Search found 31 matches

by Marwan Masri 3B
Fri Dec 07, 2018 3:30 pm
Forum: Formal Charge and Oxidation Numbers
Topic: TEST 3
Replies: 4
Views: 217

Re: TEST 3

You don't need the formula; count how many electrons are associated with an element and subtract the number of electrons from the number of valence electrons of that element.
by Marwan Masri 3B
Fri Dec 07, 2018 3:23 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH on final
Replies: 5
Views: 464

Re: pH on final

You might be given a certain PH and asked to find the concentration or it could be the other way around. You might also be asked about POH which is similar except it involves the concentration of OH- instead of H+.
by Marwan Masri 3B
Fri Dec 07, 2018 3:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Topics
Replies: 3
Views: 130

Re: Final Topics

The test will probably cover all topics evenly, but some questions will often have you apply multiple concepts.
by Marwan Masri 3B
Fri Nov 30, 2018 10:46 am
Forum: Naming
Topic: Transition metal oxidation states
Replies: 3
Views: 52

Re: Transition metal oxidation states

Transition metals have several free electrons in their outer shell that are free to react with other elements to form bonds.
by Marwan Masri 3B
Fri Nov 30, 2018 10:39 am
Forum: Lewis Acids & Bases
Topic: HF
Replies: 5
Views: 117

Re: HF

The strength of an acid depends on how it dissociates in water. The bond between hydrogen and fluorine is strong so there isn't a high concentration of H3O+ ions, meaning it doesn't dissociate as much as other strong acids would.
by Marwan Masri 3B
Fri Nov 30, 2018 10:35 am
Forum: Administrative Questions and Class Announcements
Topic: Final
Replies: 11
Views: 307

Re: Final

The final covers everything on the syllabus. There's a link for the final exam and the review sessions on the website.
by Marwan Masri 3B
Fri Nov 23, 2018 9:39 am
Forum: Balancing Chemical Reactions
Topic: Why do we balance chemical equations?
Replies: 12
Views: 402

Re: Why do we balance chemical equations?

if the number of atoms of each element is not the same on both the reactants and the products side, the law of conservation of mass would be violated.
by Marwan Masri 3B
Fri Nov 23, 2018 9:35 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing Structures on Test
Replies: 11
Views: 159

Re: Drawing Structures on Test

It doesn't really matter that much.
by Marwan Masri 3B
Fri Nov 23, 2018 9:33 am
Forum: Administrative Questions and Class Announcements
Topic: 14B and 14BL finals
Replies: 3
Views: 129

Re: 14B and 14BL finals

Dr. Lavelle recommended taking 14BL after 14A and 14B.
by Marwan Masri 3B
Thu Nov 15, 2018 11:36 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 6
Views: 132

Re: Bond Length

longer bond = weaker bond
shorter bond = stronger bond
by Marwan Masri 3B
Thu Nov 15, 2018 11:34 pm
Forum: Electronegativity
Topic: Is it best to memorize electronegativity?
Replies: 8
Views: 300

Re: Is it best to memorize electronegativity?

The farther two elements are on the periodic table, the more electronegativity difference between them.
by Marwan Masri 3B
Thu Nov 15, 2018 11:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Discussion posts grading (Anyone have a grade for this yet?)
Replies: 3
Views: 133

Re: Discussion posts grading (Anyone have a grade for this yet?)

The grade for the discussion will be posted at the end of the quarter.
by Marwan Masri 3B
Fri Nov 09, 2018 12:38 am
Forum: Ionic & Covalent Bonds
Topic: Electronegativity values
Replies: 4
Views: 91

Re: Electronegativity values

yes, you'll be provided with the electronegativities needed to answer such a question, eventhough you could probably make a pretty accurate guess based on whether the elements are metals/nonmetals and such.
by Marwan Masri 3B
Fri Nov 09, 2018 12:36 am
Forum: Einstein Equation
Topic: Equations for Light Only
Replies: 3
Views: 320

Re: Equations for Light Only

You could use E=hv and E=hc/wavelength for light, but de Broglie's equation only applies to particles (even though it was derived from equations for light).
by Marwan Masri 3B
Fri Nov 09, 2018 12:34 am
Forum: Bond Lengths & Energies
Topic: Larger to weaker bond correlation
Replies: 3
Views: 96

Re: Larger to weaker bond correlation

Larger atomic radii lead to more effective shielding of electrons , which means less electrostatic attraction. This leads to a weaker bond.
by Marwan Masri 3B
Fri Nov 02, 2018 4:16 am
Forum: Administrative Questions and Class Announcements
Topic: Blue Book Midterm
Replies: 4
Views: 138

Re: Blue Book Midterm

Yeah we won't be needing a blue book.
by Marwan Masri 3B
Fri Nov 02, 2018 4:14 am
Forum: Student Social/Study Group
Topic: Midterm- what do we need to know about atomic orbitals
Replies: 2
Views: 132

Re: Midterm- what do we need to know about atomic orbitals

I'd say use the homework problems as a guide on what you need to need and what you don't.
by Marwan Masri 3B
Fri Nov 02, 2018 4:12 am
Forum: Administrative Questions and Class Announcements
Topic: Questions on Midterm
Replies: 4
Views: 119

Re: Questions on Midterm

Dr. Lavelle said at least one question from the homework would show up on the midterm, but i don't think that means that the midterm would be restricted to homework problems. Also, test bank does not have previous exams.
by Marwan Masri 3B
Thu Oct 25, 2018 10:56 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Meaning of Z
Replies: 5
Views: 129

Re: Meaning of Z

Yes, Z refers to atomic number. That's why the textbook sometimes says that the nucleus of an atom of x element has +Ze charge because the atomic number is also the number of protons in the nucleus.
by Marwan Masri 3B
Thu Oct 25, 2018 10:51 pm
Forum: Student Social/Study Group
Topic: ChemCommunity posting
Replies: 4
Views: 206

Re: ChemCommunity posting

It's Sunday of every week.
by Marwan Masri 3B
Thu Oct 25, 2018 10:50 pm
Forum: Administrative Questions and Class Announcements
Topic: Constants and Equations
Replies: 2
Views: 106

Re: Constants and Equations

yeah, you will have the constants and general equations needed to solve the problems on the front page of every test.
by Marwan Masri 3B
Mon Oct 22, 2018 9:04 pm
Forum: Administrative Questions and Class Announcements
Topic: required reading for the test
Replies: 1
Views: 125

required reading for the test

just to make sure, 1A, 1B and 1D are the only sections from the Quantum World included in the test right?
by Marwan Masri 3B
Fri Oct 19, 2018 9:21 am
Forum: Properties of Light
Topic: Do I have to memorize the spectrum?
Replies: 20
Views: 337

Re: Do I have to memorize the spectrum?

You should know that visible light ranges from 400nm(violet) to 700nm(red). You should also be familiar with the order of the wavelengths of the electromagentic radiation on the spectrum.
by Marwan Masri 3B
Fri Oct 19, 2018 9:18 am
Forum: Significant Figures
Topic: knowing how many sig figs to use
Replies: 17
Views: 560

Re: knowing how many sig figs to use

Lia Inadomi 1I wrote:What does it mean when there is a period after a number but no decimals after the period? For example, 50. g of something. Is that still 2 sigfigs?


yeah that's two sig figs.
by Marwan Masri 3B
Fri Oct 19, 2018 9:15 am
Forum: Administrative Questions and Class Announcements
Topic: Homework Week 4
Replies: 4
Views: 92

Re: Homework Week 4

You can still submit homework problems from the Quantum section next week.
by Marwan Masri 3B
Thu Oct 11, 2018 12:18 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reagent
Replies: 10
Views: 436

Re: Limiting Reagent

Alternatively, you can calculate how much of the product would each reactant produce; the reactant that produces the least moles of product would be the limiting reactant.
by Marwan Masri 3B
Thu Oct 11, 2018 12:10 pm
Forum: Molarity, Solutions, Dilutions
Topic: Finding the volume of stock solution to dilute
Replies: 12
Views: 395

Re: Finding the volume of stock solution to dilute

You can use either L or mL as long as you are consistent with the units throughout your calculations.
by Marwan Masri 3B
Thu Oct 11, 2018 12:05 pm
Forum: Administrative Questions and Class Announcements
Topic: So can we do problems from Review of Chemistry for week 2 homework?
Replies: 4
Views: 79

Re: So can we do problems from Review of Chemistry for week 2 homework?

Yes, you can submit your homework with problems from the review of chemistry section.
by Marwan Masri 3B
Thu Oct 04, 2018 3:34 pm
Forum: SI Units, Unit Conversions
Topic: Homework Questions [ENDORSED]
Replies: 14
Views: 248

Re: Homework Questions [ENDORSED]

The modules are not graded; you can redo them as many times as you want. So no, there is no date to complete them.
by Marwan Masri 3B
Thu Oct 04, 2018 3:32 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Problems
Replies: 3
Views: 81

Homework Problems

Is there any restriction as to how many questions we can answer from each section? ( only one question from E, only one from F, and so on) or can i answer any number of questions i want from any section as long as i end up submitting seven questions?
by Marwan Masri 3B
Mon Oct 01, 2018 1:47 pm
Forum: Administrative Questions and Class Announcements
Topic: Bruincast
Replies: 2
Views: 83

Bruincast

Are Dr. Lavelle's lectures recorded? if so, where do i find them?

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