Search found 57 matches
- Tue Dec 03, 2019 8:49 pm
- Forum: Naming
- Topic: Roman numerals
- Replies: 7
- Views: 499
Re: Roman numerals
The roman numerials represent the oxidation number of the transition metal.
Naming
Does anyone have a good tactic for memorizing the names of ligands?
- Tue Dec 03, 2019 8:46 pm
- Forum: Naming
- Topic: Polydentate
- Replies: 2
- Views: 385
Polydentate
How do we tell if a molecule is polydentate?
Formulas
Do we need to know the formula for EDTA for this test?
- Tue Dec 03, 2019 12:02 pm
- Forum: General Science Questions
- Topic: Exam Subjects
- Replies: 5
- Views: 491
Exam Subjects
Does anyone know what the ratio of subjects will be on the final exam? For example, I know the exam will cover all major topics however, will it be more on the topics we haven't been tested on?
- Mon Dec 02, 2019 10:22 pm
- Forum: Ionic & Covalent Bonds
- Topic: intermolecular vs intramolecular
- Replies: 17
- Views: 1867
intermolecular vs intramolecular
What is the difference between intermolecular and intramolecular bonding?
- Mon Dec 02, 2019 10:20 pm
- Forum: General Science Questions
- Topic: Final test locations
- Replies: 4
- Views: 279
Re: Final test locations
Yes, he just updated this on his class website today under "Final Exam: Review Sessions and Exam Venues."
- Mon Dec 02, 2019 10:18 pm
- Forum: General Science Questions
- Topic: 50 post grade
- Replies: 25
- Views: 1737
Re: 50 post grade
Does anyone currently have the grades for the weekly discussion posts in their gradebook? Mine currently says N/A, I have been persistent about doing 5 posts a week, but it still scares me not knowing my current progress.
- Mon Dec 02, 2019 10:16 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 9
- Views: 444
Re: Coordination Number
Yes the coordination number is determined by the # of atoms bonded directly to the central atom. If an atom is polydentate, take that into account when calculating this number. For instance if a bond is bidentate make sure to multiply that bond by 2 when calculating the coordination number.
- Mon Dec 02, 2019 10:12 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Inductive Effect
- Replies: 1
- Views: 169
Inductive Effect
What is exactly the inductive effect and how does it help to determine strong acids/bases vs weak acids/bases?
- Mon Dec 02, 2019 10:11 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong Acids
- Replies: 3
- Views: 204
Strong Acids
Should we memorize strong acids and bases for the final??
- Mon Nov 25, 2019 7:59 pm
- Forum: Amphoteric Compounds
- Topic: Oxides
- Replies: 4
- Views: 362
Re: Oxides
You can tell by looking at the periodic table... metal oxides for bases, nonmetal oxides form acids, and the elements Pb, Bi, Sn, In, Ga, Al, Be, Ge, As, and Sb as oxides form amphoteric (both an acid and a base). Hope this helps!
- Mon Nov 25, 2019 7:55 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling point
- Replies: 11
- Views: 1148
Re: Boiling point
As many students have stated molar mass and boiling point are directly proportional. When it comes to intermolecular forces, London dispersion forces increase with larger molecules thus increasing the boiling point. Hope this helps!
- Mon Nov 25, 2019 7:53 pm
- Forum: Hybridization
- Topic: Composition of each bond
- Replies: 2
- Views: 190
Composition of each bond
Do we need to know how to find the composition of each bond and lone pair in the form sigma( ) and pi ( )?
- Mon Nov 25, 2019 7:51 pm
- Forum: Hybridization
- Topic: 2F.15
- Replies: 3
- Views: 157
Re: 2F.15
I believe by saying the S character increases, the s orbital is becoming prominent. So sp (one has 2 hybridized orbitals, one s and one p) has a larger bond angle than sp2 (which has 3 hybridized orbitals, 1 s and 2 p). etc. Hope this helps!
- Mon Nov 25, 2019 7:48 pm
- Forum: Naming
- Topic: Naming for Final
- Replies: 3
- Views: 204
Re: Naming for Final
For naming I believe you just need to know the ligands in the table 9C.1. Hope this helps!
- Mon Nov 18, 2019 1:28 pm
- Forum: Student Social/Study Group
- Topic: Test 2
- Replies: 5
- Views: 308
Re: Test 2
I just had lecture and Dr. Lavelle stated that all the concepts covered in class since the midterm will be on test #2, except hybridization. Hope this helps!
- Mon Nov 18, 2019 1:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR, Molecular Geometry, and Molecular Shape
- Replies: 4
- Views: 349
Re: VSEPR, Molecular Geometry, and Molecular Shape
Electron geometry/ arrangement describes the number of bonding regions. For example: NH3 the electron geometry/ # of bonding regions is 4 or tetrahedral, however since there is one lone pair the shape/molecular geometry would be described as trigonal pyramidal. Hope this helps!
- Mon Nov 18, 2019 1:20 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma vs Pi
- Replies: 11
- Views: 675
Re: Sigma vs Pi
You should know the differences pi and sigma bonds form in orbital overlap. Pi bonds form side-to-side while sigma bonds form end to end. Additionally, single bonds are made up of one sigma bond, double bonds are made up of one sigma and one pi bond, and triple bonds are made up of one sigma and two...
- Mon Nov 18, 2019 1:18 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test #2
- Replies: 22
- Views: 2859
Re: Test #2
Dr. Lavelle just clarified in class today that test #2 will cover everything since the midterm: VSEPR, intermolecular forces, pi and sigma bonding, ionic vs covalent, and polarity. No hybridization will be on this test! Hope this helps!
- Mon Nov 18, 2019 1:13 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs covalent
- Replies: 2
- Views: 249
Ionic vs covalent
What is the best way to tell which bonds are more covalent or ionic in character?
- Tue Nov 12, 2019 2:59 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Test #2
- Replies: 22
- Views: 2859
Re: Test #2
Past students said the test contained periodic trends, lewis dot, and radicals, but I am unsure if it is the same this year. Please, someone clarify which homework sections this test will cover. Thank you!!
- Tue Nov 12, 2019 2:56 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling and Melting points
- Replies: 8
- Views: 390
Boiling and Melting points
Do we need to memorize the boiling and melting points of each type of interaction? Also which interaction has the greatest energy and therefore has the highest melting and boiling point? Thank you!
- Tue Nov 12, 2019 2:54 pm
- Forum: Dipole Moments
- Topic: Types of Interactions
- Replies: 2
- Views: 219
Types of Interactions
Are we primarily focusing on dipole-dipole, london dispersion, and hydrogen bonding in this class?? The homework sections are 3F.4 and 3F.5, which only cover these topics.
- Tue Nov 12, 2019 2:50 pm
- Forum: Electronegativity
- Topic: electronegativity
- Replies: 5
- Views: 417
Re: electronegativity
Polar bonds mean that there is electronegativity difference, and nonpolar bonds don't have an electronegativity difference, like N2. Hope this helps!
- Tue Nov 12, 2019 9:02 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test #2
- Replies: 22
- Views: 2859
Test #2
Hi! What topics will be covered in this next test?
- Tue Nov 05, 2019 5:24 pm
- Forum: General Science Questions
- Topic: Coordinate covalent bonds/ Lewis acids and bases
- Replies: 1
- Views: 105
Coordinate covalent bonds/ Lewis acids and bases
For this exam do we need to know extensive detail on the concepts of Lewis acids and bases and coordinate covalent bonds??
- Tue Nov 05, 2019 3:12 pm
- Forum: SI Units, Unit Conversions
- Topic: When to use scientific notation
- Replies: 4
- Views: 281
Re: When to use scientific notation
I believe you can always convert to scientific notation as long as the correct # of sig fig's is satisfied. Additionally, scientific notation is a much simpler way of writing very small numbers such a 4.76 x 10^-18. For me, converting to scientific notation has eliminated errors such as forgetting a...
- Tue Nov 05, 2019 3:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Bonding review session
- Replies: 1
- Views: 72
Bonding review session
I was planning on attending tonight's chemical bonding review session. Does anyone know when he will be rescheduling this?
- Tue Nov 05, 2019 3:07 pm
- Forum: General Science Questions
- Topic: Schrodinger's Equation [ENDORSED]
- Replies: 1
- Views: 172
Schrodinger's Equation [ENDORSED]
Hi! I am confused on what we need to know about Schrodinger's Equation and what the major concept is behind it?
- Tue Nov 05, 2019 3:06 pm
- Forum: General Science Questions
- Topic: Bohr's Frequency Equation
- Replies: 1
- Views: 138
Bohr's Frequency Equation
I thought I heard that Bohr's frequency equation won't be provided on the constants sheet. Is this true?
- Tue Nov 05, 2019 3:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Exam [ENDORSED]
- Replies: 1
- Views: 145
Midterm Exam [ENDORSED]
Hi! What materials are needed for this first midterm exam?
- Tue Oct 29, 2019 2:25 pm
- Forum: General Science Questions
- Topic: Units
- Replies: 4
- Views: 224
Re: Units
Thank you everyone! I didn't realize we would be provided a list of constants. It would be a good idea for me to do the practice problems with this sheet to cancel out units.
- Tue Oct 29, 2019 2:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: woohoo Some Early Quantum Questions
- Replies: 2
- Views: 404
Re: woohoo Some Early Quantum Questions
Hi! Would you be able to post answers to these questions in a couple days?
- Tue Oct 29, 2019 2:18 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Energy
- Replies: 1
- Views: 79
Re: Energy
Yes, correct. Electrons that are in the first energy level (energy level 1) are closest to the nucleus and will have the lowest energy. Electrons further away from the nucleus will have higher energy. However, remember as you go down a group the ionization energy decreases because it is easier to ta...
- Tue Oct 29, 2019 2:15 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm review sessions
- Replies: 3
- Views: 255
Midterm review sessions
I saw today there are review sessions for fundamentals and early quantum. Since I can't make these today do you think he will be holding other sessions on these same topics??
- Tue Oct 29, 2019 2:11 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Topics
- Replies: 3
- Views: 202
Midterm Topics
Hi! I was wondering what subjects will be covered on the midterm? Fundamentals, Quantum, and Chemical bonds? Thank you!
- Tue Oct 22, 2019 3:08 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Knowing the nm of light
- Replies: 2
- Views: 86
Knowing the nm of light
Does anyone know if for the midterm we will be provided the wavelength (nm) corresponding to each light on the spectrum, or if we have to memorize these? Thank you!
- Tue Oct 22, 2019 3:05 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: 1D.13
- Replies: 3
- Views: 189
Re: 1D.13
So for this question you know that the d orbital corresponds to l=2. And for that reason there are four values of ml: -2,-1,0,1,2. Hope this helps!
- Tue Oct 22, 2019 3:03 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: n,l,ml,and ms
- Replies: 2
- Views: 7642
n,l,ml,and ms
Hi! I was wondering what the conceptual differences are between n,l,ml,and ms. Which is considered the orbital, the shell, or the subshell? Thank you!
- Tue Oct 22, 2019 3:00 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Excited state vs ground state
- Replies: 4
- Views: 173
Excited state vs ground state
Hi! Does anyone know how to tell the difference between an electron configuration of the ground state and the electron configuration of an excited state? One of the homework problems in section E pertains to this.
- Tue Oct 22, 2019 2:59 pm
- Forum: General Science Questions
- Topic: Units
- Replies: 4
- Views: 224
Units
I'm having trouble with units when conducting some of these problems. Could anyone help me with the units of velocity, threshold energy, Plank's constant, and frequency?
- Mon Oct 14, 2019 1:28 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1B #25
- Replies: 1
- Views: 114
Re: 1B #25
Hi! So the uncertainty equation states that uncertainty in momentum (delta p) * the uncertainty in position (delta x) is greater than or equal to h/4pi. So first we convert 350 pico-meters to meters which is your delta x. Then you calculate (6.626 x10^-34)/ (4)*(3.14)*(350 x10^-12m) to find the unce...
- Mon Oct 14, 2019 1:19 pm
- Forum: Properties of Electrons
- Topic: 1B.15 Question
- Replies: 2
- Views: 209
Re: 1B.15 Question
Hi! So for part c you first use the photo electric effect equation where E(photon)-threshold energy= kinetic energy (1/2 mv^2). After calculating this you find your energy of a photon, but since it asks for wavelength you plug this energy into the equation E=h*v to find v or frequency and use this f...
- Mon Oct 14, 2019 1:12 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Question about 1A.15
- Replies: 2
- Views: 152
Re: Question about 1A.15
Hi! I believe this is because Ultraviolet light lies within the Lyman Series which ends at n=1. Hope this answers your question.
- Mon Oct 14, 2019 1:10 pm
- Forum: Photoelectric Effect
- Topic: Homework Question 1B.9
- Replies: 2
- Views: 138
Homework Question 1B.9
Hi could someone help me with the set up of 1B.9? "A lamp rated at 32W (1W=1J.s^-1) emits violet light of wavelength 420nm. How many photons of violet light can the lamp generate in 2.0s? How many moles of photons are emitted in that time interval?
- Mon Oct 14, 2019 12:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework 3 due during discussion in week 4
- Replies: 1
- Views: 90
Homework 3 due during discussion in week 4
Hi,
I was wondering if Homework 3 (due during discussion in week 4) is only on chemical bonds, or both quantum and chemical bonds?
Thank you!
I was wondering if Homework 3 (due during discussion in week 4) is only on chemical bonds, or both quantum and chemical bonds?
Thank you!
- Tue Oct 08, 2019 8:31 am
- Forum: Student Social/Study Group
- Topic: Preparation for Week 2 test
- Replies: 3
- Views: 176
Re: Preparation for Week 2 test
Thank you both. I will bring a pen and scientific calculator to discussion.
- Tue Oct 08, 2019 8:31 am
- Forum: Limiting Reactant Calculations
- Topic: question M.11
- Replies: 3
- Views: 238
Re: question M.11
To find the excess in the first reaction do you compare the molar ratios of the reactants to each other? For instance, .047 moles of P4 * (3 mol of O2/ 1 mol of P4) and .18 moles of O2 * (1mol of P4/ 3 mol of O2) ? From there I found that P4 is limiting and oxygen is in excess so you would subtract ...
- Mon Oct 07, 2019 10:46 pm
- Forum: Student Social/Study Group
- Topic: Preparation for Week 2 test
- Replies: 3
- Views: 176
Preparation for Week 2 test
I have my test tomorrow in discussion. Do we need to write our answers in pen? I want to be prepared with the right material tomorrow.
- Mon Oct 07, 2019 10:44 pm
- Forum: Limiting Reactant Calculations
- Topic: question M.11
- Replies: 3
- Views: 238
question M.11
A reaction vessel contains 5.77g of white phosphorous and 5.77 g of oxygen. The first reaction to take place is the formation of phosphorous (III) oxide, P4O6: P4+ 3O2 -> P4O6. If enough oxygen is present, the oxygen can react further with this oxide to produce phosphorous (v) oxide, P4O10: P4O6 + 2...
- Mon Oct 07, 2019 10:34 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 17474
Re: Test 1 [ENDORSED]
I emailed my TA and received confirmation that we don't need to purchase as blue book and that everything will be provided in discussion.
- Wed Oct 02, 2019 12:27 pm
- Forum: Administrative Questions and Class Announcements
- Topic: First Test in Discussion
- Replies: 13
- Views: 690
Re: First Test in Discussion
What resources are you going to use to study for this initial test?
- Wed Oct 02, 2019 12:26 pm
- Forum: Administrative Questions and Class Announcements
- Topic: First Test in Discussion
- Replies: 13
- Views: 690
Re: First Test in Discussion
Thank you all. I will now be able to simplify my studying.
- Wed Oct 02, 2019 11:03 am
- Forum: Administrative Questions and Class Announcements
- Topic: First Test in Discussion
- Replies: 13
- Views: 690
First Test in Discussion
Does anyone know if this first test includes the properties of light or if it is just the review of fundamentals/high school chemistry?
- Mon Sep 30, 2019 4:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice on Homework
- Replies: 13
- Views: 1582
Re: Advice on Homework
Hello! In my experience it has been helpful to do all the problems so you can be exposed to as many concepts and ways of phrasing questions as possible. Hope this helps!
- Mon Sep 30, 2019 4:47 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 244827
Re: Advice from a Medical Student - Part II [ENDORSED]
What an incredible story! Thank you for sharing. Was your path to achieving your pre-med degree at UCLA difficult? Do you have any advice for a second year like me following a similar path? Thank you!!