Search found 32 matches

by erica thompson 4I
Sun Nov 10, 2019 1:47 pm
Forum: Bond Lengths & Energies
Topic: how to determine the energy of a bond
Replies: 6
Views: 26

Re: how to determine the energy of a bond

The formal energy is the difference between the number of valence electrons an atom normally has, and how many it has in a particular molecule. You can just count each dot individually, and then count only one electron for each bond (line).
by erica thompson 4I
Fri Nov 08, 2019 11:57 pm
Forum: Resonance Structures
Topic: resonance hybrid
Replies: 6
Views: 23

Re: resonance hybrid

I think we have to know how to draw and name the different orbitals in the same layout as the "building up" method.
by erica thompson 4I
Fri Nov 08, 2019 11:56 pm
Forum: Resonance Structures
Topic: resonance importance?
Replies: 7
Views: 30

Re: resonance importance?

It's also important to know that electrons don't "jump" from one resonance structure to the other, but rather the different resonance structures show the different placements of electrons as they constantly move about.
by erica thompson 4I
Mon Nov 04, 2019 9:28 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversion
Replies: 2
Views: 24

Unit Conversion

Does anyone know if we have to include the nano/giga/mega/etc. prefixes in our answers? Or can we just use the basic unit and multiply it by 10^n in our final answer?
by erica thompson 4I
Sun Nov 03, 2019 7:53 pm
Forum: Ionic & Covalent Bonds
Topic: Carbon Bonding
Replies: 5
Views: 27

Carbon Bonding

Does carbon prefer to gain or lose 4 electrons in order to form a full shell? Or is it equally as favorable?
by erica thompson 4I
Sun Nov 03, 2019 7:40 pm
Forum: Ionic & Covalent Bonds
Topic: In what order do electrons get removed?
Replies: 7
Views: 7132

Re: In what order do electrons get removed?

How about when it comes to f-orbitals? Problem 2A.5 b) is making me think that having both a half-full/full d-subshell and a full s-subshell is more important than a full f-subshell.

So then is the order of removal for the electrons in the lower periods: p<f<s<d ??
by erica thompson 4I
Thu Oct 31, 2019 12:45 am
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons?
Replies: 15
Views: 80

Re: Valence Electrons?

Count from the last full period on the periodic table, representing a full electron shell, and that's how many valence electrons there are!
by erica thompson 4I
Thu Oct 31, 2019 12:41 am
Forum: Ionic & Covalent Bonds
Topic: Polarity
Replies: 6
Views: 24

Re: Polarity

Depends on the specific molecule and how much "pull" each element has in it.
by erica thompson 4I
Thu Oct 31, 2019 12:38 am
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 10
Views: 72

Re: Midterm

And bring a pen and a basic calculator! Professor Lavelle said that anything "over $10" is probably not allowed.
by erica thompson 4I
Thu Oct 31, 2019 12:29 am
Forum: Ionic & Covalent Bonds
Topic: Homework for Week 5
Replies: 8
Views: 36

Re: Homework for Week 5

It might be useful to do the most up-to-date problems if you're all caught up on the lectures, but I always just do whatever sections I need to focus more on! Just make sure to pace yourself and actually cover every topic :)
by erica thompson 4I
Thu Oct 31, 2019 12:24 am
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds
Replies: 6
Views: 24

Re: Ionic and Covalent Bonds

A coordinate covalent bond is a covalent bond in which one atom provides both electrons in a pair to another atom.
by erica thompson 4I
Wed Oct 23, 2019 10:02 pm
Forum: Trends in The Periodic Table
Topic: Location of elements
Replies: 12
Views: 66

Re: Location of elements

It would be helpful! In general, metals are the majority of the table on the left side, nonmetals are the upper-right corner, and metalloids sort of form a staircase in between metals and nonmetals.
by erica thompson 4I
Wed Oct 23, 2019 10:00 pm
Forum: Trends in The Periodic Table
Topic: Shielding
Replies: 7
Views: 31

Re: Shielding

Everyone above explained the concept that electrons closer to the nucleus have a stronger pull towards it than the further valence electrons nicely. The important thing to take away is that electrons in further shells are more easy to form bonds with other atoms because there's less pull!
by erica thompson 4I
Wed Oct 23, 2019 9:58 pm
Forum: Trends in The Periodic Table
Topic: bond length
Replies: 9
Views: 49

Re: bond length

I'm not sure I think he said that that's assessed in a formal lab setting? I think talking about the specifics of bond length was more to emphasize that electrons are not bouncing between elements, forming only a few specific double bonds. Electrons are always moving! Can someone elaborate on this? ...
by erica thompson 4I
Wed Oct 23, 2019 9:56 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity
Replies: 5
Views: 22

Re: Electron affinity

Elements on both sides of the periodic table are essentially trying to get "closer to" a noble gas in terms of stability in its electrons. Because elements on the left side want to lose electrons in order to be more stable, they would have less of an affinity, or attraction to, other elect...
by erica thompson 4I
Wed Oct 23, 2019 9:54 pm
Forum: Trends in The Periodic Table
Topic: Exceptions
Replies: 3
Views: 22

Re: Exceptions

It's also interesting to note that elements with low ionization energies typically form cations, which are typically metals. Because metals are grouped on the left side of the periodic table, you can use this as a memory clue to remind you that the ionization energy increases as you move across a pe...
by erica thompson 4I
Sun Oct 20, 2019 5:55 pm
Forum: Properties of Electrons
Topic: 1B. 15C [ENDORSED]
Replies: 4
Views: 56

Re: 1B. 15C [ENDORSED]

To respond to DHavo^^, I thought that you could use the two equations in similar ways because you can isolate and substitute v in both?
by erica thompson 4I
Sun Oct 20, 2019 5:50 pm
Forum: Properties of Electrons
Topic: Energy increasing
Replies: 7
Views: 44

Re: Energy increasing

I thought that the energy levels decreased as you moved further away from the nucleus because there was less electrostatic attraction?
by erica thompson 4I
Sun Oct 20, 2019 5:46 pm
Forum: Properties of Electrons
Topic: Electron structures
Replies: 4
Views: 22

Re: Electron structures

Each orbital can hold a maximum of 2 electrons, and the two electrons in the same orbital have opposite spins.
by erica thompson 4I
Sun Oct 20, 2019 5:44 pm
Forum: Properties of Electrons
Topic: d vs s orbitals
Replies: 6
Views: 39

Re: d vs s orbitals

The reasoning behind the order is that you're supposed to write it in order of lowest energy to highest energy. Because shells that are further away from the nucleus have less electrostatic attraction, further shells have less energy (double-check me on this?).
by erica thompson 4I
Sun Oct 20, 2019 5:41 pm
Forum: Properties of Electrons
Topic: Quantum numbers
Replies: 4
Views: 33

Re: Quantum numbers

To add onto Cassidy's comment above, it's important to know that although each orbital can hold a maximum of 2 electrons, each energy shell can have more than 2 (aside from s) because there are multiple orbitals in each shell.
by erica thompson 4I
Sun Oct 13, 2019 3:12 pm
Forum: Properties of Electrons
Topic: Electron Energy Levels
Replies: 8
Views: 37

Re: Electron Energy Levels

Does the number of energy levels not depend on the number of electrons the atom has? Or was that a simpler way of thinking about it in high school?
by erica thompson 4I
Fri Oct 11, 2019 1:51 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 61
Views: 18348

Re: Final Jitters

Definitely get a lot of sleep! If you are staying up late studying, you are losing sleep and are most likely not really taking in all the information in the later hours anyways. Also remember to sit back and take a deep breath any time you're feeling overwhelmed. Also, most importantly, put it all i...
by erica thompson 4I
Fri Oct 11, 2019 1:46 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Photoelectric Effect
Replies: 4
Views: 47

Re: Photoelectric Effect

In response to Brooke above, I think he clarified that it's more about the frequency than the amplitude, as you have to think of each atom separately (like the water flowing example).
by erica thompson 4I
Fri Oct 11, 2019 1:45 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 67
Views: 845

Re: Rydberg equation [ENDORSED]

Can someone clarify why the Rydberg equation is always negative? Because you're "losing" energy because it's being transferred somewhere else?
by erica thompson 4I
Fri Oct 11, 2019 1:42 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 139
Views: 83797

Re: Advice from a Medical Student [ENDORSED]

Thank you for the advice Ashley! How much do you think you specifically reference this information from this class in your work today, and as a medical student?
by erica thompson 4I
Fri Oct 11, 2019 1:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 959

Re: Week 2 Homework Problems [ENDORSED]

You can do problems from the Review sections, as that is the majority of the content for this week's Test.
by erica thompson 4I
Thu Oct 03, 2019 12:04 am
Forum: Molarity, Solutions, Dilutions
Topic: Empirical and Molecular Formulas
Replies: 13
Views: 92

Re: Empirical and Molecular Formulas

In the simplest terms, the empirical formula is the relative number of atoms, while the molecular formula is the actual number of atoms.
by erica thompson 4I
Thu Oct 03, 2019 12:01 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Units in Answer
Replies: 18
Views: 110

Re: Units in Answer

Like what many people said above, it depends what the problem is asking for. If the problem was asking you to solve for the mass, the answer would be in grams. I believe in lecture today he said that the SI fundamental units were:

- mass = kilograms
- length = meters
- time = seconds
by erica thompson 4I
Wed Oct 02, 2019 11:58 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 371

Re: Balancing Equations [ENDORSED]

That was definitely a technique he used for that specific problem! Working with stoichiometry problems will never have the same set of moves for each problem. In this case, we had a coefficient with a denominator of 2, so we had to multiply the entire problem by 2 in order to get rid of the fraction...
by erica thompson 4I
Wed Oct 02, 2019 11:55 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E1
Replies: 6
Views: 749

Re: E1

Responding to Brenna: The question is essentially telling us that we're lining up Ag atoms in a single-file line. You don't have to "convert" the problem to atoms because it is telling you that the unit we're working with is atoms right from the start.
by erica thompson 4I
Wed Oct 02, 2019 11:47 pm
Forum: SI Units, Unit Conversions
Topic: Can someone tell me where I can access the Solutions Manual?
Replies: 6
Views: 78

Re: Can someone tell me where I can access the Solutions Manual?

As someone mentioned above, the textbook offers solutions to both the self-tests in the readings and the odd-numbered exercise problems. According to the table of contents, both of them should be in the section at the end of the book with page numbers starting with "C."

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