CHEMISTRY COMMUNITY

Ethan Vuong 3G

I think that we will be given a chart and then we combine some of them to form this single product reaction.

Ethan Vuong 3G

Yes you can!

Ethan Vuong 3G

I believe that you use divide concentration over time, but remember to balance the equation!

Ethan Vuong 3G

Hey for the concentration cells, is there just a porous disk because there are the same components for the reactant and product?

Ethan Vuong 3G

What exactly is adsorption, I see that it says when reactants sit on the surface of the catalyst, but what does this mean?

Ethan Vuong 3G

Can someone describe the difference between a heterogeneous and homogeneous catalyst?

Ethan Vuong 3G

Can someone explain to me why during multistep reactions, when we add them we multiply the constants?

Ethan Vuong 3G

I was confused as to why it is a zero order if the substance is independent of k, and what exactly it means by independent.

Ethan Vuong 3G

Just generally, since each half life equation is different depending on which order it is in, are they essentially the same thing but based off of their respective rate laws?

Ethan Vuong 3G

Hi so in my discussion this week, we talked about how first order graph is directly proportional. I'm a little confused to how or why this is, so can someone explain to me why this is directly proportional, and what zeroth order and second order reactions would be?

Ethan Vuong 3G

You use the periodic table and count the number of electrons needed to gain or lose to be the same as the noble gases.

Ethan Vuong 3G

So I am not completely sure, but I think you have to get the half reactions and balance them, then multiply those by a factor that results in the same number of electrons in both half reactions. Then we add the half reactions and cancel out the electrons and that should give the balanced redox react...

Ethan Vuong 3G

So are oxidation agents different from what is being oxidized? I'm confused as to what the terminology is referring to.

Ethan Vuong 3G

Is it only for half reactions that E stays the same when being balanced since it is an intensive property?

Ethan Vuong 3G

I know that the one with the lower concentration would be the product, and the one with the higher concentration would be the reactant, but can someone please explain why that is? I thought the product would have a high concentration?

Ethan Vuong 3G

Is Q essentially the same thing as K but when the equation is not in equilibrium?

Ethan Vuong 3G

Good question. I don't think so since it is in a vacuum and there is no change in temperature.

Ethan Vuong 3G

Since you are looking for the specific heat capacity, you wouldn't be solving for q, but for Ccal. Therefore, you would divide q by delta T. I am unsure of where the negative comes from though.

Ethan Vuong 3G

How does whether it is standard state or not affect the change in enthalpy or entropy? What is its significance?

Ethan Vuong 3G

I believe that you can have a spontaneous endothermic such as melting ice.

Ethan Vuong 3G

Calculate deltaG by using standard enthalpy of formation and standard entropy values of R and P. So delta G =deltaH-Tdelta S.

Ethan Vuong 3G

So is it essentially if the value of delta S or delta H is positive then it is not favorable, but if it is negative, then it is favorable? Can someone please clarify this for me?

Ethan Vuong 3G

so in the situation that it is at equilibrium, is w reversible then? Is the reversible just the negative of the maximum?

Ethan Vuong 3G

Yeah so the entropy of gas molecules are much larger than that of liquid and solid molecules. Would zero gravity make it seem more gas like? I feel like for water to be more gas like, there has to be some vaporization, but that would just be a phase change and that would affect the entropy.

Ethan Vuong 3G

Hi I am confused as to why the microstates of different distributions are important to calculating w. Does this relate to using log properties?

Ethan Vuong 3G

Can someone please explain to me why the table of bond enthalpies refers to the break in bonds for gases. Also, why do we need to add enthalpy of phase changes for liquids and solids?

Ethan Vuong 3G

I think this has to do something with the fact that as the volume gets larger, there will be more work to push the air.

Ethan Vuong 3G

I was also wondering about this. In class, I believe that Dr. Lavelle told us that the most common ones were C(s),N2(g),O2(g),F2(g),Cl2(g),Br2(l),and I2(s). Are these the only ones we would encounter in tests? If not, how do we determine whether it is in standard state or not?

Ethan Vuong 3G

Yes! You just add the energy required with the energy released, but the released energy would have a negative value. So its the energy required minus energy released.

Ethan Vuong 3G

When bonds are formed, energy gets released. This results in a negative enthalpy, deltaH. If it is negative, then it is exothermic.

Ethan Vuong 3G

So I understand that qp is essentially delta h and that is enthalpy, but for notation, is there going to be any instances when we would use qp?

Ethan Vuong 3G

So this is what I have come to understand. Hypochlorous Acid is an example of an oxoacid; so the chlorine is an electron withdrawing atom making the oxygen more likely to lost the H+ to be more stable.

Ethan Vuong 3G

The 5% rule basically states that if x is less than 5% of the initial, then you can approximate it to be the same thing.

Ethan Vuong 3G

So I know that most of the time these reactions will occur in a lab that is 25 degrees Celsius, but what would we do to compensate if it is not in 25 degrees? What would we need to change?

Ethan Vuong 3G

It is considered a weak acid because it has a short bond length between the fluorine and the hydrogen ion. This means there is more energy holding them together and less acidic.

Ethan Vuong 3G

from my understanding, it is amphoteric if you can draw a diagonal on the periodic table from a nonmetal to a metal, or a metal to a nonmetal.

Ethan Vuong 3G

Yeah so HCl should be more acidic because it has a larger radius, therefore increasing the bond length between Cl and the H ion. This decreases the energy that it has, which makes it more stable. The more stable, the more acidic.

Ethan Vuong 3G

Depending on the molarity of the H ions, I believe it is possible to measure a negative pH, but it is not typically seen when determining acidity.

Ethan Vuong 3G

if we are given an equilibrium constant on a question, is that a good indicator that we are calculating a weak base or acid and therefore eliminate the x?

Ethan Vuong 3G

I heard that there was an alternate method so calculating pH and pOH instead of using the ICE tables where we find the square root of Ka or Kb multiplied by the concentration. Is this a valid method?

Ethan Vuong 3G

Hi, during the final, what are some easy tricks that we can use to determine whether the acid or base is strong or weak? Also, can someone explain why when ions get larger, it becomes more acidic?

Ethan Vuong 3G

Can someone confirm my thought process about this? So sigma bonds have electron density with symmetry around the internuclear axis like a single stick which allows it to rotate, but pi bonds are an addition on the side of the internuclear axis which prevents rotation right? Is it due to the face tha...

Ethan Vuong 3G

Essentially, in a single bond, there is going to be a sigma bond. A double bond has a sigma bond and a pi bond. That pi bond prevents rotation. A triple bond has a sigma bond and two pi bonds. I dont believe that there can be two sigma bonds together.

Ethan Vuong 3G

Hi, Im really confused with hybridization right now. I understood it during lecture, but I am lost now. Can someone explain to me a simple way to find the hybrid orbitals. Is it just based of the electrons being shared, or all the electrons including lone pairs?

Ethan Vuong 3G

What I do is I add up all of the exponents (sp=2, sp^2=3,etc.). The sum I relate to the molecular structures so 2 would be linear, 4 is tetrahedral, etc.

hope this kinda helps. i know its a bad explanation.

Ethan Vuong 3G

Hi, so i was reviewing my notes and I saw "internuclear axis". I was wondering what that was. Is it just the area where electrons are being shared? Can someone please clarify this for me? Thanks!

Ethan Vuong 3G

I believe that the charges relate to the electrons in the atom. Since we were learning about multi-electron atoms, I think the distance is the distance between the electrons.

Ethan Vuong 3G

In the equations sheet the rydberg equation is -hR/n^2 but i know that people have been using a different formula. I was wondering how they had this new "derived" formula that contains frequency. Thanks!

Ethan Vuong 3G

Can someone help me understand how electrons passing through crystals also show diffraction? And how does that prove that elections must have wave-like properties?

Ethan Vuong 3G

How does one determine whether emission is in part of the balmer series or lyman series? I know that the visible region is associated with the balmer series and the ultraviolet region associates the lyman series, but how do we determine the energy value?

Ethan Vuong 3G

Hi, so I was confused on the differences between extensive and intensive properties. I wrote down that it has something to do with size, but im still confused. Can someone help me please? Thanks! Also does anyone know good supplemental videos or lessons that can help me review high school chem, sinc...

Search found 51 matches