Search found 25 matches

by melinak1
Thu Oct 31, 2019 2:09 pm
Forum: Lewis Structures
Topic: Question 2A9
Replies: 4
Views: 30

Re: Question 2A9

Yes, they do not notate 4s in the configuration because they took 2 electrons out, to give it a 2+ charge. As stated earlier, they took the electrons out of 4s because it is farther from the nucleus compared to 3d. So it would be harder to take 2 electrons from the d-block compared to the s-block. ...
by melinak1
Thu Oct 31, 2019 2:06 pm
Forum: Lewis Structures
Topic: valence electrons
Replies: 4
Views: 30

Re: valence electrons

group # of the element
by melinak1
Thu Oct 31, 2019 1:57 pm
Forum: Lewis Structures
Topic: 2B 19
Replies: 3
Views: 24

Re: 2B 19

Kristina Rizo 3K wrote:Doesn't the octet rule mean that there must be 8 valence electrons on each element?



yes but make sure you also take a look at the octet exceptions
by melinak1
Thu Oct 31, 2019 1:55 pm
Forum: Lewis Structures
Topic: octet exceptions
Replies: 5
Views: 29

Re: octet exceptions

Molecules that have exceptions to the octet rule are molecules with an odd number of electrons (ex. NO) , molecules in which an atom or more than one atom have more than 8 electrons (ex. SF6) , and molecules in which an atom or more than one atom have less than 8 electrons (ex. BCl3) . thank you!!!
by melinak1
Thu Oct 31, 2019 1:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm review sessions
Replies: 3
Views: 27

Re: Midterm review sessions

It says on Monday and Tuesday (Nov 4 and 5) that there are review sessions for bonding/structures. There are 4 of them just for bonding/structures so does that mean they are all going to be the same or are they going to go over different stuff/different examples? im sure itll be different examples,...
by melinak1
Thu Oct 31, 2019 1:52 pm
Forum: Administrative Questions and Class Announcements
Topic: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]
Replies: 52
Views: 3141

Re: DINO NUGGETS Review Session! Download Problems HERE [ENDORSED]

I have class until 5:50 on Friday. Is it still fine if I come to the review session 6-8? What will I miss?
by melinak1
Fri Oct 25, 2019 1:37 am
Forum: Trends in The Periodic Table
Topic: Question 1F.3
Replies: 5
Views: 40

Re: Question 1F.3

Yes, they have the same number of electrons; however, each ion's atomic number is different. This causes varying effective nuclear charges within each ion. For example, for the chlorine ion, the nuclear charge is greater compared to the phosphorus ion and sulfur ion. Despite having the same number ...
by melinak1
Fri Oct 25, 2019 1:35 am
Forum: Trends in The Periodic Table
Topic: Aufbau Principle
Replies: 11
Views: 73

Re: Aufbau Principle

What kind of questions might there be regarding the Aufbau Principle on a test? Questions regarding the electron configurations of elements. So you must be able to know the principles in order to determine the correct electron configurations or to figure out whether or not the electron is in a grou...
by melinak1
Fri Oct 25, 2019 1:34 am
Forum: Trends in The Periodic Table
Topic: week 4 Hw problems
Replies: 4
Views: 39

Re: week 4 Hw problems

Kristina Rizo 3K wrote:I just want to clarify that we can still turn in quantum world hw questions as the 5 questions due in section? I have them done and don't want to find out later that I won't get credit.


yes because we havent moved on to chemical bonds yet
by melinak1
Fri Oct 25, 2019 1:33 am
Forum: Trends in The Periodic Table
Topic: Relationship between Electronegativity and Ionization Energy?
Replies: 6
Views: 42

Re: Relationship between Electronegativity and Ionization Energy?

What is the relationship between electronegativity and ionization energy? I know Dr. Lavelle said that the atom with the lowest ionization energy is the central atom for a lewis structure, but in high school I learned that the central atom was the most electronegative atom. Is the atom with the low...
by melinak1
Fri Oct 18, 2019 1:24 am
Forum: Administrative Questions and Class Announcements
Topic: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE
Replies: 49
Views: 1451

Re: KAREN SUN 5-7PM WORKSHOP - DOWNLAOD WORKSHEETS HERE

Greetings Chem 14A students! My name is Karen Leung, one of your UAs this quarter. I will be hosting workshops every Sunday 5-7pm this quarter, and I use worksheets I have made to facilitate my workshops. They will be posted on this SAME post here every week (I'll try to have them posted by Friday ...
by melinak1
Fri Oct 18, 2019 1:20 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 1886

Re: Test 1 [ENDORSED]

Angela Prince 3B wrote:I can't find my test grades on ccle, where do I go?


go to the discussion section grades, they should be posted there
by melinak1
Fri Oct 18, 2019 1:20 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 1886

Re: Test 1 [ENDORSED]

we can still use a scientific calculator for the exam, right?
by melinak1
Fri Oct 18, 2019 1:18 am
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1066

Re: Week 2 Homework Problems [ENDORSED]

KTran 1I wrote:
Abraham De Luna wrote:He specified to do either fundamentals or quantum world for homework 2.

Would there be any benefit to do one or the other, such as if one would better prepare us for a test or quiz?


i think so, it couldnt hurt to practice since we dont know whhat the exam will be like
by melinak1
Fri Oct 18, 2019 1:17 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Plausibility
Replies: 29
Views: 549

Re: Wavelength Plausibility

Angela Prince 3B wrote:
APatel_4A wrote:He said that it is 720 to 400 but that we can just remember 700 to 400 since it's easier!


Because it differs so much according to different tables, I think it will be fine if you just remember 700 to 400



thank you!!
by melinak1
Fri Oct 11, 2019 4:32 pm
Forum: Significant Figures
Topic: Significant Figures
Replies: 10
Views: 121

Re: Significant Figures

JOtomo1F wrote:
melinak1 wrote:
505106414 wrote:


what are trailing zeros in the decimal portion?


Here is an example of trailing zeros " 175.00" and that number contains five significant figures.



thank you so much!!
by melinak1
Fri Oct 11, 2019 4:27 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty in Speed [ENDORSED]
Replies: 18
Views: 491

Re: Uncertainty in Speed [ENDORSED]

andrewcj 4I wrote:One additional thing for my reply, make sure you convert nm to m.


ohh ok thank you!
by melinak1
Fri Oct 11, 2019 4:25 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1066

Re: Week 2 Homework Problems [ENDORSED]

the homework due for this coming week is over quantum only, due during your discussion section
by melinak1
Fri Oct 11, 2019 4:19 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 70
Views: 975

Re: Rydberg equation [ENDORSED]

are the final units wirtten in Hz or Js?
by melinak1
Thu Oct 03, 2019 10:59 am
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula Purpose
Replies: 13
Views: 103

Re: Empirical Formula Purpose

melinak1 wrote:the molecular formula gives us a more accurate number of how many atoms we are working with, while the empirical formula provides a more vague idea, or ratio, or the atoms that we are working with

that being said, the empirical formula should always be SIMPLIFIED
by melinak1
Thu Oct 03, 2019 10:58 am
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula Purpose
Replies: 13
Views: 103

Re: Empirical Formula Purpose

the molecular formula gives us a more accurate number of how many atoms we are working with, while the empirical formula provides a more vague idea, or ratio, or the atoms that we are working with
by melinak1
Thu Oct 03, 2019 10:57 am
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 117
Views: 1711

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

Thank you so much for that Ashley! good luck on your journey
by melinak1
Thu Oct 03, 2019 10:55 am
Forum: Significant Figures
Topic: Significant Figures
Replies: 10
Views: 121

Re: Significant Figures

505106414 wrote:
JOtomo1F wrote:Here are a couple rules I found online:
Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal portion ONLY are significant.


what are trailing zeros in the decimal portion?
by melinak1
Thu Oct 03, 2019 10:52 am
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 116
Views: 10385

Re: All students read this sig fig post [ENDORSED]

is there a consistent rule of how many sig figs there should be? or does it depends on what the problem is asking for?

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