CHEMISTRY COMMUNITY

Madison Hurst

For kinetics ws pt 1 number 5 why isn't C included in the rate law? Is it an intermediate? if so, how can you tell?

Madison Hurst

how do you determine units for rate constant?

Madison Hurst

Madison Hurst

what would the rate law be for 2A+2B->C be? Do you use the coefficients given for the order or no?

Madison Hurst

What is the explicit equation for activation energy?

Madison Hurst

You must replace the intermediates with their equal rate law expressions using the molar ratios when needed.

Madison Hurst

So is it technically a second order reaction, but because one of the concentrations is so big its basically constant?

Madison Hurst

What are the notes referring to when they say the orientations of colliding molecules must be the same?

Madison Hurst

Can the order of the reaction be determined by the units? I saw something that to solve for n (order) you can use M^1-n ?

Madison Hurst

When is the profile lnk vs 1/t and when is the profile lnk vs t?

Madison Hurst

What is the transition state and where does it go on the profile?

Madison Hurst

What are the steps to find Ka after solving for K in the Nernst equation?

Madison Hurst

How does the profile change if it is endergonic vs exergonic?

Madison Hurst

What is the difference between steady state and pre eq approaches?

Madison Hurst

what is the relationship between rate of reaction, rate constant, and half life?

Madison Hurst

Should the calculated E* value when adding E*s from half reactions always be positive?

Madison Hurst

How do you know which inert conductor to add Pt vs Hg?

Madison Hurst

How do you know if you're are given the standard free energy of formation versus just free energy?

Madison Hurst

When can you add the E* for each half reaction to get the cell E* and when can you not add them because its not a state function? This came up in Lyndon's review when we had to convert E* to delta G.

Madison Hurst

It depends on what you are given but most of the time if you are trying to find K but you're given delta H and delta S (or vice versa)

Madison Hurst

if the coefficients are proportional but different in the same 2 reactions, do you need to multiply E by the molar proportion or does it stay the same?

Madison Hurst

In the Gibbs WS #4 how do you find T? or can you just assume its at 25 C?

Madison Hurst

On #1 of the Gibbs to find the standard enthalpy and entropy of formation you have to do the sum of products minus the sum of the reactants using the numbers given right? For some reason I am not getting the same answer.

Madison Hurst

Why is a thermos considered an isolated system and not a closed system?

Madison Hurst

When do you know to take the integral when finding work?

Madison Hurst

Is heat absorbed or released during condensation?

Madison Hurst

What is isothermal expansion?

Madison Hurst

What changes to a system are reversible and which are irreversible?

Madison Hurst

What is the difference between isothermal and isometric?

Madison Hurst

Why does adding inert gases only affect the equilibrium constant in a closed system?

Madison Hurst

I believe the only variable that affects K is temperature.

Madison Hurst

What would K be if the reaction was only made up of solids and liquids, no gases or aq solutions?

Madison Hurst

How do you know which atoms affect the pH of a solution and which ones do not? For example in NH4Br how do you know not to include Br in the chemical equation?

Madison Hurst

How do you know if a compound can be amphoteric?

Madison Hurst

Are amphoteric and amphoprotic opposite properties? if not, what is the relationship between the two?

Madison Hurst

Why is hydronium sometimes referred to as H3O+ and sometimes as H+? What is the difference?

Madison Hurst

If an atom has a high electronegativity does it have a strong delocalization power too? Or weak delocal power?

Madison Hurst

Whats the difference between Lewis acids and bases and bronsted acids and bases?

Madison Hurst

When calculating pH do you only ever use the H3O+ concentration or will you ever use OH-?

Madison Hurst

Would I3 ^1- (Iodine) be polar or non polar? its linear with 3 lone pairs on the central atom but is there any net dipole?

Madison Hurst

Will nonpolar molecules always have induced dipole forces?

Madison Hurst

What is the difference between induced dipole and dipole? How do forces between them differ based on what combination you have?

Madison Hurst

what do the 2 and 3 mean in sp2, sp3, sp3d2 etc orbitals?

Madison Hurst

Several times in lecture Dr. Lavelle said the shape would be one thing if looking at lone pairs, however it would be named differently. How do we know when to name it correctly based on regions of e- density and when to just give the general shape that considers lone pairs?

Madison Hurst

Which bond has more energy pi or sigma?

Madison Hurst

Do you have to figure the lewis dot and/or VSEPR model to get the right hybridization? What are the steps to figure out if something needs hybridization?

Madison Hurst

Why are molecules considered octahedral that only have 6 bonds?

Madison Hurst

Why are some bond angles exactly 120 or 109.5 while others say they are slightly less than that?

Madison Hurst

If we are asked to predict bond lengths is it just finding the average based on numbers given to you? How could you determine bond lengths if you weren't given any additional information?

Madison Hurst

Relative to other types of bonds, how strong are hydrogen bonds?

Madison Hurst

Whats the difference between electronegativity and ionization energy?

Madison Hurst

Polarizability follows the same trend as atomic radius: increasing right to left and increasing down a group

Madison Hurst

When a structure includes atoms with expanded octets what the max number of electrons that can be held? Is it 10 because of the d orbital or can it be more?

Madison Hurst

When a structure includes atoms with expanded octets what the max number of electrons that can be held? Is it 10 because of the d orbital or can it be more?

Madison Hurst

When a test question asks for resonance structures should we show all possible ones or only the most logical ones?

Madison Hurst

How do you determine the number of bonds you should use between Carbon and nitrogen/carbon and carbon/oxygen? Also is there a method to determining where the hydrogens should be placed or can you just do whatever works for the total number of valence e-?

Madison Hurst

As explained in the lecture we can know the momentum and position of a large object such as a baseball going through the detectors but not an electron because it is so small that the detectors interfere with its path. My question is do particles larger than electrons react in the same way? or would ...

Madison Hurst

When an electron is excited to an n=2 or n=3 etc. state how long does it take to return to the threshold level where it emits a photon?

Madison Hurst

Can other particles (non electrons) have wave-like properties too?

Madison Hurst

Should we know why actual yield is lower than theoretical yield in the way specific to the problem or just know the general reasons that actual yield is less than theoretical yield?

Madison Hurst

When finding limiting reagents, how do you know what product to compare moles to if not directly stated in the problem? I noticed several module problems that said what is the limiting reactant for the product created? However, there was more than one product in the reaction.

Madison Hurst

When multiple units are defined in a reaction, is it best to convert to equal units before writing out a reaction? Or will it still be a valid answer if units are converted at the end?

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