Search found 51 matches

by Daniela_Martinez_3B
Wed Dec 16, 2020 1:01 pm
Forum: Student Social/Study Group
Topic: Plans for Relaxing After Finals
Replies: 97
Views: 455

Re: Plans for Relaxing After Finals

I going to binge watch some Netflix, but I'm mostly looking forward to reading more books!
by Daniela_Martinez_3B
Wed Dec 16, 2020 12:59 pm
Forum: Student Social/Study Group
Topic: Changing Study Habits
Replies: 35
Views: 186

Re: Changing Study Habits

same here. I regret not attending UA sessions! Next quarter I definitely want to improve my time management so that I can attend those regularly.
by Daniela_Martinez_3B
Wed Dec 16, 2020 12:52 pm
Forum: Student Social/Study Group
Topic: Anxiety
Replies: 42
Views: 238

Re: Anxiety

Finals week is tough, but a cup of tea always helps me calm my nerves
by Daniela_Martinez_3B
Fri Dec 11, 2020 10:15 pm
Forum: Electronegativity
Topic: Textbook Problem: 2D#3
Replies: 3
Views: 28

Re: Textbook Problem: 2D#3

I'm not sure if there is another way to determine ionic character besides difference in electronegativity, but if there is I would also like to know
by Daniela_Martinez_3B
Fri Dec 11, 2020 10:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8528
Views: 1473765

Re: Post All Chemistry Jokes Here

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, “No, I’m traveling light.”
by Daniela_Martinez_3B
Fri Dec 11, 2020 9:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron Geometry
Replies: 8
Views: 54

Re: Electron Geometry

electron geometry takes into account both bond electron pairs and lone electron pairs whilst molecular geometry only takes into account bond electron pairs
by Daniela_Martinez_3B
Sat Dec 05, 2020 9:46 pm
Forum: Naming
Topic: en
Replies: 8
Views: 76

Re: en

en is ethylenediamine (H2NCH2CH2NH2)
by Daniela_Martinez_3B
Sat Dec 05, 2020 9:34 pm
Forum: General Science Questions
Topic: Chemistry Behind Mosquito Bites
Replies: 6
Views: 72

Re: Chemistry Behind Mosquito Bites

I think their saliva triggers a histamine release which is what causes the itchiness.
by Daniela_Martinez_3B
Fri Dec 04, 2020 10:42 pm
Forum: Student Social/Study Group
Topic: How are you?
Replies: 111
Views: 759

Re: How are you?

I'm also stressed about finals, but I'm determined to end on a good note! Also, really excited for winter break :)
by Daniela_Martinez_3B
Fri Dec 04, 2020 10:33 pm
Forum: Sigma & Pi Bonds
Topic: pi bonds
Replies: 13
Views: 107

Re: pi bonds

The organic chemistry tutor on youtube has a great video on sigma and pi bonds that really helped me visualize them!
by Daniela_Martinez_3B
Fri Dec 04, 2020 10:28 pm
Forum: Student Social/Study Group
Topic: Practice Exam for Final
Replies: 23
Views: 250

Re: Practice Exam for Final

My friend who previously took this class said she didn't get her final back when she took it, so I think your best bet is to study the textbook problems.
by Daniela_Martinez_3B
Sat Nov 28, 2020 10:44 pm
Forum: Student Social/Study Group
Topic: Final Study
Replies: 32
Views: 199

Re: Final Study

yeah I think redoing the homework problems since week 1 will be best and it's a good idea to start doing those this week
by Daniela_Martinez_3B
Sat Nov 28, 2020 6:24 pm
Forum: Sigma & Pi Bonds
Topic: Delocalized Pi bond
Replies: 6
Views: 51

Re: Delocalized Pi bond

A delocalized pi bond is a pi bond in which the electrons are free to move over more than two nuclei. A regular pi bond is a localized pi bond in which the bonded electrons are confined to a concentrated region between two separate atoms.
by Daniela_Martinez_3B
Fri Nov 27, 2020 10:06 pm
Forum: Empirical & Molecular Formulas
Topic: Periodic Table and Calculations
Replies: 20
Views: 161

Re: Periodic Table and Calculations

I think any scientific calculator should be okay. As for the periodic table, I go back and forth between the one professor Lavelle gave us and one that I found online that has more info.
by Daniela_Martinez_3B
Tue Nov 24, 2020 10:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Simulation
Replies: 2
Views: 29

Re: VSEPR Simulation

This is super helpful, thank you!!!
by Daniela_Martinez_3B
Tue Nov 24, 2020 7:36 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 30
Views: 152

Re: Polarity

if the dipole moments cancel out it's non-polar!
by Daniela_Martinez_3B
Sun Nov 22, 2020 9:49 pm
Forum: Molarity, Solutions, Dilutions
Topic: mmol
Replies: 14
Views: 170

Re: mmol

1 millimole = 10^-3 moles
by Daniela_Martinez_3B
Sun Nov 22, 2020 7:11 pm
Forum: Lewis Structures
Topic: Central Atom Question
Replies: 20
Views: 143

Re: Central Atom Question

Hydrogen will never be a central atom because it never forms more than one bond!
by Daniela_Martinez_3B
Sun Nov 22, 2020 7:03 pm
Forum: Student Social/Study Group
Topic: How to relax after midterms
Replies: 54
Views: 262

Re: How to relax after midterms

Taking my dogs for a walk really helps me relax, but I also like to binge watch some netflix!
by Daniela_Martinez_3B
Sun Nov 22, 2020 6:57 pm
Forum: Student Social/Study Group
Topic: Big Sad: Midterm 2
Replies: 86
Views: 867

Re: Big Sad: Midterm 2

I feel the same way, but I'm not letting it discourage me! All we can do is move forward and study harder for the final :) you got this!!
by Daniela_Martinez_3B
Sun Nov 22, 2020 6:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling HW #3
Replies: 3
Views: 48

Re: Sapling HW #3

This molecule has 6 electron dense areas (5 outer atoms and one lone pair) so you can expect a square pyramidal geometry. The lone pair on the central atom is pushing the other atoms closer and so the bond angles will be slightly less than 90 degrees and 180 degrees.
by Daniela_Martinez_3B
Sun Nov 15, 2020 7:20 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook 1E.19
Replies: 1
Views: 20

Re: Textbook 1E.19

For Sb the normal configuration would be [Kr] 4d^10 5s^2 5p^3, but the questions asks for Sb^(3+) which means it has lost 3 electrons and so it becomes [Kr] 4d^10 5s^2 For Sn the normal configuration would be [Kr]4d^10 5s^2 5p^2, but the questions asks for Sn^(4+) which means it has lost 4 electrons...
by Daniela_Martinez_3B
Sun Nov 15, 2020 5:49 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Textbook 1E#9
Replies: 3
Views: 34

Re: Textbook 1E#9

Yes, you're correct for part a! For part b, it's invalid because l=0 so ml must also equal 0. Part c is also invalid because the maximum value l can have is n-1 and n=4 so lmax=3.
by Daniela_Martinez_3B
Sat Nov 14, 2020 10:58 pm
Forum: Dipole Moments
Topic: Sapling number 17
Replies: 10
Views: 78

Re: Sapling number 17

LDF are the only intermolecular force that exists between non polar molecules or atoms. You can tell if a molecule will be non polar if 1) the molecular shape around the central atom has no lone pairs, or if it does it's either square planar or linear 2) all atoms around the central atom are the sam...
by Daniela_Martinez_3B
Sat Nov 14, 2020 7:09 pm
Forum: Coordinate Covalent Bonds
Topic: Hydrogen bonding
Replies: 15
Views: 112

Re: Hydrogen bonding

I believe Dr. Lavelle addressed this during his office hours, but yes hydrogen bonding is its own thing!
by Daniela_Martinez_3B
Sat Nov 14, 2020 7:04 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 22
Views: 135

Re: Midterm 2

I'm definitely going to focus more on the textbook problems! The sapling problems and my lecture notes aren't really a priority, but I'll still take some time to review those too.
by Daniela_Martinez_3B
Sun Nov 08, 2020 12:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Question for Students about High School Chem
Replies: 25
Views: 122

Re: Question for Students about High School Chem

Hey! I also took regular high school chem and most of the material we've covered in this class is completely new to me. I didn't learn much in high school chem besides some of the topics on the fundamental section.
by Daniela_Martinez_3B
Sun Nov 08, 2020 12:00 am
Forum: Student Social/Study Group
Topic: Studying From Home
Replies: 91
Views: 491

Re: Studying From Home

I feel you! It's really easy to get distracted at home, so it's really important to have a designated place where you can study with no distractions. I definitely recommend using the pomodoro technique. I also like listening to lofi beats on youtube to help me focus lol.
by Daniela_Martinez_3B
Sat Nov 07, 2020 11:45 pm
Forum: Resonance Structures
Topic: Rules for Determining Favored Structure
Replies: 8
Views: 34

Re: Rules for Determining Favored Structure

Resonance structures with low formal charges are favored over high formal charge!
by Daniela_Martinez_3B
Sat Nov 07, 2020 11:37 pm
Forum: Lewis Structures
Topic: Bond Character
Replies: 6
Views: 82

Re: Bond Character

There's a sapling hw question about whether the bond has ample or overwhelming bond character so I'm really confused on this too! I know that it's essentially asking if the bond is more of a single bond or more of a double bond based on the bond lengths, but the ample/overwhelming thing is really th...
by Daniela_Martinez_3B
Sat Nov 07, 2020 11:17 pm
Forum: Trends in The Periodic Table
Topic: # of electrons
Replies: 23
Views: 118

Re: # of electrons

The number of electrons is equal to the number of protons of each element! An atom with a neutral charge is one where the number of electrons is equal to the atomic number. Ions, however, are atoms with extra electrons or missing electrons.
by Daniela_Martinez_3B
Sat Oct 31, 2020 7:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Atom and Ionic Radius
Replies: 4
Views: 57

Re: Atom and Ionic Radius

The gain of an electron adds more electrons to the outermost shell which increases the radius because there are now more electrons further away from the nucleus and there are more electrons to pull towards the nucleus so the pull becomes slightly weaker than of the neutral atom and causes an increas...
by Daniela_Martinez_3B
Sat Oct 31, 2020 7:43 pm
Forum: Ionic & Covalent Bonds
Topic: Main group elements
Replies: 8
Views: 66

Re: Main group elements

I believe the main group elements are any of the chemical elements belonging to the s and p blocks of the periodic table. The main group elements are important because they, along with a few light transition metals, are the most abundant elements in the universe, solar system, and on Earth.
by Daniela_Martinez_3B
Sat Oct 31, 2020 7:31 pm
Forum: Photoelectric Effect
Topic: Lyman Series
Replies: 30
Views: 199

Re: Lyman Series

Yes! Remember that anything in the UV region involves n=1, anything in the visible region involves n=2, and anything in the infrared region involves n=3.
by Daniela_Martinez_3B
Sat Oct 31, 2020 7:28 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 115
Views: 600

Re: How to relax

Midterm season can get really stressful, but it's important to take time for yourself and de-stress! I usually just binge watch tv or read a book!
by Daniela_Martinez_3B
Sat Oct 31, 2020 7:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Sapling Homework
Replies: 8
Views: 56

Re: Sapling Homework

I had the same problem, just input the full electron configuration without the comma and it should work!
by Daniela_Martinez_3B
Sat Oct 24, 2020 10:51 pm
Forum: Properties of Light
Topic: Sapling Randomized Questions
Replies: 5
Views: 35

Re: Sapling Randomized Questions

I think the questions are still being randomized unfortunately!
by Daniela_Martinez_3B
Sat Oct 24, 2020 10:49 pm
Forum: Einstein Equation
Topic: m vs nm
Replies: 66
Views: 461

Re: m vs nm

The questions will probably specify which unit to use! I believe the exam is also multiple choice, so you can tell that way too.
by Daniela_Martinez_3B
Sat Oct 24, 2020 10:41 pm
Forum: Einstein Equation
Topic: Textbook Problem 1A.3
Replies: 9
Views: 55

Re: Textbook Problem 1A.3

Any electromagnetic wave's frequency multiplied by its wavelength equals the speed of light. The speed of light is always 3x10^8!
by Daniela_Martinez_3B
Fri Oct 23, 2020 10:42 pm
Forum: Properties of Light
Topic: MHz to Hz 1A.9
Replies: 3
Views: 35

Re: MHz to Hz 1A.9

The same thing happened to me! In case you couldn't find it, here's the link to the solution's manual with other errors from the textbook https://lavelle.chem.ucla.edu/wp-content/supporting-files/Chem14A/Solution_Manual_Errors_7Ed.pdf
by Daniela_Martinez_3B
Fri Oct 23, 2020 10:24 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 92
Views: 2104

Re: Advice for studying

Hey! I definitely recommend going over the textbook homework problems and any notes you may have written during lectures. If you're still a bit confused on a certain topic, you can find tons of great youtube videos that explain it.
by Daniela_Martinez_3B
Sat Oct 17, 2020 11:06 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1293

Re: How are you studying?

Even though I've already done the homework problems, I plan on picking a few of them and re-doing them to study. I will also go over my lecture/module notes and do some of the problems from the worksheets we work on during the UA workshops!
by Daniela_Martinez_3B
Sat Oct 17, 2020 10:43 pm
Forum: Properties of Light
Topic: Exercise 1A.15
Replies: 3
Views: 51

Re: Exercise 1A.15

I was stuck on this problem too! You can solve this problem by using the Rydberg equation or you can solve it using En=-hR/n^2. However, using the Rydberg equation is faster. Since the line is observed at 102.6nm, we know that it's in the UV region and it must involve n=1. Since the electron is fall...
by Daniela_Martinez_3B
Sat Oct 17, 2020 10:15 pm
Forum: Properties of Light
Topic: Study Advice
Replies: 50
Views: 295

Re: Study Advice

If you're having trouble with the textbook problems, I'd definitely recommend going to the step up sessions/workshops. However, If you're doing well with the material and want extra practice the workshops are good reinforcements too!
by Daniela_Martinez_3B
Fri Oct 16, 2020 10:17 pm
Forum: Quantum Numbers and The H-Atom
Topic: Atomic Spectra Post-Assessment #29
Replies: 4
Views: 35

Re: Atomic Spectra Post-Assessment #29

To solve this problem, you first need to convert 1850nm to m. Then, using the equation E=hc/λ solve for the energy per photon of light. To answer the second question, you can divide the total energy 11J by the energy per photon value you got from the previous question and that will give you the numb...
by Daniela_Martinez_3B
Thu Oct 15, 2020 9:21 pm
Forum: Quantum Numbers and The H-Atom
Topic: Atomic Spectra Post-Assessment #38
Replies: 1
Views: 42

Atomic Spectra Post-Assessment #38

Calculate the frequency of a photon emitted by a hydrogen atom when an electron makes a transition from the fourth to the second principal quantum level.

I'm having some trouble figuring out how to first approach this question. Any help is appreciated thank you :)
by Daniela_Martinez_3B
Fri Oct 09, 2020 8:13 pm
Forum: Limiting Reactant Calculations
Topic: Sapling HW Week 1 Q10
Replies: 4
Views: 96

Re: Sapling HW Week 1 Q10

I'm confused on this too, the sapling answer for my Q10 was off by 1% (78% instead of 77%), but I still got credit for answering 77%. I hope we can get some clarification on how much error sapling allows for as well.
by Daniela_Martinez_3B
Fri Oct 09, 2020 8:00 pm
Forum: Balancing Chemical Reactions
Topic: Fundamental Question E.23
Replies: 3
Views: 85

Re: Fundamental Question E.23

The reason why there are ions is because those compounds are being held together by ionic bonding. Usually if a compound is made up of a metal and a non-metal, its bonding will be ionic. For example, you can check the periodic table and see that Cu is a metal and Br is a nonmetal, so the compound Cu...
by Daniela_Martinez_3B
Fri Oct 09, 2020 7:39 pm
Forum: SI Units, Unit Conversions
Topic: Mole ratios: Don't forget them; how to convert g of one compound to g to an another compound/element.
Replies: 4
Views: 67

Re: Mole ratios: Don't forget them; how to convert g of one compound to g to an another compound/element.

Agreed! This is very important to understand. Almost every time I made a mistake in these kinds of questions, I found myself forgetting to use the molar ratios. Also, it's good to double check that the equation is balanced correctly or else the rest of the problem gets messed up. Your explanation is...
by Daniela_Martinez_3B
Fri Oct 09, 2020 7:30 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.25
Replies: 2
Views: 40

G.25

Practitioners of the branch of alternative medicine known as homeopathy claim that very dilute solutions of substances can have an effect. Is the claim plausible? To explore this question, suppose that you prepare a solution of a supposedly active sub- stance, X, with a molar concentration of 0.10 m...
by Daniela_Martinez_3B
Fri Oct 09, 2020 7:05 pm
Forum: Empirical & Molecular Formulas
Topic: Sapling Hw #10
Replies: 10
Views: 101

Re: Sapling Hw #10

To solve this problem, the first thing you want to do is find the mass of 2-butane by multiplying 0.35mL *0.81g/mL to get the amount in g of 2-butanone. 0.35mL *0.81g/mL= 0.28g Next you need to find the number of moles in 0.28g of 2-butanone by dividing by its molar mass ( 2-butanone's molecular for...

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