CHEMISTRY COMMUNITY

Massimo_Capozza_1G

Chem_Mod wrote:Always look at the standard reduction half reactions and select two that apply to your redox reaction.

If it is acidic conditions then balance using H⁺ and H₂O.

If it is basic conditions then balance using ^-OH and H₂O.

Do we just assume this when doing these types of problems?

Massimo_Capozza_1G

Yeah all I gotta say is midterm 2 was a tuff go

Massimo_Capozza_1G

Never really got into poetry myself. Can anyone recommend something for a beginner?

Massimo_Capozza_1G

Yes include everything but H2O and electrons!

Massimo_Capozza_1G

When E is negative, deltaG is positive and when E is positive deltaG is negative

Massimo_Capozza_1G

I am taking 14BL in the spring and will be taking 14C in the fall

Massimo_Capozza_1G

I am also very confused by this. Does anyone have a good video that helps explain this concept

Massimo_Capozza_1G

What's the dullest element? Bohrium!

Massimo_Capozza_1G

They essentially do the same thing, the only difference is that the integrated rate law uses time while the differential rate law uses concentration

Massimo_Capozza_1G

Just started watching Schitt's Creek and it's hilarious!

Massimo_Capozza_1G

The only way k can change is by a change in temperature

Massimo_Capozza_1G

I would expect them to be out by Friday at the latest this week

Massimo_Capozza_1G

I would take 14BL next after 14B

Massimo_Capozza_1G

No energy will always be lost in some form to the surroundings

Massimo_Capozza_1G

So the larger the molecule, the more complex it is and in turn the higher the enthalpy?

Massimo_Capozza_1G

If energy or "work" is released from the system, it is an exothermic process, but if energy or work is put into the system then it is endothermic

Massimo_Capozza_1G

Does anyone have a note sheet of all the equations we should know and use for this midterm?

Massimo_Capozza_1G

Will we get an equation sheet with all the necessary equations on it for this midterm?

Massimo_Capozza_1G

What is the date and time of midterm 2?

Massimo_Capozza_1G

Isothermal is reversible because the temp. stays constant!

Massimo_Capozza_1G

This equation only works for reversible reactions because temperature has to be constant!

Massimo_Capozza_1G

I think doing the textbook problems are the best way to review!

Massimo_Capozza_1G

I would say having a job, and school is a lot of work but definitely worth it in the long run, but remember we are in college! Make sure not to overwork yourself and find time to relax and have fun!

Massimo_Capozza_1G

Yes you can go to any TAs office hours as long as the time works for you

Massimo_Capozza_1G

I think they all mean the same thing! The different names are interchangeable but mean the same thing.

Massimo_Capozza_1G

You definitely aren't alone! I am also struggling with some of the concepts this quarter. I need to find a better way to study and learn the information.

Massimo_Capozza_1G

It only affects the gas reaction. Solid and liquids aren't really affected because their volume is independent of pressure, I think.

Massimo_Capozza_1G

I just think of exothermic (exo) and an explosion of energy while endothermic (end) is taking in energy.

Massimo_Capozza_1G

Bonds are broken in a solid and the system is gaining enthalpy, therefore you need an energy input

Massimo_Capozza_1G

Yeah, just log on to CCLE through a separate device, and under the midterm 1 section, there are the links for the TA zoom proctoring.

Massimo_Capozza_1G

But is it also applicable to aqueous solutions?

Massimo_Capozza_1G

Is the reaction quotient only applicable to gases and not solids/liquids?

Massimo_Capozza_1G

can someone please explain part c more?

Massimo_Capozza_1G

For part c, K = (partial pressure of X)^2/(partial pressure of X2) You find the partial pressure of X by using the formula listed above, (12 molecules/17 molecules)x0.10 bar= 0.071 The partial pressure of X2 is (5 molecules/17 molecules)x0.10 bar= 0.030 K= (0.071)^2/(0.030) = 0.017 Where did you ge...

Massimo_Capozza_1G

Adding an inert gas doesn't mess with the reactions already happening because they are not chemically reactive; however, if you change the pressure through compression/decompression, the equilibrium will shift.

Massimo_Capozza_1G

The p in pKW stands for -log so just base the equation off that

Massimo_Capozza_1G

Yes, I believe you determine what kind of reaction it is based on the final energy value compared to the original.

Massimo_Capozza_1G

Do we get a equation sheet for the test?

Massimo_Capozza_1G

Yes, state properties only rely on the initial and final values. It's not about how you get there, but rather how you started and where you ended.

Massimo_Capozza_1G

Mari Williams 1K wrote:Are the different values of R given on our equation sheet, or is there one standard one we should memorize to use?

I'm pretty sure they are both given on the equation sheet.

Massimo_Capozza_1G

I don't trust atoms...I heard they make up everything

Massimo_Capozza_1G

Does anyone else have a problem when logging into Chemistry Community where you have to re-register each time you sign-in? I haven't had that issue so far, maybe you could click the "Remember me" option when you log in? I tried doing this and I keep getting the same message. I'll have to ...

Massimo_Capozza_1G

so the inverse is just reactants over products?

Massimo_Capozza_1G

Working out is a great way to exercise and help clear your mind!

Massimo_Capozza_1G

Don't you calculate Q and K the same way? Q is just at any point in the reaction, and K is at equilibrium?

Massimo_Capozza_1G

So the only real difference when using an ICE table for partial pressure compared to moles is the units? The process is essentially the same for both is what I'm seeing.

Massimo_Capozza_1G

Will we have to calculate a K value in a problem when temperature changes?

Massimo_Capozza_1G

So we treat inert gases like water in an aqueous reaction?

Massimo_Capozza_1G

So all we have to know this quarter is Ideal gases and their laws?

Massimo_Capozza_1G

Does anyone else have a problem when logging into Chemistry Community where you have to re-register each time you sign-in?

Massimo_Capozza_1G

I'm assuming we won't have to do any calculations, but I would definitely review orbitals and their shapes.

Massimo_Capozza_1G

I've been looking for a good study guide. Thank you so much!

Massimo_Capozza_1G

That's how I've been comprehending it! I usually think of neutralization reactions between strong acids and strong bases in this formula: Acid + Base -> Salt + Water. It makes sense that strong acids and strong bases would produce water because all the strong bases have OH and the strong acids have...

Massimo_Capozza_1G

pKa is basically just the equation used to figure out the pH of a solution.

pKa=-log(Ka)

Massimo_Capozza_1G

Another way you can determine the difference between an acid and a base is by using the Lewis definition. A Lewis acid accepts a pair of electrons. A Lewis base donates a pair of electrons.

Massimo_Capozza_1G

I was wondering the same thing? Will we be given a sheet for these names?

Massimo_Capozza_1G

No problem! However, on a side note, does anyone have trouble when logging in to the chemistry community web page? When I log in, it always says that my account isn't created, so I have to keep registering under the same alias. Does anyone else have the same problem?

Massimo_Capozza_1G

I forget how you can determine which bonds are which. Does anyone have a good explanation for this concept?

Massimo_Capozza_1G

I'm also completely lost on this topic. Does anyone have a good video to help explain this concept?

Massimo_Capozza_1G

The orditals will fill f<d<p<s tho when your get to higher number of electrons/orbitals depending on the n

Massimo_Capozza_1G

Check Lavelle's email he sent out on 9/25/20 and it should be there!

Massimo_Capozza_1G

Hi if found this image very helpful to study periodic trends

https://www.thoughtco.com/chart-of-periodic-table-trends-608792

Massimo_Capozza_1G

Hi I found this website very useful to study molecular geometry

http://intro.chem.okstate.edu/1314F00/Lecture/Chapter10/VSEPR.html

Massimo_Capozza_1G

Just like there are cations and anions, is there an opposite to ligands?

Massimo_Capozza_1G

Hi I found this really good website to study the VSEPR chart.

http://intro.chem.okstate.edu/1314F00/Lecture/Chapter10/VSEPR.html

Massimo_Capozza_1G

Yes, you're completely correct in that size contributes a lot to how strong a bond is. Larger radii means larger distance between nuclei, which creates a bond that is easier to break. Also, bond order is extremely important in determining bond strength. Triple bonds are a lot stronger than double b...

Massimo_Capozza_1G

America Alvarado wrote:So are the oxidation numbers usually given? or are we suppose to know that Oxygen has an oxidation number of -2?

I am also confused about this. Will we be given the oxidation numbers, or do we have to memorize some of them?

Massimo_Capozza_1G

I think those are right, and I'd also assume we have to memorize them for the final but I'm not completely sure.

Massimo_Capozza_1G

I think it depends heavily on the electronegativity. Electronegativity increases from left to right of the table and increases going up the table. I would use this rule of thumb to help figure these problems out.

Massimo_Capozza_1G

Is this equation on midterm 2 also?

Massimo_Capozza_1G

What's the difference between dipole-dipole and dipole-induced dipole?

Massimo_Capozza_1G

The energy required to break a bond comes down to its stability. A single bond is less stable than a double bond; a double bond is less stable than a triple bond, and so on. Electrons are more restricted when there are more bonds present. Therefore, it will require more energy to break those bonds.

Massimo_Capozza_1G

I would say one of the best things you can do to rest your mind and body is take a quick 30-45 min power nap. Try not to sleep any longer because you will feel tired and drowsy. I take naps almost every day, and they really help.

Massimo_Capozza_1G

Will we be provided any more helpful sheets like the equation sheet and periodic table?

Massimo_Capozza_1G

I think everyone gets test anxiety. I was super anxious for the last midterm and studied non-stop because I was anxious about my grade. In reality, however, the test wasn't as bad as I thought it was gonna be. While taking the exam, I played some of my favorite music in the background to help keep m...

Massimo_Capozza_1G

I'd say one of the easiest ways to remember which orbitals have the highest energy is by remembering the electron configuration chart with arrows. Basically, the energy increases as you move down the arrows.

Massimo_Capozza_1G

I think it's because the overall energy of a molecule is less. After all, its electrons are occupied in greater volumes. Basically, the electrons are more equally shared in a resonance structure; therefore, it has less energy. That was my understanding of resonance structures.

Massimo_Capozza_1G

If it doesn't fit in our schedule can we still take 14B spring semester or do we have to wait?

Massimo_Capozza_1G

I think the easiest way to understand this concept is by remembering the electron configuration chart. I suggest practice writing this chart down repeatedly; then, once you have it memorized, you can write it down during the test.

Massimo_Capozza_1G

Should we remeber these values, or will we be given what they correspond to?

Massimo_Capozza_1G

Ion ion interactions are stronger because ions are fully charged. An example is NaCl, Na has a full +1 charge, and Cl has a full -1 charge. Ions are fully charged because the cation loses its electrons, and the anion gains electrons. These large and opposite charge values create a big attraction. T...

Massimo_Capozza_1G

Is there 12 multiple choice and only 1 short answer with several parts?

Massimo_Capozza_1G

You can't use the uncertainty equation to find mass or velocity, correct? Do you have to use wavelength=h/p?

Massimo_Capozza_1G

n2 represents the excited state the electron is in, while n1 represents the energy level that the electron returns to. n2 is always greater than n1. I may be wrong, but that's the way I think about the Rydberg Equation.

Massimo_Capozza_1G

tamara masri_3D wrote:Hello! I think someone asked this in one of Professor Lavelle's office hours and he said we're not expected to know the nomenclature stuff yet. I don't think it will be on the first midterm.

Thanks!
So basically, all named molecules will be paired with their appropriate molecular formulas?

Massimo_Capozza_1G

For question F3 in the textbook, it asks what the formula for nitric acid is. Will we have to memorize what atoms are present in certain molecules, or are we going to be tested on our ability to right an empirical/molecular formula based on a molecule's name? F3 a) Write the formula for nitric acid....

Massimo_Capozza_1G

For question F3 in the textbook, it asks what the formula for nitric acid is. Will we have to memorize what atoms are present in certain molecules, or are we going to be tested on our ability to right an empirical/molecular formula based on a molecule's name? F3 a) Write the formula for nitric acid....

Massimo_Capozza_1G

Does it matter which equation we use on the midterm? Since they are related, you can use either equation to answer certain problems, but is Dr. Lavelle picky on which one we use on tests?

Massimo_Capozza_1G

I think E=mc 2 tries to describe the relationship between mass and energy. Basically, what einsteins equation is saying is that mass (matter) and energy are interchangeable, and they are the same thing. On the other side of things, the basic equation KE=1/2mv 2 is just telling you the kinetic energy...

Massimo_Capozza_1G

This is a general question on the course; I just wasn't sure where to ask.

Will we be given an equation and mathematical constant sheet for the midterm and final exams, or should I remember all the equations and constants we have learned in these units so far?

Massimo_Capozza_1G

When talking about the standing circular wave model, does this model show the general "path" of the electron as it circles the atom's nucleus? I understand that electrons have wave-like properties, but it is also a physical particle, so does the circular wave model describe its orbit?

Massimo_Capozza_1G

I think Amazon has the best prices for webcams. I was able to buy a decent webcam for about $17.48 after tax with free shipping 2-day shipping through Amazon Prime. I will attach a link to the webcam below. https://www.amazon.com/gp/product/B087C7C17P/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&p...

Massimo_Capozza_1G

I forget how you determine what the best number of sig figs to round to at the end of a question is, based on the numbers you are given. Can anyone help clarify this for me?

Massimo_Capozza_1G

Can an atom only admit three different and unique frequencies of light when an electron is excited and falls back to lower energy levels (1 for each series; Lyman, Balmer, and UV?)

Massimo_Capozza_1G

When would this equation be applicable, or in what type of question would we use this formula?

Massimo_Capozza_1G

Does anyone have a video that will summarize the atomic spectra. I am very lost on this topic.

Massimo_Capozza_1G

Does anyone have a good video that summarises the photoelectric spectrum?

Massimo_Capozza_1G

I have a question on the textbook questions themselves. Where can we find which problems to do, and are they collected for a grade? If so where do we submit our answers?

Massimo_Capozza_1G

Does anyone know what place we should round the final percentage? I'm confident I have the right answer, but every time I plug it in the system says I got it wrong.

Massimo_Capozza_1G

What do you call a clown in jail?
A Silicon!

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