CHEMISTRY COMMUNITY

Tamera Scott 1G

Will we have any problems that involve catalysts? If so, what would they look like?

Tamera Scott 1G

For the Arrhenius equation, is ln( k2/k1 ) = (Ea/R) * (1/T1 - 1/T2) the same as ln k= -ea/rt + ln A?

Tamera Scott 1G

Today in lecture Lavelle explained the difference between catalysts and intermediates, but I still don't understand how you can decipher between the two?

Tamera Scott 1G

When finding the order for each reactant to write the rate law, does the order of the concentrations matter when you compare experiments (for example, should it be rate 2/rate 1 or rate 1/rate 2)?

Tamera Scott 1G

Why is the equation ln([A]t[A]0)=−kt also written as ln([A]0[A]t)=kt? Are they the same thing?

Tamera Scott 1G

For problem 17 in the 6th edition, part a asks us to find the order for each reactant and the overall order of the reaction. When finding the order with respect to A, I assume that we need to look at experiments 2 and 4, but the concentrations for C are different. Is this a typo?

Tamera Scott 1G

In the 6th edition, the textbook goes over example 14.10: Using the Nernst Equation to find a Concentration. I don't understand where the ln Q= -0.42V/0.02593V came from. Can someone explain?

Tamera Scott 1G

Does n in the Nernst equation represent the number of electrons?

Tamera Scott 1G

In the 6th edition of the textbook, example 14.9 Using the Nernst equation to predict a cell potential sets the reaction quotient as Zn over Cu. Why is that?

Tamera Scott 1G

When canceling excess H20 molecules, does it matter which side of the reaction your H2O molecules are in?

Tamera Scott 1G

For 9.65 in the 6th edition, would you determine if compounds become less stable with respect to the elements as the temperature is raised by looking at their entropy? Or does it have to do with Gibbs free energy?

Tamera Scott 1G

Should you convert all the units into kJ/mol in the beginning of the problem or can you wait until the end when solving for ΔG with ΔG= ΔH -TΔS?

Tamera Scott 1G

For 9.63, how would you determine which are stable with respect to the decomposition into their elements?

Tamera Scott 1G

I understand that isobaric means that pressure is constant and ΔP=0, but what equation does it play a role in?

Tamera Scott 1G

When looking at the equation ΔS=q/t, could we say that ΔS=nΔH/T as well?

Tamera Scott 1G

Will we ever need to use ΔU=3/2nrt?

Tamera Scott 1G

As temperature increases, ∆S decreases, and I know this is because temperature is the denominator of the equation ∆S= -∆H/T, but what is the conceptual reason for this?

Tamera Scott 1G

When finding entropy changes due to a temperature change, I'm still confused as to when we are supposed to use Cv= 3/2R and Cp= 5/2. Can someone explain?

Tamera Scott 1G

For #25, I understand that there are 6 different positions or orientations for the molecule SO2F2, but how to we find what 6 is to the power of?

Tamera Scott 1G

How is internal energy stored as both molecular kinetic and potential energy?

Tamera Scott 1G

Why is the change in enthalpy equal to heat absorbed or released? How does that work?

Tamera Scott 1G

Lavelle mentioned in lecture that bond enthalpies were not very accurate when calculating reaction enthalpies. Out of the remaining 2 methods, which one gives you a more accurate number?

Tamera Scott 1G

How do you tell when you are dealing with a reversible and irreversible process?

Tamera Scott 1G

What is the relationship between ΔH and ΔU?

Tamera Scott 1G

Does the state of matter affect the enthalpy?

Tamera Scott 1G

This problem requires us to work backwards, how would I go about this problem?

Tamera Scott 1G

Is percentage ionization the same as percentage deprotonation and protonation, as mentioned in the textbook?

Tamera Scott 1G

How do we identify polyprotic acids and bases?

Tamera Scott 1G

In today's lecture, Lavelle mentioned that in the example of the ATP hydrolysis, to calculate the change in molarity you need to subtract the equilibrium molarity from the initial molarity of the ATP. How did that number apply to the ADP and Pi equilibrium concentrations?

Tamera Scott 1G

I understand that raising the temperature of an equilibrium will tend to shift its composition in the endothermic direction of the reaction, but how do you know which side of the reaction is endothermic and exothermic?

Tamera Scott 1G

Does anyone know why increasing pressure by introducing an inert gas have no effect on the equilibrium composition?

Tamera Scott 1G

Lavelle mentioned that biological compounds with N lone pair can act as a base. What about acids?

Tamera Scott 1G

Can someone explain what makes bases have a soapy feel again?

Tamera Scott 1G

Lavelle talked about calculations involving strong acids or bases. Can someone provide an example of one?

Tamera Scott 1G

I am still having a hard time figuring out the difference between brosted and Lewis acids and bases. Can someone explain?

Tamera Scott 1G

What kind of questions will be on the final in regards to the biological importance of coordination compounds?

Tamera Scott 1G

How do you figure out that CN has a -1 charge? I tried drawing out the lewis structure but did not get that answer.

Tamera Scott 1G

Can someone explain why chelating ligands can bind cations tightly?

Tamera Scott 1G

Do dipole moments have to do with whether or not something is polar only?

Tamera Scott 1G

Today Lavelle mentioned that the oxidation state of Fe in the formula [Fe(CN6)]4- is +2. How did we conclude to that?

Tamera Scott 1G

Lavelle mentioned that double bonds is treated as a region when you are trying to find hybridization. Is that the same for triple bonds?

Tamera Scott 1G

What is the difference between hybridized and unhybridized orbitals?

Tamera Scott 1G

I know that Lavelle went over sigma and pi bonds, but I am still confused as to what the difference is between them, and their significance. How would a problem involving sigma and pi bonds show up?

Tamera Scott 1G

I understand that there is no subscript for A when writing the VSEPR formula in the "AXE" form, but does it have a purpose for being included in the formula?

Tamera Scott 1G

For molecules with an octahedral shape, the bond angles can either be 90 or 180 degrees. How do you know which one to apply?

Tamera Scott 1G

When doing VSEPR models, there are questions that require you to know whether a molecule is polar or nonpolar. How can you tell?

Tamera Scott 1G

Why do stronger intermolecular forces causes things to become solid, while weaker intermolecular forces causes things to become liquid?

Tamera Scott 1G

How do you calculate bond lengths? Do you add the given lengths with a fraction of the number of resonance structures?

Tamera Scott 1G

So to clarify, more electrons causes a molecule to become more distorted and polarizable?

Tamera Scott 1G

I understand that both electronegativity and ionization energy play a role when drawing a lewis structure, but which is more important to consider?

Tamera Scott 1G

Can someone explain why Hydrogen can't be the center of a lewis structure?

Tamera Scott 1G

What happens when the electronegativity difference is between 1.5 and 2?

Tamera Scott 1G

I'm not sure if we have went over Coulomb's law yet, but what exactly does it state?

Tamera Scott 1G

Could someone explain again why Chromium and Copper have exceptions when it comes to writing their electron configurations? What happens to the electrons?

Tamera Scott 1G

Is the equation En=-hR/n^2 the same as 1/λ= R(1/I^2-1/j^2), with I being the lower energy level and j being the higher energy level? If so, why isn't Planck's constant used in the second equation?

Tamera Scott 1G

I agree, E=hv has both energy, (E) and frequency (v) in the equation, so it solidifies their relationship.

Tamera Scott 1G

With the DeBroglie equation, are you able to use it to find the wavelength of protons and neutrons as well? It is not limited to electrons?

Tamera Scott 1G

I have yet to solve this problem, but I do know that for part a, you will need to use the DeBroglie equation of wavelength= h/mv. First, you will need to convert units before inputting anything into the equation. The velocity has to change from km*s^-1 to m*s^-1, so multiply (3.6 *10^3 km*s^-1) by (...

Tamera Scott 1G

I've also seen E=hf once, does anyone know if that is the same as E=hv?

Tamera Scott 1G

^ I was also having trouble with this question.

Tamera Scott 1G

Today in lecture Lavelle went over Rydberg's constant. I understand that it has to do with hydrogen, but can someone explain exactly what it is used for?

Tamera Scott 1G

Problem 1.9 in the 6th edition mentions: A college student recently had a busy day. Each of the student’s activities on that day (reading, getting a dental x-ray, making popcorn in a microwave oven, and acquiring a suntan) involved radiation from a different part of the electromagnetic spectrum. Com...

Tamera Scott 1G

I was wondering the same thing as well, I do believe it is good review however.

Tamera Scott 1G

I like the idea of turning the decimal into a fraction, it helps me know exactly what I need to multiply by to get a whole number!

Tamera Scott 1G

I was completing the post assessment for the Empirical and Molecular Formulas module, and I am having problems with this question: L-Dopa, a drug used for a treatment of Parkinson's disease, is 54.82% C, 5.62% H, 7.10% N, and 32.46% O, and has a molar mass of 197.19 g/mol. What is the molecular form...

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