the rules of thumb I use are:

Multiplication/division: Answers will be in the least number of significant figures
Addition/subtraction: Answers will be in the least number of decimal places

Hope this helps!

Millicent Navarro 1I

I definitely think practice problems help! Not only are you strengthing your skills with the topics you are studying for, but you can familiarize yourself with the way problems can be written for that specific topic and get used to the different terms. In addition, if you feel like you may be strugg...

Millicent Navarro 1I

Personally, I always brought a scientific calculator with me for an exam/test. On the Chem14A syllabus, it does say you may only bring "non-programmable and non-graphing calculators". Hope this helps!

Millicent Navarro 1I

Personally, I have always used the method of rounding up whenever the ending number is above 5, so I think you should be good. For your specific example, I would have rounded 2.65 to 2.7.

Millicent Navarro 1I

To add on to all the comments already posted about the different tutoring programs offered at UCLA, I personally found attending TA office hours helpful. From the TA office hours I have been to, I was able to get a lot of my burning questions answered when I was not able to ask them during lecture o...

Millicent Navarro 1I

To begin with, you would first convert the given mass percentages into grams. For example, 63.15% of Carbon would translate to 63.15 grams of Carbon. Following up with answering your question, you divide the number of grams of each element by their respective molar mass (in which can be found throug...

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