CHEMISTRY COMMUNITY

charlotte_jacobs_4I

When does Delta H=q?
Delta H=w?
If ever.

charlotte_jacobs_4I

When is delta U=0?
delta U=q?

charlotte_jacobs_4I

What determines the exponent for rate laws, the coefficient (like in equilibrium), or the order?

charlotte_jacobs_4I

To solve for Delta n is it moles of the product minus moles of the reactant?

charlotte_jacobs_4I

Does Enthalpy exist at a constant volume?

charlotte_jacobs_4I

Which homework problems are applicable to this chapter? Week 9?

charlotte_jacobs_4I

Are solids, gases, and aqueous the only phases used on a cell diagram? Are liquids never listed?

charlotte_jacobs_4I

what homework questions does test 2 cover from the seventh edition book?

charlotte_jacobs_4I

How do you decide what is at a constant with out it being said. I have run into questions that don't talk about volume then the answer seems to imply that is is constant. How is this determined? Are there any rules informing you on how to decide? What happens if nothing is stated?

charlotte_jacobs_4I

How are Gibb's Free Energy, Work, Enthalpy and Entropy related?? is this significant?

charlotte_jacobs_4I

How do you determine if Gibbs free energy is spontaneous or not?

charlotte_jacobs_4I

I am confused on the porous disk that keeps being referred to in class. What is the difference between a porous disc and a salt bridge?

charlotte_jacobs_4I

What are the rules for determining which is a cathode and which is an anode?

charlotte_jacobs_4I

What sections of homework should we be looking at for test 2?

charlotte_jacobs_4I

Most of the formulas that are not provided can be derived from the ones given.

charlotte_jacobs_4I

What are the rules for delta U = 0? When does this happen? Under what circumstances?

charlotte_jacobs_4I

For the 7th edition of the textbook what is the last section that will be covered on the midterm?

charlotte_jacobs_4I

Is this just having to do with constant volume or would it also be constant temp or pressure?

charlotte_jacobs_4I

Are there study guides posted for the thermo chem information?

charlotte_jacobs_4I

What are the rules and equations that go with ideal gases? Are idea gases noble gases?

charlotte_jacobs_4I

How are phase changes and enthalpies related? Does it have to do with exothermic and endothermic reactions?

charlotte_jacobs_4I

In many of the problems in the homework there were equations with U and q. What do these variables stand for?

charlotte_jacobs_4I

I always think of an isolated system like a closed hydroflask compared to a closed water bottle. The hydroflask has layers of steel around it and truly isolates whats inside.

charlotte_jacobs_4I

Becky Belisle 1A wrote:It depends on which defintion you use. A Bronsted acid donates a proton, so it must at least have a proton in the formula.

Which definition should we be using to determine if something is an acid or a base?

charlotte_jacobs_4I

What are the steps for solving for a percent ionized/deprotonized question and how does that relate to the 5% rule?

charlotte_jacobs_4I

Q is the same equation as K, but Q is calculated at anytime during the reaction and compared to K. If K and Q match then the system is at equilibrium. If Q<K it moves towards the products, if Q>K it moves towards the reactants.

charlotte_jacobs_4I

What equations are going to be needed for this upcoming test?

charlotte_jacobs_4I

Are there any tricks for knowing when to use an ICE table?

charlotte_jacobs_4I

If you are saying higher pH in terms of numbers closer to 7 than yes you would be correct. If you think about a strong acid that has completely dissociated, the humber of H+ ions in that solution will be greater than that of a weak acid.

charlotte_jacobs_4I

I think about like a proportion. So if there are 3 particles of reactant there has to be 3 particles of products. Dividing those numbers would equal 1.

charlotte_jacobs_4I

I believe each K (other than Keq) has units but when it is placed into the equation the units are no longer needed.

charlotte_jacobs_4I

I do not understand the concept that a human becoming at equilibrium means they are dead? Why would that be?

charlotte_jacobs_4I

I know there are Lewis acids and bases and Bronsted bases and acids, are there anymore we should know? Also, what are the differences between them?

charlotte_jacobs_4I

I believe thats how it will work, and I don't think we have to post the week.

charlotte_jacobs_4I

Are there any specific rules that apply only to acidic and basic salts? Along with this are there specific calculations for acidic and basic salts?

charlotte_jacobs_4I

I remember Dr. Lavelle talking about either sigma or pi bonds being able to rotate, which one was it? Thank you!

charlotte_jacobs_4I

How do you determine the dipole direction and sign on a molecule?

charlotte_jacobs_4I

Is it necessary that we know VSEPR shape formulas for the exam?

charlotte_jacobs_4I

What exactly is the difference between polar ionic bonds and polar covalent bonds?

charlotte_jacobs_4I

I am still a bit confused on how to find the polarizability of and ion and what exactly polarizability is. If anyone could help that would be great! Thank you!

charlotte_jacobs_4I

Is the polar power only determined by the atomic radius? For this would it be the smaller the radius the larger the polar power?

charlotte_jacobs_4I

Does the distance between the bonds effect the boiling point? Would this cause the bond to be stronger or weaker?

charlotte_jacobs_4I

In terms of homework problems for this week which questions would be the most applicable? Which section would be the best to help learn VSEPR structures?

charlotte_jacobs_4I

Is anyone aware is test 3 is next week? what happens if our discussion is over break?

charlotte_jacobs_4I

Are there any special bond length rules? Let me know any information is appreciated!!

charlotte_jacobs_4I

Remember that Ionization energy is how much energy it takes to create an ion from a stable molecule. This will be very high for noble gases, because they are so stable.

charlotte_jacobs_4I

I know that there are specific equations that you can only use for an electron or something with mass. Which equation would you use to find the frequency of an electron?

charlotte_jacobs_4I

Hey!! I'm just wondering if anyone has any keywords and definitions that would help us study for the midterm??

charlotte_jacobs_4I

There are study questions posted on here too and they seem to cover most of the main topics so i would use that as a guideline.

charlotte_jacobs_4I

In terms of this rule is the up arrow electron positive or negative 1/2?

charlotte_jacobs_4I

For Rydberg's equation should the answer ever be negative? What if you go from n=4 to n=2 or n=3 to n=5?

charlotte_jacobs_4I

I was running into the same problem. I'm not sure but is the answer ever supposed to be negative?

charlotte_jacobs_4I

What is the relationship between En= -hR/n2 and Rydberg's equation?

charlotte_jacobs_4I

I have been looking around and I can't find a clear answer to tell me if in the Rydberg equation it is R((1/(the original value of n))-(1/(the final value of n)) or the opposite way for the final and initial values. Please let me know if you can! Thank you!

charlotte_jacobs_4I

For Heisenberg's Indeterminacy Equation we have to find either delta p or delta v. What are the definitions of delta p and delta v so i know which variable a given value falls under? This value would then be placed in the equation and solved.

charlotte_jacobs_4I

When you say "discrete values" does that mean it can only have one value at a time or just a small range of values?

charlotte_jacobs_4I

I believe that it would be helpful to do both Ch 1 and Ch 2, since we have a test next week. The seven problems will be due in your discussion section, too.

charlotte_jacobs_4I

Hello! i am having some trouble remembering how sig figs work with zeros. For example how many sig figs are in 570, 500, 4.0, 40.0, .04, 0.04, .40, .0040? if anyone could help me out with this that would be greatly appreciated. Also if there are any other tricks for knowing how many sig figs there a...

charlotte_jacobs_4I

Hello! I'm don't think it is completely necessary to convert your answers to mL from Liters, but I usually do since there are sometimes other steps to the problem where you are subtracting a volume from a greater volume and in this case they would both need to have matching units.

charlotte_jacobs_4I

The way I have been looking at it is first reviewing the problems that we did in our discussions. Those seem to have many important features. Next I am going to watch the audio videos and take notes. The pre and post assessments i am going to use to gauge my understanding of the concepts and then ad...

charlotte_jacobs_4I

I have been writing at least part of the question out on the homework. I find that if helps me review and remember what the question was asking without going all the way back into the book.

charlotte_jacobs_4I

First you take molarity and multiply it by liters. Then you that the value in mols that you are left with and multiply that by grams/mole. Finally you are left with grams.

charlotte_jacobs_4I

The seventh edition starts with pages like F1. The question that we are supposed to answer are usually at the end of each letter sub section. Once the F pages end the pages are only labeled by numbers.

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