Search found 31 matches
- Tue Dec 04, 2018 8:46 pm
- Forum: Bronsted Acids & Bases
- Topic: 6th edition J.11
- Replies: 1
- Views: 402
6th edition J.11
In part c, can someone explain to me why HI is the acid and CaO is the base please?
- Tue Dec 04, 2018 8:11 pm
- Forum: General Science Questions
- Topic: Can We Take The Final In Pencil?
- Replies: 14
- Views: 1630
Re: Can We Take The Final In Pencil?
I'm pretty sure only the things written in pen will be graded. If anything, start with pencil and then write out your answer in pen when you're confident with it.
- Tue Dec 04, 2018 8:08 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 1
- Views: 264
Re: Polydentate
It always helps to draw out the lewis structure and see if it can form a bond to the transition metal in two places at the same time
- Sun Dec 02, 2018 8:58 pm
- Forum: Bronsted Acids & Bases
- Topic: Fundamentals J.1 Bronsted Acids and Bases
- Replies: 2
- Views: 419
Fundamentals J.1 Bronsted Acids and Bases
How can you tell if a compound is a bronsted acid or base without looking at the chemical equation? I know an acid loses a proton and a base gains one, but how can you tell if it loses or gains one in the first place?
- Fri Nov 30, 2018 9:56 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation number
- Replies: 1
- Views: 298
Oxidation number
Hi can someone explain how to find oxidation numbers like in 17.29 (6th edition) for example? thanks
- Fri Nov 30, 2018 9:47 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Covalent Character
- Replies: 3
- Views: 1997
Re: Covalent Character
The greater the electronegativity difference there is between two atoms, the more ionic it is and the less covalent it is. So the less difference in electronegativity, the more covalent character it has.
- Fri Nov 30, 2018 9:41 pm
- Forum: Naming
- Topic: Naming Coordination Compounds
- Replies: 1
- Views: 336
Re: Naming Coordination Compounds
this was pretty helpful for me
http://www.chemistry.wustl.edu/~edudev/ ... _comp.html
http://www.chemistry.wustl.edu/~edudev/ ... _comp.html
- Sun Nov 25, 2018 8:53 am
- Forum: Sigma & Pi Bonds
- Topic: Why are sigma bonds stronger than pi bonds?
- Replies: 10
- Views: 4712
Re: Why are sigma bonds stronger than pi bonds?
a head-on/linear overlap (sigma bond) will be stronger as opposed to a perpendicular/sideways overlap (pi bond)
- Sun Nov 25, 2018 8:45 am
- Forum: Dipole Moments
- Topic: canceling dipoles
- Replies: 2
- Views: 427
canceling dipoles
in which situations exactly do dipole cancel each other out?
- Sun Nov 25, 2018 8:41 am
- Forum: Hybridization
- Topic: d orbital
- Replies: 2
- Views: 362
d orbital
when do you know to include d in hybridized orbitals?
- Sun Nov 18, 2018 12:18 am
- Forum: Hybridization
- Topic: Test 3
- Replies: 5
- Views: 754
Re: Test 3
Here's the link to the syllabus where it gives all of the outlines
https://lavelle.chem.ucla.edu/wp-conten ... SYLL_1.pdf
https://lavelle.chem.ucla.edu/wp-conten ... SYLL_1.pdf
- Sun Nov 18, 2018 12:10 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 19
- Views: 1399
Re: Test 3
Selina Bellin 3F wrote:does anyone know if the vsepr chart is in the textbook?
I believe it's on pg 103 in the seventh edition
- Sat Nov 17, 2018 11:52 pm
- Forum: Dipole Moments
- Topic: How to Identify Dipole Moments
- Replies: 3
- Views: 442
Re: How to Identify Dipole Moments
Dipole moments occur when there is a difference in electronegativity. It is a measurement of the separation of the two opposite electrical charges.
- Sun Nov 11, 2018 12:41 am
- Forum: Bond Lengths & Energies
- Topic: Interaction Potential Energy
- Replies: 2
- Views: 375
Interaction Potential Energy
Why is interaction potential energy always negative?
- Sun Nov 11, 2018 12:31 am
- Forum: Dipole Moments
- Topic: induced-dipole
- Replies: 3
- Views: 599
induced-dipole
Can someone please clarify what the concept of an induced dipole is? Is it different from a regular dipole? thank you
- Sun Nov 11, 2018 12:28 am
- Forum: Student Social/Study Group
- Topic: Sig Figs on Midterm
- Replies: 13
- Views: 1591
Re: Sig Figs on Midterm
Here's the link to the sig figs guideline from the class website
https://lavelle.chem.ucla.edu/wp-conten ... OUT_SF.pdf
https://lavelle.chem.ucla.edu/wp-conten ... OUT_SF.pdf
- Fri Nov 02, 2018 5:09 pm
- Forum: Octet Exceptions
- Topic: Boron and Aluminum
- Replies: 2
- Views: 356
Re: Boron and Aluminum
In class he said that hydrogen, helium, lithium, and beryllium are exceptions as well
- Fri Nov 02, 2018 5:03 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Valence Electrons in the d-orbitals
- Replies: 2
- Views: 1041
Re: Valence Electrons in the d-orbitals
Transition metals are a little bit different. For transition metals like iron, the amount of valence electrons they have depends on the number of electrons they have after the noble gas core. So for iron: [Ar] 4s^2 3d^6, there are 8 electrons after the noble gas core so it has 8 valence electrons.
- Fri Nov 02, 2018 4:55 pm
- Forum: Photoelectric Effect
- Topic: Kinetic energy
- Replies: 11
- Views: 3335
Re: Kinetic energy
That formula is specifically for kinetic energy so don't think it can be used for other types of energy.
- Thu Oct 25, 2018 11:59 pm
- Forum: Properties of Light
- Topic: Test 2
- Replies: 7
- Views: 718
Re: Test 2
lukezhang1K wrote:Which equations do we have to memorise vs which ones are on the equation sheet?
I'm pretty sure all the equations you'll need will be on the sheet so you don't have to memorize any of them you just have to know how to use them.
- Thu Oct 25, 2018 11:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Exam
- Replies: 7
- Views: 936
Re: Exam
Yeah, if youre talking about test 2 then it's very possible that there will be questions about orbitals.
- Thu Oct 25, 2018 11:53 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Vocabulary confusion
- Replies: 2
- Views: 427
Re: Vocabulary confusion
The principle quantum number determines the energy level and is also called the shell and is labeled as n. The magnetic quantum number labels different orbitals of a subshell and is labeled as mℓ.
- Fri Oct 19, 2018 1:40 pm
- Forum: Student Social/Study Group
- Topic: curve?
- Replies: 20
- Views: 3034
Re: curve?
it says on the syllabus that the class does not use a curve. If you want, here's the link to the syllabus where you can read more about the grading/point system
https://lavelle.chem.ucla.edu/wp-conten ... SYLL_1.pdf
https://lavelle.chem.ucla.edu/wp-conten ... SYLL_1.pdf
- Fri Oct 19, 2018 1:35 pm
- Forum: *Shrodinger Equation
- Topic: Schrodinger Equation
- Replies: 2
- Views: 310
Re: Schrodinger Equation
I think he said we wont be doing calculations with it. He just wanted us to know about it for reference
- Wed Oct 17, 2018 1:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 169855
Re: How to find my posts
Im also confused about how to create a new post/topic. I feel like im missing something
- Tue Oct 09, 2018 11:54 pm
- Forum: General Science Questions
- Topic: Thanksgiving Week
- Replies: 8
- Views: 948
Re: Thanksgiving Week
We only have the thursday and friday off (nov22-23)
- Tue Oct 09, 2018 8:48 pm
- Forum: SI Units, Unit Conversions
- Topic: Test and Exam Dates
- Replies: 10
- Views: 1201
Re: Test and Exam Dates
Yes, according to the test and exam schedule, we have the midterm on Nov 5 and then the next test is on the week after Thanksgiving break.
- Tue Oct 09, 2018 8:41 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Class Website Password
- Replies: 2
- Views: 324
Re: Class Website Password
Im not sure about 14b but for 14a, dr lavelle sent an email out about the class website with the password. So try checking the emails you got from the class email.
- Wed Oct 03, 2018 1:33 pm
- Forum: Empirical & Molecular Formulas
- Topic: When to double moles
- Replies: 13
- Views: 1056
Re: When to double moles
I think in one of the lectures he said that if the number is less than 0.05 from the closest whole number, then its close enough to round it. If not then you probably just have to keep multiplying until you get close enough to the next whole number
- Wed Oct 03, 2018 1:29 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactants
- Replies: 2
- Views: 216
Re: Limiting Reactants
since the ratio of solid calcium carbide to water is 1:2(refer to balanced equation), 1.56 mol of calcium carbide requires 2 x 1.56 = 3.12 mol of water which is less than the 5.55 mol of water that we have. That means we have excess water and not enough calcium carbide. So calcium carbide is the lim...
- Mon Oct 01, 2018 9:16 pm
- Forum: SI Units, Unit Conversions
- Topic: Audio-Visual Focus-Topics, Assessments & Surveys
- Replies: 16
- Views: 1633
Re: Audio-Visual Focus-Topics, Assessments & Surveys
Im not sure when they are due but the assessment scores don't affect our grades at all. So it just matters if you do them or not.