Search found 30 matches
- Sat Dec 08, 2018 8:51 pm
- Forum: Properties of Light
- Topic: limiting reagents
- Replies: 4
- Views: 926
Re: limiting reagents
To find the limiting reagent, you convert the grams of one reactant to moles and do the same to the other and whichever one is lower is your limiting reagent. Percent yield is found by actual yield/theoretical yield x100%.
- Sat Dec 08, 2018 8:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam
- Replies: 22
- Views: 1667
Re: Final Exam
The final will be cumulative and will cover everything from the syllabus.
- Sat Dec 08, 2018 8:46 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: pH
- Replies: 5
- Views: 776
Re: pH
pH would decrease if H+ would increase since it is the main factor that determines the pH.
- Sun Dec 02, 2018 2:42 pm
- Forum: Hybridization
- Topic: Hybridization Notation
- Replies: 10
- Views: 928
Re: Hybridization Notation
Both notations are correct but Lavelle prefers to have it placed at the end like sp3d.
- Sun Dec 02, 2018 2:39 pm
- Forum: Lewis Acids & Bases
- Topic: Strong/Weak Acids & Bases
- Replies: 2
- Views: 320
Re: Strong/Weak Acids & Bases
The Ka values, dissociation constants, will determine how strong or weak an acid or base is.
- Sun Dec 02, 2018 2:37 pm
- Forum: Bronsted Acids & Bases
- Topic: Proton "Donation"
- Replies: 4
- Views: 515
Re: Proton "Donation"
Yeah, a Bronsted Acid should be donating a H+ ion.
- Sat Nov 24, 2018 10:19 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Hydrogen Bonding
- Replies: 5
- Views: 560
Re: Hydrogen Bonding
Hydrogen bonding is an intermolecular force that bonds to N,O, F atoms and is a dipole dipole attraction as well.
- Sat Nov 24, 2018 10:07 pm
- Forum: Hybridization
- Topic: Regions of electron density
- Replies: 6
- Views: 751
Re: Regions of electron density
Yeah regions of electron density will help you figure out the # of hybrid orbitals
- Sat Nov 24, 2018 10:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework for week 9
- Replies: 11
- Views: 1180
Re: Homework for week 9
You should be fine with having all 14 problems under one section as long as you have them.
- Sat Nov 17, 2018 6:53 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Thanksgiving Wednesday Class
- Replies: 19
- Views: 1466
Re: Thanksgiving Wednesday Class
He announced in lecture on Friday that we were ahead of schedule so there would be no lecture next Wednesday.
- Sat Nov 17, 2018 6:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AX3E2 Shape
- Replies: 6
- Views: 1231
Re: AX3E2 Shape
The molecule's shape with 3 ligands and 2 lone pairs would be T-shaped.
- Sat Nov 17, 2018 6:46 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 19
- Views: 1392
Re: Test 3
You should memorize the table so it can help a ton when you're doing the test.
- Sat Nov 10, 2018 5:59 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion Equation
- Replies: 21
- Views: 2833
Re: Combustion Equation
Yes CO2 and H20 are always the products and O2 is one of the reactants
- Sat Nov 10, 2018 5:56 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Hydrogen Bonds
- Replies: 14
- Views: 1046
Re: Hydrogen Bonds
Hydrogen bonds are a type of dipole-dipole force and only work with N, O ,F atoms
- Sat Nov 10, 2018 5:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Trigonal Planar
- Replies: 8
- Views: 983
Re: Trigonal Planar
The actual structure is 3D but the Lewis Structures show it in 2D form to show the bondings and lone pairs the molecule has.
- Sat Nov 03, 2018 2:04 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: f- orbital
- Replies: 3
- Views: 497
Re: f- orbital
The f-orbital consists of the two rows that are outside the periodic table that start at atomic # 57-71 and 89-103.
- Sat Nov 03, 2018 2:02 am
- Forum: Lewis Structures
- Topic: How to decide central atom?
- Replies: 6
- Views: 964
Re: How to decide central atom?
The central atom should be based on the lowest ionization energy and electronegativity.
- Sat Nov 03, 2018 1:50 am
- Forum: Lewis Structures
- Topic: Formal Charges
- Replies: 2
- Views: 227
Re: Formal Charges
The location of the outside atoms should not matter.
- Sun Oct 28, 2018 12:52 pm
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 12
- Views: 1009
Re: Speed of Light
Nothing could be faster than the speed of light.
- Sun Oct 28, 2018 12:49 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond
- Replies: 9
- Views: 909
Re: Bond
They're hardly mentioned and rare so we would only have to be informed of the single, double, and triple bonds.
- Sun Oct 28, 2018 12:47 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations Full or Abbreviated
- Replies: 2
- Views: 295
Re: Electron Configurations Full or Abbreviated
It would be easier to do the abbreviated version using the noble gases but just follow what the instructions say to do just in case.
- Sat Oct 20, 2018 10:34 pm
- Forum: Photoelectric Effect
- Topic: units
- Replies: 12
- Views: 1134
Re: units
Always use meters (m) for wavelength when solving a problem. Also, the units for energy are Joules (J) and should be converted to otherwise.
- Sat Oct 20, 2018 10:31 pm
- Forum: Properties of Light
- Topic: Grades
- Replies: 7
- Views: 674
Re: Grades
Grades should be on CCLE or MyUCLA
- Sat Oct 20, 2018 10:29 pm
- Forum: Student Social/Study Group
- Topic: Test #2
- Replies: 6
- Views: 485
Re: Test #2
I’m pretty sure we do b/c it’s what we’ve learned so far and the test would cover everything up til friday’s lecture.
- Sat Oct 13, 2018 11:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Writing in Pen
- Replies: 13
- Views: 1037
Re: Writing in Pen
You should talk to your TA about it but if not then try practicing with a pen on some of your assignments. i hope this helps
- Sat Oct 13, 2018 11:26 pm
- Forum: Einstein Equation
- Topic: Numbers to memorize [ENDORSED]
- Replies: 37
- Views: 4181
Re: Numbers to memorize [ENDORSED]
I think they give us a sheet that has all the constants and equations along with the test so no.
- Sat Oct 13, 2018 11:18 pm
- Forum: Empirical & Molecular Formulas
- Topic: Going from empirical to Molecular formula
- Replies: 14
- Views: 2218
Re: Going from empirical to Molecular formula
When you divide the mass of the molecular formula by the mass of the empirical formula, you should get a whole number. Or the number could at least be in the #.98-#.00 range.
- Sun Oct 07, 2018 4:43 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular Formula
- Replies: 12
- Views: 601
Re: Molecular Formula
All you have to do is count the number of atoms that the molecule has and the number of atoms is your subscript for the element in the M.F.
- Sun Oct 07, 2018 4:40 pm
- Forum: Significant Figures
- Topic: 200. decimal sig figs
- Replies: 5
- Views: 5487
Re: 200. decimal sig figs
200. would be 3 sig figs, but, if it were just 200 without the decimal then it would only be 1 sig fig. 200. is not the same as 200.0 because then that would be 4 sig figs since the zero does count after the decimal.
- Sun Oct 07, 2018 4:33 pm
- Forum: General Science Questions
- Topic: Periodic Table
- Replies: 16
- Views: 1664
Re: Periodic Table
When rounding the atomic weights of elements, I believe it's best to round up to three decimal places to receive a more accurate answer than rounding up a whole answer and thus misleading your calculations.