Search found 53 matches

by Helena Hu 3E
Wed Dec 09, 2020 3:56 pm
Forum: Bronsted Acids & Bases
Topic: Identifying Strong Acids and Bases
Replies: 7
Views: 53

Re: Identifying Strong Acids and Bases

If you click on the hint part of a question on Sapling, it will link you to a list of strong acids and bases which I find to be really helpful when memorizing them. Also, like Owen said, anything that is not listed on the strong acids or strong bases chart but follows the general formula are most li...
by Helena Hu 3E
Wed Dec 09, 2020 3:53 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pH vs pKa
Replies: 9
Views: 104

Re: pH vs pKa

Adding on to this, pKa is equal to what pH is needed for a chemical species to be able to donate or accept a proton. Hope this helps!
by Helena Hu 3E
Wed Dec 09, 2020 3:52 pm
Forum: Administrative Questions and Class Announcements
Topic: Naming on Final
Replies: 9
Views: 75

Re: Naming on Final

I wouldn't bother memorizing the ones that haven't been seen on HW or in a lecture, but regardless, memorizing them will help you answer questions quicker on the exam. Good luck!
by Helena Hu 3E
Mon Dec 07, 2020 11:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Ebook/Textbook problems
Replies: 9
Views: 83

Re: Ebook/Textbook problems

In the bottom left corner you should see updates like "typesetting math..." etc. Usually reloading the page works for me; it just takes a while for it to load. If not, I would try using a different browser. or closing your window and opening it again. Hope this works!
by Helena Hu 3E
Mon Dec 07, 2020 11:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 10 Review Sessions
Replies: 7
Views: 78

Re: Week 10 Review Sessions

Does anyone know if the sections are the same? If two TAs are both reviewing the same topic will it be the same practice?
by Helena Hu 3E
Wed Dec 02, 2020 11:03 pm
Forum: Naming
Topic: what does (en) mean?
Replies: 23
Views: 157

Re: what does (en) mean?

Is this something common that we will need to know going forward? I always get so confused when I see it come up.
by Helena Hu 3E
Wed Dec 02, 2020 10:57 pm
Forum: Student Social/Study Group
Topic: How are you?
Replies: 111
Views: 754

Re: How are you?

Thanks for asking, Sid. It's always important to ask everyone how they really are; it is so often too easy to glaze over the question by saying we're doing just fine. Personally, I am excited for the holiday season and looking forward to finishing up the quarter strong!
by Helena Hu 3E
Wed Dec 02, 2020 10:55 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 1 and 2 Review
Replies: 8
Views: 86

Re: Midterm 1 and 2 Review

Dr. Lavelle has also said in his emails that he will also go over some commonly missed questions from both midterms in the review lecture.
by Helena Hu 3E
Wed Dec 02, 2020 10:52 pm
Forum: Administrative Questions and Class Announcements
Topic: fall 2020 final
Replies: 17
Views: 181

Re: fall 2020 final

Will it be the same TA discussion link that we used for the last midterm?
by Helena Hu 3E
Wed Dec 02, 2020 10:48 pm
Forum: Student Social/Study Group
Topic: Final Exam Study Tips
Replies: 48
Views: 244

Re: Final Exam Study Tips

I plan on going over the Sapling HW from the previous weeks as well as attending a bunch of the review sections. I think it would be best to try to start studying for the final this week so you know which topics you are weakest with so you can focus on those sections next week.
by Helena Hu 3E
Tue Nov 24, 2020 12:03 pm
Forum: Student Social/Study Group
Topic: Big Sad: Midterm 2
Replies: 86
Views: 861

Re: Big Sad: Midterm 2

I wouldn't want to worry about it too much. MT1 was really tough for me since it was my first ever college exam, and I didn't do as well as I had hoped. But, I let it go since there is nothing I can do about it now, and focused all of my energy on MT2, which I do feel better about. Hopefully this wi...
by Helena Hu 3E
Tue Nov 24, 2020 11:51 am
Forum: Determining Molecular Shape (VSEPR)
Topic: memorization
Replies: 12
Views: 114

Re: memorization

Learning the names for geometry is definitely the most difficult thing for me in this class so far. There are a lot of great charts online but I'm never really sure if the one that I'm looking at includes everything that we need to know, plus you will not have access to a chart on the exam. What I w...
by Helena Hu 3E
Tue Nov 24, 2020 11:43 am
Forum: Bond Lengths & Energies
Topic: Covalent Bond Length
Replies: 13
Views: 129

Re: Covalent Bond Length

Kind of off topic, but touching on the type of bond (single, double, triple bond), the more bonds, the shorter the bond length and thus it is more difficult to break.
A single bond is easier to break and has a longer bond length than a triple bond.
by Helena Hu 3E
Tue Nov 24, 2020 11:37 am
Forum: Student Social/Study Group
Topic: Exercising Our Minds and Bodies
Replies: 103
Views: 507

Re: Exercising Our Minds and Bodies

Thanks everyone for the suggestions! Living in California is such a blessing right now because it's still relatively warm outside to go for a run. I also really enjoy playing tennis -- it's a great workout for your mind and body :)
by Helena Hu 3E
Tue Nov 24, 2020 11:35 am
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Date
Replies: 21
Views: 219

Re: Final Exam Date

Will week 10 be review then?
by Helena Hu 3E
Sat Nov 21, 2020 7:43 pm
Forum: Student Social/Study Group
Topic: Study Tips for Final Exam
Replies: 57
Views: 410

Re: Study Tips for Final Exam

The textbook problems are super great to study from -- there are quite a few calculations in this course, and so for those I would do practice questions. For conceptual questions, reviewing the textbook and answering the learning goals on the question sheets.
by Helena Hu 3E
Sat Nov 21, 2020 7:34 pm
Forum: Student Social/Study Group
Topic: Post Midterm Blues
Replies: 71
Views: 606

Re: Post Midterm Blues

Just remember that you tried your best! Even if you did not do as well as you expected, take this as a learning experience and use this to fuel your motivation for the final!
by Helena Hu 3E
Sat Nov 21, 2020 7:30 pm
Forum: General Science Questions
Topic: Midterm 2
Replies: 8
Views: 136

Re: Midterm 2

I think from now on we will be using our discussion Zoom links instead of a separate one made for the midterm?
by Helena Hu 3E
Sat Nov 21, 2020 7:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Grades
Replies: 6
Views: 139

Re: Midterm 2 Grades

I hope it will be next week before Thanksgiving. Hopefully with no issues it won't take too long :)
by Helena Hu 3E
Sat Nov 21, 2020 7:15 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 226
Views: 35980

Re: Final Jitters

I try not to study the day of because I don't want to stress myself out. I just trust that I did my best with my studying, eat a good breakfast before, get a good nights sleep and believe that you can do it! Good luck!
by Helena Hu 3E
Thu Nov 12, 2020 11:11 pm
Forum: Bond Lengths & Energies
Topic: Bond Strengths
Replies: 10
Views: 79

Re: Bond Strengths

Bond length also correlates to bond strength --> triple bonds are shorter and thus harder to break; single bonds are longer and easier to break.
A stick is harder to break when it is shorter vs when it is long. Hope this helps!
by Helena Hu 3E
Thu Nov 12, 2020 10:53 pm
Forum: Lewis Structures
Topic: Nitrite structure
Replies: 4
Views: 51

Re: Nitrite structure

Do we need to know how to write the molecules given the name like these? I feel like this is a commonly asked question, because it's not on the list of things we need to know, but a lot of the textbook questions ask this.
by Helena Hu 3E
Wed Nov 11, 2020 3:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Questions
Replies: 16
Views: 134

Re: Midterm 2 Questions

I think like he did for MT1, he will send an email beforehand to let us know how many questions there will be on the exam. But yes, I do think there will be more questions. Good luck!
by Helena Hu 3E
Tue Nov 10, 2020 11:57 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Textbook 1D.21
Replies: 2
Views: 36

Re: Textbook 1D.21

That makes so much sense! Thanks!! :)
by Helena Hu 3E
Tue Nov 10, 2020 11:57 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

I also did not take AP Chemistry in high school, but most of the fundamental and "review" topics were somewhat familiar to me-- I knew sig figs, empirical formulas, and such, but what is going to be covered on MT 2 is essentially all new information for me. You're not alone!
by Helena Hu 3E
Mon Nov 09, 2020 10:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Textbook 1D.21
Replies: 2
Views: 36

Textbook 1D.21

Hi everyone, I was wondering if someone could help me out with this question from the textbook: Write the subshell notation (3d, for instance) and the number of orbitals having the following quantum numbers: (a) n=5,l=2; (b) n=1,l=0; (c) n=6,l=3; (d) n=2,l=1 I understand how to write the subshell no...
by Helena Hu 3E
Thu Nov 05, 2020 11:13 pm
Forum: Ionic & Covalent Bonds
Topic: resonance structures
Replies: 2
Views: 22

Re: resonance structures

I think we are limited to single, double, and triple bonds-- I don't exactly know why, so I am probably wrong. I haven't really seen any situation where a resonance structure has a quadruple bonds. I am also curious about this question, so I really hope someone or one of the mods can answer this.
by Helena Hu 3E
Wed Nov 04, 2020 8:58 pm
Forum: Lewis Structures
Topic: Lewis structure for sapling
Replies: 3
Views: 22

Re: Lewis structure for sapling

You only need 1 double bond from a carbon to oxygen, and in turn you must add another lone pair. Additionally, your negative charge should be on 2 different oxygens -- I think you might have accidentally put your charge on a carbon.
Hope this helps!
by Helena Hu 3E
Wed Nov 04, 2020 8:48 pm
Forum: Lewis Acids & Bases
Topic: Octet question
Replies: 7
Views: 63

Re: Octet question

I would just memorize the exceptions --> hydrogen is pretty easy to get since it is one of the most common elements, but take time to know the ones that do not follow the rule. It'll come naturally with a lot of practice. For the most part, elements need to satisfy the octet rule.
Hope this helps!
by Helena Hu 3E
Wed Nov 04, 2020 8:43 pm
Forum: Student Social/Study Group
Topic: How many points for an A and above?
Replies: 10
Views: 139

Re: How many points for an A and above?

I don't think it is a different grading scale, just that there are points assigned to assignments and then however percent you achieve correlates to your grade. It still is one a 0-100 scale, if this is making sense. But like how Hannah said, this is not uncommon for university-level courses. Does a...
by Helena Hu 3E
Wed Nov 04, 2020 8:37 pm
Forum: Lewis Structures
Topic: Valence Electrons
Replies: 10
Views: 67

Re: Valence Electrons

What helps me remember is that like anyone else said, the number at the top of the column shows how many valence electrons there are. However, skipping the transition metals, just remember the number of valence electron is the second number in the column, starting with column 13. For example, an ele...
by Helena Hu 3E
Fri Oct 30, 2020 11:17 pm
Forum: Student Social/Study Group
Topic: How to relax
Replies: 113
Views: 594

Re: How to relax

I think it's really important to spend time away from the screen and to rest your eyes, especially now with all these online classes. I usually like to take a nap and play with my dog. I also think stretching is very necessary because it helps ease the tension in your muscles and prevent you from ha...
by Helena Hu 3E
Fri Oct 30, 2020 11:10 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum
Replies: 7
Views: 70

Re: Electromagnetic Spectrum

I feel like this is just one of those things you have to memorize, just like unit conversions. This is a bit harder because there are no prefixes that give away the information. But, something that helps me remember some parts of the electromagnetic spectrum is that visible light is yellow, like a l...
by Helena Hu 3E
Wed Oct 28, 2020 9:23 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula - Whole Number Ratio
Replies: 9
Views: 85

Re: Empirical Formula - Whole Number Ratio

I think with the questions that we're asked in this course, the rounding should be pretty clear if all the steps were right. With the practice we've had so far with the Sapling hw and the textbook questions, most of the decimals came out to be values like .98 or .002 (things that make it clear where...
by Helena Hu 3E
Wed Oct 28, 2020 9:18 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: position units
Replies: 19
Views: 122

Re: position units

Generally speaking, your answer should always follow SI units (meters, grams, etc.) unless it is specified to be converted to other units. Even then, you should be converting anything that is not the correct SI units, and then converting to the specified units (Angstrom, kg, nm, etc.) at the very en...
by Helena Hu 3E
Wed Oct 28, 2020 9:13 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Midterm Questions
Replies: 4
Views: 61

Re: Midterm Questions

Like Simran said, he called it 11+1 questions in his email, but you can still get partial credit for incorrect answers.
Good luck!
by Helena Hu 3E
Thu Oct 22, 2020 11:22 pm
Forum: General Science Questions
Topic: Using Equations for Problems
Replies: 3
Views: 44

Re: Using Equations for Problems

For me, I write out some of the essential information from the problem, which really means writing down the numbers and what they represent (ex. if the wavelength is given, I'll write lamba=number). After this, I'll write down the equations that I know are involved with these variables and see what ...
by Helena Hu 3E
Thu Oct 22, 2020 11:17 pm
Forum: Properties of Light
Topic: Midterm
Replies: 42
Views: 390

Re: Midterm

How would there be opportunity for partial credit if it is multiple choice? From what I understand if there's for example parts A and B, you don't need to do part A first in order to do part B, which helps you get as many points as possible. Adding on to this, I believe if hypothetically, if you we...
by Helena Hu 3E
Thu Oct 22, 2020 11:14 pm
Forum: Properties of Light
Topic: Units for wavelength/frequency
Replies: 18
Views: 95

Re: Units for wavelength/frequency

While we're on this topic, can someone explain what an Angstrom is and how to convert to it from meters?
by Helena Hu 3E
Wed Oct 21, 2020 10:44 pm
Forum: Einstein Equation
Topic: Scratch paper during the exam
Replies: 19
Views: 153

Re: Scratch paper during the exam

I believe based on what the email from today meant, we should be allowed to have scratch paper outside of the equations sheet and the periodic table. However, we will be required to show the TA the front and back side of the paper to confirm that it is blank. Ultimately it is probably up to you TA, ...
by Helena Hu 3E
Wed Oct 21, 2020 2:55 pm
Forum: General Science Questions
Topic: Lecture Question
Replies: 4
Views: 49

Re: Lecture Question

Like what everyone else said, it is a constant value of 9.109x10^-31. This constant is also listed on Dr. Lavelle's Constants and Equations sheet. You can find this on the Chem14A website. Hope this helps!
by Helena Hu 3E
Wed Oct 21, 2020 2:52 pm
Forum: SI Units, Unit Conversions
Topic: units to know for midterm
Replies: 11
Views: 149

Re: units to know for midterm

Like what the moderator said, I don't think you will need to know them as this class is about application, not memorization. However, if you are really curious, there was a great past thread where people showed what acronyms they used to help memorize them. There is a great explanation there on how ...
by Helena Hu 3E
Sun Oct 18, 2020 3:07 pm
Forum: Significant Figures
Topic: When should I start looking at sig figs?
Replies: 31
Views: 234

Re: When should I start looking at sig figs?

I really recommend using the calculator option that allows you to manipulate your previous answer: I have a TI 84 calculator, and using this i do [2nd --> answer (above negative sign]), This allows you to add, subtract, multiply, divide, etc. by these long decimals so that you have the precise answe...
by Helena Hu 3E
Sun Oct 18, 2020 2:55 pm
Forum: Properties of Electrons
Topic: Electrons Excited or Ejected
Replies: 19
Views: 142

Re: Electrons Excited or Ejected

Mari Williams 2k wrote:Do electrons release energy when they are exited and jump energy levels, or when they fall to lower levels?


Electrons release energy when they fall to to lower levels (a photon of electromagnetic energy is released) . When electrons absorb energy, they jump to higher levels.
by Helena Hu 3E
Sun Oct 18, 2020 2:51 pm
Forum: Photoelectric Effect
Topic: Light Intensity
Replies: 23
Views: 109

Re: Light Intensity

I would think that a greater amplitude of a light wave would mean higher intensity, as well. Hope this helps!
by Helena Hu 3E
Tue Oct 13, 2020 5:14 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical or Molecular
Replies: 11
Views: 110

Re: Empirical or Molecular

hi! To find out if the empirical is the same as the molecular, the molar mass will be provided. Then, you want to find the mass of the empirical formula --> if this is the same value as the molar mass, then you know the empirical and molecular formulas are the same. If not, you will need to multiply...
by Helena Hu 3E
Tue Oct 13, 2020 5:08 pm
Forum: SI Units, Unit Conversions
Topic: Metric Conversions
Replies: 9
Views: 118

Re: Metric Conversions

^^ woah.. I've never heard of that one but it seems a lot better than the one I used to use. Thanks!
The one I've always been taught it
King Henry Died Unusually Drinking Chocolate Milk
K- kilo
H- hecto
D- deca
U- unit (meter, liter, gram, etc.)
D- deci
C- centi
M- milli
by Helena Hu 3E
Sat Oct 10, 2020 2:07 pm
Forum: Balancing Chemical Reactions
Topic: Order of Balancing Rxns
Replies: 23
Views: 115

Re: Order of Balancing Rxns

Similarly to Hannah, I make a list on the reactants side and on the products side-- this helps me the most of keeping track of the numbers. I like to rewrite the equation and leave space at the front of each molecule so that I can fill in the stoichiometric coefficients with a different color. Then,...
by Helena Hu 3E
Sat Oct 10, 2020 1:59 pm
Forum: Administrative Questions and Class Announcements
Topic: What's the best way to study?
Replies: 7
Views: 65

Re: What's the best way to study?

Hi! For me personally, I have found that practice is really important, since what we have learned so far these are concepts you must understand rather than facts to memorize. I definitely intend on doing all of the textbook questions. I definitely think it is important that if you get a practice que...
by Helena Hu 3E
Sat Oct 10, 2020 1:55 pm
Forum: Limiting Reactant Calculations
Topic: Best way to find limiting reactant
Replies: 5
Views: 97

Re: Best way to find limiting reactant

I personally prefer method #1 because it helps me to better visualize which reactant is in excess. This is my first time learning limiting reactants, and so it might just work better for me since it is how I have been practicing-- I don't think it matters which one you choose as long as you show you...
by Helena Hu 3E
Fri Oct 09, 2020 9:59 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic bonds in solutions
Replies: 9
Views: 189

Re: Ionic bonds in solutions

I don't know if I am understanding your question-- are you asking why molecules do not break apart when they are dissolved in aqueous solutions? ex. table salt (NaCl) being dissolved in water? The answer to this example is that water molecules interact with Na to pull the NaCl ions apart. I don't kn...
by Helena Hu 3E
Fri Oct 09, 2020 11:29 am
Forum: Ionic & Covalent Bonds
Topic: Determining Empirical Formula (HW Question)
Replies: 6
Views: 143

Re: Determining Empirical Formula (HW Question)

That makes so much sense-- thanks!! :)
by Helena Hu 3E
Fri Oct 09, 2020 10:10 am
Forum: Ionic & Covalent Bonds
Topic: Determining Empirical Formula (HW Question)
Replies: 6
Views: 143

Determining Empirical Formula (HW Question)

Hi everyone, I am a bit confused on how to go about solving this problem: Caproic acid has the odor of goats. (In fact, Capra is the genus of the domestic goat.) The compound contains only C,H, and O and was experimentally found to have a molar mass of 110±10 g/mol. When a 1.000 g sample of caproic ...

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