Search found 61 matches

by Millicent Navarro 1I
Thu Mar 14, 2019 7:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 908001

Re: Post All Chemistry Jokes Here

Lose an electron? Gotta keep ion it.
by Millicent Navarro 1I
Thu Mar 14, 2019 7:27 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: units
Replies: 7
Views: 192

Re: units

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.
by Millicent Navarro 1I
Thu Mar 14, 2019 7:24 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Intermediate vs catalyst
Replies: 8
Views: 86

Re: Intermediate vs catalyst

Catalyst: There to begin with
Intermediate: Formed, not reactant/product
by Millicent Navarro 1I
Thu Mar 14, 2019 7:15 pm
Forum: Student Social/Study Group
Topic: Studying for the Final
Replies: 25
Views: 569

Re: Studying for the Final

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.
by Millicent Navarro 1I
Wed Mar 06, 2019 9:49 pm
Forum: Van't Hoff Equation
Topic: Temp Units
Replies: 11
Views: 220

Re: Temp Units

Kelvin! When you write out the Van’t Hoff equation, the K cancels out from the R constant.
by Millicent Navarro 1I
Wed Mar 06, 2019 9:45 pm
Forum: Administrative Questions and Class Announcements
Topic: Class Curve
Replies: 11
Views: 405

Re: Class Curve

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...
by Millicent Navarro 1I
Wed Mar 06, 2019 9:41 pm
Forum: Second Order Reactions
Topic: graph for second order
Replies: 7
Views: 99

Re: graph for second order

The graph for the second-order reaction is a straight positive slope line with an equation of k=-slope.
by Millicent Navarro 1I
Wed Mar 06, 2019 9:38 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Test #2
Replies: 10
Views: 176

Re: Test #2

Students should get their test #2 this week (Week 9) during their section time.
by Millicent Navarro 1I
Tue Feb 19, 2019 5:56 pm
Forum: Student Social/Study Group
Topic: Test
Replies: 17
Views: 349

Re: Test

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.
by Millicent Navarro 1I
Tue Feb 19, 2019 5:54 pm
Forum: Student Social/Study Group
Topic: Best Midterm Review
Replies: 7
Views: 140

Re: Best Midterm Review

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...
by Millicent Navarro 1I
Tue Feb 19, 2019 5:53 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Final exam
Replies: 8
Views: 187

Re: Final exam

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.
by Millicent Navarro 1I
Tue Feb 19, 2019 5:50 pm
Forum: General Rate Laws
Topic: test 3
Replies: 6
Views: 127

Re: test 3

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.
by Millicent Navarro 1I
Tue Feb 19, 2019 5:34 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: What to do when temperature isn't given
Replies: 8
Views: 119

Re: What to do when temperature isn't given

A common general temperature seen throughout problems is 25C. However, most of the time the temperature is given.
by Millicent Navarro 1I
Sun Feb 10, 2019 8:07 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Study Guides
Replies: 15
Views: 305

Re: Study Guides

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.
by Millicent Navarro 1I
Sun Feb 10, 2019 7:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 39
Views: 38504

Re: Tutoring? [ENDORSED]

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 ?
by Millicent Navarro 1I
Sun Feb 10, 2019 5:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 8
Views: 157

Re: Midterm

Last Friday, Lavelle said everything up until entropy will be on the midterm.
by Millicent Navarro 1I
Sun Feb 10, 2019 5:00 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm [ENDORSED]
Replies: 48
Views: 976

Re: Midterm [ENDORSED]

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.
by Millicent Navarro 1I
Fri Feb 01, 2019 1:25 am
Forum: Calculating Work of Expansion
Topic: Work
Replies: 5
Views: 76

Re: Work

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).
by Millicent Navarro 1I
Fri Feb 01, 2019 1:22 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work
Replies: 3
Views: 68

Re: Work

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.
by Millicent Navarro 1I
Fri Feb 01, 2019 1:18 am
Forum: Phase Changes & Related Calculations
Topic: J vs. kJ
Replies: 9
Views: 127

Re: J vs. kJ

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.)
by Millicent Navarro 1I
Thu Jan 31, 2019 4:01 pm
Forum: Phase Changes & Related Calculations
Topic: What Does U and q stand for?
Replies: 9
Views: 141

Re: What Does U and q stand for?

ΔU = q+w

ΔU = Internal Energy
q = Net heat transfer in the system
w = Work being done in the system
by Millicent Navarro 1I
Thu Jan 31, 2019 3:45 pm
Forum: Phase Changes & Related Calculations
Topic: Test #1
Replies: 11
Views: 178

Re: Test #1

Yes, your TA will distribute your test during this week's section.
by Millicent Navarro 1I
Thu Jan 31, 2019 3:45 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Work Question
Replies: 4
Views: 67

Re: Work Question

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).
by Millicent Navarro 1I
Thu Jan 31, 2019 3:39 pm
Forum: Ideal Gases
Topic: atm vs. bar?
Replies: 23
Views: 423

Re: atm vs. bar?

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.
by Millicent Navarro 1I
Mon Jan 14, 2019 2:57 pm
Forum: Ideal Gases
Topic: R in PV=nRT
Replies: 11
Views: 174

Re: R in PV=nRT

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.
by Millicent Navarro 1I
Mon Jan 14, 2019 2:53 pm
Forum: General Science Questions
Topic: Lecture Powerpoints
Replies: 9
Views: 263

Re: Lecture Powerpoints

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.
by Millicent Navarro 1I
Mon Jan 14, 2019 2:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Test Dates
Replies: 3
Views: 77

Re: Test Dates

Test 1 starts Tuesday January 22 (Week 3) in discussion section and Test 2 starts Tuesday February 26 (Week 8) in discussion section.
by Millicent Navarro 1I
Mon Jan 14, 2019 2:47 pm
Forum: Student Social/Study Group
Topic: New to Lavelle
Replies: 32
Views: 616

Re: New to Lavelle

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.
by Millicent Navarro 1I
Mon Jan 14, 2019 2:46 pm
Forum: Ideal Gases
Topic: Units
Replies: 19
Views: 223

Re: Units

Always use Kelvin! If a problem states a temperature in Celsius (this is very common) or Fahrenheit, convert it to Kelvin.
by Millicent Navarro 1I
Mon Jan 14, 2019 2:42 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 908001

Re: Post All Chemistry Jokes Here

I don't trust atoms. I heard they make up everything.
by Millicent Navarro 1I
Mon Dec 03, 2018 8:55 pm
Forum: Bronsted Acids & Bases
Topic: Difference
Replies: 2
Views: 40

Re: Difference

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

Base:
Bronsted-Lowry definition → Proton acceptor
Lewis definition → Donates e- pair
by Millicent Navarro 1I
Mon Dec 03, 2018 8:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs angular?
Replies: 15
Views: 216

Re: Bent vs angular?

Both bent and angular are the same shape!
by Millicent Navarro 1I
Mon Dec 03, 2018 8:45 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28288

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Hi! Thank you for the workshop and answering all of my burning questions this quarter. I appreciate it!
by Millicent Navarro 1I
Mon Dec 03, 2018 8:45 pm
Forum: Administrative Questions and Class Announcements
Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Replies: 135
Views: 28288

Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]

Hi! Thank you for the workshop and answering all of my burning questions this quarter. I appreciate it!
by Millicent Navarro 1I
Mon Dec 03, 2018 8:44 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 908001

Re: Post All Chemistry Jokes Here

I try to tell Chemistry jokes but there are no reactions.
by Millicent Navarro 1I
Mon Dec 03, 2018 4:40 pm
Forum: Quantum Numbers and The H-Atom
Topic: Degeneracy
Replies: 6
Views: 216

Re: Degeneracy

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.
by Millicent Navarro 1I
Mon Dec 03, 2018 4:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Planar
Replies: 12
Views: 194

Re: Square Planar

The bond angles of a square planar are 90 degrees.
by Millicent Navarro 1I
Mon Dec 03, 2018 4:32 pm
Forum: Naming
Topic: Naming the Shape
Replies: 6
Views: 113

Re: Naming the Shape

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.
by Millicent Navarro 1I
Sat Nov 24, 2018 9:59 pm
Forum: Electronegativity
Topic: octet expansion
Replies: 2
Views: 93

Re: octet expansion

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.
by Millicent Navarro 1I
Sat Nov 24, 2018 9:53 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 8
Views: 375

Re: Formal Charge

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 ...
by Millicent Navarro 1I
Sat Nov 24, 2018 9:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Degeneracy
Replies: 4
Views: 319

Re: Degeneracy

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.
by Millicent Navarro 1I
Sat Nov 24, 2018 9:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework for week 9
Replies: 11
Views: 219

Re: Homework for week 9

I think as long as you have your total amount of 14 problems, you should be good.
by Millicent Navarro 1I
Sat Nov 24, 2018 9:42 pm
Forum: Electronegativity
Topic: Nonmetals?
Replies: 3
Views: 153

Re: Nonmetals?

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.
by Millicent Navarro 1I
Sun Nov 11, 2018 8:52 pm
Forum: Lewis Structures
Topic: Expanded Octets
Replies: 9
Views: 191

Re: Expanded Octets

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.
by Millicent Navarro 1I
Sun Nov 11, 2018 8:49 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Equation
Replies: 13
Views: 2537

Re: Formal Charge Equation

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...
by Millicent Navarro 1I
Sun Nov 11, 2018 8:36 pm
Forum: Bond Lengths & Energies
Topic: Tests
Replies: 5
Views: 133

Re: Tests

Yes!

Test #3: Starting Week 9 - During your discussion section
Final: Finals week - Sunday, December 9 11:30 AM - 2:00 PM
by Millicent Navarro 1I
Thu Nov 01, 2018 3:45 pm
Forum: Lewis Structures
Topic: Most stable lewis
Replies: 3
Views: 86

Re: Most stable lewis

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]
by Millicent Navarro 1I
Thu Nov 01, 2018 3:39 pm
Forum: Quantum Numbers and The H-Atom
Topic: Degeneration
Replies: 3
Views: 115

Re: Degeneration

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.
by Millicent Navarro 1I
Thu Nov 01, 2018 3:31 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 12
Views: 261

Re: Speed of Light

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.
by Millicent Navarro 1I
Sat Oct 27, 2018 5:02 pm
Forum: Student Social/Study Group
Topic: Studying
Replies: 7
Views: 294

Re: Studying

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...
by Millicent Navarro 1I
Sat Oct 27, 2018 4:57 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Meaning of Z
Replies: 5
Views: 130

Re: Meaning of Z

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.
by Millicent Navarro 1I
Wed Oct 24, 2018 12:53 am
Forum: Trends in The Periodic Table
Topic: Test 2
Replies: 3
Views: 99

Re: Test 2

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...
by Millicent Navarro 1I
Sun Oct 21, 2018 6:41 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 16
Views: 193

Re: Work Function

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.
by Millicent Navarro 1I
Thu Oct 18, 2018 1:39 pm
Forum: Einstein Equation
Topic: The symbol v?
Replies: 16
Views: 411

Re: The symbol v?

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.
by Millicent Navarro 1I
Tue Oct 16, 2018 11:08 pm
Forum: Properties of Light
Topic: Test 2
Replies: 17
Views: 269

Re: Test 2

To answer some of the questions above, Test 2 will start on Tuesday, October 23 during your discussion section (next week!)
by Millicent Navarro 1I
Thu Oct 11, 2018 10:23 am
Forum: Einstein Equation
Topic: sig fig numbers
Replies: 4
Views: 79

Re: sig fig numbers

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!
by Millicent Navarro 1I
Thu Oct 11, 2018 10:17 am
Forum: Limiting Reactant Calculations
Topic: Test 1
Replies: 8
Views: 454

Re: Test 1

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...
by Millicent Navarro 1I
Thu Oct 11, 2018 10:11 am
Forum: Significant Figures
Topic: Calculators
Replies: 16
Views: 499

Re: Calculators

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!
by Millicent Navarro 1I
Sat Oct 06, 2018 8:20 pm
Forum: Significant Figures
Topic: Rounding numbers ending in 5
Replies: 9
Views: 131

Re: Rounding numbers ending in 5

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.
by Millicent Navarro 1I
Sat Oct 06, 2018 8:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 39
Views: 38504

Re: Tutoring? [ENDORSED]

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...
by Millicent Navarro 1I
Sat Oct 06, 2018 7:57 pm
Forum: Empirical & Molecular Formulas
Topic: homework problem F9
Replies: 3
Views: 77

Re: homework problem F9

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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