CHEMISTRY COMMUNITY

Muskaan Abdul-Sattar

Yup! It would be 25 degrees C in that case.

Muskaan Abdul-Sattar

A catalyst would just lower the activation energy of a reaction.

Muskaan Abdul-Sattar

It would be 298K so SATP!

Muskaan Abdul-Sattar

So, both are constants but K will only be equal to Q when the reaction is at equilibrium. This is because Q can be the constant at any point, but K has to be the constant at equilibrium.

Muskaan Abdul-Sattar

Salt bridges help to prevent the buildup of charges by allowing for the transfer of electrons.

Muskaan Abdul-Sattar

As other people said, the galvanic cell operates with two different compounds and an oxidation/reduction reaction. A concentration cell would be the same compound and flow due to a concentration gradient.

Muskaan Abdul-Sattar

Typically, to determine what value of R to use, you look at the units being used. In this scenario, R would equal 8.314 J/(Kmol)!

Muskaan Abdul-Sattar

E naught is equal to 0 at equilibrium.

Muskaan Abdul-Sattar

Salt bridges help to prevent the build-up of charges on either side by allowing the transfer of electrons.

Muskaan Abdul-Sattar

Collision theory basically states that in order for gas particles to interact with one another they collide. With increasing temperatures, there is an increase in chaos and kinetic energy so the rate of the reaction will increase as well.

Muskaan Abdul-Sattar

The rate constant, k, can change due to a change in temperature.

Muskaan Abdul-Sattar

E naught is just the value of E at standard conditions!

Muskaan Abdul-Sattar

ΔH° actually represents ΔH at standard conditions, while ΔH represents the change in enthalpy.

Muskaan Abdul-Sattar

I believe the Van't Hoff equation is most applicable when given two different temperatures and attempting to solve for K at one of the two temperatures. Hope that makes sense!

Muskaan Abdul-Sattar

The equation for half-life, as mentioned in the lecture, would be t1/2=[A]0/2k!

Muskaan Abdul-Sattar

As time proceeds, the instantaneous rate will decrease. It approaches 0 as equilibrium is approached

Muskaan Abdul-Sattar

An isolated system means that energy or matter cannot be changed, however, there may be internal aspects of the system that are affected.

Muskaan Abdul-Sattar

I believe for the purposes of this class we can consider their properties and phase the same.

Muskaan Abdul-Sattar

Yes, it is true. Exothermic reactions will always have a negative delta H and endothermic reactions will always have a positive delta H. This is how you can distinguish between the two!

Muskaan Abdul-Sattar

Yes an increase in temperature will lead to an increase in K because it causes an increase in collisions.

Muskaan Abdul-Sattar

A salt bridge essentially allows for the continuous flow of electrons and prevents the build-up of charges

Muskaan Abdul-Sattar

Yes, for the sapling questions they did want us to list the states of matter in order to get the questions correct!

Muskaan Abdul-Sattar

K when used as a unit is likely referring to Kelvin. But, in problems regarding equilibrium constants, K is the equilibrium constant.

Muskaan Abdul-Sattar

You choose the R-value based on the units you are working with. You would want the units to match up!

Muskaan Abdul-Sattar

Low pressures indicate higher volumes, while higher pressures indicate lower volumes. This is an inverse relationship. With greater volume, there are higher values of entropy!

Muskaan Abdul-Sattar

I think the derivation just helps you to comprehend the equation, but you do not need to know how to do it. Memorizing it is probably your best bet!

Muskaan Abdul-Sattar

For a state function, the path taken does not matter. You look solely at the final and initial values.

Muskaan Abdul-Sattar

The one on sapling under chempendix is also the one I've been referring to. They honestly become a lot easier to recognize after you consistently do practice problems with them!

Muskaan Abdul-Sattar

Inert gases do not react, so it does not cause a shift in the equilibrium of a system.

Muskaan Abdul-Sattar

Kc is basically just a more specific term for K. It helps you distinguish between when you're using Kp or Kc. One is for pressure while the other is for concentration values.

Muskaan Abdul-Sattar

I'm also planning on taking 14BL with 14C. I've heard that's pretty common.

Muskaan Abdul-Sattar

I believe that since K is a ratio, the units cancel out and you are just left with the value!

Muskaan Abdul-Sattar

Yes, you'll find that exothermic reactions will always have a negative delta H while endothermic reactions will always have a positive delta H. This is due to the fact that heat is either being released or absorbed.

Muskaan Abdul-Sattar

Dividing by the amount of L helps you find molarity. If you're given the concentration of something in moles, you want to divide it by L to use molarity when doing your ICE table calculations.

Muskaan Abdul-Sattar

In essence, Le Chatlier's Principle explains that when a system experiences a disturbance it will work to overcome that disturbance and restore the system to a state of equilibrium.

Muskaan Abdul-Sattar

I believe HClO3 would be considered a strong acid.

Muskaan Abdul-Sattar

The total pressure is found by adding up all partial pressures at equilibrium!

Muskaan Abdul-Sattar

I was confused about this too! I think as mentioned in other replies, the best way of going about it is checking to see which side has an initial concentration and which side does not. You can assign a -x to the side that has an initial concentration.

Muskaan Abdul-Sattar

Kc and Kp are more specific versions of K. K on its own is representative of the equilibrium constant. Adding a subscript to it just lets you specify.

Muskaan Abdul-Sattar

This would depend on whether the rxn is exothermic or endothermic. You would be asked in relation to this.

Muskaan Abdul-Sattar

The addition of an inert gas would actually not affect the equilibrium! It doesn't affect the pressure of other gases so long as the volume remains unchanged. Changing the volume would increase/decrease pressure, but simply the addition of the inert gas would have zero effect.

Muskaan Abdul-Sattar

I've heard that memorizing strong acids are your best bet. There aren't too many and it's easy to google a list of them!

Muskaan Abdul-Sattar

R is a constant that is = 8.3144598 J/mol·K

Muskaan Abdul-Sattar

Kaleb Tuliau 3E wrote:Pretty sure that Sapling is mandatory, and will actually be collected midnight of the following Sunday, however, is this the only "homework" due??

Yes, I believe Sapling is the only mandatory homework. Professor Lavelle gives us textbook problems as well but those problems are not graded.

Muskaan Abdul-Sattar

Hey! As Hannah said, I believe Ka is used when dealing with the formation of acids while Kb is used when dealing with the formation of bases.

Muskaan Abdul-Sattar

I think starting with molarity is just the easiest thing to do so that you arent concerned with units later on.

Muskaan Abdul-Sattar

I believe the ICE box is best used on weak acids and bases! However, you can use it on strong acids and bases as well, it would just be a longer process.

Muskaan Abdul-Sattar

Adding heat allows the activation energy to lower, thus resulting in a quicker reaction.

Muskaan Abdul-Sattar

When you add a constant you make the equations equal to one another, however, the absence of that constant would make them proportional instead of equal.

Muskaan Abdul-Sattar

If a reaction favors a certain side, it is creating more reactants going towards that given side.

Muskaan Abdul-Sattar

I believe units of pressure should be in atm.

Muskaan Abdul-Sattar

You should use Kelvin!

Muskaan Abdul-Sattar

I believe a lone pair would go on the carbon, therefore resulting in a bent shape.

Muskaan Abdul-Sattar

Strong acids have weaker bonds (long bonds).

Muskaan Abdul-Sattar

We use latin names for anions!

Muskaan Abdul-Sattar

The ion with the larger radius would be the ion that has a less positive charge, in this case, Fe2+.

Muskaan Abdul-Sattar

Just covalent bonds.

Muskaan Abdul-Sattar

90 degree bond angles!

Muskaan Abdul-Sattar

I would review them! I think knowing the different slopes it could have depending on what kind of acids and bases you mix could be important.

Muskaan Abdul-Sattar

Higher Ka values indicate lower pKa values and lower Ka values indicate higher pKa values if I'm not mistaken.

Muskaan Abdul-Sattar

Amphoteric compounds are characterized by their ability to act as both acids and bases! H2O is a great example.

Muskaan Abdul-Sattar

Atomic radius, electronegativity, and ionization energy are probably important ones to know! There are periodic tables that you can look up online with trends outlined on them.

Muskaan Abdul-Sattar

Atoms to right would have a higher electron affinity.

Muskaan Abdul-Sattar

I believe an ion will have a larger radius the more negative it becomes, while the smaller ions will be more positive. But I think there isn't a guaranteed correlation.

Muskaan Abdul-Sattar

Because CHl3 is larger, it has stronger forces that make it harder to melt.

Muskaan Abdul-Sattar

In order to form a hydrogen bond, there must be hydrogen present!

Muskaan Abdul-Sattar

I feel like doing the UA worksheets really helps me to prepare for the content on the tests!

Muskaan Abdul-Sattar

I think the general rule is to use the number of significant figures that are in the problem you're looking at!

Muskaan Abdul-Sattar

If a compound has higher intermolecular forces then its boiling point will be higher!

Muskaan Abdul-Sattar

Aluminum typically forms 3 bonds, similar to Boron.

Muskaan Abdul-Sattar

It contains both a sigma and pi bond within a double bond so I believe that is why you refer to it as a pi bond.

Muskaan Abdul-Sattar

Yes. A sigma bond is present in a single bond while a double bond has a sigma and pi bond. A triple bond has a sigma and two pi bonds.

Muskaan Abdul-Sattar

Structures with formal charges closest to zero will be the most stable.

Muskaan Abdul-Sattar

No, atoms in 3s do not use the d orbital.

Muskaan Abdul-Sattar

I think you should just be aware of its trend, it increases as you move up and to the right of the periodic table.

Muskaan Abdul-Sattar

Lewis bases donate electrons while the lewis acids will accept them.

Muskaan Abdul-Sattar

Fluorine is highly reactive because it only requires 1 electron to reach stability.

Muskaan Abdul-Sattar

I'd love to join in!

Muskaan Abdul-Sattar

They are found experimentally!

Muskaan Abdul-Sattar

I think we'll receive further details on this in lectures to come!

Muskaan Abdul-Sattar

Hey! I believe that cations have the smallest ionic radius, while anions have the largest.

Muskaan Abdul-Sattar

Ionic is stronger according to my understanding!

Muskaan Abdul-Sattar

The mass of the atoms should be in kilograms because it is the SI unit for mass.

Muskaan Abdul-Sattar

Just keep in mind that electronegativity increases up a group and to the right across a period!

Muskaan Abdul-Sattar

I'm trying to relisten to lectures and work through the textbook problems!

Muskaan Abdul-Sattar

I believe they can be used interchangeably.

Muskaan Abdul-Sattar

I believe that the difference depends on the type of metal being used.

Muskaan Abdul-Sattar

They will both increase across a period and also decrease down a group!

Muskaan Abdul-Sattar

I've heard that covalent bonds are the strongest types of bonds!

Muskaan Abdul-Sattar

I'm pretty sure it just has to do with accuracy and precision according to what I looked up. They use sig figs in physics as well.

Muskaan Abdul-Sattar

I usually don't convert to significant figures until the very end, but I'm not completely sure!

Muskaan Abdul-Sattar

Yes, as the electron goes from high to normal energy I believe a photon is emitted. But since all of the energy will be emitted once it reaches a normal state no more photons should be released.

Muskaan Abdul-Sattar

There is also a trend with the atomic radius! It tends to decrease across a period and then increase down a group.

Muskaan Abdul-Sattar

To my understanding, without the vacuum, the particles would not be controlled and collide with the electrons.

Muskaan Abdul-Sattar

I'm also nervous about not knowing anything from high school chem. I'm hoping the step-up session will prove to be useful!

Muskaan Abdul-Sattar

Is a webcam actually required for our exams???

Muskaan Abdul-Sattar

Hello professor, I posted a question to chemistry community yesterday however I am unsure how to check to see if anyone has replied to it or how to find my original question. I was wondering if you could tell me. Thank you. I've been overwhelmed trying to figure out how to navigate this channel too...

Muskaan Abdul-Sattar

Ke Huang 2G wrote:Do we need to memorize both the name and the symbol of elements for the Periodic Table? Will the Periodic Table on the tests provide us the names?

I don't think we need it memorized, but it will probably be helpful to become familiarized with the Table and know how to interact with it.

Muskaan Abdul-Sattar

Calculate the percent composition by mass of each element in NaClO3. Na= 14.37% Cl= 36.38% O= 49.25% These are my answers for question 5 but it's incorrect. I solved by dividing the molar mass of each element over the molar mass of the whole molecule, then changing it to a percentage, so I don't kn...

Muskaan Abdul-Sattar

t_rasul3I wrote:Can I just join any UA peer learning session?

From my understanding, yes. You can just pop into any session and it's okay if you can't attend for the entire time frame.

Search found 101 matches