CHEMISTRY COMMUNITY

JohnathanH_1H

I used the unique rate law in order to get in order to find the rates of each A,B and C.

JohnathanH_1H

When I did this question I used the formula was the 2nd order half life equation of t1/2= 1/(k[A]o). By manipulating the variables I go the equation k=1/(t1/2*[A]o). From there I plugged in the half life and the initial concentration in order to get the answer for k.

JohnathanH_1H

the half life formula is derived from the first order rate law making and further simplified to 0.693/k. which is also an equation on our constants and equations sheet!

JohnathanH_1H

I would assume like the other midterm exams scores will come out in about 2-3 days. But for sure by Friday I would.

JohnathanH_1H

That is correct and dont feel dumb, asking for reassurance is smart since it is virtually free points. And getting those points can be very helpful!

JohnathanH_1H

The final exam is going got formatted the same way as the two midterm exams.

JohnathanH_1H

Sadly I wasn't able to attend but glad to hear the event went well and everyone had fun!

JohnathanH_1H

As others have stated I do not think that Free Energy can be related to Kinetics since they stand for different things. Kinetics models the rate of the reaction and the time whereas Gibbs Free Energy deals more with the way a reaction is, ie as someone said spontaneity

JohnathanH_1H

The thing that helps me determine the order is looking at the graphs and seeing what the axes are. If A is directly graphed against time it is zero order. If it is 1/[A] vs time then it is first order. If it is ln[A] vs time it is second order

JohnathanH_1H

When deciding on which scale to use I usually look at the information that is given. Usually the question will state whether or not the answer or if you need to convert from one temperature to the other. The most important thing is to pay attention to the units that are being used and to make sure t...

JohnathanH_1H

To help with my test anxiety I try to routine my study time. I take my time and alot for small breaks and even times for a larger meal break. By setting aside some time to have a little leisure during my studying helps me remember more and stay focused and kind of avoid feeling anxious about the upc...

JohnathanH_1H

From what I got k stands for the reaction constant.

JohnathanH_1H

Usually, when I am checking how any posts I have posted I look at the number under "your posts" after clicking "quick links" at the top left. However, I noticed after I post a comment and it shows how many posts I have the number that it says is more than the number under the &qu...

JohnathanH_1H

It also took me a while I did see above that Lavelle did give tips. They should help but I do think that it will be a lengthy process.

JohnathanH_1H

Idk what question elements are in your reaction but for me I had MnO4- and S2+ going into S and MnO2. First I separated them into their cathode and anode. Making S2- the anode and MnO4- the cathode. After balancing the electrons you also have to take note that MnO4 loses two Oxygens and in order to ...

JohnathanH_1H

They are the same thing.

JohnathanH_1H

Having a negative Delta G indicates that the reaction is spontaneous. Meaning that the reaction is exergonic and that the energy of the reactants is greater than the energy of the products.

JohnathanH_1H

Yes delta U can be 0 because it just means that the initial and final internal energies are the equal.

JohnathanH_1H

A closed system is a system that is cut off from its surroundings meaning the thing that energy is able to transfer but not matter

JohnathanH_1H

In order to know which R constant you have to look at the units being used in the information given

JohnathanH_1H

K is the value of the equation at equilibrium whereas Q is the change as the system approaches equilibrium.

JohnathanH_1H

I believe you have to talk to your TAs in order to actually sit and review your midterm one answers.

JohnathanH_1H

Monoprotic acids are acids that can only donate one proton which means 1 H atom

JohnathanH_1H

When K is less than 10^-3 then we can assume that K is negligible to change in concentration/pressure.

JohnathanH_1H

Both Ponyo and A Silent Voice are movies that I continue to watch as a comfort. They both are anime movies and I dont know if that is your style or not but I do recommend them.

JohnathanH_1H

I want to take 14bL next quarter but depending on it schedule conflicts I want to avoid starting 14c, ochem, then going to summer and forgetting important ochem material.

JohnathanH_1H

It depends on the TA if they will allow for make-up posts or not.

JohnathanH_1H

Personally, I enjoy sushi a lot and tend to crave that and pasta most of the time.

JohnathanH_1H

I like to listen to Keshi, Rex Orange County, and a lot of lo-fi artists while I study

JohnathanH_1H

According to Lavelle's email midterm 1 will cover outlines 1-3.

JohnathanH_1H

Only the Week 1 Achieve assignment is worth points, whereas the other assignments are there for practice purposes.

JohnathanH_1H

Yes according to the syllabus all you need to get is 50% of the points in order to pass the class

JohnathanH_1H

Like the others have stated M, molarity, is the same as mols/L^-1.

JohnathanH_1H

Yeah according to the email the 10 am lecture is the only in-person lecture and the lecture recording will be posted roughly an hour or so after, but should not be later than 12 I believe.

JohnathanH_1H

To choose which R constant to use you have to look at the units asked/used so in the question.

JohnathanH_1H

Enthalpy is the total energy in a system whereas heat is the energy transferred.

JohnathanH_1H

Endothermic reactions need heat making heat an input in the equation where endothermic reactions release heat making it an output in the equation

JohnathanH_1H

The way I think of hess's law is that it is similar to a math problem with a bunch of variables. You need to arrange the equations in a way that the extra molecules are able to cross out, while still keeping the chemical equation the same, in order to create the desired chemical equation.

JohnathanH_1H

In Cv since there is no work done with this equation Cv is smaller than the Cp. Also with Cp there is expansion due to the work which makes Cp bigger than Cv

JohnathanH_1H

Right now Ive been thinking about switching my major. Currently I am a bio major and I chose to be a bio major because it interested me the most. But after looking at the major requirements I realized that a lot of upper-division courses that I would need to take do not interest me that much and so ...

JohnathanH_1H

Usually when I am burntout I take time for myself. Like though you maybe burnt stressed out in a stressful time, taking a day for yourself helps you reset, so then you can just relax. And the break try to do a little bit at a time and not tackle everything at once. Thats usually what helps me.

JohnathanH_1H

Work has definitely been more of a blessing rather than a hindrance for me. I have a problem with time management and procrastination, but with work it kind of forced me to make a schedule for me to follow and keep with. I work about 12-13 hours a week and at times it is stressful but also it is nic...

JohnathanH_1H

This may not work for everyone but usually when I have a hard time focusing, I put in headphones and either drink coffee or an energy drink and it usually helps me focus on what tasks I have at hand.

JohnathanH_1H

Kudasaibeats on Spotify has a lot of lofibeats that I like to listen to when I study.

JohnathanH_1H

With studying for anything I find Youtube videos to be one of the best methods. They usually have examples to follow and overall go into pretty good depth on whatever subject you could be learning. I also find group studying to also help. When I say group study I mean each person focuses on one port...

JohnathanH_1H

Thank you for the link

asheagg3I wrote:This is the group me link that I have for chem 14b:
https://groupme.com/join_group/83905907/SUP7995s

JohnathanH_1H

One arrow in a chemical reaction, the arrow is left to right, means that the equation is not reversible. Meaning that the products do not turn back into the reactants. Whereas the double arrow represents reversible meaning the products have the ability to become reactants.

JohnathanH_1H

To know when things are being subtracted or added you look at the chemical equation. The reactions are subtracted and the products are added, when using the ICE Box

JohnathanH_1H

K is the term used when a reaction is at equilibrium whereas Q is the term used as the reaction tries to reach equilibrium.

JohnathanH_1H

you don't have to make a new account, just update your username you your discussion time

JohnathanH_1H

I missed it to but a lot of people have assured me that it is fine and that depending on the person it is better to the lab after taking 14b

JohnathanH_1H

VSEPR stands for Valence Shell Electron Pair Repulsion and is the theory we use in order to determine the shape of the molecule through the amount of lone pairs and pairs are present

JohnathanH_1H

Congrats!! I also think that all the studying that I did and that everyone else did really helped improve each of our test scores!

JohnathanH_1H

To study I am doing the practice problems that he gave us, rereading my notes and watching as many YouTube videos as I can because they often have problems to practice while watching it

JohnathanH_1H

if i need to change one of my discussions bc of a time conflict will I b able to change it later or should I try to waitlist for another discussion?

JohnathanH_1H

That would be correct take HF for example it seems like it would be the strongest acid but it is not since the bond between H and F are much stronger than HBr for example which has a weaker bond

JohnathanH_1H

For the homework problems and I believe most of the naming we do will be using the di, tri, tetra, penta, hexa, prefixes. The other set is used after the first set is used when multiple ligands are present

JohnathanH_1H

The transition metal come last in naming, when you are naming what is in the brackets of the coordination compound.

JohnathanH_1H

That's quite an interesting perspective to take. Constantly throughout high school, I would always make "silly mistakes" on math problems, and I realized that the score I got wasnt because I didn't know what I was doing but more of that I just needed to slow down and take my time.

JohnathanH_1H

Honestly, I haven't figured out how to deal with it either. Its week 10 now and Im so tired but this break was kinda nice to just kinda get away from school and enjoy myself for a bit. So I recommend taking a break for a bit to recenter yourself.

JohnathanH_1H

you need to put the roman numeral for TM complexes because metals can have multiple oxidation numbers

JohnathanH_1H

As the atom get bigger the more the polarizability increases

JohnathanH_1H

The way I find the oxidation for TM is I look at the overall charge of the compound then use the oxidation numbers of the other atoms in the compound to help determine what the TM needs to be in order to reach the overall charge

JohnathanH_1H

My favorite food is definitely sashimi. I have a lot of favorite desserts such as cream puffs, tarts, and cakes.

JohnathanH_1H

My favorite food is definitely sashimi. I have a lot of favorite desserts such as cream puffs, tarts, and cakes.

JohnathanH_1H

Well as a freshman now on campus I am looking forward to what all the school has to offer. I miss my family a lot though so Im looking forward to the upcoming breaks

JohnathanH_1H

The best thing I do to calm down is play music. It helps in almost every situation. Like play either more upbeat music to just get you in a better mood or sometimes playing calm music can help, I would try both and see what works best for you.

JohnathanH_1H

Out of all Chemistry YouTube videos, I am a big fan of Organic Chemistry Tutor. They have helped me a lot in chemistry and many other subjects like math and biology.

JohnathanH_1H

In the molecular shape to tell if an atom is equatorial or axial, you can view it as the vertical atoms are the axial atoms and the equatorial ones are horizontal.

JohnathanH_1H

Each element has its own set electronegativity but to help figure out which one has a greater or lesser electronegativity, just remember it increases across a period and decreases down a group.

JohnathanH_1H

Since the molecule is tetrahedral the bond angles will be less than 109.5 degrees, the exact degrees varies due to which elements are involved.

JohnathanH_1H

The difference between Square Planar and Tetrahedral is that Square Planar has 6 regions of electron density with 2 lone pairs were as tetrahedral only has 4 regions of electron density.

JohnathanH_1H

No, they do not affect in the VSEPR model. With the VSEPR model, it focuses primarily on the central atom hence the AXE formula.

JohnathanH_1H

I think the grades will be posted Monday like the other midterm if I remember correctly. Also Im pretty thankful for my job, my friends, family, and music.

JohnathanH_1H

That actually is funny. Also, what's your favorite SpongeBob character?

JohnathanH_1H

I think the grading of the posts depends on which TA you have some do it by week and some do it at the end. However I am not certain this is just what I have heard

JohnathanH_1H

The formal charge on the central atom does not need to be 0 but it is best to try to make it 0. There are many molecules like N20 which the central atom is a nitrogen has a plus 1 charge

JohnathanH_1H

Intermolecular forces happen between molecules such as dipole-dipole, dipole-induced-dipole, and such. Intramolecular forces happen inside the molecule such ionic or covalent bonding

JohnathanH_1H

Pi bonds occur in double and triple bonds. So double bonds have 1 sigma and 1 pi bond and triple bonds have 1 sigma bond an 2 pi bonds

JohnathanH_1H

elements that are after period 3, so periods 3-7 can have an expanded octet

JohnathanH_1H

Larger atoms have a lower electronegativity because the outer electrons are so much farther from the nucleus causing the nucleus to have less pull on electrons of another atom.

JohnathanH_1H

I dont know what types of shows you are into, but I do recommend inappropriate word Education on Netflix, and I have just started Euphoria which is pretty good so far

JohnathanH_1H

Other than practicing the book problems I like to watch youtube videos on the topics we are learning. And also studying with friends, and reviewing lectures, and notes. I definitely recommend watching youtube videos the most

JohnathanH_1H

today in the lecture Professor Lavelle stated that midterm two will cover material from the last midterm to the bond shapes, and material from half of the lecture on Monday.

JohnathanH_1H

Yes that is correct. The shape of the molecule does determine the bond angle. For example, trigonal planars have bond angles of 120 degrees. Bilateral pryamidals have bond angles of 90 degrees and 180 degrees.

JohnathanH_1H

The lone pairs on the oxygen atom are the cause for water to be bent in shape.

JohnathanH_1H

Covalent bonds are similar to ionic bonds in the sense that in some cases there is an unequal share of the electrons in covalent bonds that causes the electrons to be closer to one atom than the other. This unequal share is very similar to ionic bonding in the sense that in ionic bonds the electrons...

JohnathanH_1H

Covalent bonds are similar to ionic bonds in the sense that in some cases there is an unequal share of the electrons in covalent bonds that causes the electrons to be closer to one atom than the other. This unequal share is very similar to ionic bonding in the sense that in ionic bonds the electrons...

JohnathanH_1H

Radicals are compounds that have unpaired electrons. Such as CH3.

JohnathanH_1H

Im doing pretty well right now. Though I know the stress will start to pick up when I begin to study for my second round of midterms and finals that are sadly not too far away.

JohnathanH_1H

For study music, I tend to switch it up a lot depending on the time of day and the mood Im in. So if the homework or studying is not urgent or it is night time then I will tend to play Lofi music or indie pop music. But if i am in a rush and need to get it done or its morning or the afternoon I will...

JohnathanH_1H

Happy Haloween to everyone who celebrates! Today I plan on doing the stack of homework I have and then probably watch a movie tonight.

JohnathanH_1H

My TA said we should be able to bring any calculator, not a phone of course, because it is kinda hard for them to enforce a specific calculator

JohnathanH_1H

No because I am also am curious if there is a curve because I have been studying hard, but also I still feel like I might bomb the exam

JohnathanH_1H

When you melt sugar and water into invert sugar syrup, it is a hydrolysis reaction that can be sped up with catalysts such as cream of tartar or lemon juice. I never thought about it but I do make a lot of syrup so it's interesting to see the chemistry in action and I have this thread to thank for ...

JohnathanH_1H

Did anyone happen to know where if we can find some of the even problem answers in the book?

JohnathanH_1H

So Im doing some last-minute studying for the midterm and Im confused on question 1.b.9 for the quantum world. Is the rated light the total energy or is it something else?

JohnathanH_1H

In the syllabus we have the outlines for each unit. It doesn't necessarily tell us when we will get to each unit or when we will finish each unit, but at the end of each we have to submit the achieve assignments. When we get near the end of the unit till probably give a due date on achieve.

JohnathanH_1H

"c" represents the speed of light. Like someone else had stated the "vacuum" portion is just used for ideal conditions, because in different scenarios like in water the speed of light can change because water is a different medium for light to travel through.

JohnathanH_1H

hey! I usually use the masses given on the periodic table and then round later after all the computations. While I was doing achieve I usually just rounded to the hundredths place and most of the questions accepted my answers. I also believe that achieve has a range from for the correct answer to de...

Search found 102 matches