CHEMISTRY COMMUNITY

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If Avogadro calls, tell him to leave his number.

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All the best chemistry jokes...Argon

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In a sports relay race, a chemical kinetics specialist runs slowly, and his group loses the race.

When the chemical kinetics specialist is asked why he ran slowly, his reply was “I always wanted to be the significant rate determining step”.

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For a reaction 2A + B 2C, with the rate equation: Rate = k[A]2[B] (a) the order with respect to A is 1 and the order overall is 1. (b) the order with respect to A is 2 and the order overall is 2. (c) the order with respect to A is 2 and the order overall is 3. (d) the order with respect to B is 2 an...

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The speed of a chemical reaction (a) is constant no matter what the temperature is. (b) is independent of the amount of contact surface of a solid involved. (c) between gases should in all cases be extremely rapid because the average kinetic energy of the molecules is great. (d) between ions in aque...

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What is a unique rate of a problem in kinetics? for example 6th edition textbook number 15.3 (c) - the answer key doesn't have a section for this...

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What happens if there is no salt bridge in a galvanic cell? also what is the difference between a salt bridge and a porous disk? How does that affect the lines you draw

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For the upcoming exam this week will we be expected to know how to draw out a Galvanic cell?

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Did Karen post her most recent handout answer key that we weren't able to go over in session?

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^o means it is at standard conditions, this also can be applied to G or S

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how do you find the K value from lnK. For example in problem 11.19 a and b from 6th edition? I never learned this and the solutions manual skips the process...

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what is the difference between an anode before and after reversal? ex: 6th addition problem 14.11

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It should not matter because they mean the same thing, but the textbook prefers H+

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How many overall points minimum do you need to get a B- or a B in this class. The syllabus only states that 250/500 is a C-.

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How do ideal gases affect a reaction? I know that it may change the C value such as 5/2R or 3/2R

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If you cool a system how does it affect the reaction?

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What is the homework for this week? Is there a specific topic we should do problems for? (We aren't learning any new concepts this week)

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What represents a negative change in entropy and a positive one? based on the type of reaction

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if something is isothermal should you always assume that it is also reversible? what is the difference between the two

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What are you calculating with this equation: delt S (entropy) = q/T and why does T need to be in K?

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Can someone explain what Lavelle was going over in lecture today about how dV or the derivative in V solves for something? And also I don't understand why the main equation we went over today involves taking an antiderivative/integral. Is this because we want to solve for the derivative and find the...

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Typically if you are given a base, you solve for pOH, but if you are asked to find the pH, then you must convert from pOH to pH by using this formula: -14.00 = pOH + pH. Or 14.00 - pOH = pH

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I have a question related to both Biology and Chemistry. When I was at a PLF today for lifesci 7A, they said that when you break a bond, you go from high potential E to low potential E, which means that it is exergonic, because you release energy. However, I was told last quarter in chemistry that i...

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What are the main equations used for Thermodynamics that we should get comfortable with and what do they solve for?

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for problem 4 on the second worksheet, how do you find the concentration of CO3 2- you are given the concentration of H2CO3

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can you please explain the steps of this question on worksheet 2: How many grams of formic acid, HCOOH, do you need to prepare 1.00L of a pH 3.26
solution? Ka of formic acid = 1.8 x 10-4? I have no idea how to solve

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can someone explain step by step how you solve 12.57 6th edition. I think the solutions manual is incorrect or is just confusing...

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what does 10-ph equal?

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How can you easily identify is something is going to work as an acid or a base in an aqueous solution. For example, in hw 12.55 6th edition, CH3COOH serves as an acid, but it has an OH group, so I would think it would work as a base....Will it be more clear to identify on the test?

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does lower pka mean that it's a stronger acid? and does high ka go with strong acid as well?

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If you were to be given a base - such as Bf3(OH)- and you knew that you needed to make an equation to solve. How would you set it up? What is the rule of thumb and how to you know when to add water?

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How do you know how to rewrite the equation in homework problem 12.37. For example, it asks for weak acids to write the equilibrium equation and Ka value and if its a weak base to write the equation and Kb. It also asks about conj base. So for part (a) it asks this for HClO2 and I wrote the expressi...

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what does it mean when you put a zero around a base...for example: (Ba(OH)2)0. It shows this on the answer key for 12.25

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For the 6th edition textbook homework 12.23 part (a), how do you know that since the Kw provided is 2.1x10^-14 that that is equivalent to x^2. So the problem can be set up as (H3O+)(OH-)=x^2. Is this because if you take the square root of 2.1x10^-14 is 1.4x10^-7 mol/L? I wouldn't have thought of thi...

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what is Lavelle's email address? I couldn't find it on the website

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I understand that homework points are separate. But can you ask questions on chemistry community about homework and have that count toward your 3 points?

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Do homework questions count towards our weekly 3 discussion points?

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what is the difference between a liquid and an aqueous solution?

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If a chemical equation has aqueous solutions in it that means that it can dissolve in water. So if you were to write an equation, how do you know whether or not to include water?

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for part c, how do you know if there is a tendency to form more reactants or more products...how does the Q value being less than K value affect his?

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Thank you! How do you find the % decomposition? it says (6/11) x 100% but where does 6 come from?

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I don't understand how you can identify which flask represents the point in time at which the reaction has reached equilibrium? Can someone please explain this. I tried counting out the number of X2 molecules as well as the dissociation of diatomic molecules... The answer is flask #3 but I don't kno...

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