CHEMISTRY COMMUNITY

kjwong02

Hi! So, a galvanic cell can also be called a battery, and it is occurs when chemical energy is converted into electrical energy due to a spontaneous redox reaction. Because it is spontaneous, it also means that the voltage (V (joule/coulomb)) is positive. When it comes to drawing cell diagrams, they...

kjwong02

Hi! For these two problems, the anode and cathode are given based on their positions in the cell diagrams. The anode is to the left of the salt bridge and the cathode is to the right!

kjwong02

I am not sure if this helps, but I have seen some people label their responses "extra credit #various" in order to help the TAs see their extra responses on chem community. If you want to ensure that you get your extra credit points, you could try adding these.

kjwong02

Hi! The anode is the one that gets oxidized (aka the one that loses electron(s) "leo") and the cathode is the one that gets reduced (aka the one gaining electrons). Based on the example you gave: Mn + Ti+2 -> Mn+2 + Ti, Mn would be the anode because it lost two electrons and Ti would be th...

kjwong02

^ Also to add on, the final is gonna be one question longer!

kjwong02

"The beautiful thing about learning is that no one can take it away from you" - BB King. This quote always motivates me cause it reminds me no matter what the test score ends up being, we learned something!

kjwong02

He also announced that there will be an extra question on the final, so there will be a total of 104 possible points. But, the final is still worth only 100 points and the percentage will be converted to be out of 100 points. He will also be providing two practice Respondus questions that will be on...

kjwong02

From my understanding, the phases of the compounds in the original reactions stays the same. When you had H2O and OH to the balanced equations, H2O should be in liquid phase and OH should be aqueous.

kjwong02

Hi! The last couple of weeks I have been unable to log on to the Chem 14B Website. I keep getting this error message when I try to use the password provided. I was wondering if this has happened to anyone else, and if anyone knows how to fix it. Thank you!

kjwong02

Hi! I also did not see the equation sheet, but I downloaded it earlier. I am attaching a pdf file of it to this response!

kjwong02

I believe that a redox reaction is spontaneous if E (naught) for the redox reaction is positive. It represents the electrode potential.

kjwong02

I think it might be later than when we got our last midterm scores based on the email he sent with Canvas having problems changing the answer key for the question he is fixing.

kjwong02

I understand the actual equations and what to plug in but can someone explain the conversions needed to get to Joules in part a? I keep getting 0.28 as my final answer and I don't understand exactly which units I'm getting wrong. Hi, so when that number .28, is in L.atm, and we want the final answe...

kjwong02

Hi, I started this question by figuring out what heat was required in order to melt the ice. I did this by converting the ice to moles and multiplying it by the specific heat capacity of water. This number goes on the left side of the final equation used. I then multiplied the grams of ice by its sp...

kjwong02

Hi, I started this question by figuring out what heat was required in order to melt the ice. I did this by converting the ice to moles and multiplying it by the specific heat capacity of water. This number goes on the left side of the final equation used. I then multiplied the grams of ice by its sp...

kjwong02

Hi! So, I used the first and third equations to get what I needed for the final equation. There is some manipulation needed. For example, I multiplied the third equation by 3. I used the second and fourth equations in order to cancel out some of the compounds that were in the wrong phase. I hope thi...

kjwong02

Hi! I really appreciate the reviews of concepts for enthalpy you made. It seems you've puts lot of effort into it! I think you've made a typo in the second to last paragraph. I think you meant that an exothermic phase change releases heat as opposed to requires heat.

kjwong02

Hi! So, the parts of the graph with a slope of 0 mean that a phase change is occurring because even though heat is being added, the temperature is not increasing. The other increasing slopes represent single phases. Hope this helps!

kjwong02

Hi! In the beginning, I also found myself struggling to be disciplined and keep up with the lectures on time. I have found what works the best for me is watching the lecture videos with people I've made in the same lecture. It helps to keep us accountable by watching together!

kjwong02

Hi! I found this percentage by dividing the H+ concentration at equilibrium with the initial lactic acid concentration and then multiplied it by 100. Hope this helps!

kjwong02

Hi! On the pdf explaining the exam schedule it says we only need a scientific calculator. Does this mean we are not allowed to use a graphing calculator or it is just not necessary? Thank you!

kjwong02

Hi! So, as you said, B formal is the sum of B and BH+. I didn't really use an ICE table for this problem because there was no given initial concentration. I found BH+ by figuring out the concentration of OH- because they are equal. I found OH- by taking the inverse log of pOH. I used the Kb= ((OH-)(...

kjwong02

Hi! I finished my Achieve homework for Week 1 and got 10/10. However, on my Canvas, the grade is 4.8/5 points. Has this happened to anyone else or does anyone know why this happened? Thank you!

kjwong02

In response to EmiD 2H, yes if Q was greater than K, then reactants would be favored and the reaction would shift left.

kjwong02

Hi! When I did this problem, I started by figuring out which equations would be helpful to me solving it. For example, I know that I need to end up with 2NH3 on the reactant side. So, I reversed the third reaction and took the inverse of Kc. Next would be figuring out which equations could also be m...

kjwong02

Hi! Although I am not exactly sure if we would be allowed to go to the in-person lectures. I have watched both our pre-recorded lectures and the recorded lectures from the live 10 AM class, and I can answer your second question. I would say that the content is the same! The same lecture slides are u...

kjwong02

Hi! From my understanding, the calculations would be the same. The main difference between an equation in which all reactants and products are in the same state and an equation where this is not the case, is that the former would be called an "homogenous reaction", and the latter is a &quo...

kjwong02

Q: What is the chemical formula for sea water?

A: CH2O!

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