Search found 54 matches

by BaileyB1F
Fri Dec 11, 2020 8:21 pm
Forum: Coordinate Covalent Bonds
Topic: Definition
Replies: 4
Views: 36

Re: Definition

I found this definition online "Ligands are ions or neutral molecules that bond to a central metal atom or ion. Ligands act as Lewis bases (electron pair donors), and the central atom acts as a Lewis acid (electron pair acceptor). Ligands have at least one donor atom with an electron pair used ...
by BaileyB1F
Fri Dec 11, 2020 7:45 pm
Forum: Identifying Acidic & Basic Salts
Topic: Conjugate Acids and Bases
Replies: 1
Views: 8

Re: Conjugate Acids and Bases

I hope I am answering the question correctly, but I thought an example would help. The conjugate acid is formed when a proton is added to a base. The conjugate base is formed when a proton is removed from an acid. So, NH3 + H20 --><-- NH4+ + HO- is the example. NH3 is the base, and any acid in water...
by BaileyB1F
Fri Dec 11, 2020 7:33 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Example Problem
Replies: 2
Views: 23

Example Problem

4. A sodium hydroxide solution has [HO-] = 3.50 x 10-3 M. What is its pH?
I'm still a bit confused on solving for pH and I was wondering if someone could walk through and explain the steps of this example. Thank you in advance.
by BaileyB1F
Fri Dec 11, 2020 6:56 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compounds
Replies: 3
Views: 41

Re: Amphoteric Compounds

H2O and NH3 are amphoteric and are not metalloids.
by BaileyB1F
Fri Dec 11, 2020 6:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Location of nodes on a plane for D orbitals
Replies: 2
Views: 55

Re: Location of nodes on a plane for D orbitals

I'm not sure if this is correct or fully answers your question, but I found this online. "The d orbitals can point their lobes between the axes: the dxy has lobes in the xy plane but between the x and y axes; the dyz is in the yz plane with lobes between the y and z axes; the dxz is in the xz p...
by BaileyB1F
Fri Dec 04, 2020 11:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Textbook Problem 9C.5
Replies: 1
Views: 30

Re: Textbook Problem 9C.5

I would try to first draw out the Lewis structure to see how many lone pairs there are. The three nitrogens in HN(CH2CH2NH2)2 each have a lone pair, so they have the ability to bind to a metal center. I hope that helps.
by BaileyB1F
Fri Dec 04, 2020 11:09 pm
Forum: Lewis Acids & Bases
Topic: Example Problem
Replies: 5
Views: 59

Example Problem

I'm having trouble with finding the oxidation state of transition metals and was hoping someone could explain this example to me: Ag and (NH3)2
Thank you
by BaileyB1F
Fri Dec 04, 2020 10:51 pm
Forum: Bronsted Acids & Bases
Topic: Textbok Problem J.1
Replies: 4
Views: 51

Re: Textbok Problem J.1

According to this website https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book%3A_The_Basics_of_GOB_Chemistry_(Ball_et_al.)/10%3A_Acids_and_Bases/10.02%3A_Brnsted-Lowry_Definition_of_Acids_and_Bases "Because the water molecule donates a hydrogen ion to the ammonia, it is the Brøn...
by BaileyB1F
Fri Dec 04, 2020 6:55 pm
Forum: General Science Questions
Topic: Tricks for Knowing Locations of Metals and Nonmetals on Periodic Table
Replies: 8
Views: 101

Re: Tricks for Knowing Locations of Metals and Nonmetals on Periodic Table

I don't have any fast way to memorize it, but I like to look at it like a staircase where everything is a metal on the left of there periodic table (except for hydrogen) and then the staircase separates the metals from the non-metals. The staircase is all of the metalloids and to memorize it, you co...
by BaileyB1F
Fri Dec 04, 2020 6:42 pm
Forum: Lewis Acids & Bases
Topic: Transition Metals and Lewis acids and bases
Replies: 1
Views: 20

Transition Metals and Lewis acids and bases

For the example CuCl5, Cu is the transmission metal and is also a Lewis acid while the Cl is a Lewis base. Is the transmission metal always going to be the Lewis acid and accept the electron from the atom it bonds with? Is there a specific way to tell?
by BaileyB1F
Fri Nov 27, 2020 10:59 pm
Forum: Hybridization
Topic: Terminal Atoms
Replies: 1
Views: 30

Re: Terminal Atoms

The terminal atom gives the needed amount of electrons for stability. Cl donates its electrons to stay sp3 and can't hybridize as a result. I think this is correct, but I would get a second opinion, hope this helps.
by BaileyB1F
Fri Nov 27, 2020 10:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Strength
Replies: 1
Views: 25

Bond Strength

Why are lone pair and lone pair bonds stronger bonds than bonding electrons and bonding electrons?
by BaileyB1F
Fri Nov 27, 2020 8:39 pm
Forum: Sigma & Pi Bonds
Topic: Sapling Learning Week 7 and 8 Homework Question 16
Replies: 4
Views: 38

Re: Sapling Learning Week 7 and 8 Homework Question 16

According to Sapling, delocalized pi bonds occur when pi orbitals extends over more than two atoms. In terms of Lewis structures, this occurs with resonance structures involving double and triple bonds. O3 and CO3- have resonance structures, but H2O and HCN don't have a second resonance structure th...
by BaileyB1F
Fri Nov 27, 2020 7:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Practice Problem
Replies: 3
Views: 17

Practice Problem

One question from a practice problem for identifying the shape and bond angles was PCl5. The answer was that the shape was trigonal bipyramidal and the bond angles included 90, 120, and 180 degrees. I understand where the 90 and 180 degrees comes from, but I have no clue where that 120 came from. Th...
by BaileyB1F
Fri Nov 27, 2020 7:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Geometry
Replies: 7
Views: 51

Molecular Geometry

Hi, I was wondering if anyone had any tips for remembering the molecular geometry (trigonal pyramidal, linear, t-shaped, octahedral, etc.). Are there any acronyms or chart that could be helpful when identifying the molecular geometry? Thank you.
by BaileyB1F
Fri Nov 20, 2020 10:09 pm
Forum: Sigma & Pi Bonds
Topic: d orbital
Replies: 2
Views: 56

Re: d orbital

According to this website, https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Book%3A_Introduction_to_Inorganic_Chemistry/02%3A_Molecular_Orbital_Theory/2.04%3A_σ%2C_π%2C_and_δ_orbitals, d orbitals can form sigma bonds. I'm not sure about the rest of your question, but the website might hav...
by BaileyB1F
Fri Nov 20, 2020 8:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Tips for memorizing different molecular shapes
Replies: 9
Views: 85

Re: Tips for memorizing different molecular shapes

Hi, I don't have any ways to memorize it yet myself, but I found this cool Youtube video that breaks it down and uses the an example of remembering it like a BLT sandwich. I hope that helps!

https://www.youtube.com/watch?v=GnXSGR- ... =emb_title
by BaileyB1F
Fri Nov 20, 2020 8:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Stable Structures
Replies: 10
Views: 70

Re: Stable Structures

Yes, I think we do have to consider the most stable structure. Like in the lecture video on Wednesday from this week, try thinking of removing the individual atoms and seeing how stable they would be if you removed one from the side or one from the top (seesaw example). The more stable structure wil...
by BaileyB1F
Fri Nov 20, 2020 7:32 pm
Forum: Ionic & Covalent Bonds
Topic: Textbook Problem 2A.9 and 2A.11
Replies: 3
Views: 38

Textbook Problem 2A.9 and 2A.11

I'm confused about the reasoning behind the answers for these problems. 2A.9 asks about the M2+ ions that have the following ground-state [Ar]3d^7 and the answer is cobalt 2+ but when 2A.11 asks about M3+ ions that have the ground-state [Ar] 3d^6 the answer is also cobalt. Can someone please explain...
by BaileyB1F
Fri Nov 20, 2020 7:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 9
Views: 64

Re: Bond Angle

Online it says the angle measurement for the 'seesaw' molecular shape is between 90 and 120 degrees but I'm not sure about the second question. I think it might not depend on the exact atoms in the molecule since its more about the shape, but I'm not sure that is correct. I hope that helps!
by BaileyB1F
Fri Nov 13, 2020 8:07 pm
Forum: Resonance Structures
Topic: Does H2SO3 have a resonance structure?
Replies: 2
Views: 13

Re: Does H2SO3 have a resonance structure?

I found this video on YouTube that shows how to draw the resonance structure for H2SO3. I hope this helps
https://www.youtube.com/watch?v=zJofo4QDrJM
by BaileyB1F
Fri Nov 13, 2020 7:31 pm
Forum: Ionic & Covalent Bonds
Topic: Orbitals
Replies: 3
Views: 30

Orbitals

How does Schrodinger's equation relate to orbitals?
Someone explained this to me before in a tutoring session, but I still don't understand it.
by BaileyB1F
Fri Nov 13, 2020 7:25 pm
Forum: Dipole Moments
Topic: What is a dipole moment?
Replies: 4
Views: 39

Re: What is a dipole moment?

For the first part of your question, a dipole moment is just the separation of charge between atoms in a bond (ionic or covalent). An example would be H20 where the hydrogens have a net positive charge separate from the oxygen net negative charge. The dipole moment vectors are towards the oxygen bec...
by BaileyB1F
Fri Nov 13, 2020 6:53 pm
Forum: Resonance Structures
Topic: bond length
Replies: 6
Views: 25

Re: bond length

Bond length increases down a group because the atomic radius increases.
by BaileyB1F
Fri Nov 13, 2020 6:50 pm
Forum: Resonance Structures
Topic: bond length
Replies: 6
Views: 25

Re: bond length

To check on the periodic table, you have to look at the trend for bonding. Bond length increases down a group and decreases across the period.I hope that helps
by BaileyB1F
Fri Nov 13, 2020 6:32 pm
Forum: Resonance Structures
Topic: lewis base or acid
Replies: 15
Views: 124

Re: lewis base or acid

An example to help understand is FeCl3 + Cl-. The Cl- is a base because it is going to donate its electron to FeCl3, making FeCl3 the base because it accepts the electron.
by BaileyB1F
Fri Nov 06, 2020 9:55 pm
Forum: Lewis Acids & Bases
Topic: Arrhenius acids and bases
Replies: 1
Views: 20

Arrhenius acids and bases

For this class, are we going to go over the Arrhenius acids and bases or are we only reviewing Lewis and Bronsted-Lowry acids and bases definition? Is there a major difference between the three of them that we will see in classwork problems?
by BaileyB1F
Fri Nov 06, 2020 9:49 pm
Forum: Student Social/Study Group
Topic: Making it through Midterm Results
Replies: 13
Views: 143

Re: Making it through Midterm Results

I didn't do well either. To make myself feel better, I talk to my friends and family about it to see what they think or if they had similar experiences. Just hearing them talk about their struggles with midterms or classes helps me to not feel so alone about my performance on the midterm. My advice ...
by BaileyB1F
Fri Nov 06, 2020 1:47 pm
Forum: Electronegativity
Topic: Electronegativity trend
Replies: 18
Views: 109

Re: Electronegativity trend

This image helps to clarify the ionization and electronegativity. It's the lowest at the lower left of the periodic table (Cs) and it increases to the upper right at the highest level (F). Hope that helps. https://www.google.com/url?sa=i&url=https%3A%2F%2Frevisionscience.com%2Fa2-level-level-rev...
by BaileyB1F
Fri Nov 06, 2020 11:25 am
Forum: Ionic & Covalent Bonds
Topic: Covalent Character
Replies: 4
Views: 29

Re: Covalent Character

This response does not fully answer your question, but I found this website that describes the covalent and ionic bond relationship and a bit on polarity that might help. https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Supplemental_Modules_(Organic_Chemistry)/Fundamentals/Ionic_and_Covalen...
by BaileyB1F
Fri Nov 06, 2020 2:06 am
Forum: Lewis Structures
Topic: How to find valence electrons of an element
Replies: 6
Views: 95

Re: How to find valence electrons of an element

This question may also be something that Professor Lavelle already said or something that I should already know, but I was wondering why the transition metals in the middle of the periodic table don't have any tabled number of valence electrons like how we can tell the valence electrons of the other...
by BaileyB1F
Fri Nov 06, 2020 1:55 am
Forum: Student Social/Study Group
Topic: Veterans Day
Replies: 16
Views: 140

Re: Veterans Day

I'm not sure about lecture or discussion, but for my other classes they are not having discussions on Wednesday, but they still want us to attend another section during the week to complete our work.
by BaileyB1F
Fri Oct 30, 2020 9:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Shells
Replies: 7
Views: 65

Re: Electron Shells

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.pngwing.com%2Fen%2Ffree-png-sgwyq&psig=AOvVaw3hcjqpisl69J_VY-bGwIdR&ust=1604205237071000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCNC8wrGA3uwCFQAAAAAdAAAAABAD This image shows the orbital diagram. This just helps to visually ...
by BaileyB1F
Fri Oct 30, 2020 9:27 pm
Forum: Properties of Electrons
Topic: Ejected Electron Problem
Replies: 1
Views: 38

Ejected Electron Problem

A scientist plans on using the ejected photoelectrons in future electron diffraction experiments. For one such study, she needs the wavelength of the ejected photoelectron to be approximately 9 Angstrom (10 Angstrom=1 nm). If she irradiates the metal with 325 nm light, which of the three metals shou...
by BaileyB1F
Fri Oct 30, 2020 7:30 pm
Forum: Properties of Electrons
Topic: Practice Problem
Replies: 3
Views: 40

Practice Problem

An electron ejected from zinc has a velocity 4.0x10^6 m/s. If 9.83x10^-19J of energy are required to remove an electron from a zinc atom, what was the frequency of light incident on the atom?

I got this problem from a study partner and I am having trouble on the steps of solving this problem.
by BaileyB1F
Fri Oct 30, 2020 7:15 pm
Forum: DeBroglie Equation
Topic: Sapling Homework #14
Replies: 2
Views: 34

Re: Sapling Homework #14

For this problem, you have to set up the equation to solve for Ephoton by plugging in (6.626x10^-34)/[(9.11x10^-31)(2.5x10^-6)]. Then plug the answer (290.933) into the kinetic energy relationship (1/2)(9.11x10^-31)(290.933)^2 and you should get 3.86 x 10^-26. This is how you find the E electron (wh...
by BaileyB1F
Fri Oct 30, 2020 3:26 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Vs. Covalent
Replies: 7
Views: 77

Re: Ionic Vs. Covalent

An example of an ionic bond is NaCl (sodium chloride), sodium loses an electron because that electron is in the outermost shell making it Na+ and this means chlorine takes that electron making it Cl-. An example of a covalent bond is H2O (water), oxygen and hydrogen share their electrons.
by BaileyB1F
Fri Oct 23, 2020 8:32 pm
Forum: DeBroglie Equation
Topic: Practice Problem
Replies: 7
Views: 62

Practice Problem

Determine the de Broglie wavelength (in nm) associated with a neutron traveling at a speed of 5.0 × 10 3 m/s. The mass of a neutron is 1.67 × 10 –24 g.
When I did this problem, I 7.94 x 10^-14, but it wasn't the right answer and I'm not sure where I went wrong.
by BaileyB1F
Fri Oct 23, 2020 8:24 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wording of Problems
Replies: 4
Views: 64

Re: Wording of Problems

With word problems, I like to underline what it states so I know what's missing from the equation and remember to not juts underline the numbers, but also the units because it might ask you to convert from one unit to another.
by BaileyB1F
Fri Oct 23, 2020 8:04 pm
Forum: Properties of Electrons
Topic: Understanding energy transitions
Replies: 4
Views: 44

Re: Understanding energy transitions

Another way to think about it is like a set of stairs. It takes more energy to climb form the first floor to the sixth floor than from the fifth floor to the sixth floor. For both cases, going up the stairs requires energy (just remember that going down the stairs, from n=6 to n=1, releases energy),...
by BaileyB1F
Wed Oct 21, 2020 5:01 pm
Forum: Student Social/Study Group
Topic: Heisenberg's Indeterminacy Equation
Replies: 1
Views: 25

Re: Heisenberg's Indeterminacy Equation

I'm not sure if this is right, but another student from this class said on this discussion forum that, "h/4pi is an experimentally determined constant. Basically, it exists to show that there is a limit to the certainty to which you can know the position and the momentum of the particle simulta...
by BaileyB1F
Wed Oct 21, 2020 4:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Webcam for Midterms [ENDORSED]
Replies: 4
Views: 90

Re: Webcam for Midterms [ENDORSED]

I heard the same from my TA about only needing one camera, and they also said some students put the external camera on a stack of books or even tape their phones to a spatula to hold it up (just a tip).
by BaileyB1F
Sun Oct 18, 2020 11:58 pm
Forum: *Black Body Radiation
Topic: Midterm
Replies: 14
Views: 240

Re: Midterm

It's not on the midterm (just worry about it if you take Physics).
by BaileyB1F
Sun Oct 18, 2020 11:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Notetaking and Organization
Replies: 7
Views: 65

Re: Notetaking and Organization

A trick I use to retain information is flashcards that go over definitions and equations. I also used colored pens to emphasize key terms or things that are important to remember. For organizing everything in your notebook, I say using colored sticky notes to distinguish which section or unit we're ...
by BaileyB1F
Sun Oct 18, 2020 11:54 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1381

Re: How are you studying?

I work focus on understanding the material throughout the week and then on the weekend I work on practice problems.
by BaileyB1F
Sun Oct 18, 2020 4:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Exams
Replies: 12
Views: 99

Re: Exams

If we are given the constants sheet, are we also going to be given a conversion sheet for cm to m, or do we just need to already know how to do those?
by BaileyB1F
Sun Oct 18, 2020 4:47 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactants (Practice Problem)
Replies: 5
Views: 52

Limiting Reactants (Practice Problem)

A 2.00 g sample of ammonia is mixed with 4.00 g of oxygen. Which is the limiting reactant and how much excess reactant remains after the reaction has stopped?
The Balanced Equation 4NH3 + 5O2 --> 4NO + 6H2O.
What do we do after calculating the moles of the reactants?
by BaileyB1F
Mon Oct 12, 2020 8:11 pm
Forum: Administrative Questions and Class Announcements
Topic: Quizzes in Discussion Sections?
Replies: 6
Views: 83

Re: Quizzes in Discussion Sections?

Same, my TA is just giving practice quizzes (not graded) and told us to download Respondus (which we'll need for the Midterms). I downloaded it, but I have no clue where it went on my computer, I can't find it.
by BaileyB1F
Sat Oct 10, 2020 9:53 pm
Forum: Molarity, Solutions, Dilutions
Topic: Photoelectric Effect
Replies: 6
Views: 113

Photoelectric Effect

Can someone please explain number 31 from the Photoelectric Effect assessment? I don't know the steps to completing this problem. This and the following question relates to the same metal used in a series of photoelectric experiments. A. If 3.607 x 10-19 J is required to remove an electron with zero...
by BaileyB1F
Sat Oct 10, 2020 9:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Due Time
Replies: 8
Views: 51

Re: Homework Due Time

And remember to check your myucla or ccle to see your grade when you complete the homework assignment. It might take a few minutes to load, but it's just helpful to keep track of assignments.
by BaileyB1F
Sat Oct 10, 2020 9:31 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 240
Views: 36217

Re: Final Jitters

I try to take a couple deep breaths, close my eyes and tell myself some words of encouragement (You got this, try your best, take your time), and removing anything that could distract me.
by BaileyB1F
Sat Oct 10, 2020 9:25 pm
Forum: Significant Figures
Topic: Number of Sig Figs according to a question.
Replies: 5
Views: 23

Re: Number of Sig Figs according to a question.

I like to pretend there's an arrow going through the zeros on both sides of the number. So for 0.12345 there would be 5 significant figures because the present arrow goes straight through the zero and once it hits a number that's not zero (in this case it would hit the 1), then we start counting. Fo...
by BaileyB1F
Sat Oct 10, 2020 5:02 pm
Forum: Student Social/Study Group
Topic: Forming Virtual Study Group
Replies: 31
Views: 199

Re: Forming Virtual Study Group

I would love that too! Would we have multiple sessions so everyone has a chance to attend (like some during the week and some on the weekends)?
by BaileyB1F
Sat Oct 10, 2020 5:00 pm
Forum: Administrative Questions and Class Announcements
Topic: Respondus
Replies: 8
Views: 107

Re: Respondus

Hi, is there a deadline for when we have do download Respondus? And was this on the class website somewhere, or in the syllabus?
And I don't think we have a quiz every week, most likely just the 2 midterms and the final, but I would want to double check with a TA or Dr. Lavelle first.

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