CHEMISTRY COMMUNITY

Pipiena Malafu 3J

Just a heads up, you'll have to memorize the VSEPR chart.

Pipiena Malafu 3J

Essentially, electron geometry includes lone pairs while molecular geometry excludes lone pairs in the VSEPR chart.

Pipiena Malafu 3J

To determine whether the dipoles are polar or not, you're also going to need the shape of the molecule. To double check, you could find an electronegativity chart and check to see if the difference between values surpass the nonpolar covalent point.

Pipiena Malafu 3J

For most stable structures, the more electronegative atom should typically be the one with the negative formal charge and the opposite is true for the opposite case.

Pipiena Malafu 3J

So... same chapter?

Pipiena Malafu 3J

Given that there are only 8 questions, the chances of there being a multiple choice question part is highly unlikely. So as everyone has stated, it's almost definitely gonna be a majority, if not all, free-response questions.

Pipiena Malafu 3J

As being mentioned above, radicals are unpaired electrons that can affect DNA. Thinking of this biologically, the possibility of mutations and such occurring in the DNA due to unpaired electrons is much more likely. A way to think of it is to imagine a population where there is just enough food for ...

Pipiena Malafu 3J

[Continuation of last explanation]

For this reason, I believe that the problems will inform you as to what the charges are for the transition metals, disregarding a few of the ones with fixed charges. (For anyone who feels, or is more confident, please feel free to pitch in on this matter!)

Pipiena Malafu 3J

From my understanding of transition metals, there is no set number of valence electrons for each individual atom within these metals as their electrons can be configured in a variety of ways allowing them to have a range of possible numbers for valence electrons.

Pipiena Malafu 3J

Aforementioned, the midterm covers the three main topics: Fundamentals, Chemical Bonds, and the Quantum World. So it's highly recommended to study those sections and do the review problems!

Pipiena Malafu 3J

In quick summary, in comparison to other periodic patterns, electronegativity is able to be calculated as elements have set electronegative charges.

Pipiena Malafu 3J

I would say yes, especially given that you have to be able to write electronic configurations.

Pipiena Malafu 3J

Given that there are usually the same amount of electrons (e-) as protons (p+) in an element, if you remove one electron the proton will want more an e- more and thus there more energy is generated due to the pull of p+. However, once you remove two e- but maintain the same amount of p+, now you hav...

Pipiena Malafu 3J

The 3D orbital is slightly higher in energy; visually, if you look at the periodic table, it can be seen that the 4s orbital comes before 3D.

Pipiena Malafu 3J

Orbitals that have the same value of the principal quantum number n; n form a shell. “Orbitals within a shell are divided into subshells that have the same value of the angular quantum number l. Chemists describe the shell and subshell in which an orbital belongs with a two-character code such as 2p...

Pipiena Malafu 3J

An easy way to remember that lambda is wavelength is to notice that it kind of looks like a wave in an ocean. V is for frequency and doesn’t look like a wave.

Pipiena Malafu 3J

As mentioned above, as long as you do the five questions under the specified topic then you should be fine. The sections don’t matter as much to the TAs than it does for you to have sufficient practice for the exams.

Pipiena Malafu 3J

As part of the photo electronic effect, light below a certain threshold frequency, no matter how intense, will not cause any electrons to be emitted. Light above the threshold frequency, even if it's not very intense, will always cause electrons to be emitted. This site might be resourceful: http://...

Pipiena Malafu 3J

Maya Beal Dis 1E wrote:What is the relationship between the amplitude of a wave and the frequency? Or the relationship between amplitude and wavelength? What does amplitude tell us exactly?

I believe that amplitude tells you about the intensity of light. Hope this helps!

Pipiena Malafu 3J

I typically convert everything to meters by default. However, unless the question specifies to convert measurements then I believe any SI unit should be fine as long as the answer is correct. As for angstroms, I wouldn’t worry about that measurement unless the question is relative to bond lengths or...

Pipiena Malafu 3J

To add, catalysts typically affect the speed at which reactions occur rather than affecting equilibrium states of reactions.

Pipiena Malafu 3J

Thanks for the heads up!

Pipiena Malafu 3J

I think of finding the limiting reactant as tryna make a sandwich. If you're making a peanut butter and jelly sandwich, you will need two slices of breads and one jelly jar, and one peanut butter jar. If one ingredient is limited, like a slice of bread is gone (out of 4) then you're limited to 1 san...

Pipiena Malafu 3J

Bita Ghanei 1F wrote:Will you be posting the worksheets and their answer keys weekly?

Thank you so much for making these!

I'd also like to know if you're planning on posting the worksheets weekly! Also, is it possible that you might have (or develop) a group chat to continue posting these sheets?

Pipiena Malafu 3J

Anthony Hatashita 4H wrote:Do we have to memorize equations or are we given a list of equations?

Aforementioned, no we do not. Hopefully this helps!

Pipiena Malafu 3J

Long story short, leading zeroes (or zeroes before numbers other than zero) are never significant and thus there is only one significant figure for numbers like "0.002" and such.

Pipiena Malafu 3J

The other peers above are correct. The only additional information I could give is that dimensional analysis maintains organization in that you can visually see how measurements cancel each other out. It helps to find out the measurement of a solution especially when problems become more complex.

Pipiena Malafu 3J

Here are the basic rules listed below:

1. Non-zero digits are always significant.
2. Any zeros between two significant digits are significant.
3. A final zero or trailing zeros in the decimal portion ONLY are significant.

Just remember that multiplication and addition are different processes.

Pipiena Malafu 3J

Depends on the problem and significant figures but if it were 3 SFs then there shouldn't be a need to round down.

Pipiena Malafu 3J

Has someone made a group on groupme or FB? I'd like to join.

Pipiena Malafu 3J

Thank you for the clarification, Nada! :-)

Pipiena Malafu 3J

So what does increasing the energy emitted from some light source do? Does it affect the intensity at which electrons are ejected or does it affect the number of electrons ejected? Does it do both?

Pipiena Malafu 3J

It depends - this question is fairly vague. Read the information thoroughly and figure out based off of the problem and the given information.

Pipiena Malafu 3J

Are you the eleventh element of the periodic table because you're sodium fine B-)

Pipiena Malafu 3J

Thank you!!

Pipiena Malafu 3J

So what does increasing the energy emitted from some light source do? Does it affect the intensity at which electrons are ejected or does it affect the number of electrons ejected?

Pipiena Malafu 3J

From my knowledge, Destiny is correct - the homework is due Friday in class. You'll benefit from doing homework this week even if it is not assigned in the end because Lavelle put in his syllabus that he uses homework questions on exams as an incentive to study.

Pipiena Malafu 3J

An aqueous solution is when something is able to be dissolved by water. We need to include the state of matter when writing and balancing chemical reactions as it allows us to determine the solubility of some chemical reactions.

Pipiena Malafu 3J

When finding measurements in general, we tend to approximate numbers (unless it's a definite measurement). The last digit of some measurement, in turn, becomes the least accurate as it's an approximation. Sig figs allow us to find more precise measurements of any given thing as it measures to the mo...

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