Search found 32 matches

by Lizette Noriega 1H
Thu Nov 07, 2019 10:10 pm
Forum: Bond Lengths & Energies
Topic: Week 7 Homework
Replies: 15
Views: 115

Week 7 Homework

For next week's homework are we turning in questions from the Chemical Bonds section or do we move onto Molecular Shape and Structure?
by Lizette Noriega 1H
Thu Nov 07, 2019 1:21 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Shortcut for Formal Charge
Replies: 8
Views: 36

Re: Shortcut for Formal Charge

(# of valence electrons) - (# of electrons + # of bonds) = formal charge

or if you want an even simpler way of thinking about it: (# of valence electrons) - (# of dots + # of lines)
by Lizette Noriega 1H
Thu Nov 07, 2019 1:18 pm
Forum: Lewis Structures
Topic: When to draw Resonance Structures
Replies: 14
Views: 61

Re: When to draw Resonance Structures

It's best to always draw resonance structures if the molecule has them. It demonstrates your understanding and it's just safe to have even if you aren't being directly asked to provide them
by Lizette Noriega 1H
Thu Nov 07, 2019 1:17 pm
Forum: Ionic & Covalent Bonds
Topic: Solubility
Replies: 3
Views: 17

Solubility

How do solubility and ionic/covalent character relate to one another? Is ionic character more soluble and covalent character less soluble?
by Lizette Noriega 1H
Thu Nov 07, 2019 1:14 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 14
Views: 121

Re: Class Grading

Yes, that's correct. The grades will be dependent on the number of points and the cutoffs made by Dr.Lavelle with regards to the class average
by Lizette Noriega 1H
Thu Nov 07, 2019 1:10 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths in resonance structures
Replies: 2
Views: 9

Re: Bond lengths in resonance structures

The bond lengths in resonance structures will be an average of all the present bonds; this is due to the creation of a resonance hybrid which creates another molecular structure from all the other existing resonance structures
by Lizette Noriega 1H
Thu Oct 31, 2019 11:39 am
Forum: Administrative Questions and Class Announcements
Topic: Study Tips!
Replies: 7
Views: 31

Re: Study Tips!

Watching YouTube videos and taking notes on them has been very resourceful for me. It helps me gain a better understanding of the concepts for equations and the main topics of our classes.
by Lizette Noriega 1H
Thu Oct 31, 2019 11:33 am
Forum: Photoelectric Effect
Topic: Threshold Energy
Replies: 5
Views: 47

Threshold Energy

Hello, I just need clarification on threshold energy. I know the threshold energy is the energy needed in order to eject electrons from a metal surface but in terms of the equation, is it represented by the work function? Thanks!
by Lizette Noriega 1H
Thu Oct 31, 2019 11:24 am
Forum: DeBroglie Equation
Topic: Confused about equations
Replies: 7
Views: 50

Confused about equations

Hello,

This is a dumb question but I need clarification as to when you use certain equations since I always seem to mix them up. For instance, what kinds of problems indicate the use of the de Broglie equation (λ = h/mv) in contrast to the equations for wavelength (c= λv) and energy (E=hv)?

Thanks!
by Lizette Noriega 1H
Thu Oct 31, 2019 11:14 am
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 44
Views: 313

Re: Study Tips

Personally I have found YouTube to be very resourceful because the videos provide extra material in addition to lectures which helps me understand the concepts better and relate them to the practice problems we go over. I would also suggest taking notes while you're watching the video because it's h...
by Lizette Noriega 1H
Thu Oct 31, 2019 11:06 am
Forum: Molarity, Solutions, Dilutions
Topic: Practice Question for Midterm
Replies: 2
Views: 50

Re: Practice Question for Midterm

Thank you so much!! That makes more sense. The equation editor is really useful in making sense of the math so thanks for that as well.
by Lizette Noriega 1H
Wed Oct 30, 2019 1:58 pm
Forum: Molarity, Solutions, Dilutions
Topic: Practice Question for Midterm
Replies: 2
Views: 50

Practice Question for Midterm

Hello, could someone explain how to solve for this question? Thanks! "Potassium permanganate, KMnO4, is an inorganic chemical compound used for cleaning wounds. 5.00 g of KMnO4 is dissolved in a 150.00 mL flask of water. If 20.00 mL of this solution is removed and placed in a new 2nd 250.00 mL ...
by Lizette Noriega 1H
Thu Oct 24, 2019 5:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble Gas Configuration
Replies: 10
Views: 57

Re: Noble Gas Configuration

There's no specific rule as to when you must use the noble gas configuration over the complete electron configuration. My TA said it is much simpler to use the noble gas configuration but to be careful on exams when you are asked to provide the entire electron configuration of an element
by Lizette Noriega 1H
Thu Oct 24, 2019 5:18 pm
Forum: Trends in The Periodic Table
Topic: Periodic Trend Exceptions
Replies: 7
Views: 51

Re: Periodic Trend Exceptions

I know there is a trend for valence electrons which is to look at the column number to determine the number of valence electrons found in a certain element. Although, this only applies to the s and p blocks.
by Lizette Noriega 1H
Thu Oct 24, 2019 5:03 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 68
Views: 947

Re: Rydberg equation [ENDORSED]

In what kinds of scenarios or questions would we need to use the Rydberg equation?
by Lizette Noriega 1H
Thu Oct 24, 2019 12:41 pm
Forum: Ionic & Covalent Bonds
Topic: Cation
Replies: 23
Views: 113

Re: Cation

Cations are atoms with a positive charge (+) while anions are atoms with a negative charge (-); this is due to the loss or gain of electrons. They are important because they are essential to the formation of ionic bonds, bonds in which electrons are lost or gained in order to reach a more stable sta...
by Lizette Noriega 1H
Thu Oct 24, 2019 11:00 am
Forum: Properties of Light
Topic: Midterm
Replies: 4
Views: 37

Re: Midterm

He did mention that he will have multiple review sessions (spread out through his lectures I believe?) but primarily, he mentioned having a large review session on the Saturday or Sunday before the midterm- his only concern is obtaining a large lecture room so that many people can attend. He also me...
by Lizette Noriega 1H
Wed Oct 16, 2019 4:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Tutoring? [ENDORSED]
Replies: 61
Views: 53647

Re: Tutoring? [ENDORSED]

I would definitely recommend signing up for AAP's peer learning sessions as well as joining study groups with other classmates. There are many resources out there in addition to tutors. Peer learning sessions offer many study sessions so they are flexible with your schedules- they also do midterm an...
by Lizette Noriega 1H
Wed Oct 16, 2019 4:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Difference Between Ground and Excited States
Replies: 3
Views: 15

Re: Difference Between Ground and Excited States

An electron is at its excited state whenever its energy level is higher than its corresponding ground state. During ground state, its electron configuration is at default whereas, during the excited state, it will jump into a high orbital
by Lizette Noriega 1H
Wed Oct 16, 2019 4:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1053

Re: Week 2 Homework Problems [ENDORSED]

RichBollini3C wrote:
Diana Chavez-Carrillo 3J wrote:Are the TA's grading our homework based on completion or correctness?

I believe they are grading based on correctness.


Do you know if all the TAs grade based on correctness or does it vary from TA to TA?
by Lizette Noriega 1H
Wed Oct 16, 2019 4:13 pm
Forum: *Shrodinger Equation
Topic: Equations for Quantum Topics
Replies: 3
Views: 16

Equations for Quantum Topics

Hello, I'm just looking for clarification on the equations that are currently being used in the material we are studying right now. So far, Lavelle has gone over three main equations: the de Broglie equation, Schrodinger's equation, and Heisenberg's indeterminacy equation. Are there any more essenti...
by Lizette Noriega 1H
Wed Oct 16, 2019 4:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What are subshells
Replies: 4
Views: 39

Re: What are subshells

The letter, s, p, d, and f, refer to subshells which are orbitals that correspond to already existing orbitals. Each of the subshells has its own orbitals as well. For example, the s subshell has 1, the p subshell has 3, and so forth.
by Lizette Noriega 1H
Fri Oct 11, 2019 11:28 am
Forum: Student Social/Study Group
Topic: Peer Learning Sessions
Replies: 3
Views: 16

Re: Peer Learning Sessions

Anyone enrolled in the course can attend- you just show up to the session!
by Lizette Noriega 1H
Fri Oct 11, 2019 11:26 am
Forum: Student Social/Study Group
Topic: Weekly Posts
Replies: 6
Views: 36

Weekly Posts

Hello- are our five weekly posts due by Friday or Sunday? I know we have to post five comments by the end of the week but I was wondering if there was a definite deadline. Thanks!
by Lizette Noriega 1H
Fri Oct 11, 2019 11:11 am
Forum: Administrative Questions and Class Announcements
Topic: Weekly Posts
Replies: 4
Views: 45

Re: Weekly Posts

I don't believe any comments from the previous week carries onto the next- this is to encourage students to interact weekly. I would suggest making five posts per week just to be safe.
by Lizette Noriega 1H
Fri Oct 11, 2019 11:08 am
Forum: Administrative Questions and Class Announcements
Topic: Posting
Replies: 3
Views: 23

Re: Posting

You can go to the board index and scroll down until you find the forums. From there, you open the forum that corresponding to the topic of your choosing. After you've opened it, you can click on "New Topic" in order to make a post. Hope this helps!
by Lizette Noriega 1H
Fri Oct 11, 2019 11:00 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Theoretical vs. Actual Yield
Replies: 38
Views: 268

Re: Theoretical vs. Actual Yield

Like any experiment, there are always side reactions that can occur such as loss of heat, impurities (product sticks to the side of the beaker), or human error (incorrect measurements of reactants). Taking these things into account, the actual yield is going to be less than the theoretical yield bec...
by Lizette Noriega 1H
Thu Oct 03, 2019 3:38 pm
Forum: Empirical & Molecular Formulas
Topic: Test Materials
Replies: 13
Views: 91

Re: Test Materials

We will be given the periodic table along with the essential formulas. Although, memorizing Avagadro's constant can be beneficial just in case. Also, just a reminder that all exams will require you to write in pen only so make sure to bring that as well.
by Lizette Noriega 1H
Thu Oct 03, 2019 3:32 pm
Forum: General Science Questions
Topic: Order of Elements When Writing Out a Compound
Replies: 8
Views: 96

Re: Order of Elements When Writing Out a Compound

According to the TAs, this information will be given to us. The only situation in which we'll have to write out the compounds will be for questions that include combustion/oxidation/metabolism.
by Lizette Noriega 1H
Thu Oct 03, 2019 3:26 pm
Forum: SI Units, Unit Conversions
Topic: Clarification for SI Units
Replies: 4
Views: 45

Clarification for SI Units

Hello, I just want some clarification on SI units and I want to make sure that I've written the correct prefixes for each conversion. Also, is it required to know all of them? In which cases would it be necessary to use such unit conversions? Thanks! G - giga 10^9 M - mega 10^6 k - kilo 10^3 d - dec...
by Lizette Noriega 1H
Thu Oct 03, 2019 3:11 pm
Forum: SI Units, Unit Conversions
Topic: Question about Showing Work
Replies: 22
Views: 144

Re: Question about Showing Work

I would suggest always showing your work and including units as much as possible. Providing your work demonstrates how thoroughly you know the material and in some cases, could earn you partial credit when you have an incorrect answer.
by Lizette Noriega 1H
Thu Oct 03, 2019 2:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 117
Views: 1683

Re: Advice from a Medical Student - Part II [ENDORSED]

Ashley, thank you for much for sharing your experience and opinions with us! I found it really interesting to hear about what happens within medical school and the events that you have come across in your first two years thus far. I really appreciate all the points you made, especially when talking ...

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