CHEMISTRY COMMUNITY

Natalie Hunt 1E

I just redid this problem and the answer for q is the answer that you get when you use 10 degrees C as the change in temperature so the change in temperature in the answers should be 10 degrees C instead of 20 degrees C.

Natalie Hunt 1E

For Question 1B on the Winter 2014 Practice Final Exam, the question asks you to calculate the heat that the potion received and you are given the mass, two temperatures, and the heat capacity. In the provided answers, it says that the change in temperature is 20 degrees C. However, in the question ...

Natalie Hunt 1E

Dear Dr. Lavelle, Thank you so much for everything you have done throughout Chemistry 14A and 14B. You truly are an amazing professor, and it is so evident that you want to see your students succeed. You provide your students with so many resources to help us succeed, and I am so grateful for your h...

Natalie Hunt 1E

Rachelle_Stark_3H wrote:Where do I find the answers to the quiz 3 preparatory quiz??

Dr. Lavelle posted the quiz 3 answers towards the beginning of this thread.

Natalie Hunt 1E

Corey Switzler 2L wrote:Where can we find the answers to practice quiz 3?

The answers to the quiz are posted at the beginning of this thread.

Natalie Hunt 1E

AlexandraOsterland_3E wrote:For the quiz will we have to know how to draw transition states? Or will just drawing the arrows for each step in the reaction suffice?

I believe we will need to know how to draw transition states. I was at a UA session today, and we went over transition states and how to draw them.

Natalie Hunt 1E

Natalie Hunt 1E

chris2E wrote:Is there a reason why number six's answer has three significant figures despite the given concentration 0.35M having two significant figures? Do we not bother with sig figs when ln is involved?

Number six's answer is 0.30M, which has two sig figs.

Natalie Hunt 1E

Will we need to know the details of radioactive decay? No, I do not believe so. I think the radioactive decay thing was just an example to show what real-life scenarios the concept can be applied. No, we do not need to know that information. As Dr. Lavelle said in an earlier post, "Page 65 wil...

Natalie Hunt 1E

Can anyone help me with number 6 from Quiz two preparation? I don't understand how the answer is 0.30 M I used the second order integrated Rate law, and my answer for K was 0.11092 i was wondering if i am going in the right direction and if so can you help me finish peals and thank you very much. Y...

Natalie Hunt 1E

What's the difference between an irreversible process and a reversible process? A reversible process is one where T is constant and V increases while P decreases. For reversible/isothermal processes, we use the equation: w=-nRTln(V2/V1). For irreversible processes, T changes, and we use the equatio...

Natalie Hunt 1E

Nilla Sivakumar 2H wrote:Has it been decided whether or not we will have lecture on the day of the midterm?

I believe that Dr. Lavelle said that he has not yet made a decision as to whether or not we will have lecture on the day of the midterm.

Natalie Hunt 1E

Natalie Hunt 1E

Natalie Hunt 1E

Can anyone explain how they calculated the enthalpy of vaporization for question 4? deltaH sublimation = deltaH vaporization + deltaH fusion so by manipulating the equation to make deltaH vaporization = deltaH sublimation - deltaH fusion, you can then calculate the enthalpy of vaporization given th...

Natalie Hunt 1E

Can anyone explain how they calculated q in #3? I was able to calculate w, and I know how to calculate deltaU if I can determine q. Do we assume that deltaU = 0, which would make q=-w? Thank you!

Natalie Hunt 1E

They are available for pickup at the Information Desk on the 3rd floor of Young Hall. You just have to present your Bruin card, and you will then receive your final. I went yesterday around 10 A.M. and there was someone at the Information Desk. I would assume that you are able to pick them up at any...

Natalie Hunt 1E

The finals are currently available at the Information Desk on the 3rd floor of Young Hall. All you need to present is your Bruin card and then you will receive your final.

Natalie Hunt 1E

Anything derivations that we have gone over in class are fair game.

Natalie Hunt 1E

Also, if you do not have the Chem 14A Course Reader and do not know anyone who has it, there is the same two pages about sig fig rules in our current Course Reader. It is on pages 122 and 123 immediately following the practice quizzes.

Natalie Hunt 1E

I would be interested as well! I think it would be particularly helpful to go over the quiz in the back of the course reader together since we are not provided with the solutions.

Natalie Hunt 1E

Every dipole has its moment.

Two atoms are walking down the street and they run into each other. One says to the other, "Are you all right?" "No, I lost an electron!" "Are you sure?" "Yeah, I'm positive!"

Got more problems? Call Avogadro at 602-1023.

Natalie Hunt 1E

I did not receive a quiz workbook either. I think that this is new for this quarter. However, I did notice that in the back of our course reader before the practice midterms and finals there are three practice quizzes. There is one for each quiz. I assume that those are for us to do, but we do not h...

Natalie Hunt 1E

On page 164 in the course reader, there is a table of common monoprotic acids, common weak bases, and common polyprotic acids. I knew that we should probably know the name and formula but do we need to know the Ka and Kb values of these acids and bases or is that just for reference?

Natalie Hunt 1E

Q: What did the bartender say when oxygen, hydrogen, sulfur, sodium, and phosphorous walked into his bar?
A: OH SNaP!

Q: According to a chemist, why is the world so diverse?
A: Because it's made up of alkynes of people

Natalie Hunt 1E

Q: Why are chemists great for solving problems?
A: They have all the solutions.

The name's Bond. Ionic Bond. Taken, not shared.

Natalie Hunt 1E

I believe that the coordination number on that one is 6 because there are three bonds from the (CN)3, two bonds from the (en), and one bond from the (NH3) for a total of 6. So 6 ligand bonds give a coordination number of 6.

Natalie Hunt 1E

Q: What do you do with a sick chemist? A: If you can't helium, and you can't curium, then you might as well barium. Helium walks into a bar, The bar tender says "We don't serve noble gasses in here." Helium doesn't react. Q: If H2O is the formula for water, what is the formula for ice? A: ...

Natalie Hunt 1E

We went over this question in my discussion this week and it is assumed that in order to fill each of the carbon octets, hydrogen atoms are attached. So, instead of adding lone pairs to the carbon atoms in the ring structure, hydrogen atoms are attached to each carbon atom to fill the carbon octet. ...

Natalie Hunt 1E

I had this same question along with a similar one. For Cl2-, because the 3d orbital has slightly more energy than the 4s orbital, does the electron go to the 3d orbital before the 4s orbital making the configuration [Ar] 3d^1?

Natalie Hunt 1E

I believe that the trend does not apply to noble gases because noble gases already have a full octet. Noble gases do not want another electron because that would mean that they would have to make another shell since their octet is already filled.

Natalie Hunt 1E

Q: What did the chemist say when he found 2 new isotopes of Helium?
A: HeHe

Natalie Hunt 1E

Natalie Hunt 1E

https://storage.googleapis.com/imgfave/ ... 837604.jpg

Natalie Hunt 1E

I completely agree with Helena! I was looking ahead and noticed that online there are only videos posted through Chemical Equilibrium. I find these videos very helpful because they allow me to pause and rewatch as many times as I need while taking notes. Will you keep adding more videos as the quart...

Natalie Hunt 1E

I know someone asked if all TI calculators are not allowed, but is a TI-34 calculator allowed? I do not think this model is programmable but I want to double check before the first quiz next week.

Natalie Hunt 1E

Yes, you always base it off of the lowest amount of sig figs that were given in the problem.

Natalie Hunt 1E

Yes I think that would be super helpful!

CHEMISTRY COMMUNITY

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Re: Winter 2014 Final Question 1B

Winter 2014 Final Question 1B

Re: Saying Thank You to Dr. Lavelle

Re: Quiz 3 Winter 2017

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Re: Quiz 2 Winter 2017

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Re: Midterm Winter 2017

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Re: Post All Chemistry Jokes Here

Re: Quiz 1 Preparation Answers

Re: Quiz 1 Preparation Answers

Re: 14A Final Exams

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Common Acids and Bases

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Re: Are the coordination numbers just inside of brackets? [ENDORSED]

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Re: Practice midterm question

Re: Workbook: Quiz 2 Prep #4

Re: Trends in periodic table

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Re: Where to begin? [ENDORSED]

Re: Calculators [ENDORSED]

Re: Percentages Sig Figs? [ENDORSED]

Re: Evergreen Study Group