CHEMISTRY COMMUNITY

Marwan Masri 3B

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.

Marwan Masri 3B

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+.

Marwan Masri 3B

The test will probably cover all topics evenly, but some questions will often have you apply multiple concepts.

Marwan Masri 3B

Transition metals have several free electrons in their outer shell that are free to react with other elements to form bonds.

Marwan Masri 3B

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.

Marwan Masri 3B

The final covers everything on the syllabus. There's a link for the final exam and the review sessions on the website.

Marwan Masri 3B

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.

Marwan Masri 3B

It doesn't really matter that much.

Marwan Masri 3B

Dr. Lavelle recommended taking 14BL after 14A and 14B.

Marwan Masri 3B

longer bond = weaker bond
shorter bond = stronger bond

Marwan Masri 3B

The farther two elements are on the periodic table, the more electronegativity difference between them.

Marwan Masri 3B

The grade for the discussion will be posted at the end of the quarter.

Marwan Masri 3B

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.

Marwan Masri 3B

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).

Marwan Masri 3B

Larger atomic radii lead to more effective shielding of electrons , which means less electrostatic attraction. This leads to a weaker bond.

Marwan Masri 3B

Yeah we won't be needing a blue book.

Marwan Masri 3B

I'd say use the homework problems as a guide on what you need to need and what you don't.

Marwan Masri 3B

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.

Marwan Masri 3B

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.

Marwan Masri 3B

It's Sunday of every week.

Marwan Masri 3B

yeah, you will have the constants and general equations needed to solve the problems on the front page of every test.

Marwan Masri 3B

just to make sure, 1A, 1B and 1D are the only sections from the Quantum World included in the test right?

Marwan Masri 3B

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.

Marwan Masri 3B

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.

Marwan Masri 3B

You can still submit homework problems from the Quantum section next week.

Marwan Masri 3B

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.

Marwan Masri 3B

You can use either L or mL as long as you are consistent with the units throughout your calculations.

Marwan Masri 3B

Yes, you can submit your homework with problems from the review of chemistry section.

Marwan Masri 3B

The modules are not graded; you can redo them as many times as you want. So no, there is no date to complete them.

Marwan Masri 3B

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?

Marwan Masri 3B

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

CHEMISTRY COMMUNITY

Search found 31 matches

Re: TEST 3

Re: pH on final

Re: Final Topics

Re: Transition metal oxidation states

Re: HF

Re: Final

Re: Why do we balance chemical equations?

Re: Drawing Structures on Test

Re: 14B and 14BL finals

Re: Bond Length

Re: Is it best to memorize electronegativity?

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

Re: Electronegativity values

Re: Equations for Light Only

Re: Larger to weaker bond correlation

Re: Blue Book Midterm

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

Re: Questions on Midterm

Re: Meaning of Z

Re: ChemCommunity posting

Re: Constants and Equations

required reading for the test

Re: Do I have to memorize the spectrum?

Re: knowing how many sig figs to use

Re: Homework Week 4

Re: Limiting Reagent

Re: Finding the volume of stock solution to dilute

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

Re: Homework Questions [ENDORSED]

Homework Problems

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