Search found 49 matches

by RichBollini3C
Sat Dec 07, 2019 9:40 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: H2O and Carbonate
Replies: 3
Views: 16

Re: H2O and Carbonate

1. Water can't act as a polydentate because it is too small to form multiple bonds to a transition metal central atom. The lone pairs are both on the same O atom. 2. Carbonate can act as both mono and bidentate. Since it has two O atoms with - charge (lone pairs), it can interact in two places. It ...
by RichBollini3C
Sat Dec 07, 2019 9:33 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to Electronegativity
Replies: 3
Views: 21

Re: Exceptions to Electronegativity

Alvaro Chumpitaz 4D wrote:Are there any exceptions to the electronegativity periodic trend?

none except the nobles gases.
by RichBollini3C
Sat Dec 07, 2019 5:45 pm
Forum: Trends in The Periodic Table
Topic: Midterm Review Problem 10 d
Replies: 5
Views: 35

Re: Midterm Review Problem 10 d

Oxygen is an exception to the trend because it is easier for oxygen to give up an electron to have a more stable configuration than it is for nitrogen to give up an electron. This is because nitrogen has three electrons in the p orbital, which is relatively more stable than the four electrons oxyge...
by RichBollini3C
Sat Dec 07, 2019 5:33 pm
Forum: Trends in The Periodic Table
Topic: Question
Replies: 17
Views: 82

Re: Question

Kavya Immadi 3D wrote:Ionization energy is the energy needed to remove electrons from atoms. Electronegativity is how much an atom attracts electrons.

very helpful
by RichBollini3C
Sat Dec 07, 2019 5:27 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity
Replies: 7
Views: 50

Re: Electronegativity

Will we have to know general electronegativity trends for this upcoming midterm? I haven't fully solidified my concept of it yet and was wondering how much of it will be necessary for the midterm. yes, however we will most likely just need to know that electronegativity increases as you move up and...
by RichBollini3C
Sat Dec 07, 2019 5:24 pm
Forum: Trends in The Periodic Table
Topic: Periodic Table trends
Replies: 11
Views: 71

Re: Periodic Table trends

The s-, p-, d-, and f- orbitals designate the shapes of the mathematical functions predicting the locations of electrons in atoms. The s- orbital has a spherical shape with no nodal planes and symmetric distribution, the p-orbital has two lobes on either side of the nucleus, d- orbital has three 4-...
by RichBollini3C
Sat Dec 07, 2019 5:19 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radii
Replies: 9
Views: 55

Re: Atomic Radii

Anokhi Patel 4G wrote:We can use atomic radii to determine the strength of the attraction of electrons to the atom compared how well the nucleus holds the electrons together.

Very helpful!
by RichBollini3C
Sat Dec 07, 2019 5:17 pm
Forum: Trends in The Periodic Table
Topic: Nitrogen
Replies: 3
Views: 26

Re: Nitrogen

Electron affinity is the likelihood of an atom gaining an electron. Since Nitrogen's 2p shell is has 3 up-spin electrons, making it half full, it would not want to take on another electron because it would make the atom less stable. Half full and completely full subshells are more stable than parti...
by RichBollini3C
Sat Dec 07, 2019 5:16 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to Electroaffinity
Replies: 3
Views: 25

Re: Exceptions to Electroaffinity

kendal mccarthy wrote:I think as long as you know the general trends of electronegativity that should suffice. If there are weird patterns that might not seem obvious my TA said the test would include numbers of electronegativity to help.

Thank you, very helpful!
by RichBollini3C
Sat Dec 07, 2019 5:15 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic
Replies: 3
Views: 19

Re: Isoelectronic

I don't think there can a trend on the periodic table for isoelectronegativity since it's comparing the amount of electrons for different molecules. O^2- is isoelectric with Neon because they both have 10 electrons. In terms of atomic size in an isoelectric series, the more protons there are the sm...
by RichBollini3C
Sat Dec 07, 2019 5:13 pm
Forum: Sigma & Pi Bonds
Topic: Characteristics
Replies: 2
Views: 21

Re: Characteristics

AngieGarcia_4F wrote:I think you could relate it to chelating ligands because a ligand cant create a ring around a metal if it cant rotate meaning it would have to have the right type of bond (single vs double) in the right places.

Thank you, this was helpful
by RichBollini3C
Sat Dec 07, 2019 5:11 pm
Forum: Sigma & Pi Bonds
Topic: Ionic bond --> sigma and pi bonds
Replies: 8
Views: 36

Re: Ionic bond --> sigma and pi bonds

Chloe Alviz 3F wrote:In the textbook, it says that all single covalent bonds are sigma bonds. If this is the case, how would we define the bond for an ionic compound such as NaCl?

It would just be defined as an ionic bond.
by RichBollini3C
Sat Dec 07, 2019 4:39 pm
Forum: Sigma & Pi Bonds
Topic: pi bonds
Replies: 5
Views: 18

Re: pi bonds

905174774 wrote:FOr pi bonds, a triple bond is considered one sigma bond and two pi bonds right?

yes!
by RichBollini3C
Sat Dec 07, 2019 4:29 pm
Forum: Naming
Topic: writing formula of a given name
Replies: 5
Views: 42

Re: writing formula of a given name

Jessica Tejero 3L wrote:Write the names of the ligands in the following order: neutral, negative, positive. If there are multiple ligands of the same charge type, they are named in alphabetical order.

Awesome, thank you
by RichBollini3C
Mon Nov 18, 2019 4:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test
Replies: 2
Views: 25

Re: Test

Haley Dveirin 4B wrote:I would just to be safe. I think you should know all the VSEPR shapes listed on the worksheet handed out in your discussion section which includes those.

Is there anywhere we can find a copy of that sheet online?
by RichBollini3C
Mon Nov 18, 2019 3:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Pi Bond vs Sigma
Replies: 6
Views: 26

Re: Pi Bond vs Sigma

Sara Richmond 1D wrote:Sigma bonds are single bonds. Pie bonds are in double and triple bonded atoms. In a double/ triple bonded atom, one bond is always a sigma bond and the others are pie bonds.

Thank you!
by RichBollini3C
Mon Nov 18, 2019 3:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 6
Views: 29

Re: Shapes

Linear 180 Trigonal Planar 120 Bent (varies based on which formula it is, if its AX2E2 then its less than 109.5, if its AX2E then its less than 120) Tetrahedral 109.5 Trigonal Pyramidal less than 109.5 Trigonal Bipyramidal 90 and 120 See Saw less than 90 & less than 120 T-shaped less than 90 &a...
by RichBollini3C
Mon Nov 18, 2019 3:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shapes
Replies: 6
Views: 29

Re: Shapes

It's hard to say which ones will be on the test and the exam, but I'd say definitely any shape that Lavelle has shown us in lecture as well as any that appear in the homework. But everything on the chart below would be a good thing to memorize, just to be safe. https://www.google.com/url?sa=i&s...
by RichBollini3C
Mon Nov 18, 2019 3:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Pi Bond vs Sigma
Replies: 6
Views: 26

Re: Pi Bond vs Sigma

How can we tell when a bond is a Pi or Sigma bond?
by RichBollini3C
Mon Nov 18, 2019 3:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER
Replies: 7
Views: 42

Re: VSPER

Do we need to know this for Test 2?
by RichBollini3C
Mon Nov 18, 2019 3:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: wedge and dash
Replies: 2
Views: 19

Re: wedge and dash

lauraxie3d wrote:When do I use wedge and dash to draw models? For example CH4 in class we drew it using wedge and dash, but SF6 we didn't?


The wedge and dash are used to show the VSEPR 3D structures of molecules/molecular geometry.
by RichBollini3C
Mon Nov 18, 2019 3:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Notation
Replies: 7
Views: 36

Re: VSEPR Notation

NicoJones_1B wrote:If our molecule does not have any lone pairs when writing the notation do we write E0 or just not write E at all?

i don't believe you need to include E0
by RichBollini3C
Mon Nov 18, 2019 3:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR, Molecular Geometry, and Molecular Shape
Replies: 4
Views: 24

Re: VSEPR, Molecular Geometry, and Molecular Shape

The VSEPR model gives you the electron geometry and molecular shape. The electron geometry of a molecule is the naming convention based on the number of electron regions. Molecules with 2 electron regions are linear, 3 electron regions are trigonal planar, 4 electron regions are tetrahedral, 5 elec...
by RichBollini3C
Mon Nov 18, 2019 2:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bonds in VSEPR
Replies: 11
Views: 45

Re: Bonds in VSEPR

In VSEPR, double and triple bonds would still be represented as “single” bonds demonstrably. Lavelle even said that we should think of these spaces as possible spots of electron density where said density of electrons is highest. This is for VSPER models specifically. thank you, this was very helpful
by RichBollini3C
Mon Nov 18, 2019 2:52 pm
Forum: Hybridization
Topic: Test 2
Replies: 11
Views: 60

Re: Test 2

Alexis 3F wrote:This test will only range from what we've learned since the midterm up until the first 5 minutes of class on monday

Do you know what sections in the book that covers?
by RichBollini3C
Mon Oct 28, 2019 2:35 pm
Forum: Sigma & Pi Bonds
Topic: Difference between Sigma & Pi
Replies: 5
Views: 55

Re: Difference between Sigma & Pi

Both sigma and pi bonds are covalent bonds and form by overlap of atomic orbitals. Sigma bonds are formed by end-to-end overlapping and Pi bonds are when the lobe of one atomic orbital overlaps another. Generally sigma bonds are stronger than pi bonds. They can occur in the same molecule. Thank you...
by RichBollini3C
Mon Oct 28, 2019 2:28 pm
Forum: Sigma & Pi Bonds
Topic: Triple bond?
Replies: 18
Views: 481

Re: Triple bond?

Sana_Mian_3G wrote:If there is a triple bond how many pi and sigma bonds are there?

1 sigma and 2 pi bonds
by RichBollini3C
Mon Oct 28, 2019 2:00 pm
Forum: Sigma & Pi Bonds
Topic: Significance of Sigma and Pi Bonds
Replies: 3
Views: 33

Re: Significance of Sigma and Pi Bonds

For a more in-depth analysis of your question, I would take a look at this article: https://brilliant.org/wiki/sigma-and-pi-bonds/ Understanding the difference between sigma and pi bonds is important in understanding the molecular orbital theory, which will in turn help you with structural and orbi...
by RichBollini3C
Mon Oct 28, 2019 1:57 pm
Forum: Sigma & Pi Bonds
Topic: Single vs. Double bonds
Replies: 15
Views: 77

Re: Single vs. Double bonds

VLi_1L wrote:Why are single bonds longer than double bonds?

The attraction is stronger in the double bond, since there are more electrons, which pulls the atoms closer together, causing the bond length to be shorter than a single bond.
by RichBollini3C
Mon Oct 28, 2019 1:54 pm
Forum: Ionic & Covalent Bonds
Topic: periodic table
Replies: 10
Views: 71

Re: periodic table

Kennedi3K wrote:Is this the same for ionization energy?

Yes!
by RichBollini3C
Mon Oct 28, 2019 1:53 pm
Forum: Ionic & Covalent Bonds
Topic: periodic table
Replies: 10
Views: 71

Re: periodic table

Kendra Barreras 3E wrote: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.

Thank you!
by RichBollini3C
Mon Oct 28, 2019 1:04 am
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 132
Views: 75869

Re: Reading the textbook [ENDORSED]

Jaklin Astvatsatryan wrote:guys i really recommend watching videos, esp my visual learners. start problems and try doing them without notes and then watch videos if you're really stuck.

this really helped me, thank you!
by RichBollini3C
Mon Oct 28, 2019 1:03 am
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 132
Views: 75869

Re: Reading the textbook [ENDORSED]

I know that in the course reader it says to read chapter 5 for a review for gases. But every time i try reading the textbook i get intimidated and i stop reading the textbook . Do you guys find it more helpful when you guys read the textbook? Yes, although I would agree sometimes it is confusing, i...
by RichBollini3C
Mon Oct 28, 2019 12:57 am
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 20
Views: 617

Re: Accessing the E-textbook [ENDORSED]

I noticed there are some differences between edition 6 and edition 7 of the book, the first parts were similar but now it is become more and more different, can edition 6 still work?
by RichBollini3C
Mon Oct 28, 2019 12:44 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Problem 4A.9) 7th edition of the textbook [ENDORSED]
Replies: 7
Views: 26803

Re: Problem 4A.9) 7th edition of the textbook [ENDORSED]

Does anyone know what sections we can turn in for homework number 5?
by RichBollini3C
Fri Oct 18, 2019 12:35 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 90
Views: 19199

Re: Final Jitters

Thank you all, this all really helped.
by RichBollini3C
Thu Oct 17, 2019 1:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework Problem Help
Replies: 5
Views: 42

Re: Homework Problem Help

Does anyone know what section problems we should be turning in for homework #4? Is it still quantum?
by RichBollini3C
Thu Oct 17, 2019 1:29 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 48
Views: 37239

Re: How to find my posts

Gilberto Millan 1F wrote:
RichBollini3C wrote:Does anyone know how to see how many posts you have posted?

Yes, you go to the top right and click on your username->click on control panel->click on overview->go to the bottom of the page and it should say something like "My Posts."


Thank you so much, this worked!
by RichBollini3C
Thu Oct 17, 2019 1:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1441

Re: Week 2 Homework Problems [ENDORSED]

Lizette Noriega 1H wrote:
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?


I believe it varies because I know some TAs that are grading based on solely completion.
by RichBollini3C
Thu Oct 10, 2019 8:39 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 1310

Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]

ktran Disc 1I wrote:Is it recommended to just show all of our work when possible? Also, do we need to include the specifications for the element/compound in our calculations?

I think the safe bet is to always show every step with the specifications for an element or compound just in case.
by RichBollini3C
Thu Oct 10, 2019 8:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1441

Re: Week 2 Homework Problems [ENDORSED]

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.
by RichBollini3C
Thu Oct 10, 2019 8:20 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1441

Re: Week 2 Homework Problems [ENDORSED]

Angela Prince 3B wrote:Does anyone know if we will be on the quantum topic for more than just one week? I just want to know if the homework set for quantum will be used for both weeks 3 and 4. Thanks!

I think since we are learning about quantum topics for a couple of weeks it should be used for both week 3 and 4.
by RichBollini3C
Thu Oct 10, 2019 8:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1441

Re: Week 2 Homework Problems [ENDORSED]

Maya Beal Dis 1E wrote:Since the Quantum Unit is more than a week long does it mean we just hand in five homework problems from that section every week until we are done with the unit?

I also was confused about this, will he tell us what sections we should be doing each week?
by RichBollini3C
Thu Oct 10, 2019 8:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1441

Re: Week 2 Homework Problems [ENDORSED]

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? Doing the fundamentals problems for homework 2 would probably be the best preparation for the test since quantum is n...
by RichBollini3C
Thu Oct 03, 2019 2:49 pm
Forum: Administrative Questions and Class Announcements
Topic: How to list Chem_Mod posts
Replies: 11
Views: 32225

Re: How to list Chem_Mod posts

Thank you so much. Life saver.
by RichBollini3C
Thu Oct 03, 2019 2:44 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 149
Views: 84696

Re: Advice from a Medical Student [ENDORSED]

Thank you so much for your advice! This is going to help me a lot this year!
by RichBollini3C
Thu Oct 03, 2019 2:41 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 48
Views: 37239

Re: How to find my posts

Does anyone know how to see how many posts you have posted?
by RichBollini3C
Thu Oct 03, 2019 2:35 pm
Forum: Administrative Questions and Class Announcements
Topic: First Test in Discussion
Replies: 13
Views: 168

Re: First Test in Discussion

I think we need to bring a non-graphing calculator, i'm not sure if we are going to be given a periodic table or not though.
by RichBollini3C
Thu Oct 03, 2019 2:24 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student - Part II [ENDORSED]
Replies: 128
Views: 2291

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

Thank you so much for sharing your story! It is super interesting to hear first hand what your experience was like!

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