CHEMISTRY COMMUNITY

Bianca Barcelo 4I

Will reversible expansion always do more work?

Bianca Barcelo 4I

If a system is at equilibrium does that mean it is reversible? If so, in what ways is it reversible?

Bianca Barcelo 4I

Hi, I was wondering how I would use the second-order reaction (after I found k by using the half-life equation)?

Bianca Barcelo 4I

Hi, can someone help me figure out how to do part c and d?

Bianca Barcelo 4I

What value would you use for O2 when writing the unique reaction rate?

Bianca Barcelo 4I

Also, how can I show that the concentration of C is independent of the rate.

Bianca Barcelo 4I

What does it mean for the concentration of C do be independent of the rate? How

Bianca Barcelo 4I

How does the reaction order affect the units of rate laws?

Bianca Barcelo 4I

Why does increasing the temperature of an exothermic reaction favor reactions and an endothermic reaction favor the products?

Bianca Barcelo 4I

So you can use Au(s) -> Au3+ 3e- as a half-reaction, even though both of these species are on the product side?

Bianca Barcelo 4I

What does the standard cell potential qualitatively tell us?

Bianca Barcelo 4I

fgalasso1b wrote:Yes, it's called a disproportionation reaction (when an element is both being oxidized and reduced).

Will this be included in Test 2?

Bianca Barcelo 4I

I am getting confused with when species can act both as oxidizing and reducing agents. What are the general guidelines when dealing with species acting as both in basic solutions?

Bianca Barcelo 4I

How can a species act as both an oxidizing and reducing agent?

Bianca Barcelo 4I

What are some general guidelines or rules to follow when balancing redox reactions?

Bianca Barcelo 4I

Can someone help with balancing the redox equation?

Bianca Barcelo 4I

How/why does reversible expansion do the most work?

Bianca Barcelo 4I

How does irreversible and reversible expansion work? What is happening conceptually with the gas and when is pressure constant?

Bianca Barcelo 4I

I am not sure how to answer the last question,
e.) Explain any differences in pH on the basis of molecular structure.

Bianca Barcelo 4I

In the lecture notes, there was an example where: given .030 M of Ba(OH)2 at 25 C, what are the molarities of H30+ and OH-? After finding the concentration of OH- we were able to find the molarity of H30+ by dividing the Kw (1.0x10^-14) by the concentration of OH- (.060).

Bianca Barcelo 4I

In what situations can we use the equilibrium constant for the autoprotolysis of water? For example, can we assume the application of the constant for strong acids and bases?

Bianca Barcelo 4I

How does having a non-constant/constant pressure affect the way in which a gas reversibly or irreversibly expands? I am just confused conceptually with how pressure affects the gas.

Bianca Barcelo 4I

What exactly is reversible expansion? Also, how would you calculate the work of a gas that is reversibly expanding?

Bianca Barcelo 4I

The internal energy (U) = heat + work (q+w). You would have to use the work equation (w=-P(deltaV)). So you would have to change the pressure from torr to atm and then find the change in volume from the given information. After getting the value of work, you would have to change that to Joules so us...

Bianca Barcelo 4I

What does heat capacity exactly tell us qualitatively?

Bianca Barcelo 4I

Can someone clarify how to use bond enthalpy to calculate the enthalpy change?

Bianca Barcelo 4I

I am not really too sure how to solve this problem? Does anyone have any suggestions?

Bianca Barcelo 4I

How can we tell from Ka and Kb that the acid/base is strong or weak?

Bianca Barcelo 4I

How does endothermic and exothermic reactions affect the way a reaction will shift to (which side does it favor)?

Bianca Barcelo 4I

How does equilibrium change when there are changes in volume?

Bianca Barcelo 4I

When comparing Q and K, what does that exactly tell us?

Bianca Barcelo 4I

What are spectator ions and why are they not included when writing the equilibrium expression?

Bianca Barcelo 4I

Will increasing the pressure for gases affect the equilibrium constant?

Bianca Barcelo 4I

Will increasing the pressure for gases affect the equilibrium constant?

Bianca Barcelo 4I

Can someone explain how the equilibrium partial pressure of gases makes K unitless?

Bianca Barcelo 4I

How can we tell if acids or bases are amphiprotic and/or amphoteric?

Bianca Barcelo 4I

What does it mean to have polar bonds?

Bianca Barcelo 4I

How are bond lengths the same due to resonance structures?

Bianca Barcelo 4I

Why is that higher wavelengths travel faster in comparison to smaller wavelengths?

Bianca Barcelo 4I

What exactly is a conjugate acid and base?

Bianca Barcelo 4I

I believe that it is just a naming convention that we have to follow. For any negatively charged complex, we would have to add -ate to the metal.

Bianca Barcelo 4I

To tell if something is a chelate, I believe you would look at how the ligand has two binding sites to the transition metal.

Bianca Barcelo 4I

What is exactly a conjugate acid and base? What role does it play in a chemical equilibrium equation?

Bianca Barcelo 4I

For this week's homework, are we basing it off of outline 5?

Bianca Barcelo 4I

Why does the bond angle between two hybrid orbitals increase as the s-character of the hybrids is increased? (This question was from 4.43, 6th edition)

Bianca Barcelo 4I

Is there a difference in strength between a sigma bond and pi bonds?

Bianca Barcelo 4I

What is the correct notation when including a d orbital into hybridization? In lecture, for example, I believe d^2sp^3 was used as an example. Can we still put the d orbital after sp?

Bianca Barcelo 4I

Meigan Wu 3I wrote:Also, sigma bonds are made from hybridized orbitals and pi bonds are made from unhybridized orbitals.

What happens when a d orbital is involved in hybridization? Does that affect the shape in any way?

Bianca Barcelo 4I

What are the purposes of sigma and pi bonds? Do they just create a bigger area for electron movement?

Bianca Barcelo 4I

Does this lead to the formation of pi and sigma bonds?

Bianca Barcelo 4I

Soyoung Park 1H wrote:Does hybridization relate to AX2 and AX3? What do these mean??

I believe those are notations related to the VSEPR formula.

Bianca Barcelo 4I

When creating the VSPER model, do the bonds or lone pairs take take precedence over the other?

Bianca Barcelo 4I

Can someone clarify lattice energy?

Bianca Barcelo 4I

Is there a trend based on the size of an atom that correlates to its polarizability/polarizing power?

Bianca Barcelo 4I

What exactly is a metallic bond?

Bianca Barcelo 4I

"In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line." Hi, I am not sure how to solve for the initial and final energ...

Bianca Barcelo 4I

Will we be expected to know how to draw complex compounds for the midterm (e.g., H2C(NH2)COOH, aka Glycine)? This specific compound showed up on 3.41 from the 6th edition?

Bianca Barcelo 4I

What exactly is a nodal plane?

Bianca Barcelo 4I

Hi, I was wondering what were the exceptions to electron affinity that we had to know?

Bianca Barcelo 4I

Hi, I was wondering if we keep all of our digits during multiple step calculations, and then we actually apply significant figures at the very end?

Bianca Barcelo 4I

Can someone give an example of an electron configuration involving the f-orbital? I am confused when we start to use this orbital in terms of the configuration.

Bianca Barcelo 4I

I recommend also going to the peer learning sessions in which the UA has worksheets to prepare for the test. If you can't make it to those ones, I believe they post it on chemistry community, so you can try using those worksheets for practice as well.

Bianca Barcelo 4I

I suggest talking to your counselor as well, but I did have a friend who did take them simultaneously and said it was manageable for the most part. She said some topics overlap. However, overall I think it depends on you.

Bianca Barcelo 4I

Do transition elements act differently in terms of the periodic trends?

Bianca Barcelo 4I

Are there other exceptions to ionization energy (e.g., hydrogen)?

Bianca Barcelo 4I

Does anyone know when we are suppose to do problems from chapter 2?

Bianca Barcelo 4I

For clarification, would this just show a change in energy levels of the electron?

Bianca Barcelo 4I

Can anyone clarify the meaning/concept of quantum number m?

Bianca Barcelo 4I

sonalivij wrote:Objects larger than that typically don't have wavelike properties because their momentum and mass are far too large.

Also to elaborate, from the lecture, "All matter has wavelike properties but only noticed for moving objects with extremely small mass (like e-)"

Bianca Barcelo 4I

Does anyone know when to use the Rydberg constant?

Bianca Barcelo 4I

Can someone clarify the concept of the De Brogile equation?

Bianca Barcelo 4I

For these types of values involving leading zeros behind a decimal, (e.g., .041), would you disregard the 0 as a significant figure?

Bianca Barcelo 4I

jonathanjchang3H wrote:I'm pretty sure the Audio-Visual Focus-Topics, Assessments & Surveys do not affect our grades. They're just supplemental questions and videos to assist with the coursework.

Yea, its no way linked to our grades, and I believe that you appear anonymous when you do the modules.

Bianca Barcelo 4I

Hi Cecilia, for the readings for Chem, I am reading based on what the lectures are going to be about. For example, you can look at the lecture outlines he provided online. I am guessing that the lecture outline #1 is for week one and so on. The lecture outlines also have the chapters that are found...

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