Search found 30 matches

by Brandon Sanchez 3J
Sat Dec 08, 2018 8:51 pm
Forum: Properties of Light
Topic: limiting reagents
Replies: 2
Views: 46

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%.
by Brandon Sanchez 3J
Sat Dec 08, 2018 8:49 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Exam
Replies: 22
Views: 300

Re: Final Exam

The final will be cumulative and will cover everything from the syllabus.
by Brandon Sanchez 3J
Sat Dec 08, 2018 8:46 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: pH
Replies: 5
Views: 73

Re: pH

pH would decrease if H+ would increase since it is the main factor that determines the pH.
by Brandon Sanchez 3J
Sun Dec 02, 2018 2:42 pm
Forum: Hybridization
Topic: Hybridization Notation
Replies: 10
Views: 120

Re: Hybridization Notation

Both notations are correct but Lavelle prefers to have it placed at the end like sp3d.
by Brandon Sanchez 3J
Sun Dec 02, 2018 2:39 pm
Forum: Lewis Acids & Bases
Topic: Strong/Weak Acids & Bases
Replies: 2
Views: 33

Re: Strong/Weak Acids & Bases

The Ka values, dissociation constants, will determine how strong or weak an acid or base is.
by Brandon Sanchez 3J
Sun Dec 02, 2018 2:37 pm
Forum: Bronsted Acids & Bases
Topic: Proton "Donation"
Replies: 4
Views: 51

Re: Proton "Donation"

Yeah, a Bronsted Acid should be donating a H+ ion.
by Brandon Sanchez 3J
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: 83

Re: Hydrogen Bonding

Hydrogen bonding is an intermolecular force that bonds to N,O, F atoms and is a dipole dipole attraction as well.
by Brandon Sanchez 3J
Sat Nov 24, 2018 10:07 pm
Forum: Hybridization
Topic: Regions of electron density
Replies: 6
Views: 96

Re: Regions of electron density

Yeah regions of electron density will help you figure out the # of hybrid orbitals
by Brandon Sanchez 3J
Sat Nov 24, 2018 10:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework for week 9
Replies: 11
Views: 133

Re: Homework for week 9

You should be fine with having all 14 problems under one section as long as you have them.
by Brandon Sanchez 3J
Sat Nov 17, 2018 6:53 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Wednesday Class
Replies: 19
Views: 271

Re: Thanksgiving Wednesday Class

He announced in lecture on Friday that we were ahead of schedule so there would be no lecture next Wednesday.
by Brandon Sanchez 3J
Sat Nov 17, 2018 6:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AX3E2 Shape
Replies: 6
Views: 78

Re: AX3E2 Shape

The molecule's shape with 3 ligands and 2 lone pairs would be T-shaped.
by Brandon Sanchez 3J
Sat Nov 17, 2018 6:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 3
Replies: 19
Views: 231

Re: Test 3

You should memorize the table so it can help a ton when you're doing the test.
by Brandon Sanchez 3J
Sat Nov 10, 2018 5:59 pm
Forum: Balancing Chemical Reactions
Topic: Combustion Equation
Replies: 8
Views: 291

Re: Combustion Equation

Yes CO2 and H20 are always the products and O2 is one of the reactants
by Brandon Sanchez 3J
Sat Nov 10, 2018 5:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Planar
Replies: 8
Views: 72

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.
by Brandon Sanchez 3J
Sat Nov 03, 2018 2:04 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: f- orbital
Replies: 3
Views: 67

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.
by Brandon Sanchez 3J
Sat Nov 03, 2018 2:02 am
Forum: Lewis Structures
Topic: How to decide central atom?
Replies: 6
Views: 76

Re: How to decide central atom?

The central atom should be based on the lowest ionization energy and electronegativity.
by Brandon Sanchez 3J
Sat Nov 03, 2018 1:50 am
Forum: Lewis Structures
Topic: Formal Charges
Replies: 2
Views: 58

Re: Formal Charges

The location of the outside atoms should not matter.
by Brandon Sanchez 3J
Sun Oct 28, 2018 12:52 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 12
Views: 194

Re: Speed of Light

Nothing could be faster than the speed of light.
by Brandon Sanchez 3J
Sun Oct 28, 2018 12:49 pm
Forum: Ionic & Covalent Bonds
Topic: Bond
Replies: 9
Views: 131

Re: Bond

They're hardly mentioned and rare so we would only have to be informed of the single, double, and triple bonds.
by Brandon Sanchez 3J
Sun Oct 28, 2018 12:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations Full or Abbreviated
Replies: 2
Views: 21

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.
by Brandon Sanchez 3J
Sat Oct 20, 2018 10:34 pm
Forum: Photoelectric Effect
Topic: units
Replies: 12
Views: 129

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.
by Brandon Sanchez 3J
Sat Oct 20, 2018 10:31 pm
Forum: Properties of Light
Topic: Grades
Replies: 7
Views: 85

Re: Grades

Grades should be on CCLE or MyUCLA
by Brandon Sanchez 3J
Sat Oct 20, 2018 10:29 pm
Forum: Student Social/Study Group
Topic: Test #2
Replies: 6
Views: 75

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.
by Brandon Sanchez 3J
Sat Oct 13, 2018 11:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Writing in Pen
Replies: 13
Views: 234

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
by Brandon Sanchez 3J
Sat Oct 13, 2018 11:26 pm
Forum: Einstein Equation
Topic: Numbers to memorize
Replies: 22
Views: 317

Re: Numbers to memorize

I think they give us a sheet that has all the constants and equations along with the test so no.
by Brandon Sanchez 3J
Sat Oct 13, 2018 11:18 pm
Forum: Empirical & Molecular Formulas
Topic: Going from empirical to Molecular formula
Replies: 14
Views: 309

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.
by Brandon Sanchez 3J
Sun Oct 07, 2018 4:43 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular Formula
Replies: 12
Views: 99

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.
by Brandon Sanchez 3J
Sun Oct 07, 2018 4:40 pm
Forum: Significant Figures
Topic: 200. decimal sig figs
Replies: 5
Views: 144

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.
by Brandon Sanchez 3J
Sun Oct 07, 2018 4:33 pm
Forum: General Science Questions
Topic: Periodic Table
Replies: 16
Views: 351

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.

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