CHEMISTRY COMMUNITY

smurphy1D

Lol just as everyone else should be!

smurphy1D

If NO is the catalyst then what one is the intermediate?

smurphy1D

If pure water is added to either a cathode or anode, would it change the E at all?

smurphy1D

Electrochemistry was my favorite, seemed to be the easiest as well.

smurphy1D

Does the bottleneck effect cause a change in K overall?

smurphy1D

If the catalyst is a solid, in lecture it was said that the reactants sit on top and are adsorbed, does this mean the solution is literally a liquid on top of the solid or are they just in a container with each other?

smurphy1D

How can you recognize what step is slow in the reaction?

smurphy1D

The activation energy is the amount of energy needed for the reaction to occur

smurphy1D

Thanks! So would I then be able to tell if a catalyst is involved if i am able to spot an intermediate just from the graph?

smurphy1D

Units are useful because each order reaction has different units

smurphy1D

A catalyst in consumed first, whereas an intermediate is produced fist.

smurphy1D

What is an intermediate in a reaction and how can you tell when they occur? For example this problem shows a graph and states there are 2, but how can I tell?

smurphy1D

Why are all of the units different for each order of reaction?

smurphy1D

Are units for all rate constants M/s? And what does it mean if the s has a -1 attached in the denominator?

smurphy1D

In the Arrhenious Equation, the Ea being on the top, if it is larger or in absence of a catalyst, would A be larger or smaller than one with a catalyst?

smurphy1D

Does adsorbtion only occur for heterogeneous catalysts?

smurphy1D

if it is zero order then it is constant because anything to the 0 power is just 1

smurphy1D

By looking at the rate law, a 0 order equation with be the simplest looking [A]= -kt + [A]. The first order equation always has ln before [A] so , ln[A]= -kt + ln[A]. Finally 2nd order has [A] in a fraction over 1, so 1/[A]= kt + 1/[A].

smurphy1D

Quarter life of a reaction would be essentially the same as a half life, but anywhere you would put 1/2 in the equation would be replaced with 1/4

smurphy1D

For graphs, we should just know the relationship between what order the reaction is with what goes on the x axis, as well as the direction of the slope on the graph and whether k is positive or negative.

smurphy1D

We should know the 0, 1st, and 2nd rate laws, their rates in relation to k, what the graph and slope looks like, and most likely the half life equations.

smurphy1D

i think an elementary reaction would be something such as 2A + B yeilds 4C, and given a simple rate for one of the products such as .5 M/s of A, knowing that for every 2 A being consumed, there is a x amount of C being produced, and using the rate given to find the rate of product.

smurphy1D

Saturation of an enzyme meas that all of the active sites of the enzymes have been occupied, so once this limit is reached, there can be further increase of reaction rate, it has reached its peak.

smurphy1D

If all of the reactions in the table represent reductions, for the oxidizing half reaction, it would be made negative, then would the sign in the Ecat-Eanode change to addition or would we subtract it?

smurphy1D

If it says the nanostructure is made up of 64 molecules all aligned in the same direction, would W just be 64?
For part b it says they can be in any one of four orientations would n be 4 and W would be 2^4?

smurphy1D

What is the difference between delta S and delta S with the dregrees symbol? Is it degrees celsius or kelvin?

smurphy1D

Hi to whoever sees this, I was unable to attend lecture today due to a family situation and I wanted to see if anyone is willing to share their notes with me via email. It would be greatly appreciated! My email is smurphy2021@g.ucla.edu

smurphy1D

How would I solve for entropy change when i am only given the moles and two temperature calculations? Pressure and volume are assumed to be constant. I have converted them to K and found the delta T, but I am not sure what to do next.

smurphy1D

Delta H is positive because heat is being added in order to melt the ice

smurphy1D

U is the measurement of the random movement of molecules inside of a system

smurphy1D

Delta V equals 0 in closed or isolated systems

smurphy1D

Since the equation involving the derivative can be worked out to a much easier equation, under what instance is it necessary that we actually have to use it?

smurphy1D

Is pressure always Constant in a closed system? Is pressure constant in an open system too?

smurphy1D

Would irreversible reactions occur in open containers then? If the pressure is constant is it always a irreversible reaction?

smurphy1D

Is Delta U always equal to Delta H?

smurphy1D

In order to use the bond enthalpies method, is it necessary to write out the lewis structures of each compound?

smurphy1D

Yes some phase changes are exothermic, as long as it is releasing heat.

smurphy1D

Are the equations we add together ones we have to put together ourselves or will they usually be given?

smurphy1D

For all phase change equations, do we always subtract the end phase by the beginning phase stat, just like we would do in equilibrium equations?

smurphy1D

If the reaction is favoring a forward reaction, in the ice box, would the reactant side of the reaction that gives a negative 'x' and the products would be gaining a 'x' value?

smurphy1D

Is R a constant in every equation? Or does it differ depending on the chemical equation ?

smurphy1D

If we want to use approximation do we have to find the percentage of certainty every time or only it it asks for it?

smurphy1D

when trying to find the pH or poH of something, do We take the - log of the opposite concentration of the one we are trying to find?

smurphy1D

Renee Grange 1I wrote:I think the reason you are getting the wrong answer is because you are using 1.8 bar instead of 1.18 bar, but your steps are correct.

Yes, got it thank you!

smurphy1D

For the ICE tables , if the product side has 2 moles that are both the reactants combined, would the x value be 2x because its doubling in moles?

smurphy1D

How do you incorporate the temperature into a Kw=[H3O+][OH-] equation?

smurphy1D

In this equation I am given the value of K and 2 partial pressure values. I need to solve to find the P for the last one. I am dividing and multiplying the other values around to solve for x but I keep getting the wrong answer. Am I forgetting a step? Ppcl5= Ppcl3 + Pcl2 1.8 bar =(x) + 5.43 bar K=25...

smurphy1D

when the valve is an intermediate valve, neither product or reactant is strongly favored. You can refer to them as slightly favoring one of the other.

smurphy1D

If liquids and solids cant be used to determine k then why can aqueous solutions be used? If aqueous solutions are liquid as well?

smurphy1D

It is at dynamic equilibrium when the rate of the forward reaction is equal to the rate of the reverse reaction

smurphy1D

What is the difference between Q and K?

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