CHEMISTRY COMMUNITY

Molika Soben_3J

Thank you! I've been waiting for this (:

Molika Soben_3J

I think I remember Dr. Lavelle saying that the porous disk is one line when he was making announcements about our midterm, however I'm not too sure.

Molika Soben_3J

As our final is getting closer, I wish everyone good luck and

Molika Soben_3J

The formula sheet for the final would be identical to the back of the periodic table that you got with your course reader and also within your course reader. Also, I'm sure there will be values such as heat capacity and such given too.

Molika Soben_3J

Jocelyn_Dao_2N wrote:Why is the answer for number 4, 4-butyl-1,2-dimethylcyclohexane and not 1,butyl-3,4-butylcyclohexane?

When naming, once you get a lower number, then that's it. Since 2 is smaller than 3, then the name of the compound should be the one that includes the 2, not the 3.

Molika Soben_3J

The smaller the rate constant, the slower the reaction and vice versa. So given that k1 << k2, k1 is much smaller than k2 thus implying that the reaction rate for step 1 would be slower than that of step 2.

Molika Soben_3J

Me taking Chem 14B

Molika Soben_3J

The unit for the reaction rate is generally mol*L^-1*s^-1 or M*s^-1 for which M is mol*L-1. As for the units for the rate constant, it depends on the order of the reaction. For zero-order reactions, the units are mol*L^-1*s^-1 or M*s^-1 like the reaction rate. For first-order reactions, the units ar...

Molika Soben_3J

For the calculations for work, it is affected in the formulas for irreversible expansion and reversible expansion. For irreversible expansion, work is equal to negative pressure times delta V while reversible expansion is equal to negative nRT times the natural log of V2 over V1.

Molika Soben_3J

Is KNSY PV the Kinsey Pavillion near the inverted fountain?

Molika Soben_3J

I think it would be beneficial to know and understand what a heating curve is. A heating curve is a graph showing the temperature of a substance (y-axis) plotted against the amount of energy it absorbs (x-axis). A substance must absorb heat energy so that it can melt or boil. The temperature of the ...

Molika Soben_3J

In the textbook, question 21 of chapter nine asks you to calculate the entropy of a solid nanostructure made of 64 molecules in which the molecules are aligned in the same direction. Since it is only arranged in one way, W would be 1^64 which would equal 1 and plug it into the equation for entropy a...

Molika Soben_3J

I think we'll be given equations like last quarter where the equations given were pretty much specific to that quiz or concept. I'm not sure which equations we will be given.

What equations should we know and memorize? And which ones will be given to us?

Molika Soben_3J

Work is not a state function be use it is path dependent so it matters which route you take. Since displacement is needed, it is not a state function. The work you put into getting up to your dorm room by walking around the building, then to Bcafe, and up the stairs is different from the work of jus...

Molika Soben_3J

Standard state is basically the state of a substance or elements at room temperature. State being solid, Iiquid, or gas. For example, oxygen is a gas in its standard state which is O2 at room temperature where it's stable.

Molika Soben_3J

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."

Molika Soben_3J

Q: Why do chemistry professors like to teach about ammonia? A: Because it's basic material. Q: Why did the noble gas cry? A: Because all his friends Argon Q: Did you hear about the man who got cooled to absolute zero? A: He's 0K now Q: Why are chemists great for solving problems? A: They have all th...

Molika Soben_3J

Kc and Kp are the equilibrium constants of gaseous mixtures but the difference between them is that Kc is defined by molar concentrations, whereas Kp is defined by the partial pressures of the gasses inside a closed system. I think that for Kp it should be all gases in the reaction whereas for Kc th...

Molika Soben_3J

Q: Why did Carbon marry Hydrogen?
A: They bonded well from the minute they met.

Q: Why did Chlorine's sisters Boron and Carbon lock her in the closet?
A: Because she was too attractive!

Hilarious

Molika Soben_3J

Two chemists go into a restaurant. The first one says "I think I'll have an H2O." The second one says "I think I'll have an H2O too" -- and he died. A small piece of sodium that lived in a test tube fell in love with a Bunsen burner. "Oh Bunsen, my flame," the sodium pi...

Molika Soben_3J

Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.

Why do chemists like nitrates so much?
They're cheaper than day rates.

Molika Soben_3J

For question #7 on the quiz 2 prep, I don't understand why the Lewis structure of XeO2F2 would be allowed for Xe as a central atom but not for Ne as a central atom. What exactly is it asking? The problem states: Draw the Lewis structure for XeO2F2. Explain why this structure would be allowed for Xe ...

Molika Soben_3J

These are somewhat depressing...

What do you do with a dead chemist?
-Barium

Little Willie was a chemist. Little Willie is no more. What he thought was H2O was H2SO4.

I asked the guy sitting next to me if he had any Sodium Hypobromite and he said "NaBrO"

Molika Soben_3J

My TA said to balance out the biggest number on the reactant side first and the smallest last. So whichever atom has the highest number, balance that out first.

Molika Soben_3J

Ok thank you. I accidentally flipped through the quiz that didn't have the answers so I didn't see it.

Molika Soben_3J

Do we just complete the self-test, the quiz 1 preps, and then hand the workbook to our TA? Also, there are answers for every quiz prep except for the last quiz 3 prep so how does that work when the workbook gets graded?

Molika Soben_3J

I was going through the Fundamentals section and formula units kept on popping up. For example, in problem E.21, it asks to calculate the amount in moles and the number of molecules and formula units in a 10.0 g of alumina. Will someone explain to me the difference between number of moles, molecules...

CHEMISTRY COMMUNITY

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Re: Thursday Review Session Powerpoint 6-7PM

Re: Salt Bridge [ENDORSED]

Re: Post All Chemistry Jokes Here

Re: Formula Sheet for the Final Exam

Re: Quiz 3 Winter 2017

Re: Quesion on Actual Quiz 2

Re: Post All Chemistry Jokes Here

Re: Units for Reaction Rate and the Rate Constant

Re: Reversible vs. Irreversible [ENDORSED]

Re: Midterm Winter 2017

Re: Heating Curves

Re: When entropy=0 [ENDORSED]

Re: Will we be given equation sheet on quiz?

Re: Work is not a state function [ENDORSED]

Re: standard enthalpy

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: Kc vs Kp and all the other constants

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Quiz 2 Prep Question #7

Re: Post All Chemistry Jokes Here

Re: Balancing Chemical equations too slow... any advice? [ENDORSED]

Re: Workbook - Quiz 1

Workbook - Quiz 1

Fundamentals E.21: Amount in moles vs Number of molecules vs Formula units