Search found 51 matches

by Kendra Barreras 3E
Sat Dec 07, 2019 7:05 pm
Forum: Naming
Topic: latin names
Replies: 3
Views: 59

Re: latin names

Another example would also be plumbate for lead.
by Kendra Barreras 3E
Sat Dec 07, 2019 7:02 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: determining number of hydrogen bonding sites
Replies: 3
Views: 152

Re: determining number of hydrogen bonding sites

Recall that hydrogen bonds can form when a hydrogen that is bonded to a Nitrogen, Oxygen, or Fluorine is strongly attracted to a Nitrogen, Oxygen, or Fluorine with a lone pair. In problems where it asks you to find how many hydrogen bonding sites there are, you should look for the hydrogens bonded ...
by Kendra Barreras 3E
Sat Dec 07, 2019 12:39 pm
Forum: General Science Questions
Topic: Exam Subjects
Replies: 5
Views: 248

Re: Exam Subjects

I really doubt that the exam will be on topics that we haven't yet tested on. It will most likely be an equal distribution of topics from before the midterm and after the midterm. I'm assuming that the exam will be hard, not because of the content, but the combination of different concepts. Or bett...
by Kendra Barreras 3E
Sat Dec 07, 2019 12:37 pm
Forum: General Science Questions
Topic: Exam Subjects
Replies: 5
Views: 248

Re: Exam Subjects

I know the exam is cumulative but I would also assume that material from post-midterm would be more heavily emphasized.
by Kendra Barreras 3E
Sat Dec 07, 2019 12:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam Place
Replies: 3
Views: 77

Re: Final Exam Place

Thank you!
by Kendra Barreras 3E
Sat Dec 07, 2019 12:34 pm
Forum: General Science Questions
Topic: Final
Replies: 3
Views: 200

Re: Final

I'm also wondering the same thing^^^^
by Kendra Barreras 3E
Sun Dec 01, 2019 9:54 pm
Forum: Naming
Topic: Final Exam?
Replies: 20
Views: 252

Re: Final Exam?

It is cumulative and regarding the outlines, just make sure to understand conceptually the topics discussed in each and how they form connections with each other.
by Kendra Barreras 3E
Sun Dec 01, 2019 9:52 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Final Exam
Replies: 10
Views: 165

Re: Final Exam

It is cumulative but I would suppose that more material after the midterm would be emphasized.
by Kendra Barreras 3E
Sun Dec 01, 2019 9:48 pm
Forum: Student Social/Study Group
Topic: Week 10 Chemistry Community
Replies: 9
Views: 329

Re: Week 10 Chemistry Community

How many posts should we have by then?
by Kendra Barreras 3E
Sun Dec 01, 2019 9:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Grades
Replies: 15
Views: 233

Re: Grades

Dr. Lavelle's syllabus says that you need at least a 50% to get a passing grade in the class.
by Kendra Barreras 3E
Sun Dec 01, 2019 9:46 pm
Forum: Bronsted Acids & Bases
Topic: Final
Replies: 13
Views: 199

Re: Final

It'd also be a good idea to look at the outlines he has. All the topics are listed there.
by Kendra Barreras 3E
Sun Nov 24, 2019 12:59 pm
Forum: Biological Examples
Topic: What should we know for the final?
Replies: 9
Views: 551

Re: What should we know for the final?

Without myoglobin, is hemoglobin square planer about Fe? Isn't hemoglobin just 4 myoglobin-like molecules joined together? It should have the same shape I believe? Yea! Myoglobin is a cytoplasmic protein that binds oxygen on a heme group. It harbors only one heme group, whereas hemoglobin has four.
by Kendra Barreras 3E
Sun Nov 24, 2019 12:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Break
Replies: 4
Views: 92

Re: Thanksgiving Break

VioletKo3F wrote:Does anyone know if there's discussion on Wednesday?

Lavelle sent out an email explaining how if discussions were Wednesday after 3pm then they were going to be canceled.
by Kendra Barreras 3E
Sun Nov 24, 2019 12:48 pm
Forum: Administrative Questions and Class Announcements
Topic: Final exam
Replies: 17
Views: 290

Re: Final exam

Yea! Basically everything that we have learned in lecture is fair game for the final.
by Kendra Barreras 3E
Sun Nov 24, 2019 12:46 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted vs. Lewis Acids
Replies: 4
Views: 67

Re: Bronsted vs. Lewis Acids

Haley Pham 4I wrote:Bronsted acids are are proton donors, while Lewis acids are electron acceptors. All Bronsted acids are Lewis acids, but not all Lewis acids are Bronsted acids.

Similarily all Bronsted bases are Lewis bases but not all Lewis bases are Bronsted bases.
by Kendra Barreras 3E
Sun Nov 24, 2019 12:41 pm
Forum: General Science Questions
Topic: Sig Figs
Replies: 7
Views: 131

Re: Sig Figs

Using the correct number of sig figs could never hurt but I would assume that if you don't the loss of points would be minimal.
by Kendra Barreras 3E
Sun Nov 17, 2019 10:28 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 11
Views: 212

Re: Final

Jamie Hwang 3H wrote:Does anyone know if the final will be cumulative of everything we have done this quarter or is it just stuff we learn after the midterm?

It's a cumulative 3 hour final on Sunday, December 8th.
by Kendra Barreras 3E
Sun Nov 17, 2019 10:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 8 HW
Replies: 4
Views: 81

Re: Week 8 HW

I'd personally focus on the material after the midterm that I least understand in order to understand it more for test #2.
by Kendra Barreras 3E
Sun Nov 17, 2019 10:09 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: so2?
Replies: 1
Views: 36

Re: so2?

SO2 has a region of unequal sharing, in which when you draw the VESPR model of it, you see that where the lone pairs are there is a bent shape that is less electronegative. Therefore, the oxygens at the bottom are more negative making SO2 a polar molecule.
by Kendra Barreras 3E
Sun Nov 17, 2019 10:06 pm
Forum: Hybridization
Topic: Test 2
Replies: 11
Views: 137

Re: Test 2

I believe Lavelle said in lecture on Friday that hybridization wouldn't be on the test.
by Kendra Barreras 3E
Sun Nov 17, 2019 10:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 10
Views: 84

Re: Lone Pairs

Lone pairs cause repulsion and this in turn changes the geometrical arrangement.
by Kendra Barreras 3E
Sun Nov 10, 2019 9:41 pm
Forum: General Science Questions
Topic: Midterms
Replies: 22
Views: 338

Re: Midterms

I believe the next test happening on week 8 will have everything from the second part of 2d to the information we get to right before the next test.
by Kendra Barreras 3E
Sun Nov 10, 2019 9:36 pm
Forum: Electronegativity
Topic: Periodic Trend
Replies: 13
Views: 175

Re: Periodic Trend

In general, for electronegativity just remember that Fluorine is the most electronegative and from there it decreases down and to the left from there.
by Kendra Barreras 3E
Sun Nov 10, 2019 9:30 pm
Forum: Electronegativity
Topic: memorizing tables
Replies: 9
Views: 81

Re: memorizing tables

It is important to know the trends going across the table however, I don't think he will ever ask a question regarding specific personalized numbers to an atom.
by Kendra Barreras 3E
Sun Nov 10, 2019 9:25 pm
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 58
Views: 2124

Re: Study Tips

Does anyone have any advice on how to take really good notes during lecture? I usually copy the slides but I always feel like he says some important things, I just never catch them on time since I'm too busying copying what the slides say The first few weeks I would focus too much on taking notes a...
by Kendra Barreras 3E
Sun Nov 10, 2019 8:47 pm
Forum: Lewis Structures
Topic: Electronegative
Replies: 14
Views: 153

Re: Electronegative

As for the trend just remember that Fluorine is the most electronegative atom and therefore it decreases going down and to the left.
by Kendra Barreras 3E
Sun Nov 10, 2019 8:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Writing e- Configurations
Replies: 15
Views: 205

Re: Writing e- Configurations

Usually the question will be specific regarding what it wants, but my TA said that unless it states to do the FULL electron configuration to just do the notation using the noble gas.
by Kendra Barreras 3E
Sun Nov 10, 2019 8:38 pm
Forum: Electronegativity
Topic: Electron Affinity and Electronegativity
Replies: 7
Views: 66

Re: Electron Affinity and Electronegativity

Electron affinity is the amount of energy released when an electron is added to the neutral atom, mean while electronegativity is the tendency of an atom to attract an electron towards it.
by Kendra Barreras 3E
Sun Nov 10, 2019 8:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Second Discussion Test
Replies: 9
Views: 160

Re: Second Discussion Test

So for the 2nd test there will only be material from after the midterm?
by Kendra Barreras 3E
Sun Nov 10, 2019 8:28 pm
Forum: Administrative Questions and Class Announcements
Topic: Commuters
Replies: 3
Views: 61

Re: Commuters

I would say stay on campus as long as possible and really take advantage of the breaks between your classes. Although review sessions do help, they aren't mandatory to be successful in the class and as long as you understand the information conceptually and practice homework/additional problems you ...
by Kendra Barreras 3E
Sun Nov 10, 2019 8:24 pm
Forum: Student Social/Study Group
Topic: Midterm Average
Replies: 12
Views: 266

Re: Midterm Average

What was the average for test #1?
by Kendra Barreras 3E
Sun Oct 27, 2019 10:37 pm
Forum: Ionic & Covalent Bonds
Topic: periodic table
Replies: 10
Views: 123

Re: periodic table

Both electronegativity and ionization energy increases from left to right. The same is true for electron affinity. the opposite however is true for the atomic radius.
by Kendra Barreras 3E
Sun Oct 27, 2019 10:34 pm
Forum: Electronegativity
Topic: Finding Electronegativity
Replies: 2
Views: 67

Re: Finding Electronegativity

The electronegativity trend increases from left to right and from bottom up. Therefore the order would be indium, tin, antimony, and finally selenium. (increasing as you go from left to right)
by Kendra Barreras 3E
Sun Oct 27, 2019 10:26 pm
Forum: Lewis Structures
Topic: Orbitals
Replies: 9
Views: 114

Re: Orbitals

Yes because what comes before it is 3d10 and because 4s2 is in n=4 you remove from t first.
by Kendra Barreras 3E
Sun Oct 27, 2019 10:19 pm
Forum: Lewis Structures
Topic: Choosing the central atom
Replies: 16
Views: 202

Re: Choosing the central atom

It typically is the one with the lowest ionization energy.
by Kendra Barreras 3E
Sun Oct 27, 2019 10:14 pm
Forum: Ionic & Covalent Bonds
Topic: electron configuration order
Replies: 6
Views: 124

Re: electron configuration order

5s comes before, but don't worry too much about the f-block since Dr. Lavelle stated in lecture that we wouldn't really be dealing with it.
by Kendra Barreras 3E
Sun Oct 20, 2019 10:40 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Frequencies
Replies: 7
Views: 179

Re: Frequencies

I think it would definitely be helpful to know the difference and in which categories the Lyman and Balmer series fall on. Also, there is a homework question that asks to order wavelengths in order of energy (or might be length), in any case maybe know the general order.
by Kendra Barreras 3E
Sun Oct 20, 2019 10:29 am
Forum: Photoelectric Effect
Topic: The Rydberg Formula and the Hydrogen Atomic Spectrum
Replies: 4
Views: 102

Re: The Rydberg Formula and the Hydrogen Atomic Spectrum

It can only work for Hydrogen, or other one electron systems because the Rydberg formula is used to predict the wavelength of light that results from a single electron moving between an atom's energy levels.
by Kendra Barreras 3E
Sun Oct 20, 2019 10:19 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Hund's rule and Pauli Exclusion Principle
Replies: 14
Views: 222

Re: Hund's rule and Pauli Exclusion Principle

Both are used together to find the correct ground state electron configuration. The Pauli Exclusion principle just tells you that in one individual level your electron direction has to be opposite of each other (have different spins). Hund's says you have to fill up every level before attempting to ...
by Kendra Barreras 3E
Sun Oct 20, 2019 10:13 am
Forum: *Shrodinger Equation
Topic: Shrodinger Equation
Replies: 3
Views: 53

Re: Shrodinger Equation

Dr. Lavelle said in lecture that it wasn't necessary to know how to derive it for this class.
by Kendra Barreras 3E
Sun Oct 20, 2019 10:11 am
Forum: Properties of Electrons
Topic: Energy increasing
Replies: 7
Views: 136

Re: Energy increasing

The principal quantum number, n, determines the energy level of the electron in an atom. There are n^2 orbitals for each energy level.
by Kendra Barreras 3E
Sun Oct 13, 2019 10:41 pm
Forum: Significant Figures
Topic: sig figs and periodic tables
Replies: 11
Views: 399

Re: sig figs and periodic tables

I dont think it should be as long as your final answer is not more sig figs than the least digit you used.
by Kendra Barreras 3E
Sun Oct 13, 2019 10:39 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 5095

Re: Test 1 [ENDORSED]

I was wondering the same thing, if I had to take a guess I would say sometime in your specific upcoming discussion days.
by Kendra Barreras 3E
Sun Oct 13, 2019 10:36 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 214
Views: 115110

Re: Advice from a Medical Student [ENDORSED]

Thank you so much for the advice!
by Kendra Barreras 3E
Sun Oct 13, 2019 10:35 pm
Forum: Properties of Electrons
Topic: Energy levels
Replies: 4
Views: 68

Re: Energy levels

For my understanding as well, there is an infinte number of energy levels but you must remember that they are always integers.
by Kendra Barreras 3E
Sun Oct 13, 2019 10:32 pm
Forum: Trends in The Periodic Table
Topic: Element Names
Replies: 8
Views: 608

Re: Element Names

There is a periodic table on Lavelle's website and also for future reference it is in black and white just like it was in the first test.
by Kendra Barreras 3E
Sun Oct 06, 2019 8:19 pm
Forum: SI Units, Unit Conversions
Topic: Sig figs
Replies: 5
Views: 77

Re: Sig figs

It basically is just telling you that there are 3 sig figs and given that that is your least number of sig figs in the problem, that amount would be the one you would use for your answer.
by Kendra Barreras 3E
Sun Oct 06, 2019 8:16 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Reactions
Replies: 25
Views: 650

Re: Balancing Reactions

It's important to balance chemical equations because aside from the Law of Conservation of Mass where matter can not be created nor destroyed, you need to have the correct molar ratio in order to be able to conduct any sort of stoichiometric problem.
by Kendra Barreras 3E
Sun Oct 06, 2019 8:14 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 198
Views: 139058

Re: Rusty on High School Chem [ENDORSED]

Personally Lavelle's modules help out a lot and also what has helped me with topics I struggle with is to google problems aside from the book and see if I find a way that makes more sense to me. Thanks to eeryone for the tips!
by Kendra Barreras 3E
Sun Oct 06, 2019 8:06 pm
Forum: Significant Figures
Topic: When do zeros count?
Replies: 5
Views: 82

Re: When do zeros count?

The zeroes before a non zero number never count (ie 0.0005 has 1 sigfig) The zeroes after a non zero count because they are telling you that you are sure of that digit until that last zero (ie 12.2300 has 6sf) because a sig fig is all the digits that you are sure of plus the one you are unsure of, t...
by Kendra Barreras 3E
Sun Oct 06, 2019 8:02 pm
Forum: Limiting Reactant Calculations
Topic: limiting reactant
Replies: 9
Views: 231

Re: limiting reactant

Not necessarily, you first would have to see which ratio you need using your balanced chemical equation and then convert the grams you were given into moles and see if it fits the ratio, you have. If it does not you have to check if it either has more or less than you need and evaluate from there.

Go to advanced search