CHEMISTRY COMMUNITY

Kiana Tashakori 1D

Yes! You would just make the denominator 1.

Kiana Tashakori 1D

No, you don't have to include water because its concentration doesn't affect the rate.

Kiana Tashakori 1D

Professor Lavelle sent out an email and said that we can make up any chem community posts we missed! You just need to answer questions or make posts equivalent to the amount of points you missed (each post = 1 point).

Kiana Tashakori 1D

The rate constant can change if theres a change in temperature!

Kiana Tashakori 1D

Depending on the problem and whats given, you would use ln[A]=-kt+ln[A] if you have to find A or k at a given time. If you are just given K and a concentration, and just need to find the rate of the reaction, you can use rate = k[A].

Kiana Tashakori 1D

You could use Q to predict the direction of the reaction because if its greater than Kc, then the reaction will shift towards the reactants because this means that too much product is formed. If Q is less than Kc, then the reaction will shift towards the products since not enough is being formed.

Kiana Tashakori 1D

Yes I believe so! If you check under the grades tab on CCLE you should be able to see your score, but if you want to double check you could email your TA

Kiana Tashakori 1D

Hi! You would just use the equation t1/2= [A]0/2K to calculate the half life of a zero order reaction.

Kiana Tashakori 1D

You can find the intermediate by looking at what is in the 1st reactions products, 2nd reactions reactants, but isn't in the overall reaction. They aren't included in the rate law because they aren't products or reactants themselves.

Kiana Tashakori 1D

I think that isolated systems are just theoretical because even though we have come close (like the bomb calorimeter mentioned), we haven't found a way to completely stop exchanges from happening with the surroundings.

Kiana Tashakori 1D

I really like using a planner to split up the work I have to do. It makes it easier to manage everything and keep myself from burning out because I can complete smaller tasks over time rather than having a huge amount of work to complete at once.

Kiana Tashakori 1D

Does anyone know if Friday will just be review or if we won't have any class one Friday?

Kiana Tashakori 1D

Im a part of UCLA Campmed and Surfrider which are both great clubs to get involved in.

Kiana Tashakori 1D

Since Dr. Lavelle always plays good music before class I thought it'd be fun to make a thread of our favorite songs, so leave any song recommendations below!

Kiana Tashakori 1D

Its because we use standard conditions, and at standard conditions the potential is 0 V, so E would equal 0

Kiana Tashakori 1D

I just read Untamed by Glennon Doyle and it was pretty good!

Kiana Tashakori 1D

There are so many good food spots in Westwood! If you're looking for super casual places to go to, some staple restaurants are Cava, Ami, Tocaya, and In n Out. Also cant forget about Diddy Riese.

Kiana Tashakori 1D

The work done by a system is going to be negative because it is releasing/losing energy to its surroundings

Kiana Tashakori 1D

We should definitely compile all of the songs he uses into a playlist and post it on chem community at the end of the quarter

Kiana Tashakori 1D

Cp is used for constant pressure and Cv is used for constant volume. They're just two constants that you can find on the equation sheet were given.

Kiana Tashakori 1D

I feel like the scores for the first midterm were released fairly quickly, I'd assume midterm 2 scores should be out by some time next week

Kiana Tashakori 1D

We did it! Good luck on all your other midterms guys. Go out and do something fun, we deserve it :)

Kiana Tashakori 1D

Both sapling homework and chemistry community posts are due on Sundays at midnight

Kiana Tashakori 1D

I think for the sake of this class you can just remember that when work is done by the system it is negative because it is releasing energy, and when work is being done on the system it is positive because it is gaining energy

Kiana Tashakori 1D

When delta G is less than 0 (so when it is negative) more products will form because the forward reaction will be favored.
When delta G is greater than 0 (so when it is positive) more reactants will form

Kiana Tashakori 1D

Hi! Its hard not to feel like this with the pressure of the quarter system but I find that planning a schedule ahead of time that splits the work up into small manageable pieces helps so much. Its also super important to take care over yourself when you're feeling super overwhelmed. I like to take w...

Kiana Tashakori 1D

I'm currently looking for some easy GE's to take for the historical/social analysis requirement. If anyone has any suggestions let me know!

Kiana Tashakori 1D

Hi! I think we will be given that information on exams.

Kiana Tashakori 1D

The workload for 14BL isnt too bad! The main focus is just completing your labs/lab reports. Theres a midterm and a final as well. I think the class is just a bit time consuming

Kiana Tashakori 1D

This is so helpful! Do you feel like any of these tips help more than others, or would you say you do them all equally while learnig/studying?

Kiana Tashakori 1D

delta u equals q at constant volume because the energy of the system is now dependent on changes in heat since the volume isn't changing. Also, since there is no work being done, w = 0 and you can omit it from deltaU = q + w, thus leaving deltaU = q.

Kiana Tashakori 1D

Heat capacity cant be negative since it is the amount of heat you need to raise the temperature of a substance, and if heat capacity was negative you wouldnt be able to actually raise them temperature.

Kiana Tashakori 1D

Hi! This happened to me during week two. I would just email your TA and explain the situation. Its pretty easy to get confused as to which forum your posting since many of the post are mixed together.

Kiana Tashakori 1D

Hess's law states that the change in enthalpy of a reaction is equal to the sum of the changes, and that this is possible because enthalpy is a state function.

Kiana Tashakori 1D

Yes! The standard enthalpy of formation for diatomic molecules such as the ones you listed is 0.

Kiana Tashakori 1D

heat is denoted by q, and enthalpy is denoted by h

Kiana Tashakori 1D

Hi! I can totally relate, its definitely easy to get overwhelmed by school/work and let the anxiety take over. I usually find that planning my weeks and what I need to do ahead of time helps immensely. It helps me stay one top of my priorities and make sure I get them done while finding time to rela...

Kiana Tashakori 1D

You don't include aqueous solutions because pressure changes only apply to/change gasses.

Kiana Tashakori 1D

The larger the Ka, the stronger the acid. This is because the larger the Ka, the more it dissociates and the more H3O+ will form. A larger Ka will result in a lower pKa though so lower pKa=stronger acid and larger Ka= stronger acid.

Kiana Tashakori 1D

You can leave out x if the k value is equal to or less than 10^-4, because at that point k is so small that it wont really affect the values.

Kiana Tashakori 1D

I found that practice problems are super helpful while studying. I think you can solve problems more quickly and easily when you exposed to lost of different problems. Attending review sessions and asking questions you may have at office hours also extremely helpful!

Kiana Tashakori 1D

Yes so I believe the test will be given on Respondus (lockdown browser) and we will have to be on a zoom call with our TAs while taking the test as well

Kiana Tashakori 1D

Hi! I think it would be a good idea to remember the constant, because like others have said, the topic is very important, and it will make it much easier and faster to solve problems involving the constant. Also I'm not 100% sure if it will be a given value on the exam but its good to know it just i...

Kiana Tashakori 1D

In order to be able to answer that question, you would also have to be given whether the reaction is exothermic or endothermic. Another possibility is that you will be given a Delta H. If you Delta H value is positive, it means that favors products because the reaction is endothermic. If Delta H is ...

Kiana Tashakori 1D

Hi!
When posting on Chemistry Community, I notice that sometimes when I click on posts within the Chem14B forum, It takes you to a Chem14A post. Does anyone have any tips on how to get around this/how to make sure you're posting on the right forum?

Kiana Tashakori 1D

Isochoric involves constant volumes while isometric just means the dimensions/measurements are constant.

Kiana Tashakori 1D

Hi! K changes when you add heat to a reaction because the equilibrium constant changes. More reactants will be produced, so reactants would be favored. K will increase as the temperature increases in endothermic reactions, and it will decrease when temperature increases in an exothermic reaction.

Kiana Tashakori 1D

Hi! To solve this, set up an ICE table using initial partial pressures, then take the resulting values and plug them into the equation Kp=(P(PCl5))/(P(PCl3)P(PCl2)). Kp is equal to 393, so you would have to plug that in as well and solve for x using a quadratic equation. The final step is to add the...

Kiana Tashakori 1D

Yes! The exams will be during lecture hours, which is why it is advised not to schedule two classes at the same time.

Kiana Tashakori 1D

The lectures are all recorded and uploaded to CCLE under the media tab! I also believe discussion sections aren't mandatory to attend but they are super helpful and recommended. I believe discussions aren't recorded so going to them would be beneficial.

Kiana Tashakori 1D

Changes in concentration/pressure/volume will definitely result in a reaction going out of equilibrium, but it will eventually compensate for that increase and will then work its way back to equilibrium.

Kiana Tashakori 1D

[NH3] should be squared not cubed! you're definitely on the right track though.

Kiana Tashakori 1D

The textbook is really useful for clarification of specific topics you don't understand! Id recommend reading it after watching the lecture videos. Other video lessons could also be really helpful when teaching yourself a topic.

Kiana Tashakori 1D

Does anyone have any advice on how to navigate through Chem community? This is my first time using the platform and it seems a bit complicated to use, especially since there are an overwhelming amount of posts and topics. Thanks!

Kiana Tashakori 1D

I would use google chrome rather than internet explorer or safari! Going incognito may also help if just switching to chrome isn't enough.

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