CHEMISTRY COMMUNITY

Magdalena Palavecino 1A

I had the same question, and I was also wondering if the solutions made a mistake when it wrote down that K was 3130 and it actually meant 310 K. Thank you!

Magdalena Palavecino 1A

In this equation you cancel out A, but if you didn't what is A and what do you plug into the equation for it?

Magdalena Palavecino 1A

I think that when you look at K it is K = k/k', but when you are looking at ln then it is ln(k'/k)

Magdalena Palavecino 1A

If the catalyst is the solid in the reaction and the reaction occurs in the surface of the solid, can it be assumed that the catalyst is the excess substance in the reaction? Or will this not always be the case?

Magdalena Palavecino 1A

It is also important to note that the slopes of these graphs will be either -k or k

Magdalena Palavecino 1A

There was a question in which the answer was in mmol. I guess this is ok as long as what you are solving for maintains the units you used.

Magdalena Palavecino 1A

How would we take into account temperature and activation energy when calculating k? Also, I'm confused about all the meanings we have given K in this class. Is k here the rate or the equilibrium constant?

Magdalena Palavecino 1A

All you have to do to change and correct your answer if find the rate PER mole

Magdalena Palavecino 1A

Does the y=mx+b form refer to anything else than the graphs we looked at in class?

Magdalena Palavecino 1A

Does this mean that even if all the stoichiometric coefficients were different, because of the concentrations of each species then all rates would be the same? And does unique rate refer to the equality of all rates or of one species only?

Magdalena Palavecino 1A

The order of each individual reactant or product serves to solve for the reactions used in class. But I don't see what the overall order would be used for.

Magdalena Palavecino 1A

When you say it includes both entropy and enthalpy are you saying that because when one calculates Gibbs free energy you use both in the equation? Would both of the values used be referring to the activation energy?

Magdalena Palavecino 1A

If the amount of energy that is needed to make a reaction happen is small, then no matter how much you raise temperature, the reaction will occur regardless because it only needs a small increase in order to occur.

Magdalena Palavecino 1A

Diamond turns into graphite spontaneously, but that does not mean it occurs fast. In fact, it happens very very slowly, for kinetics rather than thermodynamics is controlling this reaction. The diamond is kinetically stable with respect to graphite, yet thermodynamically unstable.

Magdalena Palavecino 1A

I understand why in class we were told that since the concentration of the reactants decreases, then a negative sign is placed in front of the equation so that the resulting answer is positive. However, why not keep it in order to have it be an indicator that the species is in fact a reactant? If th...

Magdalena Palavecino 1A

How would the charges of each side be balanced using a porous disk? Also, a single line in the shorthand equation serves as a porous disk too instead of two lines signifying a salt bridge, and when the reactants and products of one half equation are in the same state you separate them by a comma.

Magdalena Palavecino 1A

How I usually do it is that I use the simple reduction and oxidation reactions and once I have those down into one overall reaction, I balance the charges adding H protons, and balance the H and Os adding water.

Magdalena Palavecino 1A

I understand that all values are for standard reduction potentials, but when using the Ecell=Ecathode-Eanode we plug in both values for the reduction potential of the equations from the anode and cathode even when we know the reaction at the anode is actually the reverse reaction since it is actuall...

Magdalena Palavecino 1A

So no work is done but there still is a change in internal energy due to the change in volume?

Magdalena Palavecino 1A

Will the problem always say that the reaction is isothermal? Or will it not always be the case and how does this change your way of approaching the problem?

Magdalena Palavecino 1A

I have seen some problems in which W also sometimes is calculated using Avogadro's number. When would this be the case instead of doing 2^molecules in the system?

Magdalena Palavecino 1A

Is it correct to think that in a reversible expansion, the deltaStotal would be zero, and that in an irreversible expansion the deltaSsurrounding would be zero?

Magdalena Palavecino 1A

Also, an easy way to remember that it is bomb calorimeter is that since the volume does not change, pressure builds up inside against the constant volume!

Magdalena Palavecino 1A

So according to the law, disorder increases until equilibrium is reached? So disorder does not always increase?

Magdalena Palavecino 1A

Hi! I guess the lunchbox, if it is completely sealed and no matter was taken from its inside it could be isolated? As long as no matter and energy are lost then it would be.

Magdalena Palavecino 1A

Can someone explain why the solution manual states that the average kinetic energy expression is 3/2RT, when the constants sheet states nRT? Can we assume this is an ideal gas and that there is only one mol so it matches up with the J/mol?

Magdalena Palavecino 1A

How does calculating limiting reactant impact this problem?

Magdalena Palavecino 1A

In the previous explanation for this question, how is the ZnCl2 separated? Should we say they are separated into their ionized versions and calculate the enthalpies of each? Isn't the product ZnCl2 and we should use bond enthalpies of two ZnCl bonds? And how is the enthalpy of formation of 2Cl somet...

Magdalena Palavecino 1A

Did you use an equation provided by the equations sheet? OR can we also think about this logically? I am finding it really hard to think about what to subtract or add from something else with the way things are worded.

Magdalena Palavecino 1A

Does it matter if we are talking about work or heat? I understand that when heat is lost it is negative, but what about work? I am confused about these two terms

Magdalena Palavecino 1A

Can someone please clarify the difference between deltaU and deltaH and how they relate to each other in the equation deltaU = deltaH-pdeltaV

Magdalena Palavecino 1A

We can also think about state properties in the way Dr Lavelle showed us in class with the mountain image. In class, the path the hikers took to get from point A to B did not matter, which is what the rest was saying about the initial and final points.

Magdalena Palavecino 1A

Do you think we will be asked to pdo problems in which the delta Hs refer to supercooling and superheating problems? Would they be solved the same way or do some specific rules apply?

Magdalena Palavecino 1A

Adding to what everyone else has said and like someone said, it is also important to see how these terms refer to a reaction. If the reaction is exothermic, you are releasing heat, meaning that on the products side of your reaction you could add heat. Meanwhile, if the reaction is endothermic, you a...

Magdalena Palavecino 1A

How do you go about solving the problem (a) is you only have Kb of NH3 and it is on the products side? Are you supposed to solve for Ka or should you keep Kb and work to the other side?

Magdalena Palavecino 1A

Can someone please explain how to do this problem? I've been trying to do it for over thirty minutes now.

Magdalena Palavecino 1A

Can someone please explain what method we are supposed to use to solve 41?

Magdalena Palavecino 1A

Hi! I was doing questions 31 and 33 from chapter 11 and run into some controversy. While the answer for 31 says that if Q is less than K then more products will be formed, the answer to 33 says that if Q is greater than K then more product will be formed too. Is this a problem with the answers?

Magdalena Palavecino 1A

Hi, can someone please explain how to solve for questions b and c of this question? Why is b) a mono or bidentate when there are so many free electron pairs, and why in is it a monodentate in part c) if there are also multiple free electron pairs that could form bonds?

Magdalena Palavecino 1A

Hi, can someone please go through what bonds of the molecule one should look at to determine coordination compounds for these molecules? I was tried to do it by free electron pairs but I can't get the right answers.

Magdalena Palavecino 1A

I read the previous answer to this question, but in the answers it places both electron lone pairs on the same side of the Iodine central atom, not on opposite sides. Is this because the answer booklet placed the electrons arbitrarily? Or because they actually do go on one side of the Iodine.

Magdalena Palavecino 1A

I don't understand why the Iodine chain would be linear if there are two lone pairs bonded to the central atom. Shouldn't it be bent/angular instead of linear?

Magdalena Palavecino 1A

Should we be able to know the conversion from eV to Joules for the midterm?

Magdalena Palavecino 1A

I know that the En equation to determine the energy of an H-atom changing energy levels only works for Hydrogen because it only has one electron, but how would its energy amounts compare to another element, like for example, potassium? I know that since there are more electrons you would need to tak...

Magdalena Palavecino 1A

So does this mean that the +/- signs are relative to each other? And also, when you draw a pair of electrons of a lone electron, do you by convention draw then up or does it not matter meaning you could draw them pointing down?

Magdalena Palavecino 1A

When do you know if you should be using the n-1 equation for l of that s= n=0; p= l=1; etc.? I am really confused because I understand the material but then always get the values wrong when it comes to l because I don't know when to use the equation or the set l values that correspond to n levels.

Magdalena Palavecino 1A

I am having trouble understanding the math questions that we could be asked in the test that could have to do with this concept. I understand the idea, but we have never seen it in class. Will we need to use it in the test?

Magdalena Palavecino 1A

I had the same exact question. I was unsure of how to apply the equation for math problems and did not understand how we were going to be asked this in the test. I am guessing the questions about it will be like the conceptual questions we had on the past two tests.

Magdalena Palavecino 1A

When do we use 1/2mv2 for Ek and when do we use de broglies equation for Ek?

Magdalena Palavecino 1A

When do we use 1/2mv2 for Ek and when do we use de broglies equation for Ek?

Magdalena Palavecino 1A

Can someone please explain the Stephan-Boltzmann law? I am having a hard time understanding how to use it and what it is supposed to tell us.

Magdalena Palavecino 1A

Can someone explain the theory behind these equations? I don't understand what the photon energy is used to represent or what chemistry theories are represented.

Magdalena Palavecino 1A

If we are converting a number like 0.0380 to scientific notation, we do need to include the last zero in the sense that we'd have to write it as 3.80 x 10^2 right?

Magdalena Palavecino 1A

Can someone please clarify the definition or difference between an intensive and extensive property regarding chemistry? I do not understand what they are supposed to reflect.

Search found 54 matches